Render MR Notes with Vue with behind a cookie

app/assets/javascripts/autosave.js

@@ -3,10 +3,10 @@
 import AccessorUtilities from './lib/utils/accessor';
 
 export default class Autosave {
-  constructor(field, key, resource) {
+  constructor(field, key) {
     this.field = field;
+
     this.isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();
-    this.resource = resource;
     if (key.join != null) {
       key = key.join('/');
     }
@@ -17,31 +17,27 @@ export default class Autosave {
   }
 
   restore() {
-    var text;
-
     if (!this.isLocalStorageAvailable) return;
+    if (!this.field.length) return;
 
-    text = window.localStorage.getItem(this.key);
+    const text = window.localStorage.getItem(this.key);
 
     if ((text != null ? text.length : void 0) > 0) {
       this.field.val(text);
     }
-    if (!this.resource && this.resource !== 'issue') {
+
     this.field.trigger('input');
-    } else {
     // v-model does not update with jQuery trigger
     // https://github.com/vuejs/vue/issues/2804#issuecomment-216968137
     const event = new Event('change', { bubbles: true, cancelable: false });
     const field = this.field.get(0);
-      if (field) {
     field.dispatchEvent(event);
   }
-    }
-  }
 
   save() {
-    var text;
-    text = this.field.val();
+    if (!this.field.length) return;
+
+    const text = this.field.val();
 
     if (this.isLocalStorageAvailable && (text != null ? text.length : void 0) > 0) {
       return window.localStorage.setItem(this.key, text);

app/assets/javascripts/awards_handler.js

@@ -2,7 +2,7 @@
 import _ from 'underscore';
 import Cookies from 'js-cookie';
 import { __ } from './locale';
-import { isInIssuePage, updateTooltipTitle } from './lib/utils/common_utils';
+import { isInIssuePage, isInMRPage, hasVueMRDiscussionsCookie, updateTooltipTitle } from './lib/utils/common_utils';
 import flash from './flash';
 import axios from './lib/utils/axios_utils';
 
@@ -239,9 +239,9 @@ class AwardsHandler {
   }
 
   addAward(votesBlock, awardUrl, emoji, checkMutuality, callback) {
-    const isMainAwardsBlock = votesBlock.closest('.js-issue-note-awards').length;
+    const isMainAwardsBlock = votesBlock.closest('.js-noteable-awards').length;
 
-    if (isInIssuePage() && !isMainAwardsBlock) {
+    if (this.isInVueNoteablePage() && !isMainAwardsBlock) {
       const id = votesBlock.attr('id').replace('note_', '');
 
       this.hideMenuElement($('.emoji-menu'));
@@ -293,8 +293,16 @@ class AwardsHandler {
     }
   }
 
+  isVueMRDiscussions() {
+    return isInMRPage() && hasVueMRDiscussionsCookie() && !$('#diffs').is(':visible');
+  }
+
+  isInVueNoteablePage() {
+    return isInIssuePage() || this.isVueMRDiscussions();
+  }
+
   getVotesBlock() {
-    if (isInIssuePage()) {
+    if (this.isInVueNoteablePage()) {
       const $el = $('.js-add-award.is-active').closest('.note.timeline-entry');
 
       if ($el.length) {

app/assets/javascripts/diff_notes/components/jump_to_discussion.js

@@ -197,7 +197,7 @@ const JumpToDiscussion = Vue.extend({
       }
 
       $.scrollTo($target, {
-        offset: 0
+        offset: -150
       });
     }
   },

app/assets/javascripts/diff_notes/components/resolve_btn.js

@@ -87,6 +87,7 @@ const ResolveBtn = Vue.extend({
           CommentsStore.update(this.discussionId, this.noteId, !this.isResolved, resolved_by);
           this.discussion.updateHeadline(data);
           gl.mrWidget.checkStatus();
+          document.dispatchEvent(new CustomEvent('refreshVueNotes'));
 
           this.updateTooltip();
         })

app/assets/javascripts/diff_notes/diff_notes_bundle.js

@@ -14,6 +14,7 @@ import './components/resolve_count';
 import './components/resolve_discussion_btn';
 import './components/diff_note_avatars';
 import './components/new_issue_for_discussion';
+import { hasVueMRDiscussionsCookie } from '../lib/utils/common_utils';
 
 export default () => {
   const projectPathHolder = document.querySelector('.merge-request') || document.querySelector('.commit-box');
@@ -67,12 +68,14 @@ export default () => {
 
   gl.diffNotesCompileComponents();
 
+  if (!hasVueMRDiscussionsCookie()) {
     new Vue({
       el: '#resolve-count-app',
       components: {
         'resolve-count': ResolveCount
       },
     });
+  }
 
   $(window).trigger('resize.nav');
 };

app/assets/javascripts/diff_notes/services/resolve.js

@@ -8,8 +8,8 @@ window.gl = window.gl || {};
 
 class ResolveServiceClass {
   constructor(root) {
-    this.noteResource = Vue.resource(`${root}/notes{/noteId}/resolve`);
-    this.discussionResource = Vue.resource(`${root}/merge_requests{/mergeRequestId}/discussions{/discussionId}/resolve`);
+    this.noteResource = Vue.resource(`${root}/notes{/noteId}/resolve?html=true`);
+    this.discussionResource = Vue.resource(`${root}/merge_requests{/mergeRequestId}/discussions{/discussionId}/resolve?html=true`);
   }
 
   resolve(noteId) {
@@ -45,6 +45,7 @@ class ResolveServiceClass {
 
         if (gl.mrWidget) gl.mrWidget.checkStatus();
         discussion.updateHeadline(data);
+        document.dispatchEvent(new CustomEvent('refreshVueNotes'));
       })
       .catch(() => new Flash('An error occurred when trying to resolve a discussion. Please try again.'));
   }

app/assets/javascripts/lib/utils/common_utils.js

+import jQuery from 'jquery';
+import Cookies from 'js-cookie';
 import axios from './axios_utils';
 import { getLocationHash } from './url_utility';
 import { convertToCamelCase } from './text_utility';
@@ -22,13 +24,18 @@ export const getGroupSlug = () => {
   return null;
 };
 
-export const isInIssuePage = () => {
-  const page = getPagePath(1);
-  const action = getPagePath(2);
+export const checkPageAndAction = (page, action) => {
+  const pagePath = getPagePath(1);
+  const actionPath = getPagePath(2);
 
-  return page === 'issues' && action === 'show';
+  return pagePath === page && actionPath === action;
 };
 
+export const isInIssuePage = () => checkPageAndAction('issues', 'show');
+export const isInMRPage = () => checkPageAndAction('merge_requests', 'show');
+export const isInNoteablePage = () => isInIssuePage() || isInMRPage();
+export const hasVueMRDiscussionsCookie = () => Cookies.get('vue_mr_discussions');
+
 export const ajaxGet = url => axios.get(url, {
   params: { format: 'js' },
   responseType: 'text',
@@ -133,7 +140,11 @@ export const isMetaKey = e => e.metaKey || e.ctrlKey || e.altKey || e.shiftKey;
 // 3) Middle-click or Mouse Wheel Click (e.which is 2)
 export const isMetaClick = e => e.metaKey || e.ctrlKey || e.which === 2;
 
-export const scrollToElement = ($el) => {
+export const scrollToElement = (element) => {
+  let $el = element;
+  if (!(element instanceof jQuery)) {
+    $el = $(element);
+  }
   const top = $el.offset().top;
   const mrTabsHeight = $('.merge-request-tabs').height() || 0;
   const headerHeight = $('.navbar-gitlab').height() || 0;

app/assets/javascripts/lib/utils/text_utility.js

@@ -65,6 +65,20 @@ export function capitalizeFirstCharacter(text) {
   return `${text[0].toUpperCase()}${text.slice(1)}`;
 }
 
+export function camelCase(str) {
+  return str.replace(/_+([a-z])/gi, ($1, $2) => $2.toUpperCase());
+}
+
+export function camelCaseKeys(obj = {}) {
+  return Object.keys(obj).reduce((acc, key) => {
+    const camelKey = camelCase(key);
+    return {
+      ...acc,
+      [camelKey]: obj[key],
+    };
+  }, {});
+}
+
 /**
  * Replaces all html tags from a string with the given replacement.
  *

app/assets/javascripts/merge_request_tabs.js

@@ -241,6 +241,10 @@ export default class MergeRequestTabs {
     return newState;
   }
 
+  getCurrentAction() {
+    return this.currentAction;
+  }
+
   loadCommits(source) {
     if (this.commitsLoaded) {
       return;

app/assets/javascripts/mr_notes/index.js

+import Vue from 'vue';
+import notesApp from '../notes/components/notes_app.vue';
+import discussionCounter from '../notes/components/discussion_counter.vue';
+import store from '../notes/stores';
+
+document.addEventListener('DOMContentLoaded', () => {
+  new Vue({ // eslint-disable-line
+    el: '#js-vue-mr-discussions',
+    components: {
+      notesApp,
+    },
+    data() {
+      const notesDataset = document.getElementById('js-vue-mr-discussions').dataset;
+      return {
+        noteableData: JSON.parse(notesDataset.noteableData),
+        currentUserData: JSON.parse(notesDataset.currentUserData),
+        notesData: JSON.parse(notesDataset.notesData),
+      };
+    },
+    render(createElement) {
+      return createElement('notes-app', {
+        props: {
+          noteableData: this.noteableData,
+          notesData: this.notesData,
+          userData: this.currentUserData,
+        },
+      });
+    },
+  });
+
+  new Vue({ // eslint-disable-line
+    el: '#js-vue-discussion-counter',
+    components: {
+      discussionCounter,
+    },
+    store,
+    render(createElement) {
+      return createElement('discussion-counter');
+    },
+  });
+});

app/assets/javascripts/notes.js

@@ -24,7 +24,7 @@ import GLForm from './gl_form';
 import loadAwardsHandler from './awards_handler';
 import Autosave from './autosave';
 import TaskList from './task_list';
-import { isInViewport, getPagePath, scrollToElement, isMetaKey } from './lib/utils/common_utils';
+import { isInViewport, getPagePath, scrollToElement, isMetaKey, hasVueMRDiscussionsCookie } from './lib/utils/common_utils';
 import imageDiffHelper from './image_diff/helpers/index';
 import { localTimeAgo } from './lib/utils/datetime_utility';
 
@@ -44,6 +44,10 @@ export default class Notes {
     }
   }
 
+  static getInstance() {
+    return this.instance;
+  }
+
   constructor(notes_url, note_ids, last_fetched_at, view, enableGFM = true) {
     this.updateTargetButtons = this.updateTargetButtons.bind(this);
     this.updateComment = this.updateComment.bind(this);
@@ -102,67 +106,77 @@ export default class Notes {
   }
 
   addBinding() {
+    this.$wrapperEl = hasVueMRDiscussionsCookie() ? $(document).find('.diffs') : $(document);
+
     // Edit note link
-    $(document).on('click', '.js-note-edit', this.showEditForm.bind(this));
-    $(document).on('click', '.note-edit-cancel', this.cancelEdit);
+    this.$wrapperEl.on('click', '.js-note-edit', this.showEditForm.bind(this));
+    this.$wrapperEl.on('click', '.note-edit-cancel', this.cancelEdit);
     // Reopen and close actions for Issue/MR combined with note form submit
-    $(document).on('click', '.js-comment-submit-button', this.postComment);
-    $(document).on('click', '.js-comment-save-button', this.updateComment);
-    $(document).on('keyup input', '.js-note-text', this.updateTargetButtons);
+    this.$wrapperEl.on('click', '.js-comment-submit-button', this.postComment);
+    this.$wrapperEl.on('click', '.js-comment-save-button', this.updateComment);
+    this.$wrapperEl.on('keyup input', '.js-note-text', this.updateTargetButtons);
     // resolve a discussion
-    $(document).on('click', '.js-comment-resolve-button', this.postComment);
+    this.$wrapperEl.on('click', '.js-comment-resolve-button', this.postComment);
     // remove a note (in general)
-    $(document).on('click', '.js-note-delete', this.removeNote);
+    this.$wrapperEl.on('click', '.js-note-delete', this.removeNote);
     // delete note attachment
-    $(document).on('click', '.js-note-attachment-delete', this.removeAttachment);
+    this.$wrapperEl.on('click', '.js-note-attachment-delete', this.removeAttachment);
     // reset main target form when clicking discard
-    $(document).on('click', '.js-note-discard', this.resetMainTargetForm);
+    this.$wrapperEl.on('click', '.js-note-discard', this.resetMainTargetForm);
     // update the file name when an attachment is selected
-    $(document).on('change', '.js-note-attachment-input', this.updateFormAttachment);
+    this.$wrapperEl.on('change', '.js-note-attachment-input', this.updateFormAttachment);
     // reply to diff/discussion notes
-    $(document).on('click', '.js-discussion-reply-button', this.onReplyToDiscussionNote);
+    this.$wrapperEl.on('click', '.js-discussion-reply-button', this.onReplyToDiscussionNote);
     // add diff note
-    $(document).on('click', '.js-add-diff-note-button', this.onAddDiffNote);
+    this.$wrapperEl.on('click', '.js-add-diff-note-button', this.onAddDiffNote);
     // add diff note for images
-    $(document).on('click', '.js-add-image-diff-note-button', this.onAddImageDiffNote);
+    this.$wrapperEl.on('click', '.js-add-image-diff-note-button', this.onAddImageDiffNote);
     // hide diff note form
-    $(document).on('click', '.js-close-discussion-note-form', this.cancelDiscussionForm);
+    this.$wrapperEl.on('click', '.js-close-discussion-note-form', this.cancelDiscussionForm);
     // toggle commit list
-    $(document).on('click', '.system-note-commit-list-toggler', this.toggleCommitList);
+    this.$wrapperEl.on('click', '.system-note-commit-list-toggler', this.toggleCommitList);
     // fetch notes when tab becomes visible
-    $(document).on('visibilitychange', this.visibilityChange);
+    this.$wrapperEl.on('visibilitychange', this.visibilityChange);
     // when issue status changes, we need to refresh data
-    $(document).on('issuable:change', this.refresh);
+    this.$wrapperEl.on('issuable:change', this.refresh);
     // ajax:events that happen on Form when actions like Reopen, Close are performed on Issues and MRs.
-    $(document).on('ajax:success', '.js-main-target-form', this.addNote);
-    $(document).on('ajax:success', '.js-discussion-note-form', this.addDiscussionNote);
-    $(document).on('ajax:success', '.js-main-target-form', this.resetMainTargetForm);
-    $(document).on('ajax:complete', '.js-main-target-form', this.reenableTargetFormSubmitButton);
+    this.$wrapperEl.on('ajax:success', '.js-main-target-form', this.addNote);
+    this.$wrapperEl.on('ajax:success', '.js-discussion-note-form', this.addDiscussionNote);
+    this.$wrapperEl.on('ajax:success', '.js-main-target-form', this.resetMainTargetForm);
+    this.$wrapperEl.on('ajax:complete', '.js-main-target-form', this.reenableTargetFormSubmitButton);
     // when a key is clicked on the notes
-    $(document).on('keydown', '.js-note-text', this.keydownNoteText);
+    this.$wrapperEl.on('keydown', '.js-note-text', this.keydownNoteText);
     // When the URL fragment/hash has changed, `#note_xxx`
-    return $(window).on('hashchange', this.onHashChange);
+    $(window).on('hashchange', this.onHashChange);
+    this.boundGetContent = this.getContent.bind(this);
+    document.addEventListener('refreshLegacyNotes', this.boundGetContent);
+    this.eventsBound = true;
   }
 
   cleanBinding() {
-    $(document).off('click', '.js-note-edit');
-    $(document).off('click', '.note-edit-cancel');
-    $(document).off('click', '.js-note-delete');
-    $(document).off('click', '.js-note-attachment-delete');
-    $(document).off('click', '.js-discussion-reply-button');
-    $(document).off('click', '.js-add-diff-note-button');
-    $(document).off('click', '.js-add-image-diff-note-button');
-    $(document).off('visibilitychange');
-    $(document).off('keyup input', '.js-note-text');
-    $(document).off('click', '.js-note-target-reopen');
-    $(document).off('click', '.js-note-target-close');
-    $(document).off('click', '.js-note-discard');
-    $(document).off('keydown', '.js-note-text');
-    $(document).off('click', '.js-comment-resolve-button');
-    $(document).off('click', '.system-note-commit-list-toggler');
-    $(document).off('ajax:success', '.js-main-target-form');
-    $(document).off('ajax:success', '.js-discussion-note-form');
-    $(document).off('ajax:complete', '.js-main-target-form');
+    if (!this.eventsBound) {
+      return;
+    }
+
+    this.$wrapperEl.off('click', '.js-note-edit');
+    this.$wrapperEl.off('click', '.note-edit-cancel');
+    this.$wrapperEl.off('click', '.js-note-delete');
+    this.$wrapperEl.off('click', '.js-note-attachment-delete');
+    this.$wrapperEl.off('click', '.js-discussion-reply-button');
+    this.$wrapperEl.off('click', '.js-add-diff-note-button');
+    this.$wrapperEl.off('click', '.js-add-image-diff-note-button');
+    this.$wrapperEl.off('visibilitychange');
+    this.$wrapperEl.off('keyup input', '.js-note-text');
+    this.$wrapperEl.off('click', '.js-note-target-reopen');
+    this.$wrapperEl.off('click', '.js-note-target-close');
+    this.$wrapperEl.off('click', '.js-note-discard');
+    this.$wrapperEl.off('keydown', '.js-note-text');
+    this.$wrapperEl.off('click', '.js-comment-resolve-button');
+    this.$wrapperEl.off('click', '.system-note-commit-list-toggler');
+    this.$wrapperEl.off('ajax:success', '.js-main-target-form');
+    this.$wrapperEl.off('ajax:success', '.js-discussion-note-form');
+    this.$wrapperEl.off('ajax:complete', '.js-main-target-form');
+    document.removeEventListener('refreshLegacyNotes', this.boundGetContent);
     $(window).off('hashchange', this.onHashChange);
   }
 
@@ -252,8 +266,10 @@ export default class Notes {
     if (this.refreshing) {
       return;
     }
+
     this.refreshing = true;
-    axios.get(this.notes_url, {
+
+    axios.get(`${this.notes_url}?html=true`, {
       headers: {
         'X-Last-Fetched-At': this.last_fetched_at,
       },
@@ -350,7 +366,7 @@ export default class Notes {
     }
 
     if (!noteEntity.valid) {
-      if (noteEntity.errors.commands_only) {
+      if (noteEntity.errors && noteEntity.errors.commands_only) {
         if (noteEntity.commands_changes &&
             Object.keys(noteEntity.commands_changes).length > 0) {
           $notesList.find('.system-note.being-posted').remove();
@@ -363,6 +379,10 @@ export default class Notes {
 
     const $note = $notesList.find(`#note_${noteEntity.id}`);
     if (Notes.isNewNote(noteEntity, this.note_ids)) {
+      if (hasVueMRDiscussionsCookie()) {
+        return;
+      }
+
       this.note_ids.push(noteEntity.id);
 
       if ($notesList.length) {
@@ -399,6 +419,8 @@ export default class Notes {
         this.setupNewNote($updatedNote);
       }
     }
+
+    Notes.refreshVueNotes();
   }
 
   isParallelView() {
@@ -406,12 +428,11 @@ export default class Notes {
   }
 
   /**
-   * Render note in discussion area.
-   *
-   * Note: for rendering inline notes use renderDiscussionNote
+   * Render note in discussion area. To render inline notes use renderDiscussionNote.
    */
   renderDiscussionNote(noteEntity, $form) {
     var discussionContainer, form, row, lineType, diffAvatarContainer;
+
     if (!Notes.isNewNote(noteEntity, this.note_ids)) {
       return;
     }
@@ -452,8 +473,10 @@ export default class Notes {
       // Init discussion on 'Discussion' page if it is merge request page
       const page = $('body').attr('data-page');
       if ((page && page.indexOf('projects:merge_request') !== -1) || !noteEntity.diff_discussion_html) {
+        if (!hasVueMRDiscussionsCookie()) {
           Notes.animateAppendNote(noteEntity.discussion_html, $('.main-notes-list'));
         }
+      }
     } else {
       // append new note to all matching discussions
       Notes.animateAppendNote(noteEntity.html, discussionContainer);
@@ -634,7 +657,6 @@ export default class Notes {
     var $noteEntityEl, $note_li;
     // Convert returned HTML to a jQuery object so we can modify it further
     $noteEntityEl = $(noteEntity.html);
-    $noteEntityEl.addClass('fade-in-full');
     this.revertNoteEditForm($targetNote);
     $noteEntityEl.renderGFM();
     // Find the note's `li` element by ID and replace it with the updated HTML
@@ -730,7 +752,7 @@ export default class Notes {
     var selector = this.getEditFormSelector($target);
     var $editForm = $(selector);
 
-    $editForm.insertBefore('.notes-form');
+    $editForm.insertBefore('.diffs');
     $editForm.find('.js-comment-save-button').enable();
     $editForm.find('.js-finish-edit-warning').hide();
   }
@@ -746,7 +768,8 @@ export default class Notes {
   }
 
   removeNoteEditForm($note) {
-    var form = $note.find('.current-note-edit-form');
+    var form = $note.find('.diffs .current-note-edit-form');
+
     $note.removeClass('is-editing');
     form.removeClass('current-note-edit-form');
     form.find('.js-finish-edit-warning').hide();
@@ -818,6 +841,7 @@ export default class Notes {
       };
     })(this));
 
+    Notes.refreshVueNotes();
     Notes.checkMergeRequestStatus();
     return this.updateNotesCount(-1);
   }
@@ -1157,7 +1181,7 @@ export default class Notes {
     this.glForm = new GLForm($editForm.find('form'), this.enableGFM);
 
     $editForm.find('form')
-      .attr('action', postUrl)
+      .attr('action', `${postUrl}?html=true`)
       .attr('data-remote', 'true');
     $editForm.find('.js-form-target-id').val(targetId);
     $editForm.find('.js-form-target-type').val(targetType);
@@ -1280,6 +1304,10 @@ export default class Notes {
     return $updatedNote;
   }
 
+  static refreshVueNotes() {
+    document.dispatchEvent(new CustomEvent('refreshVueNotes'));
+  }
+
   /**
    * Get data from Form attributes to use for saving/submitting comment.
    */
@@ -1481,7 +1509,7 @@ export default class Notes {
 
     /* eslint-disable promise/catch-or-return */
     // Make request to submit comment on server
-    axios.post(formAction, formData)
+    axios.post(`${formAction}?html=true`, formData)
       .then((res) => {
         const note = res.data;
 
@@ -1546,6 +1574,8 @@ export default class Notes {
           if ($notesContainer.length) {
             $notesContainer.append('<div class="flash-container" style="display: none;"></div>');
           }
+
+          Notes.refreshVueNotes();
         } else if (isMainForm) { // Check if this was main thread comment
           // Show final note element on UI and perform form and action buttons cleanup
           this.addNote($form, note);
@@ -1627,7 +1657,7 @@ export default class Notes {
 
     /* eslint-disable promise/catch-or-return */
     // Make request to update comment on server
-    axios.post(formAction, formData)
+    axios.post(`${formAction}?html=true`, formData)
       .then(({ data }) => {
         // Submission successful! render final note element
         this.updateNote(data, $editingNote);

app/assets/javascripts/notes/components/comment_form.vue

@@ -2,10 +2,11 @@
   import { mapActions, mapGetters } from 'vuex';
   import _ from 'underscore';
   import Autosize from 'autosize';
-  import { __ } from '~/locale';
+  import { __, sprintf } from '~/locale';
   import Flash from '../../flash';
   import Autosave from '../../autosave';
   import TaskList from '../../task_list';
+  import { capitalizeFirstCharacter, convertToCamelCase } from '../../lib/utils/text_utility';
   import * as constants from '../constants';
   import eventHub from '../event_hub';
   import issueWarning from '../../vue_shared/components/issue/issue_warning.vue';
@@ -29,6 +30,12 @@
     mixins: [
       issuableStateMixin,
     ],
+    props: {
+      noteableType: {
+        type: String,
+        required: true,
+      },
+    },
     data() {
       return {
         note: '',
@@ -43,37 +50,51 @@
         'getUserData',
         'getNoteableData',
         'getNotesData',
-        'issueState',
+        'openState',
       ]),
+      noteableDisplayName() {
+        return this.noteableType.replace(/_/g, ' ');
+      },
       isLoggedIn() {
         return this.getUserData.id;
       },
       commentButtonTitle() {
         return this.noteType === constants.COMMENT ? 'Comment' : 'Start discussion';
       },
-      isIssueOpen() {
-        return this.issueState === constants.OPENED || this.issueState === constants.REOPENED;
+      isOpen() {
+        return this.openState === constants.OPENED || this.openState === constants.REOPENED;
       },
       canCreateNote() {
         return this.getNoteableData.current_user.can_create_note;
       },
       issueActionButtonTitle() {
-        if (this.note.length) {
-          const actionText = this.isIssueOpen ? 'close' : 'reopen';
+        const openOrClose = this.isOpen ? 'close' : 'reopen';
 
-          return this.noteType === constants.COMMENT ?
-            `Comment & ${actionText} issue` :
-            `Start discussion & ${actionText} issue`;
+        if (this.note.length) {
+          return sprintf(
+            __('%{actionText} & %{openOrClose} %{noteable}'),
+            {
+              actionText: this.commentButtonTitle,
+              openOrClose,
+              noteable: this.noteableDisplayName,
+            },
+          );
         }
 
-        return this.isIssueOpen ? 'Close issue' : 'Reopen issue';
+        return sprintf(
+          __('%{openOrClose} %{noteable}'),
+          {
+            openOrClose: capitalizeFirstCharacter(openOrClose),
+            noteable: this.noteableDisplayName,
+          },
+        );
       },
       actionButtonClassNames() {
         return {
-          'btn-reopen': !this.isIssueOpen,
-          'btn-close': this.isIssueOpen,
-          'js-note-target-close': this.isIssueOpen,
-          'js-note-target-reopen': !this.isIssueOpen,
+          'btn-reopen': !this.isOpen,
+          'btn-close': this.isOpen,
+          'js-note-target-close': this.isOpen,
+          'js-note-target-reopen': !this.isOpen,
         };
       },
       markdownDocsPath() {
@@ -138,7 +159,7 @@
             flashContainer: this.$el,
             data: {
               note: {
-                noteable_type: constants.NOTEABLE_TYPE,
+                noteable_type: this.noteableType,
                 noteable_id: this.getNoteableData.id,
                 note: this.note,
               },
@@ -193,19 +214,29 @@ Please check your network connection and try again.`;
         this.isSubmitting = false;
       },
       toggleIssueState() {
-        if (this.isIssueOpen) {
+        if (this.isOpen) {
           this.closeIssue()
             .then(() => this.enableButton())
             .catch(() => {
               this.enableButton();
-              Flash(__('Something went wrong while closing the issue. Please try again later'));
+              Flash(
+                sprintf(
+                  __('Something went wrong while closing the %{issuable}. Please try again later'),
+                  { issuable: this.noteableDisplayName },
+                ),
+              );
             });
         } else {
           this.reopenIssue()
             .then(() => this.enableButton())
             .catch(() => {
               this.enableButton();
-              Flash(__('Something went wrong while reopening the issue. Please try again later'));
+              Flash(
+                sprintf(
+                  __('Something went wrong while reopening the %{issuable}. Please try again later'),
+                  { issuable: this.noteableDisplayName },
+                ),
+              );
             });
         }
       },
@@ -221,7 +252,6 @@ Please check your network connection and try again.`;
           this.$refs.markdownField.previewMarkdown = false;
         }
 
-        // reset autostave
         this.autosave.reset();
       },
       setNoteType(type) {
@@ -240,10 +270,11 @@ Please check your network connection and try again.`;
       },
       initAutoSave() {
         if (this.isLoggedIn) {
+          const noteableType = capitalizeFirstCharacter(convertToCamelCase(this.noteableType));
+
           this.autosave = new Autosave(
             $(this.$refs.textarea),
-            ['Note', 'Issue', this.getNoteableData.id],
-            'issue',
+            ['Note', noteableType, this.getNoteableData.id],
           );
         }
       },
@@ -331,7 +362,7 @@ append-right-10 comment-type-dropdown js-comment-type-dropdown droplab-dropdown"
                     :disabled="isSubmitButtonDisabled"
                     class="btn btn-create comment-btn js-comment-button js-comment-submit-button"
                     type="submit">
-                    {{ commentButtonTitle }}
+                    {{ __(commentButtonTitle) }}
                   </button>
                   <button
                     :disabled="isSubmitButtonDisabled"
@@ -359,7 +390,7 @@ append-right-10 comment-type-dropdown js-comment-type-dropdown droplab-dropdown"
                         <div class="description">
                           <strong>Comment</strong>
                           <p>
-                            Add a general comment to this issue.
+                            Add a general comment to this {{ noteableDisplayName }}.
                           </p>
                         </div>
                       </button>

app/assets/javascripts/notes/components/diff_file_header.vue

+<script>
+  import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
+  import Icon from '~/vue_shared/components/icon.vue';
+
+  export default {
+    components: {
+      ClipboardButton,
+      Icon,
+    },
+    props: {
+      diffFile: {
+        type: Object,
+        required: true,
+      },
+    },
+    computed: {
+      titleTag() {
+        return this.diffFile.discussionPath ? 'a' : 'span';
+      },
+    },
+  };
+</script>
+
+<template>
+  <div class="file-header-content">
+    <div
+      v-if="diffFile.submodule"
+    >
+      <span>
+        <icon name="archive" />
+        <strong
+          v-html="diffFile.submoduleLink"
+          class="file-title-name"
+        ></strong>
+        <clipboard-button
+          title="Copy file path to clipboard"
+          :text="diffFile.submoduleLink"
+        />
+      </span>
+    </div>
+    <template v-else>
+      <component
+        ref="titleWrapper"
+        :is="titleTag"
+        :href="diffFile.discussionPath"
+      >
+        <span v-html="diffFile.blobIcon"></span>
+        <span v-if="diffFile.renamedFile">
+          <strong
+            class="file-title-name has-tooltip"
+            :title="diffFile.oldPath"
+            data-container="body"
+          >
+            {{ diffFile.oldPath }}
+          </strong>
+          &rarr;
+          <strong
+            class="file-title-name has-tooltip"
+            :title="diffFile.newPath"
+            data-container="body"
+          >
+            {{ diffFile.newPath }}
+          </strong>
+        </span>
+
+        <strong
+          v-else
+          class="file-title-name has-tooltip"
+          :title="diffFile.oldPath"
+          data-container="body"
+        >
+          {{ diffFile.filePath }}
+          <span v-if="diffFile.deletedFile">
+            deleted
+          </span>
+        </strong>
+      </component>
+
+      <clipboard-button
+        title="Copy file path to clipboard"
+        :text="diffFile.filePath"
+      />
+
+      <small
+        v-if="diffFile.modeChanged"
+        ref="fileMode"
+      >
+        {{ diffFile.aMode }} → {{ diffFile.bMode }}
+      </small>
+    </template>
+  </div>
+</template>

app/assets/javascripts/notes/components/diff_with_note.vue

+<script>
+  import syntaxHighlight from '~/syntax_highlight';
+  import imageDiffHelper from '~/image_diff/helpers/index';
+  import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
+  import DiffFileHeader from './diff_file_header.vue';
+
+  export default {
+    components: {
+      DiffFileHeader,
+    },
+    props: {
+      discussion: {
+        type: Object,
+        required: true,
+      },
+    },
+    computed: {
+      isImageDiff() {
+        return !this.diffFile.text;
+      },
+      diffFileClass() {
+        const { text } = this.diffFile;
+        return text ? 'text-file' : 'js-image-file';
+      },
+      diffRows() {
+        return $(this.discussion.truncatedDiffLines);
+      },
+      diffFile() {
+        return convertObjectPropsToCamelCase(this.discussion.diffFile);
+      },
+      imageDiffHtml() {
+        return this.discussion.imageDiffHtml;
+      },
+    },
+    mounted() {
+      if (this.isImageDiff) {
+        const canCreateNote = false;
+        const renderCommentBadge = true;
+        imageDiffHelper.initImageDiff(this.$refs.fileHolder, canCreateNote, renderCommentBadge);
+      } else {
+        const fileHolder = $(this.$refs.fileHolder);
+        this.$nextTick(() => {
+          syntaxHighlight(fileHolder);
+        });
+      }
+    },
+    methods: {
+      rowTag(html) {
+        return html.outerHTML ? 'tr' : 'template';
+      },
+    },
+  };
+</script>
+
+<template>
+  <div
+    ref="fileHolder"
+    class="diff-file file-holder"
+    :class="diffFileClass"
+  >
+    <div class="js-file-title file-title file-title-flex-parent">
+      <diff-file-header
+        :diff-file="diffFile"
+      />
+    </div>
+    <div
+      v-if="diffFile.text"
+      class="diff-content code js-syntax-highlight"
+    >
+      <table>
+        <component
+          :is="rowTag(html)"
+          :class="html.className"
+          v-for="(html, index) in diffRows"
+          v-html="html.outerHTML"
+          :key="index"
+        />
+        <tr class="notes_holder">
+          <td
+            class="notes_line"
+            colspan="2"
+          ></td>
+          <td class="notes_content">
+            <slot></slot>
+          </td>
+        </tr>
+      </table>
+    </div>
+    <div
+      v-else
+    >
+      <div v-html="imageDiffHtml"></div>
+      <slot></slot>
+    </div>
+  </div>
+</template>

app/assets/javascripts/notes/components/discussion_counter.vue

+<script>
+  import { mapGetters } from 'vuex';
+  import resolveSvg from 'icons/_icon_resolve_discussion.svg';
+  import resolvedSvg from 'icons/_icon_status_success_solid.svg';
+  import mrIssueSvg from 'icons/_icon_mr_issue.svg';
+  import nextDiscussionSvg from 'icons/_next_discussion.svg';
+  import { pluralize } from '../../lib/utils/text_utility';
+  import { scrollToElement } from '../../lib/utils/common_utils';
+  import tooltip from '../../vue_shared/directives/tooltip';
+
+  export default {
+    directives: {
+      tooltip,
+    },
+    computed: {
+      ...mapGetters([
+        'getUserData',
+        'getNoteableData',
+        'discussionCount',
+        'unresolvedDiscussions',
+        'resolvedDiscussionCount',
+      ]),
+      isLoggedIn() {
+        return this.getUserData.id;
+      },
+      hasNextButton() {
+        return this.isLoggedIn && !this.allResolved;
+      },
+      countText() {
+        return pluralize('discussion', this.discussionCount);
+      },
+      allResolved() {
+        return this.resolvedDiscussionCount === this.discussionCount;
+      },
+      resolveAllDiscussionsIssuePath() {
+        return this.getNoteableData.create_issue_to_resolve_discussions_path;
+      },
+      firstUnresolvedDiscussionId() {
+        const item = this.unresolvedDiscussions[0] || {};
+
+        return item.id;
+      },
+    },
+    created() {
+      this.resolveSvg = resolveSvg;
+      this.resolvedSvg = resolvedSvg;
+      this.mrIssueSvg = mrIssueSvg;
+      this.nextDiscussionSvg = nextDiscussionSvg;
+    },
+    methods: {
+      jumpToFirstDiscussion() {
+        const el = document.querySelector(`[data-discussion-id="${this.firstUnresolvedDiscussionId}"]`);
+        const activeTab = window.mrTabs.currentAction;
+
+        if (activeTab === 'commits' || activeTab === 'pipelines') {
+          window.mrTabs.activateTab('show');
+        }
+
+        if (el) {
+          scrollToElement(el);
+        }
+      },
+    },
+  };
+</script>
+
+<template>
+  <div class="line-resolve-all-container prepend-top-10">
+    <div>
+      <div
+        v-if="discussionCount > 0"
+        :class="{ 'has-next-btn': hasNextButton }"
+        class="line-resolve-all">
+        <span
+          :class="{ 'is-active': allResolved }"
+          class="line-resolve-btn is-disabled"
+          type="button">
+          <span
+            v-if="allResolved"
+            v-html="resolvedSvg"
+          ></span>
+          <span
+            v-else
+            v-html="resolveSvg"
+          ></span>
+        </span>
+        <span class=".line-resolve-text">
+          {{ resolvedDiscussionCount }}/{{ discussionCount }} {{ countText }} resolved
+        </span>
+      </div>
+      <div
+        v-if="resolveAllDiscussionsIssuePath && !allResolved"
+        class="btn-group"
+        role="group">
+        <a
+          :href="resolveAllDiscussionsIssuePath"
+          v-tooltip
+          title="Resolve all discussions in new issue"
+          data-container="body"
+          class="new-issue-for-discussion btn btn-default discussion-create-issue-btn">
+          <span v-html="mrIssueSvg"></span>
+        </a>
+      </div>
+      <div
+        v-if="isLoggedIn && !allResolved"
+        class="btn-group"
+        role="group">
+        <button
+          @click="jumpToFirstDiscussion"
+          v-tooltip
+          title="Jump to first unresolved discussion"
+          data-container="body"
+          class="btn btn-default discussion-next-btn">
+          <span v-html="nextDiscussionSvg"></span>
+        </button>
+      </div>
+    </div>
+  </div>
+</template>

app/assets/javascripts/notes/components/note_actions.vue

@@ -4,6 +4,8 @@
   import emojiSmile from 'icons/_emoji_smile.svg';
   import emojiSmiley from 'icons/_emoji_smiley.svg';
   import editSvg from 'icons/_icon_pencil.svg';
+  import resolveDiscussionSvg from 'icons/_icon_resolve_discussion.svg';
+  import resolvedDiscussionSvg from 'icons/_icon_status_success_solid.svg';
   import ellipsisSvg from 'icons/_ellipsis_v.svg';
   import loadingIcon from '~/vue_shared/components/loading_icon.vue';
   import tooltip from '~/vue_shared/directives/tooltip';
@@ -42,6 +44,26 @@
         type: Boolean,
         required: true,
       },
+      resolvable: {
+        type: Boolean,
+        required: false,
+        default: false,
+      },
+      isResolved: {
+        type: Boolean,
+        required: false,
+        default: false,
+      },
+      isResolving: {
+        type: Boolean,
+        required: false,
+        default: false,
+      },
+      resolvedBy: {
+        type: Object,
+        required: false,
+        default: () => ({}),
+      },
       canReportAsAbuse: {
         type: Boolean,
         required: true,
@@ -63,6 +85,15 @@
       currentUserId() {
         return this.getUserDataByProp('id');
       },
+      resolveButtonTitle() {
+        let title = 'Mark as resolved';
+
+        if (this.resolvedBy) {
+          title = `Resolved by ${this.resolvedBy.name}`;
+        }
+
+        return title;
+      },
     },
     created() {
       this.emojiSmiling = emojiSmiling;
@@ -70,6 +101,8 @@
       this.emojiSmiley = emojiSmiley;
       this.editSvg = editSvg;
       this.ellipsisSvg = ellipsisSvg;
+      this.resolveDiscussionSvg = resolveDiscussionSvg;
+      this.resolvedDiscussionSvg = resolvedDiscussionSvg;
     },
     methods: {
       onEdit() {
@@ -78,6 +111,9 @@
       onDelete() {
         this.$emit('handleDelete');
       },
+      onResolve() {
+        this.$emit('handleResolve');
+      },
     },
   };
 </script>
@@ -89,6 +125,31 @@
       class="note-role user-access-role">
       {{ accessLevel }}
     </span>
+    <div
+      v-if="resolvable"
+      class="note-actions-item">
+      <button
+        v-tooltip
+        @click="onResolve"
+        :class="{ 'is-disabled': !resolvable, 'is-active': isResolved }"
+        :title="resolveButtonTitle"
+        :aria-label="resolveButtonTitle"
+        type="button"
+        class="line-resolve-btn note-action-button">
+        <template v-if="!isResolving">
+          <div
+            v-if="isResolved"
+            v-html="resolvedDiscussionSvg"></div>
+          <div
+            v-else
+            v-html="resolveDiscussionSvg"></div>
+        </template>
+        <loading-icon
+          v-else
+          :inline="true"
+        />
+      </button>
+    </div>
     <div
       v-if="canAddAwardEmoji"
       class="note-actions-item">

app/assets/javascripts/notes/components/note_body.vue

@@ -41,7 +41,7 @@
       this.initTaskList();
 
       if (this.isEditing) {
-        this.initAutoSave();
+        this.initAutoSave(this.note.noteable_type);
       }
     },
     updated() {
@@ -50,7 +50,7 @@
 
       if (this.isEditing) {
         if (!this.autosave) {
-          this.initAutoSave();
+          this.initAutoSave(this.note.noteable_type);
         } else {
           this.setAutoSave();
         }

app/assets/javascripts/notes/components/note_form.vue

 <script>
-  import { mapGetters } from 'vuex';
+  import { mapGetters, mapActions } from 'vuex';
   import eventHub from '../event_hub';
   import issueWarning from '../../vue_shared/components/issue/issue_warning.vue';
   import markdownField from '../../vue_shared/components/markdown/field.vue';
   import issuableStateMixin from '../mixins/issuable_state';
+  import resolvable from '../mixins/resolvable';
 
   export default {
     name: 'IssueNoteForm',
@@ -13,6 +14,7 @@
     },
     mixins: [
       issuableStateMixin,
+      resolvable,
     ],
     props: {
       noteBody: {
@@ -30,7 +32,7 @@
         required: false,
         default: 'Save comment',
       },
-      discussion: {
+      note: {
         type: Object,
         required: false,
         default: () => ({}),
@@ -42,9 +44,11 @@
     },
     data() {
       return {
-        note: this.noteBody,
+        updatedNoteBody: this.noteBody,
         conflictWhileEditing: false,
         isSubmitting: false,
+        isResolving: false,
+        resolveAsThread: true,
       };
     },
     computed: {
@@ -71,13 +75,13 @@
         return this.getUserDataByProp('id');
       },
       isDisabled() {
-        return !this.note.length || this.isSubmitting;
+        return !this.updatedNoteBody.length || this.isSubmitting;
       },
     },
     watch: {
       noteBody() {
-        if (this.note === this.noteBody) {
-          this.note = this.noteBody;
+        if (this.updatedNoteBody === this.noteBody) {
+          this.updatedNoteBody = this.noteBody;
         } else {
           this.conflictWhileEditing = true;
         }
@@ -87,16 +91,24 @@
       this.$refs.textarea.focus();
     },
     methods: {
-      handleUpdate() {
+      ...mapActions([
+        'toggleResolveNote',
+      ]),
+      handleUpdate(shouldResolve) {
+        const beforeSubmitDiscussionState = this.discussionResolved;
         this.isSubmitting = true;
 
-        this.$emit('handleFormUpdate', this.note, this.$refs.editNoteForm, () => {
+        this.$emit('handleFormUpdate', this.updatedNoteBody, this.$refs.editNoteForm, () => {
           this.isSubmitting = false;
+
+          if (shouldResolve) {
+            this.resolveHandler(beforeSubmitDiscussionState);
+          }
         });
       },
       editMyLastNote() {
-        if (this.note === '') {
-          const lastNoteInDiscussion = this.getDiscussionLastNote(this.discussion);
+        if (this.updatedNoteBody === '') {
+          const lastNoteInDiscussion = this.getDiscussionLastNote(this.updatedNoteBody);
 
           if (lastNoteInDiscussion) {
             eventHub.$emit('enterEditMode', {
@@ -107,7 +119,7 @@
       },
       cancelHandler(shouldConfirm = false) {
         // Sends information about confirm message and if the textarea has changed
-        this.$emit('cancelFormEdition', shouldConfirm, this.noteBody !== this.note);
+        this.$emit('cancelFormEdition', shouldConfirm, this.noteBody !== this.updatedNoteBody);
       },
     },
   };
@@ -150,7 +162,7 @@
 js-autosize markdown-area js-vue-issue-note-form js-vue-textarea"
           :data-supports-quick-actions="!isEditing"
           aria-label="Description"
-          v-model="note"
+          v-model="updatedNoteBody"
           ref="textarea"
           slot="textarea"
           placeholder="Write a comment or drag your files here..."
@@ -168,6 +180,13 @@ js-autosize markdown-area js-vue-issue-note-form js-vue-textarea"
           class="js-vue-issue-save btn btn-save">
           {{ saveButtonTitle }}
         </button>
+        <button
+          v-if="note.resolvable"
+          @click.prevent="handleUpdate(true)"
+          class="btn btn-nr btn-default append-right-10 js-comment-resolve-button"
+        >
+          {{ resolveButtonTitle }}
+        </button>
         <button
           @click="cancelHandler()"
           class="btn btn-cancel note-edit-cancel"

app/assets/javascripts/notes/components/note_header.vue

@@ -34,15 +34,15 @@
         required: false,
         default: false,
       },
+      expanded: {
+        type: Boolean,
+        required: false,
+        default: true,
       },
-    data() {
-      return {
-        isExpanded: true,
-      };
     },
     computed: {
       toggleChevronClass() {
-        return this.isExpanded ? 'fa-chevron-up' : 'fa-chevron-down';
+        return this.expanded ? 'fa-chevron-up' : 'fa-chevron-down';
       },
       noteTimestampLink() {
         return `#note_${this.noteId}`;
@@ -53,7 +53,6 @@
         'setTargetNoteHash',
       ]),
       handleToggle() {
-        this.isExpanded = !this.isExpanded;
         this.$emit('toggleHandler');
       },
       updateTargetNoteHash() {

app/assets/javascripts/notes/components/noteable_discussion.vue

 <script>
   import { mapActions, mapGetters } from 'vuex';
+  import resolveDiscussionsSvg from 'icons/_icon_mr_issue.svg';
+  import nextDiscussionsSvg from 'icons/_next_discussion.svg';
   import Flash from '../../flash';
   import { SYSTEM_NOTE } from '../constants';
   import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
@@ -8,13 +10,19 @@
   import noteSignedOutWidget from './note_signed_out_widget.vue';
   import noteEditedText from './note_edited_text.vue';
   import noteForm from './note_form.vue';
+  import diffWithNote from './diff_with_note.vue';
   import placeholderNote from '../../vue_shared/components/notes/placeholder_note.vue';
   import placeholderSystemNote from '../../vue_shared/components/notes/placeholder_system_note.vue';
   import autosave from '../mixins/autosave';
+  import noteable from '../mixins/noteable';
+  import resolvable from '../mixins/resolvable';
+  import tooltip from '../../vue_shared/directives/tooltip';
+  import { scrollToElement } from '../../lib/utils/common_utils';
 
   export default {
     components: {
       noteableNote,
+      diffWithNote,
       userAvatarLink,
       noteHeader,
       noteSignedOutWidget,
@@ -23,8 +31,13 @@
       placeholderNote,
       placeholderSystemNote,
     },
+    directives: {
+      tooltip,
+    },
     mixins: [
       autosave,
+      noteable,
+      resolvable,
     ],
     props: {
       note: {
@@ -35,14 +48,25 @@
     data() {
       return {
         isReplying: false,
+        isResolving: false,
+        resolveAsThread: true,
       };
     },
     computed: {
       ...mapGetters([
         'getNoteableData',
+        'discussionCount',
+        'resolvedDiscussionCount',
+        'unresolvedDiscussions',
       ]),
       discussion() {
-        return this.note.notes[0];
+        return {
+          ...this.note.notes[0],
+          truncatedDiffLines: this.note.truncated_diff_lines,
+          diffFile: this.note.diff_file,
+          diffDiscussion: this.note.diff_discussion,
+          imageDiffHtml: this.note.image_diff_html,
+        };
       },
       author() {
         return this.discussion.author;
@@ -71,26 +95,40 @@
 
         return null;
       },
+      hasUnresolvedDiscussion() {
+        return this.unresolvedDiscussions.length > 0;
+      },
+      wrapperComponent() {
+        return (this.discussion.diffDiscussion && this.discussion.diffFile) ? diffWithNote : 'div';
+      },
+      wrapperClass() {
+        return this.isDiffDiscussion ? '' : 'panel panel-default';
+      },
     },
     mounted() {
       if (this.isReplying) {
-        this.initAutoSave();
+        this.initAutoSave(this.discussion.noteable_type);
       }
     },
     updated() {
       if (this.isReplying) {
         if (!this.autosave) {
-          this.initAutoSave();
+          this.initAutoSave(this.discussion.noteable_type);
         } else {
           this.setAutoSave();
         }
       }
     },
+    created() {
+      this.resolveDiscussionsSvg = resolveDiscussionsSvg;
+      this.nextDiscussionsSvg = nextDiscussionsSvg;
+    },
     methods: {
       ...mapActions([
         'saveNote',
         'toggleDiscussion',
         'removePlaceholderNotes',
+        'toggleResolveNote',
       ]),
       componentName(note) {
         if (note.isPlaceholderNote) {
@@ -103,7 +141,7 @@
         return noteableNote;
       },
       componentData(note) {
-        return note.isPlaceholderNote ? note.notes[0] : note;
+        return note.isPlaceholderNote ? this.note.notes[0] : note;
       },
       toggleDiscussionHandler() {
         this.toggleDiscussion({ discussionId: this.note.id });
@@ -128,7 +166,7 @@
           flashContainer: this.$el,
           data: {
             in_reply_to_discussion_id: this.note.reply_id,
-            target_type: 'issue',
+            target_type: this.noteableType,
             target_id: this.discussion.noteable_id,
             note: { note: noteText },
           },
@@ -152,12 +190,27 @@ Please check your network connection and try again.`;
             });
           });
       },
+      jumpToDiscussion() {
+        const unresolvedIds = this.unresolvedDiscussions.map(d => d.id);
+        const index = unresolvedIds.indexOf(this.note.id);
+
+        if (index >= 0 && index !== unresolvedIds.length) {
+          const nextId = unresolvedIds[index + 1];
+          const el = document.querySelector(`[data-discussion-id="${nextId}"]`);
+
+          if (el) {
+            scrollToElement(el);
+          }
+        }
+      },
     },
   };
 </script>
 
 <template>
-  <li class="note note-discussion timeline-entry">
+  <li
+    :data-discussion-id="note.id"
+    class="note note-discussion timeline-entry">
     <div class="timeline-entry-inner">
       <div class="timeline-icon">
         <user-avatar-link
@@ -175,6 +228,7 @@ Please check your network connection and try again.`;
               :created-at="discussion.created_at"
               :note-id="discussion.id"
               :include-toggle="true"
+              :expanded="note.expanded"
               @toggleHandler="toggleDiscussionHandler"
               action-text="started a discussion"
               class="discussion"
@@ -187,11 +241,14 @@ Please check your network connection and try again.`;
               class-name="discussion-headline-light js-discussion-headline"
             />
           </div>
-        </div>
           <div
             v-if="note.expanded"
             class="discussion-body">
-          <div class="panel panel-default">
+            <component
+              :is="wrapperComponent"
+              :discussion="discussion"
+              :class="wrapperClass"
+            >
               <div class="discussion-notes">
                 <ul class="notes">
                   <component
@@ -204,26 +261,83 @@ Please check your network connection and try again.`;
                 <div
                   :class="{ 'is-replying': isReplying }"
                   class="discussion-reply-holder">
+                  <template v-if="!isReplying && canReply">
+                    <div
+                      class="btn-group-justified discussion-with-resolve-btn"
+                      role="group">
+                      <div
+                        class="btn-group"
+                        role="group">
                         <button
-                  v-if="canReply && !isReplying"
                           @click="showReplyForm"
                           type="button"
                           class="js-vue-discussion-reply btn btn-text-field"
-                  title="Add a reply">
-                  Reply...
+                          title="Add a reply">Reply...</button>
+                      </div>
+                      <div
+                        v-if="note.resolvable"
+                        class="btn-group"
+                        role="group">
+                        <button
+                          @click="resolveHandler()"
+                          type="button"
+                          class="btn btn-default"
+                        >
+                          <i
+                            v-if="isResolving"
+                            aria-hidden="true"
+                            class="fa fa-spinner fa-spin"
+                          ></i>
+                          {{ resolveButtonTitle }}
                         </button>
+                      </div>
+                      <div
+                        class="btn-group discussion-actions"
+                        role="group">
+                        <div
+                          v-if="note.resolvable && !discussionResolved"
+                          class="btn-group"
+                          role="group">
+                          <a
+                            :href="note.resolve_with_issue_path"
+                            v-tooltip
+                            class="new-issue-for-discussion btn
+                              btn-default discussion-create-issue-btn"
+                            title="Resolve this discussion in a new issue"
+                            data-container="body"
+                          >
+                            <span v-html="resolveDiscussionsSvg"></span>
+                          </a>
+                        </div>
+                        <div
+                          v-if="hasUnresolvedDiscussion"
+                          class="btn-group"
+                          role="group">
+                          <button
+                            @click="jumpToDiscussion"
+                            v-tooltip
+                            class="btn btn-default discussion-next-btn"
+                            title="Jump to next unresolved discussion"
+                            data-container="body"
+                          >
+                            <span v-html="nextDiscussionsSvg"></span>
+                          </button>
+                        </div>
+                      </div>
+                    </div>
+                  </template>
                   <note-form
                     v-if="isReplying"
                     save-button-title="Comment"
-                  :discussion="note"
+                    :note="note"
                     :is-editing="false"
                     @handleFormUpdate="saveReply"
                     @cancelFormEdition="cancelReplyForm"
-                  ref="noteForm"
-                />
+                    ref="noteForm" />
                   <note-signed-out-widget v-if="!canReply" />
                 </div>
               </div>
+            </component>
           </div>
         </div>
       </div>

app/assets/javascripts/notes/components/noteable_note.vue

@@ -7,6 +7,8 @@
   import noteActions from './note_actions.vue';
   import noteBody from './note_body.vue';
   import eventHub from '../event_hub';
+  import noteable from '../mixins/noteable';
+  import resolvable from '../mixins/resolvable';
 
   export default {
     components: {
@@ -15,6 +17,10 @@
       noteActions,
       noteBody,
     },
+    mixins: [
+      noteable,
+      resolvable,
+    ],
     props: {
       note: {
         type: Object,
@@ -26,6 +32,7 @@
         isEditing: false,
         isDeleting: false,
         isRequesting: false,
+        isResolving: false,
       };
     },
     computed: {
@@ -65,6 +72,7 @@
       ...mapActions([
         'deleteNote',
         'updateNote',
+        'toggleResolveNote',
         'scrollToNoteIfNeeded',
       ]),
       editHandler() {
@@ -89,7 +97,7 @@
         const data = {
           endpoint: this.note.path,
           note: {
-            target_type: 'issue',
+            target_type: this.noteableType,
             target_id: this.note.noteable_id,
             note: { note: noteText },
           },
@@ -134,7 +142,7 @@
         // we need to do this to prevent noteForm inconsistent content warning
         // this is something we intentionally do so we need to recover the content
         this.note.note = noteText;
-        this.$refs.noteBody.$refs.noteForm.note = noteText;
+        this.$refs.noteBody.$refs.noteForm.note.note = noteText;
       },
     },
   };
@@ -171,8 +179,13 @@
             :can-delete="note.current_user.can_edit"
             :can-report-as-abuse="canReportAsAbuse"
             :report-abuse-path="note.report_abuse_path"
+            :resolvable="note.resolvable"
+            :is-resolved="note.resolved"
+            :is-resolving="isResolving"
+            :resolved-by="note.resolved_by"
             @handleEdit="editHandler"
             @handleDelete="deleteHandler"
+            @handleResolve="resolveHandler"
           />
         </div>
         <note-body

app/assets/javascripts/notes/components/notes_app.vue

@@ -11,6 +11,7 @@
   import placeholderNote from '../../vue_shared/components/notes/placeholder_note.vue';
   import placeholderSystemNote from '../../vue_shared/components/notes/placeholder_system_note.vue';
   import loadingIcon from '../../vue_shared/components/loading_icon.vue';
+  import skeletonLoadingContainer from '../../vue_shared/components/notes/skeleton_note.vue';
 
   export default {
     name: 'NotesApp',
@@ -48,7 +49,24 @@
       ...mapGetters([
         'notes',
         'getNotesDataByProp',
+        'discussionCount',
       ]),
+      noteableType() {
+        // FIXME -- @fatihacet Get this from JSON data.
+        const { ISSUE_NOTEABLE_TYPE, MERGE_REQUEST_NOTEABLE_TYPE } = constants;
+
+        return this.noteableData.merge_params ? MERGE_REQUEST_NOTEABLE_TYPE : ISSUE_NOTEABLE_TYPE;
+      },
+      allNotes() {
+        if (this.isLoading) {
+          const totalNotes = parseInt(this.notesData.totalNotes, 10) || 0;
+
+          return new Array(totalNotes).fill({
+            isSkeletonNote: true,
+          });
+        }
+        return this.notes;
+      },
     },
     created() {
       this.setNotesData(this.notesData);
@@ -67,6 +85,10 @@
           this.actionToggleAward({ awardName, noteId });
         });
       }
+      document.addEventListener('refreshVueNotes', this.fetchNotes);
+    },
+    beforeDestroy() {
+      document.removeEventListener('refreshVueNotes', this.fetchNotes);
     },
     methods: {
       ...mapActions({
@@ -81,6 +103,9 @@
         setTargetNoteHash: 'setTargetNoteHash',
       }),
       getComponentName(note) {
+        if (note.isSkeletonNote) {
+          return skeletonLoadingContainer;
+        }
         if (note.isPlaceholderNote) {
           if (note.placeholderType === constants.SYSTEM_NOTE) {
             return placeholderSystemNote;
@@ -109,9 +134,14 @@
           });
       },
       initPolling() {
+        if (this.isPollingInitialized) {
+          return;
+        }
+
         this.setLastFetchedAt(this.getNotesDataByProp('lastFetchedAt'));
 
         this.poll();
+        this.isPollingInitialized = true;
       },
       checkLocationHash() {
         const hash = getLocationHash();
@@ -128,25 +158,20 @@
 
 <template>
   <div id="notes">
-    <div
-      v-if="isLoading"
-      class="js-loading loading">
-      <loading-icon />
-    </div>
-
     <ul
-      v-if="!isLoading"
       id="notes-list"
       class="notes main-notes-list timeline">
 
       <component
-        v-for="note in notes"
+        v-for="note in allNotes"
         :is="getComponentName(note)"
         :note="getComponentData(note)"
         :key="note.id"
       />
     </ul>
 
-    <comment-form />
+    <comment-form
+      :noteable-type="noteableType"
+    />
   </div>
 </template>

app/assets/javascripts/notes/constants.js

 export const DISCUSSION_NOTE = 'DiscussionNote';
+export const DIFF_NOTE = 'DiffNote';
 export const DISCUSSION = 'discussion';
 export const NOTE = 'note';
 export const SYSTEM_NOTE = 'systemNote';
@@ -8,4 +9,7 @@ export const REOPENED = 'reopened';
 export const CLOSED = 'closed';
 export const EMOJI_THUMBSUP = 'thumbsup';
 export const EMOJI_THUMBSDOWN = 'thumbsdown';
-export const NOTEABLE_TYPE = 'Issue';
+export const ISSUE_NOTEABLE_TYPE = 'issue';
+export const MERGE_REQUEST_NOTEABLE_TYPE = 'merge_request';
+export const UNRESOLVE_NOTE_METHOD_NAME = 'delete';
+export const RESOLVE_NOTE_METHOD_NAME = 'post';

app/assets/javascripts/notes/index.js

@@ -20,17 +20,7 @@ document.addEventListener('DOMContentLoaded', () => new Vue({
     return {
       noteableData: JSON.parse(notesDataset.noteableData),
       currentUserData,
-      notesData: {
-        lastFetchedAt: notesDataset.lastFetchedAt,
-        discussionsPath: notesDataset.discussionsPath,
-        newSessionPath: notesDataset.newSessionPath,
-        registerPath: notesDataset.registerPath,
-        notesPath: notesDataset.notesPath,
-        markdownDocsPath: notesDataset.markdownDocsPath,
-        quickActionsDocsPath: notesDataset.quickActionsDocsPath,
-        closeIssuePath: notesDataset.closeIssuePath,
-        reopenIssuePath: notesDataset.reopenIssuePath,
-      },
+      notesData: JSON.parse(notesDataset.notesData),
     };
   },
   render(createElement) {

app/assets/javascripts/notes/mixins/autosave.js

 import Autosave from '../../autosave';
+import { capitalizeFirstCharacter } from '../../lib/utils/text_utility';
 
 export default {
   methods: {
-    initAutoSave() {
-      this.autosave = new Autosave($(this.$refs.noteForm.$refs.textarea), ['Note', 'Issue', this.note.id], 'issue');
+    initAutoSave(noteableType) {
+      this.autosave = new Autosave($(this.$refs.noteForm.$refs.textarea), ['Note', capitalizeFirstCharacter(noteableType), this.note.id]);
     },
     resetAutoSave() {
       this.autosave.reset();

app/assets/javascripts/notes/mixins/noteable.js

+import * as constants from '../constants';
+
+export default {
+  props: {
+    note: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    noteableType() {
+      switch (this.note.noteable_type) {
+        case 'MergeRequest':
+          return constants.MERGE_REQUEST_NOTEABLE_TYPE;
+        case 'Issue':
+          return constants.ISSUE_NOTEABLE_TYPE;
+        default:
+          return '';
+      }
+    },
+  },
+};

app/assets/javascripts/notes/mixins/resolvable.js

+import Flash from '~/flash';
+import { __ } from '~/locale';
+
+export default {
+  props: {
+    note: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    discussionResolved() {
+      const { notes, resolved } = this.note;
+
+      if (notes) { // Decide resolved state using store. Only valid for discussions.
+        return notes.every(note => note.resolved && !note.system);
+      }
+
+      return resolved;
+    },
+    resolveButtonTitle() {
+      if (this.updatedNoteBody) {
+        if (this.discussionResolved) {
+          return __('Comment and unresolve discussion');
+        }
+
+        return __('Comment and resolve discussion');
+      }
+      return this.discussionResolved ? __('Unresolve discussion') : __('Resolve discussion');
+    },
+  },
+  methods: {
+    resolveHandler(resolvedState = false) {
+      this.isResolving = true;
+      const endpoint = this.note.resolve_path || `${this.note.path}/resolve`;
+      const isResolved = this.discussionResolved || resolvedState;
+      const discussion = this.resolveAsThread;
+
+      this.toggleResolveNote({ endpoint, isResolved, discussion })
+        .then(() => {
+          this.isResolving = false;
+        })
+        .catch(() => {
+          this.isResolving = false;
+          const msg = __('Something went wrong while resolving this discussion. Please try again.');
+          Flash(msg, 'alert', this.$el);
+        });
+    },
+  },
+};

app/assets/javascripts/notes/services/notes_service.js

 import Vue from 'vue';
 import VueResource from 'vue-resource';
+import * as constants from '../constants';
 
 Vue.use(VueResource);
 
@@ -19,6 +20,12 @@ export default {
   createNewNote(endpoint, data) {
     return Vue.http.post(endpoint, data, { emulateJSON: true });
   },
+  toggleResolveNote(endpoint, isResolved) {
+    const { RESOLVE_NOTE_METHOD_NAME, UNRESOLVE_NOTE_METHOD_NAME } = constants;
+    const method = isResolved ? UNRESOLVE_NOTE_METHOD_NAME : RESOLVE_NOTE_METHOD_NAME;
+
+    return Vue.http[method](endpoint);
+  },
   poll(data = {}) {
     const { endpoint, lastFetchedAt } = data;
     const options = {

app/assets/javascripts/notes/stores/actions.js

@@ -61,8 +61,17 @@ export const createNewNote = ({ commit }, { endpoint, data }) => service
 export const removePlaceholderNotes = ({ commit }) =>
   commit(types.REMOVE_PLACEHOLDER_NOTES);
 
+export const toggleResolveNote = ({ commit }, { endpoint, isResolved, discussion }) => service
+  .toggleResolveNote(endpoint, isResolved)
+  .then(res => res.json())
+  .then((res) => {
+    const mutationType = discussion ? types.UPDATE_DISCUSSION : types.UPDATE_NOTE;
+
+    commit(mutationType, res);
+  });
+
 export const closeIssue = ({ commit, dispatch, state }) => service
-  .toggleIssueState(state.notesData.closeIssuePath)
+  .toggleIssueState(state.notesData.closePath)
   .then(res => res.json())
   .then((data) => {
     commit(types.CLOSE_ISSUE);
@@ -70,7 +79,7 @@ export const closeIssue = ({ commit, dispatch, state }) => service
   });
 
 export const reopenIssue = ({ commit, dispatch, state }) => service
-  .toggleIssueState(state.notesData.reopenIssuePath)
+  .toggleIssueState(state.notesData.reopenPath)
   .then(res => res.json())
   .then((data) => {
     commit(types.REOPEN_ISSUE);
@@ -80,7 +89,7 @@ export const reopenIssue = ({ commit, dispatch, state }) => service
 export const emitStateChangedEvent = ({ commit, getters }, data) => {
   const event = new CustomEvent('issuable_vue_app:change', { detail: {
     data,
-    isClosed: getters.issueState === constants.CLOSED,
+    isClosed: getters.openState === constants.CLOSED,
   } });
 
   document.dispatchEvent(event);
@@ -174,7 +183,7 @@ const pollSuccessCallBack = (resp, commit, state, getters) => {
     resp.notes.forEach((note) => {
       if (notesById[note.id]) {
         commit(types.UPDATE_NOTE, note);
-      } else if (note.type === constants.DISCUSSION_NOTE) {
+      } else if (note.type === constants.DISCUSSION_NOTE || note.type === constants.DIFF_NOTE) {
         const discussion = utils.findNoteObjectById(state.notes, note.discussion_id);
 
         if (discussion) {

app/assets/javascripts/notes/stores/getters.js

@@ -8,7 +8,7 @@ export const getNotesDataByProp = state => prop => state.notesData[prop];
 
 export const getNoteableData = state => state.noteableData;
 export const getNoteableDataByProp = state => prop => state.noteableData[prop];
-export const issueState = state => state.noteableData.state;
+export const openState = state => state.noteableData.state;
 
 export const getUserData = state => state.userData || {};
 export const getUserDataByProp = state => prop => state.userData && state.userData[prop];
@@ -30,3 +30,37 @@ export const getCurrentUserLastNote = state => _.flatten(
 
 export const getDiscussionLastNote = state => discussion => reverseNotes(discussion.notes)
   .find(el => isLastNote(el, state));
+
+export const discussionCount = (state) => {
+  const discussions = state.notes.filter(n => !n.individual_note);
+
+  return discussions.length;
+};
+
+export const unresolvedDiscussions = (state, getters) => {
+  const resolvedMap = getters.resolvedDiscussionsById;
+
+  return state.notes.filter(n => !n.individual_note && !resolvedMap[n.id]);
+};
+
+export const resolvedDiscussionsById = (state) => {
+  const map = {};
+
+  state.notes.forEach((n) => {
+    if (n.notes) {
+      const resolved = n.notes.every(note => note.resolved && !note.system);
+
+      if (resolved) {
+        map[n.id] = n;
+      }
+    }
+  });
+
+  return map;
+};
+
+export const resolvedDiscussionCount = (state, getters) => {
+  const resolvedMap = getters.resolvedDiscussionsById;
+
+  return Object.keys(resolvedMap).length;
+};

app/assets/javascripts/notes/stores/mutation_types.js

@@ -12,6 +12,7 @@ export const SHOW_PLACEHOLDER_NOTE = 'SHOW_PLACEHOLDER_NOTE';
 export const TOGGLE_AWARD = 'TOGGLE_AWARD';
 export const TOGGLE_DISCUSSION = 'TOGGLE_DISCUSSION';
 export const UPDATE_NOTE = 'UPDATE_NOTE';
+export const UPDATE_DISCUSSION = 'UPDATE_DISCUSSION';
 
 // Issue
 export const CLOSE_ISSUE = 'CLOSE_ISSUE';

app/assets/javascripts/notes/stores/mutations.js

 import * as utils from './utils';
 import * as types from './mutation_types';
 import * as constants from '../constants';
+import { isInMRPage } from '../../lib/utils/common_utils';
 
 export default {
   [types.ADD_NEW_NOTE](state, note) {
     const { discussion_id, type } = note;
     const [exists] = state.notes.filter(n => n.id === note.discussion_id);
+    const isDiscussion = (type === constants.DISCUSSION_NOTE);
 
     if (!exists) {
       const noteData = {
         expanded: true,
         id: discussion_id,
-        individual_note: !(type === constants.DISCUSSION_NOTE),
+        individual_note: !isDiscussion,
         notes: [note],
         reply_id: discussion_id,
       };
 
+      if (isDiscussion && isInMRPage()) {
+        noteData.resolvable = note.resolvable;
+        noteData.resolved = false;
+        noteData.resolve_path = note.resolve_path;
+        noteData.resolve_with_issue_path = note.resolve_with_issue_path;
+      }
+
       state.notes.push(noteData);
+      document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
     }
   },
 
@@ -25,6 +35,7 @@ export default {
 
     if (noteObj) {
       noteObj.notes.push(note);
+      document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
     }
   },
 
@@ -41,6 +52,8 @@ export default {
         state.notes.splice(state.notes.indexOf(noteObj), 1);
       }
     }
+
+    document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
   },
 
   [types.REMOVE_PLACEHOLDER_NOTES](state) {
@@ -77,15 +90,19 @@ export default {
     const notes = [];
 
     notesData.forEach((note) => {
+      const nn = Object.assign({}, note);
+
       // To support legacy notes, should be very rare case.
       if (note.individual_note && note.notes.length > 1) {
         note.notes.forEach((n) => {
-          const nn = Object.assign({}, note);
           nn.notes = [n]; // override notes array to only have one item to mimick individual_note
           notes.push(nn);
         });
       } else {
-        notes.push(note);
+        const oldNote = utils.findNoteObjectById(state.notes, note.id);
+        nn.expanded = oldNote ? oldNote.expanded : note.expanded;
+
+        notes.push(nn);
       }
     });
 
@@ -134,6 +151,8 @@ export default {
         user: { id, name, username },
       });
     }
+
+    document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
   },
 
   [types.TOGGLE_DISCUSSION](state, { discussionId }) {
@@ -151,6 +170,24 @@ export default {
       const comment = utils.findNoteObjectById(noteObj.notes, note.id);
       noteObj.notes.splice(noteObj.notes.indexOf(comment), 1, note);
     }
+
+    // document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
+  },
+
+  [types.UPDATE_DISCUSSION](state, noteData) {
+    const note = noteData;
+    let index = 0;
+
+    state.notes.forEach((n, i) => {
+      if (n.id === note.id) {
+        index = i;
+      }
+    });
+
+    note.expanded = true; // override expand flag to prevent collapse
+    state.notes.splice(index, 1, note);
+
+    document.dispatchEvent(new CustomEvent('refreshLegacyNotes'));
   },
 
   [types.CLOSE_ISSUE](state) {

app/assets/javascripts/notes/stores/utils.js

@@ -28,4 +28,3 @@ export const getQuickActionText = (note) => {
 export const hasQuickActions = note => REGEX_QUICK_ACTIONS.test(note);
 
 export const stripQuickActions = note => note.replace(REGEX_QUICK_ACTIONS, '').trim();
-

app/assets/javascripts/pages/projects/merge_requests/show/index.js

@@ -22,7 +22,6 @@ document.addEventListener('DOMContentLoaded', () => {
   initPipelines();
 
   const mrShowNode = document.querySelector('.merge-request');
-
   window.mergeRequest = new MergeRequest({
     action: mrShowNode.dataset.mrAction,
   });

app/assets/javascripts/vue_shared/components/clipboard_button.vue

 <script>
-  import tooltip from '../directives/tooltip';
   /**
    * Falls back to the code used in `copy_to_clipboard.js`
    */
+  import tooltip from '../directives/tooltip';
 
   export default {
     name: 'ClipboardButton',

app/assets/javascripts/vue_shared/components/issue/issue_warning.vue

@@ -11,14 +11,12 @@
         default: false,
         required: false,
       },
-
       isConfidential: {
         type: Boolean,
         default: false,
         required: false,
       },
     },
-
     computed: {
       warningIcon() {
         if (this.isConfidential) return 'eye-slash';
@@ -26,7 +24,6 @@
 
         return '';
       },
-
       isLockedAndConfidential() {
         return this.isConfidential && this.isLocked;
       },

app/assets/javascripts/vue_shared/components/notes/skeleton_note.vue

+<template>
+  <li class="timeline-entry note">
+    <div class="timeline-entry-inner">
+      <div class="timeline-icon">
+      </div>
+      <div class="timeline-content">
+        <div class="note-header"></div>
+        <div class="note-body">
+          <skeleton-loading-container />
+        </div>
+      </div>
+    </div>
+  </li>
+</template>
+
+<script>
+  import skeletonLoadingContainer from '~/vue_shared/components/skeleton_loading_container.vue';
+
+  export default {
+    components: {
+      skeletonLoadingContainer,
+    },
+  };
+</script>

app/assets/stylesheets/pages/notes.scss

@@ -723,7 +723,7 @@ ul.notes {
 .line-resolve-all {
   vertical-align: middle;
   display: inline-block;
-  padding: 5px 10px 6px;
+  padding: 6px 10px;
   background-color: $gray-light;
   border: 1px solid $border-color;
   border-radius: $border-radius-default;

app/controllers/concerns/issuable_actions.rb

@@ -77,6 +77,20 @@ module IssuableActions
     render json: { notice: "#{quantity} #{resource_name.pluralize(quantity)} updated" }
   end
 
+  def discussions
+    notes = issuable.notes
+      .inc_relations_for_view
+      .includes(:noteable)
+      .fresh
+
+    notes = prepare_notes_for_rendering(notes)
+    notes = notes.reject { |n| n.cross_reference_not_visible_for?(current_user) }
+
+    discussions = Discussion.build_collection(notes, issuable)
+
+    render json: DiscussionSerializer.new(project: project, noteable: issuable, current_user: current_user).represent(discussions, context: self)
+  end
+
   private
 
   def recaptcha_check_if_spammable(should_redirect = true, &block)

app/controllers/concerns/notes_actions.rb

@@ -22,7 +22,7 @@ module NotesActions
     notes = notes.reject { |n| n.cross_reference_not_visible_for?(current_user) }
 
     notes_json[:notes] =
-      if noteable.discussions_rendered_on_frontend?
+      if use_note_serializer?
         note_serializer.represent(notes)
       else
         notes.map { |note| note_json(note) }
@@ -95,7 +95,7 @@ module NotesActions
     if note.persisted?
       attrs[:valid] = true
 
-      if noteable.discussions_rendered_on_frontend?
+      if use_note_serializer?
         attrs.merge!(note_serializer.represent(note))
       else
         attrs.merge!(
@@ -233,4 +233,14 @@ module NotesActions
       the_project
     end
   end
+
+  def use_note_serializer?
+    return false if params['html']
+
+    if noteable.is_a?(MergeRequest)
+      cookies[:vue_mr_discussions] == 'true'
+    else
+      noteable.discussions_rendered_on_frontend?
+    end
+  end
 end

app/controllers/projects/discussions_controller.rb

 class Projects::DiscussionsController < Projects::ApplicationController
+  include NotesHelper
+  include RendersNotes
+
   before_action :check_merge_requests_available!
   before_action :merge_request
   before_action :discussion
@@ -7,22 +10,45 @@ class Projects::DiscussionsController < Projects::ApplicationController
   def resolve
     Discussions::ResolveService.new(project, current_user, merge_request: merge_request).execute(discussion)
 
-    render json: {
-      resolved_by: discussion.resolved_by.try(:name),
-      discussion_headline_html: view_to_html_string('discussions/_headline', discussion: discussion)
-    }
+    render_discussion
   end
 
   def unresolve
     discussion.unresolve!
 
+    render_discussion
+  end
+
+  private
+
+  def render_discussion
+    if serialize_notes?
+      # TODO - It is not needed to serialize notes when resolving
+      # or unresolving discussions. We should remove this behavior
+      # passing a parameter to DiscussionEntity to return an empty array
+      # for notes.
+      # Check issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/42853
+      prepare_notes_for_rendering(discussion.notes, merge_request)
+      render_json_with_discussions_serializer
+    else
+      render_json_with_html
+    end
+  end
+
+  def render_json_with_discussions_serializer
+    render json:
+      DiscussionSerializer.new(project: project, noteable: discussion.noteable, current_user: current_user)
+      .represent(discussion, context: self)
+  end
+
+  # Legacy method used to render discussions notes when not using Vue on views.
+  def render_json_with_html
     render json: {
+      resolved_by: discussion.resolved_by.try(:name),
       discussion_headline_html: view_to_html_string('discussions/_headline', discussion: discussion)
     }
   end
 
-  private
-
   def merge_request
     @merge_request ||= MergeRequestsFinder.new(current_user, project_id: @project.id).find_by!(iid: params[:merge_request_id])
   end

app/controllers/projects/issues_controller.rb

@@ -60,20 +60,6 @@ class Projects::IssuesController < Projects::ApplicationController
     respond_with(@issue)
   end
 
-  def discussions
-    notes = @issue.notes
-      .inc_relations_for_view
-      .includes(:noteable)
-      .fresh
-
-    notes = prepare_notes_for_rendering(notes)
-    notes = notes.reject { |n| n.cross_reference_not_visible_for?(current_user) }
-
-    discussions = Discussion.build_collection(notes, @issue)
-
-    render json: DiscussionSerializer.new(project: @project, noteable: @issue, current_user: current_user).represent(discussions)
-  end
-
   def create
     create_params = issue_params.merge(spammable_params).merge(
       merge_request_to_resolve_discussions_of: params[:merge_request_to_resolve_discussions_of],

app/controllers/projects/notes_controller.rb

 class Projects::NotesController < Projects::ApplicationController
   include NotesActions
+  include NotesHelper
   include ToggleAwardEmoji
 
   before_action :whitelist_query_limiting, only: [:create]
@@ -38,11 +39,15 @@ class Projects::NotesController < Projects::ApplicationController
 
     discussion = note.discussion
 
+    if serialize_notes?
+      render_json_with_notes_serializer
+    else
       render json: {
         resolved_by: note.resolved_by.try(:name),
         discussion_headline_html: (view_to_html_string('discussions/_headline', discussion: discussion) if discussion)
       }
     end
+  end
 
   def unresolve
     return render_404 unless note.resolvable?
@@ -51,16 +56,27 @@ class Projects::NotesController < Projects::ApplicationController
 
     discussion = note.discussion
 
+    if serialize_notes?
+      render_json_with_notes_serializer
+    else
       render json: {
         discussion_headline_html: (view_to_html_string('discussions/_headline', discussion: discussion) if discussion)
       }
     end
+  end
 
   private
 
+  def render_json_with_notes_serializer
+    Notes::RenderService.new(current_user).execute([note], project)
+
+    render json: note_serializer.represent(note)
+  end
+
   def note
     @note ||= @project.notes.find(params[:id])
   end
+
   alias_method :awardable, :note
 
   def finder_params

app/helpers/notes_helper.rb

@@ -151,7 +151,38 @@ module NotesHelper
     }
   end
 
+  def notes_data(issuable)
+    discussions_path =
+      if issuable.is_a?(Issue)
+        discussions_project_issue_path(@project, issuable, format: :json)
+      else
+        discussions_project_merge_request_path(@project, issuable, format: :json)
+      end
+
+    {
+      discussionsPath: discussions_path,
+      registerPath: new_session_path(:user, redirect_to_referer: 'yes', anchor: 'register-pane'),
+      newSessionPath: new_session_path(:user, redirect_to_referer: 'yes'),
+      markdownDocsPath: help_page_path('user/markdown'),
+      quickActionsDocsPath: help_page_path('user/project/quick_actions'),
+      closePath: close_issuable_path(issuable),
+      reopenPath: reopen_issuable_path(issuable),
+      notesPath: notes_url,
+      totalNotes: issuable.discussions.length,
+      lastFetchedAt: Time.now
+
+    }.to_json
+  end
+
   def discussion_resolved_intro(discussion)
     discussion.resolved_by_push? ? 'Automatically resolved' : 'Resolved'
   end
+
+  def has_vue_discussions_cookie?
+    cookies[:vue_mr_discussions] == 'true'
+  end
+
+  def serialize_notes?
+    has_vue_discussions_cookie? && !params['html']
+  end
 end

app/models/note.rb

@@ -133,6 +133,7 @@ class Note < ActiveRecord::Base
 
     def find_discussion(discussion_id)
       notes = where(discussion_id: discussion_id).fresh.to_a
+
       return if notes.empty?
 
       Discussion.build(notes)

app/serializers/diff_file_entity.rb

+class DiffFileEntity < Grape::Entity
+  include DiffHelper
+  include SubmoduleHelper
+  include BlobHelper
+  include IconsHelper
+  include ActionView::Helpers::TagHelper
+
+  expose :submodule?, as: :submodule
+
+  expose :submodule_link do |diff_file|
+    submodule_links(diff_file.blob, diff_file.content_sha, diff_file.repository).first
+  end
+
+  expose :blob_path do |diff_file|
+    diff_file.blob.path
+  end
+
+  expose :blob_icon do |diff_file|
+    blob_icon(diff_file.b_mode, diff_file.file_path)
+  end
+
+  expose :file_path
+  expose :deleted_file?, as: :deleted_file
+  expose :renamed_file?, as: :renamed_file
+  expose :old_path
+  expose :new_path
+  expose :mode_changed?, as: :mode_changed
+  expose :a_mode
+  expose :b_mode
+  expose :text?, as: :text
+
+  expose :old_path_html do |diff_file|
+    old_path = mark_inline_diffs(diff_file.old_path, diff_file.new_path)
+    old_path
+  end
+
+  expose :new_path_html do |diff_file|
+    _, new_path = mark_inline_diffs(diff_file.old_path, diff_file.new_path)
+    new_path
+  end
+end

app/serializers/discussion_entity.rb

@@ -7,4 +7,42 @@ class DiscussionEntity < Grape::Entity
   expose :notes, using: NoteEntity
 
   expose :individual_note?, as: :individual_note
+  expose :resolvable?, as: :resolvable
+  expose :resolved?, as: :resolved
+  expose :resolve_path, if: -> (d, _) { d.resolvable? } do |discussion|
+    resolve_project_merge_request_discussion_path(discussion.project, discussion.noteable, discussion.id)
+  end
+  expose :resolve_with_issue_path do |discussion|
+    new_project_issue_path(discussion.project, merge_request_to_resolve_discussions_of: discussion.noteable.iid, discussion_to_resolve: discussion.id)
+  end
+
+  expose :diff_file, using: DiffFileEntity, if: -> (d, _) { defined? d.diff_file }
+
+  expose :diff_discussion?, as: :diff_discussion
+
+  expose :truncated_diff_lines, if: -> (d, _) { (defined? d.diff_file) && d.diff_file.text? } do |discussion|
+    options[:context].render_to_string(
+      partial: "projects/diffs/line",
+      collection: discussion.truncated_diff_lines,
+      as: :line,
+      locals: { diff_file: discussion.diff_file,
+                discussion_expanded: true,
+                plain: true },
+      layout: false,
+      formats: [:html]
+    )
+  end
+
+  expose :image_diff_html, if: -> (d, _) { defined? d.diff_file } do |discussion|
+    diff_file = discussion.diff_file
+    partial = diff_file.new_file? || diff_file.deleted_file? ? 'single_image_diff' : 'replaced_image_diff'
+    options[:context].render_to_string(
+      partial: "projects/diffs/#{partial}",
+      locals: { diff_file: diff_file,
+                position: discussion.position.to_json,
+                click_to_comment: false },
+      layout: false,
+      formats: [:html]
+    )
+  end
 end

app/serializers/merge_request_widget_entity.rb

@@ -115,6 +115,14 @@ class MergeRequestWidgetEntity < IssuableEntity
     expose :can_cherry_pick_on_current_merge_request do |merge_request|
       presenter(merge_request).can_cherry_pick_on_current_merge_request?
     end
+
+    expose :can_create_note do |issue|
+      can?(request.current_user, :create_note, issue.project)
+    end
+
+    expose :can_update do |issue|
+      can?(request.current_user, :update_issue, issue)
+    end
   end
 
   # Paths
@@ -189,6 +197,10 @@ class MergeRequestWidgetEntity < IssuableEntity
     end
   end
 
+  expose :create_note_path do |merge_request|
+    project_notes_path(merge_request.project, target_type: 'merge_request', target_id: merge_request.id)
+  end
+
   expose :commit_change_content_path do |merge_request|
     commit_change_content_project_merge_request_path(merge_request.project, merge_request)
   end

app/serializers/note_entity.rb

@@ -23,6 +23,10 @@ class NoteEntity < API::Entities::Note
     end
   end
 
+  expose :resolved?, as: :resolved
+  expose :resolvable?, as: :resolvable
+  expose :resolved_by, using: NoteUserEntity
+
   expose :system_note_icon_name, if: -> (note, _) { note.system? } do |note|
     SystemNoteHelper.system_note_icon_name(note)
   end
@@ -53,6 +57,14 @@ class NoteEntity < API::Entities::Note
     end
   end
 
+  expose :resolve_path, if: -> (note, _) { note.part_of_discussion? && note.resolvable? } do |note|
+    resolve_project_merge_request_discussion_path(note.project, note.noteable, note.discussion_id)
+  end
+
+  expose :resolve_with_issue_path, if: -> (note, _) { note.part_of_discussion? && note.resolvable? } do |note|
+    new_project_issue_path(note.project, merge_request_to_resolve_discussions_of: note.noteable.iid, discussion_to_resolve: note.discussion_id)
+  end
+
   expose :attachment, using: NoteAttachmentEntity, if: -> (note, _) { note.attachment? }
   expose :delete_attachment_path, if: -> (note, _) { note.attachment? } do |note|
     delete_attachment_project_note_path(note.project, note)

app/views/projects/issues/_discussion.html.haml

@@ -6,14 +6,6 @@
     = link_to 'Close issue', issue_path(@issue, issue: {state_event: :close}, format: 'json'), data: {original_text: "Close issue", alternative_text: "Comment & close issue"}, class: "btn btn-nr btn-close btn-comment js-note-target-close #{issue_button_visibility(@issue, true)}", title: 'Close issue'
 
 %section.js-vue-notes-event
-  #js-vue-notes{ data: { discussions_path: discussions_project_issue_path(@project, @issue, format: :json),
-  register_path: new_session_path(:user, redirect_to_referer: 'yes', anchor: 'register-pane'),
-  new_session_path: new_session_path(:user, redirect_to_referer: 'yes'),
-  markdown_docs_path: help_page_path('user/markdown'),
-  quick_actions_docs_path: help_page_path('user/project/quick_actions'),
-  notes_path: notes_url,
-  close_issue_path: issue_path(@issue, issue: { state_event: :close }, format: 'json'),
-  reopen_issue_path: issue_path(@issue, issue: { state_event: :reopen }, format: 'json'),
-  last_fetched_at: Time.now.to_i,
+  #js-vue-notes{ data: { notes_data: notes_data(@issue),
     noteable_data: serialize_issuable(@issue),
     current_user_data: UserSerializer.new.represent(current_user, only_path: true).to_json } }

app/views/projects/issues/show.html.haml

@@ -73,7 +73,7 @@
 
   .content-block.emoji-block
     .row
-      .col-sm-8.js-issue-note-awards
+      .col-sm-8.js-noteable-awards
         = render 'award_emoji/awards_block', awardable: @issue, inline: true
       .col-sm-4.new-branch-col
         = render 'new_branch' unless @issue.confidential?

app/views/projects/merge_requests/show.html.haml

+- @gfm_form = true
 - @content_class = "limit-container-width" unless fluid_layout
 - add_to_breadcrumbs "Merge Requests", project_merge_requests_path(@project)
 - breadcrumb_title @merge_request.to_reference
@@ -7,6 +8,9 @@
 - content_for :page_specific_javascripts do
   = webpack_bundle_tag('common_vue')
 
+  - if has_vue_discussions_cookie?
+    = webpack_bundle_tag('mr_notes')
+
 .merge-request{ data: { mr_action: j(params[:tab].presence || 'show'), url: merge_request_path(@merge_request, format: :json), project_path: project_path(@merge_request.project) } }
   = render "projects/merge_requests/mr_title"
 
@@ -23,7 +27,7 @@
 
     #js-vue-mr-widget.mr-widget
 
-    .content-block.content-block-small.emoji-list-container
+    .content-block.content-block-small.emoji-list-container.js-noteable-awards
       = render 'award_emoji/awards_block', awardable: @merge_request, inline: true
 
     .merge-request-tabs-holder{ class: ("js-tabs-affix" unless ENV['RAILS_ENV'] == 'test') }
@@ -51,6 +55,10 @@
                 = tab_link_for @merge_request, :diffs do
                   Changes
                   %span.badge= @merge_request.diff_size
+
+        - if has_vue_discussions_cookie?
+          #js-vue-discussion-counter
+        - else
           #resolve-count-app.line-resolve-all-container.prepend-top-10{ "v-cloak" => true }
             %resolve-count{ "inline-template" => true, ":logged-out" => "#{current_user.nil?}" }
               %div
@@ -71,8 +79,13 @@
       #notes.notes.tab-pane.voting_notes
         .row
           %section.col-md-12
-            .issuable-discussion
+            %script.js-notes-data{ type: "application/json" }= initial_notes_data(true).to_json.html_safe
+            .issuable-discussion.js-vue-notes-event
               = render "projects/merge_requests/discussion"
+              - if has_vue_discussions_cookie?
+                #js-vue-mr-discussions{ data: { notes_data: notes_data(@merge_request),
+                  noteable_data: serialize_issuable(@merge_request),
+                  current_user_data: UserSerializer.new.represent(current_user).to_json} }
 
       #commits.commits.tab-pane
         -# This tab is always loaded via AJAX

app/views/shared/notes/_notes_with_form.html.haml

 - issuable = @issue || @merge_request
 - discussion_locked = issuable&.discussion_locked?
 
-%ul#notes-list.notes.main-notes-list.timeline
+- unless has_vue_discussions_cookie?
+  %ul#notes-list.notes.main-notes-list.timeline
     = render "shared/notes/notes"
 
 = render 'shared/notes/edit_form', project: @project
 
 - if can_create_note?
-  %ul.notes.notes-form.timeline
+  %ul.notes.notes-form.timeline{ :class => ('hidden' if has_vue_discussions_cookie?) }
     %li.timeline-entry
       .timeline-entry-inner
         .flash-container.timeline-content

config/routes/project.rb

@@ -103,6 +103,7 @@ constraints(ProjectUrlConstrainer.new) do
           post :toggle_subscription
           post :remove_wip
           post :assign_related_issues
+          get :discussions, format: :json
           post :rebase
 
           scope constraints: { format: nil }, action: :show do

config/webpack.config.js

@@ -52,6 +52,7 @@ function generateEntries() {
     help:                 './help/help.js',
     merge_conflicts:      './merge_conflicts/merge_conflicts_bundle.js',
     monitoring:           './monitoring/monitoring_bundle.js',
+    mr_notes:             './mr_notes/index.js',
     notebook_viewer:      './blob/notebook_viewer.js',
     pdf_viewer:           './blob/pdf_viewer.js',
     pipelines_details:    './pipelines/pipeline_details_bundle.js',
@@ -243,6 +244,7 @@ var config = {
         'groups',
         'merge_conflicts',
         'monitoring',
+        'mr_notes',
         'notebook_viewer',
         'pdf_viewer',
         'pipelines',

spec/controllers/projects/discussions_controller_spec.rb

@@ -71,6 +71,19 @@ describe Projects::DiscussionsController do
 
           expect(response).to have_gitlab_http_status(200)
         end
+
+        context "when vue_mr_discussions cookie is present" do
+          before do
+            allow(controller).to receive(:cookies).and_return(vue_mr_discussions: 'true')
+          end
+
+          it "renders discussion with serializer" do
+            expect_any_instance_of(DiscussionSerializer).to receive(:represent)
+              .with(instance_of(Discussion), { context: instance_of(described_class) })
+
+            post :resolve, request_params
+          end
+        end
       end
     end
   end
@@ -119,6 +132,19 @@ describe Projects::DiscussionsController do
 
           expect(response).to have_gitlab_http_status(200)
         end
+
+        context "when vue_mr_discussions cookie is present" do
+          before do
+            allow(controller).to receive(:cookies).and_return({ vue_mr_discussions: 'true' })
+          end
+
+          it "renders discussion with serializer" do
+            expect_any_instance_of(DiscussionSerializer).to receive(:represent)
+              .with(instance_of(Discussion), { context: instance_of(described_class) })
+
+            delete :unresolve, request_params
+          end
+        end
       end
     end
   end

spec/controllers/projects/issues_controller_spec.rb

@@ -974,7 +974,7 @@ describe Projects::IssuesController do
       it 'returns discussion json' do
         get :discussions, namespace_id: project.namespace, project_id: project, id: issue.iid
 
-        expect(json_response.first.keys).to match_array(%w[id reply_id expanded notes individual_note])
+        expect(json_response.first.keys).to match_array(%w[id reply_id expanded notes diff_discussion individual_note resolvable resolve_with_issue_path resolved])
       end
 
       context 'with cross-reference system note', :request_store do

spec/features/merge_request/user_posts_notes_spec.rb

@@ -144,7 +144,7 @@ describe 'Merge request > User posts notes', :js do
       end
     end
 
-    describe 'deleting an attachment' do
+    describe 'deleting attachment on legacy diff note' do
       before do
         find('.note').hover
 

spec/fixtures/api/schemas/entities/merge_request_widget.json

@@ -75,7 +75,9 @@
       "properties": {
         "can_remove_source_branch": { "type": "boolean" },
         "can_revert_on_current_merge_request": { "type": ["boolean", "null"] },
-        "can_cherry_pick_on_current_merge_request": { "type": ["boolean", "null"] }
+        "can_cherry_pick_on_current_merge_request": { "type": ["boolean", "null"] },
+        "can_create_note": { "type": "boolean" },
+        "can_update": { "type": "boolean" }
       },
       "additionalProperties": false
     },
@@ -103,6 +105,7 @@
     "merge_ongoing": { "type": "boolean" },
     "ff_only_enabled": { "type": ["boolean", false] },
     "should_be_rebased": { "type": "boolean" },
+    "create_note_path": { "type": ["string", "null"] },
     "rebase_commit_sha": { "type": ["string", "null"] },
     "rebase_in_progress": { "type": "boolean" },
     "can_push_to_source_branch": { "type": "boolean" },

spec/javascripts/autosave_spec.js

@@ -3,28 +3,24 @@ import AccessorUtilities from '~/lib/utils/accessor';
 
 describe('Autosave', () => {
   let autosave;
-
-  describe('class constructor', () => {
+  const field = $('<textarea></textarea>');
   const key = 'key';
-    const field = jasmine.createSpyObj('field', ['data', 'on']);
 
+  describe('class constructor', () => {
     beforeEach(() => {
       spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').and.returnValue(true);
       spyOn(Autosave.prototype, 'restore');
-
-      autosave = new Autosave(field, key);
     });
 
     it('should set .isLocalStorageAvailable', () => {
+      autosave = new Autosave(field, key);
+
       expect(AccessorUtilities.isLocalStorageAccessSafe).toHaveBeenCalled();
       expect(autosave.isLocalStorageAvailable).toBe(true);
     });
   });
 
   describe('restore', () => {
-    const key = 'key';
-    const field = jasmine.createSpyObj('field', ['trigger']);
-
     beforeEach(() => {
       autosave = {
         field,
@@ -49,24 +45,53 @@ describe('Autosave', () => {
     describe('if .isLocalStorageAvailable is `true`', () => {
       beforeEach(() => {
         autosave.isLocalStorageAvailable = true;
-
-        Autosave.prototype.restore.call(autosave);
       });
 
       it('should call .getItem', () => {
+        Autosave.prototype.restore.call(autosave);
+
         expect(window.localStorage.getItem).toHaveBeenCalledWith(key);
       });
+
+      it('triggers jquery event', () => {
+        spyOn(autosave.field, 'trigger').and.callThrough();
+
+        Autosave.prototype.restore.call(autosave);
+
+        expect(
+          field.trigger,
+        ).toHaveBeenCalled();
+      });
+
+      it('triggers native event', (done) => {
+        autosave.field.get(0).addEventListener('change', () => {
+          done();
+        });
+
+        Autosave.prototype.restore.call(autosave);
       });
     });
 
-  describe('save', () => {
-    const field = jasmine.createSpyObj('field', ['val']);
+    describe('if field gets deleted from DOM', () => {
+      beforeEach(() => {
+        autosave.field = $('.not-a-real-element');
+      });
+
+      it('does not trigger event', () => {
+        spyOn(field, 'trigger').and.callThrough();
 
+        expect(
+          field.trigger,
+        ).not.toHaveBeenCalled();
+      });
+    });
+  });
+
+  describe('save', () => {
     beforeEach(() => {
       autosave = jasmine.createSpyObj('autosave', ['reset']);
       autosave.field = field;
-
-      field.val.and.returnValue('value');
+      field.val('value');
 
       spyOn(window.localStorage, 'setItem');
     });
@@ -97,8 +122,6 @@ describe('Autosave', () => {
   });
 
   describe('reset', () => {
-    const key = 'key';
-
     beforeEach(() => {
       autosave = {
         key,

spec/javascripts/fixtures/merge_requests.rb

@@ -70,8 +70,50 @@ describe Projects::MergeRequestsController, '(JavaScript fixtures)', type: :cont
     render_merge_request(example.description, merge_request)
   end
 
+  it 'merge_requests/discussions.json' do |example|
+    create(:diff_note_on_merge_request, project: project, author: admin, position: position, noteable: merge_request)
+    render_discussions_json(merge_request, example.description)
+  end
+
+  it 'merge_requests/diff_discussion.json' do |example|
+    create(:diff_note_on_merge_request, project: project, author: admin, position: position, noteable: merge_request)
+    render_discussions_json(merge_request, example.description)
+  end
+
+  context 'with image diff' do
+    let(:merge_request2) { create(:merge_request_with_diffs, :with_image_diffs, source_project: project, title: "Added images") }
+    let(:image_path) { "files/images/ee_repo_logo.png" }
+    let(:image_position) do
+      Gitlab::Diff::Position.new(
+        old_path: image_path,
+        new_path: image_path,
+        width: 100,
+        height: 100,
+        x: 1,
+        y: 1,
+        position_type: "image",
+        diff_refs: merge_request2.diff_refs
+      )
+    end
+
+    it 'merge_requests/image_diff_discussion.json' do |example|
+      create(:diff_note_on_merge_request, project: project, noteable: merge_request2, position: image_position)
+      render_discussions_json(merge_request2, example.description)
+    end
+  end
+
   private
 
+  def render_discussions_json(merge_request, fixture_file_name)
+    get :discussions,
+      namespace_id: project.namespace.to_param,
+      project_id: project,
+      id: merge_request.to_param,
+      format: :json
+
+    store_frontend_fixture(response, fixture_file_name)
+  end
+
   def render_merge_request(fixture_file_name, merge_request)
     get :show,
       namespace_id: project.namespace.to_param,

spec/javascripts/notes/components/comment_form_spec.js

 import Vue from 'vue';
 import Autosize from 'autosize';
 import store from '~/notes/stores';
-import issueCommentForm from '~/notes/components/comment_form.vue';
+import CommentForm from '~/notes/components/comment_form.vue';
 import { loggedOutnoteableData, notesDataMock, userDataMock, noteableDataMock } from '../mock_data';
 import { keyboardDownEvent } from '../../issue_show/helpers';
 
 describe('issue_comment_form component', () => {
   let vm;
-  const Component = Vue.extend(issueCommentForm);
+  const Component = Vue.extend(CommentForm);
   let mountComponent;
 
   beforeEach(() => {
-    mountComponent = () => new Component({
+    mountComponent = (noteableType = 'issue') => new Component({
+      propsData: {
+        noteableType,
+      },
       store,
     }).$mount();
   });
@@ -136,6 +139,11 @@ describe('issue_comment_form component', () => {
 
           expect(vm.editCurrentUserLastNote).toHaveBeenCalled();
         });
+
+        it('inits autosave', () => {
+          expect(vm.autosave).toBeDefined();
+          expect(vm.autosave.key).toEqual(`autosave/Note/Issue/${noteableDataMock.id}`);
+        });
       });
 
       describe('event enter', () => {
@@ -182,6 +190,15 @@ describe('issue_comment_form component', () => {
           done();
         });
       });
+
+      it('updates button text with noteable type', (done) => {
+        vm.noteableType = 'merge_request';
+
+        Vue.nextTick(() => {
+          expect(vm.$el.querySelector('.btn-comment-and-close').textContent.trim()).toEqual('Close merge request');
+          done();
+        });
+      });
     });
 
     describe('issue is confidential', () => {

spec/javascripts/notes/components/diff_file_header_spec.js

+import Vue from 'vue';
+import DiffFileHeader from '~/notes/components/diff_file_header.vue';
+import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
+import mountComponent from '../../helpers/vue_mount_component_helper';
+
+const discussionFixture = 'merge_requests/diff_discussion.json';
+
+describe('diff_file_header', () => {
+  let vm;
+  const diffDiscussionMock = getJSONFixture(discussionFixture)[0];
+  const diffFile = convertObjectPropsToCamelCase(diffDiscussionMock.diff_file);
+  const props = {
+    diffFile,
+  };
+  const Component = Vue.extend(DiffFileHeader);
+  const selectors = {
+    get copyButton() {
+      return vm.$el.querySelector('button[data-original-title="Copy file path to clipboard"]');
+    },
+    get fileName() {
+      return vm.$el.querySelector('.file-title-name');
+    },
+    get titleWrapper() {
+      return vm.$refs.titleWrapper;
+    },
+  };
+
+  describe('submodule', () => {
+    beforeEach(() => {
+      props.diffFile.submodule = true;
+      props.diffFile.submoduleLink = '<a href="/bha">Submodule</a>';
+
+      vm = mountComponent(Component, props);
+    });
+
+    it('shows submoduleLink', () => {
+      expect(selectors.fileName.innerHTML).toBe(props.diffFile.submoduleLink);
+    });
+
+    it('has button to copy blob path', () => {
+      expect(selectors.copyButton).toExist();
+      expect(selectors.copyButton.getAttribute('data-clipboard-text')).toBe(props.diffFile.submoduleLink);
+    });
+  });
+
+  describe('changed file', () => {
+    beforeEach(() => {
+      props.diffFile.submodule = false;
+      props.diffFile.discussionPath = 'some/discussion/id';
+
+      vm = mountComponent(Component, props);
+    });
+
+    it('shows file type icon', () => {
+      expect(vm.$el.innerHTML).toContain('fa-file-text-o');
+    });
+
+    it('links to discussion path', () => {
+      expect(selectors.titleWrapper).toExist();
+      expect(selectors.titleWrapper.tagName).toBe('A');
+      expect(selectors.titleWrapper.getAttribute('href')).toBe(props.diffFile.discussionPath);
+    });
+
+    it('shows plain title if no link given', () => {
+      props.diffFile.discussionPath = undefined;
+      vm = mountComponent(Component, props);
+
+      expect(selectors.titleWrapper.tagName).not.toBe('A');
+      expect(selectors.titleWrapper.href).toBeFalsy();
+    });
+
+    it('has button to copy file path', () => {
+      expect(selectors.copyButton).toExist();
+      expect(selectors.copyButton.getAttribute('data-clipboard-text')).toBe(props.diffFile.filePath);
+    });
+
+    it('shows file mode change', (done) => {
+      vm.diffFile = {
+        ...props.diffFile,
+        modeChanged: true,
+        aMode: '100755',
+        bMode: '100644',
+      };
+
+      Vue.nextTick(() => {
+        expect(
+          vm.$refs.fileMode.textContent.trim(),
+        ).toBe('100755 → 100644');
+        done();
+      });
+    });
+  });
+});

spec/javascripts/notes/components/diff_with_note_spec.js

+import Vue from 'vue';
+import DiffWithNote from '~/notes/components/diff_with_note.vue';
+import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
+import mountComponent from '../../helpers/vue_mount_component_helper';
+
+const discussionFixture = 'merge_requests/diff_discussion.json';
+const imageDiscussionFixture = 'merge_requests/image_diff_discussion.json';
+
+describe('diff_with_note', () => {
+  let vm;
+  const diffDiscussionMock = getJSONFixture(discussionFixture)[0];
+  const diffDiscussion = convertObjectPropsToCamelCase(diffDiscussionMock);
+  const Component = Vue.extend(DiffWithNote);
+  const props = {
+    discussion: diffDiscussion,
+  };
+  const selectors = {
+    get container() {
+      return vm.$refs.fileHolder;
+    },
+    get diffTable() {
+      return this.container.querySelector('.diff-content table');
+    },
+    get diffRows() {
+      return this.container.querySelectorAll('.diff-content .line_holder');
+    },
+    get noteRow() {
+      return this.container.querySelector('.diff-content .notes_holder');
+    },
+  };
+
+  describe('text diff', () => {
+    beforeEach(() => {
+      vm = mountComponent(Component, props);
+    });
+
+    it('shows text diff', () => {
+      expect(selectors.container).toHaveClass('text-file');
+      expect(selectors.diffTable).toExist();
+    });
+
+    it('shows diff lines', () => {
+      expect(selectors.diffRows.length).toBe(12);
+    });
+
+    it('shows notes row', () => {
+      expect(selectors.noteRow).toExist();
+    });
+  });
+
+  describe('image diff', () => {
+    beforeEach(() => {
+      const imageDiffDiscussionMock = getJSONFixture(imageDiscussionFixture)[0];
+      props.discussion = convertObjectPropsToCamelCase(imageDiffDiscussionMock);
+    });
+
+    it('shows image diff', () => {
+      vm = mountComponent(Component, props);
+
+      expect(selectors.container).toHaveClass('js-image-file');
+      expect(selectors.diffTable).not.toExist();
+    });
+  });
+});

spec/javascripts/notes/components/note_app_spec.js

@@ -24,6 +24,7 @@ describe('note_app', () => {
 
   beforeEach(() => {
     jasmine.addMatchers(vueMatchers);
+    $('body').attr('data-page', 'projects:merge_requests:show');
 
     const IssueNotesApp = Vue.extend(notesApp);
 
@@ -119,8 +120,8 @@ describe('note_app', () => {
       vm = mountComponent();
     });
 
-    it('should render loading icon', () => {
-      expect(vm).toIncludeElement('.js-loading');
+    it('renders skeleton notes', () => {
+      expect(vm).toIncludeElement('.animation-container');
     });
 
     it('should render form', () => {

spec/javascripts/notes/components/note_body_spec.js

@@ -30,17 +30,26 @@ describe('issue_note_body component', () => {
     expect(vm.$el.querySelector('.note-text').innerHTML).toEqual(note.note_html);
   });
 
-  it('should be render form if user is editing', (done) => {
-    vm.isEditing = true;
+  it('should render awards list', () => {
+    expect(vm.$el.querySelector('.js-awards-block button [data-name="baseball"]')).not.toBeNull();
+    expect(vm.$el.querySelector('.js-awards-block button [data-name="bath_tone3"]')).not.toBeNull();
+  });
 
-    Vue.nextTick(() => {
-      expect(vm.$el.querySelector('textarea.js-task-list-field')).toBeDefined();
-      done();
+  describe('isEditing', () => {
+    beforeEach((done) => {
+      vm.isEditing = true;
+      Vue.nextTick(done);
     });
+
+    it('renders edit form', () => {
+      expect(vm.$el.querySelector('textarea.js-task-list-field')).not.toBeNull();
     });
 
-  it('should render awards list', () => {
-    expect(vm.$el.querySelector('.js-awards-block button [data-name="baseball"]')).toBeDefined();
-    expect(vm.$el.querySelector('.js-awards-block button [data-name="bath_tone3"]')).toBeDefined();
+    it('adds autosave', () => {
+      const autosaveKey = `autosave/Note/${note.noteable_type}/${note.id}`;
+
+      expect(vm.autosave).toExist();
+      expect(vm.autosave.key).toEqual(autosaveKey);
+    });
   });
 });

spec/javascripts/notes/components/note_header_spec.js

@@ -32,6 +32,7 @@ describe('note_header component', () => {
           createdAt: '2017-08-02T10:51:58.559Z',
           includeToggle: false,
           noteId: 1394,
+          expanded: true,
         },
       }).$mount();
     });
@@ -68,6 +69,7 @@ describe('note_header component', () => {
           createdAt: '2017-08-02T10:51:58.559Z',
           includeToggle: true,
           noteId: 1395,
+          expanded: true,
         },
       }).$mount();
     });
@@ -76,17 +78,35 @@ describe('note_header component', () => {
       expect(vm.$el.querySelector('.js-vue-toggle-button')).toBeDefined();
     });
 
-    it('should toggle the disucssion icon', (done) => {
-      expect(
-        vm.$el.querySelector('.js-vue-toggle-button i').classList.contains('fa-chevron-up'),
-      ).toEqual(true);
+    it('emits toggle event on click', (done) => {
+      spyOn(vm, '$emit');
 
       vm.$el.querySelector('.js-vue-toggle-button').click();
 
+      Vue.nextTick(() => {
+        expect(vm.$emit).toHaveBeenCalledWith('toggleHandler');
+        done();
+      });
+    });
+
+    it('renders up arrow when open', (done) => {
+      vm.expanded = true;
+
+      Vue.nextTick(() => {
+        expect(
+          vm.$el.querySelector('.js-vue-toggle-button i').classList,
+        ).toContain('fa-chevron-up');
+        done();
+      });
+    });
+
+    it('renders down arrow when closed', (done) => {
+      vm.expanded = false;
+
       Vue.nextTick(() => {
         expect(
-          vm.$el.querySelector('.js-vue-toggle-button i').classList.contains('fa-chevron-down'),
-        ).toEqual(true);
+          vm.$el.querySelector('.js-vue-toggle-button i').classList,
+        ).toContain('fa-chevron-down');
         done();
       });
     });

spec/javascripts/notes/mock_data.js

@@ -7,8 +7,9 @@ export const notesDataMock = {
   notesPath: '/gitlab-org/gitlab-ce/noteable/issue/98/notes',
   quickActionsDocsPath: '/help/user/project/quick_actions',
   registerPath: '/users/sign_in?redirect_to_referer=yes#register-pane',
-  closeIssuePath: '/twitter/flight/issues/9.json?issue%5Bstate_event%5D=close',
-  reopenIssuePath: '/twitter/flight/issues/9.json?issue%5Bstate_event%5D=reopen',
+  totalNotes: 1,
+  closePath: '/twitter/flight/issues/9.json?issue%5Bstate_event%5D=close',
+  reopenPath: '/twitter/flight/issues/9.json?issue%5Bstate_event%5D=reopen',
 };
 
 export const userDataMock = {

spec/javascripts/notes/stores/getters_spec.js

@@ -56,9 +56,9 @@ describe('Getters Notes Store', () => {
     });
   });
 
-  describe('issueState', () => {
+  describe('openState', () => {
     it('should return the issue state', () => {
-      expect(getters.issueState(state)).toEqual(noteableDataMock.state);
+      expect(getters.openState(state)).toEqual(noteableDataMock.state);
     });
   });
 });

spec/javascripts/notes/stores/mutation_spec.js

 import mutations from '~/notes/stores/mutations';
 import { note, discussionMock, notesDataMock, userDataMock, noteableDataMock, individualNote } from '../mock_data';
 
-describe('Mutation Notes Store', () => {
+describe('Notes Store mutations', () => {
   describe('ADD_NEW_NOTE', () => {
     let state;
     let noteData;
@@ -103,7 +103,8 @@ describe('Mutation Notes Store', () => {
       };
 
       mutations.SET_INITIAL_NOTES(state, [note]);
-      expect(state.notes).toEqual([note]);
+      expect(state.notes[0].id).toEqual(note.id);
+      expect(state.notes.length).toEqual(1);
     });
   });
 

spec/javascripts/notes_spec.js

@@ -34,6 +34,7 @@ import timeoutPromise from './helpers/set_timeout_promise_helper';
 
   describe('Notes', function() {
     const FLASH_TYPE_ALERT = 'alert';
+    const NOTES_POST_PATH = /(.*)\/notes\?html=true$/;
     var commentsTemplate = 'merge_requests/merge_request_with_comment.html.raw';
     preloadFixtures(commentsTemplate);
 
@@ -154,7 +155,7 @@ import timeoutPromise from './helpers/set_timeout_promise_helper';
         $form.find('textarea.js-note-text').val(sampleComment);
 
         mock = new MockAdapter(axios);
-        mock.onPost(/(.*)\/notes$/).reply(200, noteEntity);
+        mock.onPost(NOTES_POST_PATH).reply(200, noteEntity);
       });
 
       afterEach(() => {
@@ -506,11 +507,11 @@ import timeoutPromise from './helpers/set_timeout_promise_helper';
       let mock;
 
       function mockNotesPost() {
-        mock.onPost(/(.*)\/notes$/).reply(200, note);
+        mock.onPost(NOTES_POST_PATH).reply(200, note);
       }
 
       function mockNotesPostError() {
-        mock.onPost(/(.*)\/notes$/).networkError();
+        mock.onPost(NOTES_POST_PATH).networkError();
       }
 
       beforeEach(() => {
@@ -631,7 +632,7 @@ import timeoutPromise from './helpers/set_timeout_promise_helper';
 
       beforeEach(() => {
         mock = new MockAdapter(axios);
-        mock.onPost(/(.*)\/notes$/).reply(200, note);
+        mock.onPost(NOTES_POST_PATH).reply(200, note);
 
         this.notes = new Notes('', []);
         window.gon.current_username = 'root';
@@ -684,7 +685,7 @@ import timeoutPromise from './helpers/set_timeout_promise_helper';
 
       beforeEach(() => {
         mock = new MockAdapter(axios);
-        mock.onPost(/(.*)\/notes$/).reply(200, note);
+        mock.onPost(NOTES_POST_PATH).reply(200, note);
 
         this.notes = new Notes('', []);
         window.gon.current_username = 'root';

spec/serializers/diff_file_entity_spec.rb

+require 'spec_helper'
+
+describe DiffFileEntity do
+  include RepoHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:repository) { project.repository }
+  let(:commit) { project.commit(sample_commit.id) }
+  let(:diff_refs) { commit.diff_refs }
+  let(:diff) { commit.raw_diffs.first }
+  let(:diff_file) { Gitlab::Diff::File.new(diff, diff_refs: diff_refs, repository: repository) }
+  let(:entity) { described_class.new(diff_file) }
+
+  subject { entity.as_json }
+
+  it 'exposes correct attributes' do
+    expect(subject).to include(
+      :submodule, :submodule_link, :file_path,
+      :deleted_file, :old_path, :new_path, :mode_changed,
+      :a_mode, :b_mode, :text, :old_path_html,
+      :new_path_html
+    )
+  end
+end

spec/serializers/discussion_entity_spec.rb

+require 'spec_helper'
+
+describe DiscussionEntity do
+  include RepoHelpers
+
+  let(:user) { create(:user) }
+  let(:note) { create(:discussion_note_on_merge_request) }
+  let(:discussion) { note.discussion }
+  let(:request) { double('request') }
+  let(:controller) { double('controller') }
+  let(:entity) { described_class.new(discussion, request: request, context: controller) }
+
+  subject { entity.as_json }
+
+  before do
+    allow(controller).to receive(:render_to_string)
+    allow(request).to receive(:current_user).and_return(user)
+    allow(request).to receive(:noteable).and_return(note.noteable)
+  end
+
+  it 'exposes correct attributes' do
+    expect(subject).to include(
+      :id, :expanded, :notes, :individual_note,
+      :resolvable, :resolved, :resolve_path,
+      :resolve_with_issue_path, :diff_discussion
+    )
+  end
+
+  context 'when diff file is present' do
+    let(:note) { create(:diff_note_on_merge_request) }
+
+    it 'exposes diff file attributes' do
+      expect(subject).to include(:diff_file, :truncated_diff_lines, :image_diff_html)
+    end
+  end
+end

spec/serializers/note_entity_spec.rb

@@ -48,4 +48,15 @@ describe NoteEntity do
       expect(subject).to include(:system_note_icon_name)
     end
   end
+
+  context 'when note is part of resolvable discussion' do
+    before do
+      allow(note).to receive(:part_of_discussion?).and_return(true)
+      allow(note).to receive(:resolvable?).and_return(true)
+    end
+
+    it 'exposes paths to resolve note' do
+      expect(subject).to include(:resolve_path, :resolve_with_issue_path)
+    end
+  end
 end