Remove unused common utilities

This removes the unused common utils:

- ajaxGet
- nodeMatchesSelector
- normalizeCRLFHeaders
- setFavicon

This was discovered when searching for IE11 polyfills.

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

@@ -53,16 +53,6 @@ export const getCspNonceValue = () => {
   return metaTag && metaTag.content;
 };
 
-export const ajaxGet = url =>
-  axios
-    .get(url, {
-      params: { format: 'js' },
-      responseType: 'text',
-    })
-    .then(({ data }) => {
-      $.globalEval(data, { nonce: getCspNonceValue() });
-    });
-
 export const rstrip = val => {
   if (val) {
     return val.replace(/\s+$/, '');
@@ -375,34 +365,6 @@ export const insertText = (target, text) => {
   target.dispatchEvent(event);
 };
 
-export const nodeMatchesSelector = (node, selector) => {
-  const matches =
-    Element.prototype.matches ||
-    Element.prototype.matchesSelector ||
-    Element.prototype.mozMatchesSelector ||
-    Element.prototype.msMatchesSelector ||
-    Element.prototype.oMatchesSelector ||
-    Element.prototype.webkitMatchesSelector;
-
-  if (matches) {
-    return matches.call(node, selector);
-  }
-
-  // IE11 doesn't support `node.matches(selector)`
-
-  let { parentNode } = node;
-
-  if (!parentNode) {
-    parentNode = document.createElement('div');
-    // eslint-disable-next-line no-param-reassign
-    node = node.cloneNode(true);
-    parentNode.appendChild(node);
-  }
-
-  const matchingNodes = parentNode.querySelectorAll(selector);
-  return Array.prototype.indexOf.call(matchingNodes, node) !== -1;
-};
-
 /**
   this will take in the headers from an API response and normalize them
   this way we don't run into production issues when nginx gives us lowercased header keys
@@ -417,24 +379,6 @@ export const normalizeHeaders = headers => {
   return upperCaseHeaders;
 };
 
-/**
-  this will take in the getAllResponseHeaders result and normalize them
-  this way we don't run into production issues when nginx gives us lowercased header keys
-*/
-export const normalizeCRLFHeaders = headers => {
-  const headersObject = {};
-  const headersArray = headers.split('\n');
-
-  headersArray.forEach(header => {
-    const keyValue = header.split(': ');
-
-    // eslint-disable-next-line prefer-destructuring
-    headersObject[keyValue[0]] = keyValue[1];
-  });
-
-  return normalizeHeaders(headersObject);
-};
-
 /**
  * Parses pagination object string values into numbers.
  *
@@ -643,13 +587,6 @@ export const setFaviconOverlay = overlayPath => {
   );
 };
 
-export const setFavicon = faviconPath => {
-  const faviconEl = document.getElementById('favicon');
-  if (faviconEl && faviconPath) {
-    faviconEl.setAttribute('href', faviconPath);
-  }
-};
-
 export const resetFavicon = () => {
   const faviconEl = document.getElementById('favicon');
 

spec/frontend/lib/utils/common_utils_spec.js

@@ -330,32 +330,6 @@ describe('common_utils', () => {
     });
   });
 
-  describe('normalizeCRLFHeaders', () => {
-    const testContext = {};
-    beforeEach(() => {
-      testContext.CLRFHeaders =
-        'a-header: a-value\nAnother-Header: ANOTHER-VALUE\nLaSt-HeAdEr: last-VALUE';
-      jest.spyOn(String.prototype, 'split');
-      testContext.normalizeCRLFHeaders = commonUtils.normalizeCRLFHeaders(testContext.CLRFHeaders);
-    });
-
-    it('should split by newline', () => {
-      expect(String.prototype.split).toHaveBeenCalledWith('\n');
-    });
-
-    it('should split by colon+space for each header', () => {
-      expect(String.prototype.split.mock.calls.filter(args => args[0] === ': ').length).toBe(3);
-    });
-
-    it('should return a normalized headers object', () => {
-      expect(testContext.normalizeCRLFHeaders).toEqual({
-        'A-HEADER': 'a-value',
-        'ANOTHER-HEADER': 'ANOTHER-VALUE',
-        'LAST-HEADER': 'last-VALUE',
-      });
-    });
-  });
-
   describe('parseIntPagination', () => {
     it('should parse to integers all string values and return pagination object', () => {
       const pagination = {
@@ -510,27 +484,6 @@ describe('common_utils', () => {
     });
   });
 
-  describe('setFavicon', () => {
-    beforeEach(() => {
-      const favicon = document.createElement('link');
-      favicon.setAttribute('id', 'favicon');
-      favicon.setAttribute('href', 'default/favicon');
-      favicon.setAttribute('data-default-href', 'default/favicon');
-      document.body.appendChild(favicon);
-    });
-
-    afterEach(() => {
-      document.body.removeChild(document.getElementById('favicon'));
-    });
-
-    it('should set page favicon to provided favicon', () => {
-      const faviconPath = '//custom_favicon';
-      commonUtils.setFavicon(faviconPath);
-
-      expect(document.getElementById('favicon').getAttribute('href')).toEqual(faviconPath);
-    });
-  });
-
   describe('resetFavicon', () => {
     beforeEach(() => {
       const favicon = document.createElement('link');