Declare Vue as global per file, not eslintrc.

.eslintrc

@@ -9,8 +9,7 @@
     "_": false,
     "gl": false,
     "gon": false,
-    "localStorage": false,
-    "Vue": false
+    "localStorage": false
   },
   "plugins": [
     "filenames"

app/assets/javascripts/issuable/time_tracking/components/collapsed_state.js.es6

+/* global Vue */
 //= require lib/utils/pretty_time
 
 (() => {

app/assets/javascripts/issuable/time_tracking/components/comparison_pane.js.es6

+/* global Vue */
 //= require lib/utils/pretty_time
 
 (() => {

app/assets/javascripts/issuable/time_tracking/components/estimate_only_pane.js.es6

+/* global Vue */
 (() => {
   Vue.component('time-tracking-estimate-only-pane', {
     name: 'time-tracking-estimate-only-pane',

app/assets/javascripts/issuable/time_tracking/components/help_state.js.es6

+/* global Vue */
 (() => {
   Vue.component('time-tracking-help-state', {
     name: 'time-tracking-help-state',

app/assets/javascripts/issuable/time_tracking/components/no_tracking_pane.js.es6

+/* global Vue */
 (() => {
   Vue.component('time-tracking-no-tracking-pane', {
     name: 'time-tracking-no-tracking-pane',

app/assets/javascripts/issuable/time_tracking/components/spent_only_pane.js.es6

+/* global Vue */
 (() => {
   Vue.component('time-tracking-spent-only-pane', {
     name: 'time-tracking-spent-only-pane',

app/assets/javascripts/issuable/time_tracking/components/time_tracker.js.es6

+/* global Vue */
 //= require ./help_state
 //= require ./collapsed_state
 //= require ./spent_only_pane

app/assets/javascripts/issuable/time_tracking/time_tracking_bundle.js.es6

+/* global Vue */
 //= require ./components/time_tracker
 //= require smart_interval
 //= require subbable_resource