Merge branch 'clean-no-undef' into 'master'

Explicitly declare all javascript globals and all eslint rule violations

This merge request takes every single external global variable referenced within a javascript file and explicitly marks it with a `/* global Foo */` comment block at the top of the script.

This also expands all blanket instances of `/* eslint-disable */` with an explicit list of disabled rules.  This is useful because if we need to search for violations of a particular rule we can simply grep the codebase for something like `no-unused-vars` or `semi` and find all of the places where this rule has yet to be fixed.

Lastly, it also removes and resolves any existing `no-undef` eslint violations.  This is useful for catching mistakes like forgetting to declare a variable with `var`/`let`/`const` which can cause hard to find bugs.

## What does this MR do?

1. Looks for generic uses of `/* eslint-disable */` and refactors them into individual rule exceptions.
2. Looks for all occurrences of `/* eslint-disable ... no-undef */` and resolves them by either fixing bugs or declaring globals with `/* global Foo */`.

## Are there points in the code the reviewer needs to double check?

This touches a lot of files, most changes touch nothing other than comment blocks or whitespace.  The exceptions are the following 14 files which required some small bug fixes after removing `no-undef`:

- api.js
- breakpoints.js
- build.js
- commits.js
- diff_notes/components/jump_to_discussion.js.es6
- gfm_auto_complete.js.es6
- gl_dropdown.js
- groups_select.js
- importer_status.js
- namespace_select.js
- notes.js
- preview_markdown.js
- projects_list.js
- single_file_diff.js

## Why was this MR needed?

Removal of ~"technical debt" and some necessary changes to help !7288 

## Screenshots (if relevant)

N/A

## Does this MR meet the acceptance criteria?

- [ ] ~~[Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added~~
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- Tests
  - [ ] ~~Added for this feature/bug~~
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

N/A

See merge request !8043

29 files changed, 86 insertions, 31 deletions

diff --git a/spec/javascripts/abuse_reports_spec.js.es6 b/spec/javascripts/abuse_reports_spec.js.es6
index a3171353bfb..9e94c9d1d74 100644
--- a/spec/javascripts/abuse_reports_spec.js.es6
+++ b/spec/javascripts/abuse_reports_spec.js.es6
@@ -1,6 +1,6 @@
-/* eslint-disable */
-/*= require abuse_reports */
+/* eslint-disable space-before-function-paren, no-new, padded-blocks */
 
+/*= require abuse_reports */
 /*= require jquery */
 
 ((global) => {
diff --git a/spec/javascripts/activities_spec.js.es6 b/spec/javascripts/activities_spec.js.es6
index 8640cd44085..192da4ee8d9 100644
--- a/spec/javascripts/activities_spec.js.es6
+++ b/spec/javascripts/activities_spec.js.es6
@@ -1,4 +1,5 @@
-/* eslint-disable */
+/* eslint-disable no-unused-expressions, comma-spacing, prefer-const, no-prototype-builtins, semi, no-new, keyword-spacing, no-plusplus, no-shadow, max-len */
+
 /*= require js.cookie.js */
 /*= require jquery.endless-scroll.js */
 /*= require pager */
diff --git a/spec/javascripts/awards_handler_spec.js b/spec/javascripts/awards_handler_spec.js
index 7b2e3db6218..89201c8cb8b 100644
--- a/spec/javascripts/awards_handler_spec.js
+++ b/spec/javascripts/awards_handler_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, no-unused-expressions, comma-dangle, no-undef, new-parens, no-unused-vars, quotes, jasmine/no-spec-dupes, prefer-template, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, no-unused-expressions, comma-dangle, new-parens, no-unused-vars, quotes, jasmine/no-spec-dupes, prefer-template, padded-blocks, max-len */
+/* global AwardsHandler */
 
 /*= require awards_handler */
 /*= require jquery */
diff --git a/spec/javascripts/behaviors/quick_submit_spec.js b/spec/javascripts/behaviors/quick_submit_spec.js
index efb1203eb2f..0f61000bc37 100644
--- a/spec/javascripts/behaviors/quick_submit_spec.js
+++ b/spec/javascripts/behaviors/quick_submit_spec.js
@@ -1,4 +1,4 @@
-/* eslint-disable space-before-function-paren, no-var, no-return-assign, comma-dangle, no-undef, jasmine/no-spec-dupes, new-cap, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, no-return-assign, comma-dangle, jasmine/no-spec-dupes, new-cap, padded-blocks, max-len */
 
 /*= require behaviors/quick_submit */
 
diff --git a/spec/javascripts/boards/boards_store_spec.js.es6 b/spec/javascripts/boards/boards_store_spec.js.es6
index b84dfc8197b..b3a1afa28a5 100644
--- a/spec/javascripts/boards/boards_store_spec.js.es6
+++ b/spec/javascripts/boards/boards_store_spec.js.es6
@@ -1,4 +1,11 @@
-/* eslint-disable */
+/* eslint-disable comma-dangle, one-var, no-unused-vars, indent */
+/* global Vue */
+/* global BoardService */
+/* global boardsMockInterceptor */
+/* global Cookies */
+/* global listObj */
+/* global listObjDuplicate */
+
 //= require jquery
 //= require jquery_ujs
 //= require js.cookie
diff --git a/spec/javascripts/boards/issue_spec.js.es6 b/spec/javascripts/boards/issue_spec.js.es6
index 90cb8926545..c8a61a0a9b5 100644
--- a/spec/javascripts/boards/issue_spec.js.es6
+++ b/spec/javascripts/boards/issue_spec.js.es6
@@ -1,4 +1,7 @@
-/* eslint-disable */
+/* eslint-disable comma-dangle */
+/* global BoardService */
+/* global ListIssue */
+
 //= require jquery
 //= require jquery_ujs
 //= require js.cookie
diff --git a/spec/javascripts/boards/list_spec.js.es6 b/spec/javascripts/boards/list_spec.js.es6
index dfbcbe3a7c1..7d942ec3d65 100644
--- a/spec/javascripts/boards/list_spec.js.es6
+++ b/spec/javascripts/boards/list_spec.js.es6
@@ -1,4 +1,10 @@
-/* eslint-disable */
+/* eslint-disable comma-dangle */
+/* global Vue */
+/* global boardsMockInterceptor */
+/* global BoardService */
+/* global List */
+/* global listObj */
+
 //= require jquery
 //= require jquery_ujs
 //= require js.cookie
diff --git a/spec/javascripts/boards/mock_data.js.es6 b/spec/javascripts/boards/mock_data.js.es6
index fcb3d8f17d8..8d3e2237fda 100644
--- a/spec/javascripts/boards/mock_data.js.es6
+++ b/spec/javascripts/boards/mock_data.js.es6
@@ -1,4 +1,5 @@
-/* eslint-disable */
+/* eslint-disable comma-dangle, no-unused-vars, quote-props */
+
 const listObj = {
   id: 1,
   position: 0,
diff --git a/spec/javascripts/dashboard_spec.js.es6 b/spec/javascripts/dashboard_spec.js.es6
index 93f73fa0e9a..aadf6f518a8 100644
--- a/spec/javascripts/dashboard_spec.js.es6
+++ b/spec/javascripts/dashboard_spec.js.es6
@@ -1,4 +1,5 @@
-/* eslint-disable */
+/* eslint-disable no-new, padded-blocks */
+
 /*= require sidebar */
 /*= require jquery */
 /*= require js.cookie */
diff --git a/spec/javascripts/datetime_utility_spec.js.es6 b/spec/javascripts/datetime_utility_spec.js.es6
index 9fdbab3a9e9..8ece24555c5 100644
--- a/spec/javascripts/datetime_utility_spec.js.es6
+++ b/spec/javascripts/datetime_utility_spec.js.es6
@@ -1,5 +1,5 @@
-/* eslint-disable */
 //= require lib/utils/datetime_utility
+
 (() => {
   describe('Date time utils', () => {
     describe('get day name', () => {
diff --git a/spec/javascripts/diff_comments_store_spec.js.es6 b/spec/javascripts/diff_comments_store_spec.js.es6
index 9b2845af608..18805d26ac0 100644
--- a/spec/javascripts/diff_comments_store_spec.js.es6
+++ b/spec/javascripts/diff_comments_store_spec.js.es6
@@ -1,8 +1,11 @@
-/* eslint-disable */
+/* eslint-disable no-extra-semi, jasmine/no-global-setup, dot-notation, jasmine/no-expect-in-setup-teardown, max-len */
+/* global CommentsStore */
+
 //= require vue
 //= require diff_notes/models/discussion
 //= require diff_notes/models/note
 //= require diff_notes/stores/comments
+
 (() => {
   function createDiscussion(noteId = 1, resolved = true) {
     CommentsStore.create('a', noteId, true, resolved, 'test');
diff --git a/spec/javascripts/gl_dropdown_spec.js.es6 b/spec/javascripts/gl_dropdown_spec.js.es6
index 8ba238018cd..bfaf90e2aee 100644
--- a/spec/javascripts/gl_dropdown_spec.js.es6
+++ b/spec/javascripts/gl_dropdown_spec.js.es6
@@ -1,4 +1,6 @@
-/* eslint-disable */
+/* eslint-disable comma-dangle, prefer-const, no-param-reassign, no-plusplus, semi, no-unused-expressions, arrow-spacing, max-len */
+/* global Turbolinks */
+
 /*= require jquery */
 /*= require gl_dropdown */
 /*= require turbolinks */
diff --git a/spec/javascripts/gl_field_errors_spec.js.es6 b/spec/javascripts/gl_field_errors_spec.js.es6
index 0713e30e485..5018e87ad6c 100644
--- a/spec/javascripts/gl_field_errors_spec.js.es6
+++ b/spec/javascripts/gl_field_errors_spec.js.es6
@@ -1,4 +1,5 @@
-/* eslint-disable */
+/* eslint-disable space-before-function-paren, arrow-body-style, indent, padded-blocks */
+
 //= require jquery
 //= require gl_field_errors
 
diff --git a/spec/javascripts/graphs/stat_graph_contributors_graph_spec.js b/spec/javascripts/graphs/stat_graph_contributors_graph_spec.js
index a406e6cc36a..bc5cbeb6a40 100644
--- a/spec/javascripts/graphs/stat_graph_contributors_graph_spec.js
+++ b/spec/javascripts/graphs/stat_graph_contributors_graph_spec.js
@@ -1,4 +1,8 @@
-/* eslint-disable quotes, no-undef, indent, semi, object-curly-spacing, jasmine/no-suite-dupes, vars-on-top, no-var, padded-blocks, spaced-comment, max-len */
+/* eslint-disable quotes, indent, semi, object-curly-spacing, jasmine/no-suite-dupes, vars-on-top, no-var, padded-blocks, spaced-comment, max-len */
+/* global d3 */
+/* global ContributorsGraph */
+/* global ContributorsMasterGraph */
+
 //= require graphs/stat_graph_contributors_graph
 
 describe("ContributorsGraph", function () {
diff --git a/spec/javascripts/graphs/stat_graph_contributors_util_spec.js b/spec/javascripts/graphs/stat_graph_contributors_util_spec.js
index 96f39abe13e..751f3d175e2 100644
--- a/spec/javascripts/graphs/stat_graph_contributors_util_spec.js
+++ b/spec/javascripts/graphs/stat_graph_contributors_util_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable quotes, padded-blocks, no-var, camelcase, object-curly-spacing, semi, indent, object-property-newline, comma-dangle, comma-spacing, no-undef, spaced-comment, max-len, key-spacing, vars-on-top, quote-props, no-multi-spaces, max-len */
+/* eslint-disable quotes, padded-blocks, no-var, camelcase, object-curly-spacing, semi, indent, object-property-newline, comma-dangle, comma-spacing, spaced-comment, max-len, key-spacing, vars-on-top, quote-props, no-multi-spaces */
+/* global ContributorsStatGraphUtil */
+
 //= require graphs/stat_graph_contributors_util
 
 describe("ContributorsStatGraphUtil", function () {
diff --git a/spec/javascripts/graphs/stat_graph_spec.js b/spec/javascripts/graphs/stat_graph_spec.js
index f78573b992b..0da124632ae 100644
--- a/spec/javascripts/graphs/stat_graph_spec.js
+++ b/spec/javascripts/graphs/stat_graph_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable quotes, padded-blocks, no-undef, semi */
+/* eslint-disable quotes, padded-blocks, semi */
+/* global StatGraph */
+
 //= require graphs/stat_graph
 
 describe("StatGraph", function () {
diff --git a/spec/javascripts/issue_spec.js b/spec/javascripts/issue_spec.js
index 14af6644de1..faab5ae00c2 100644
--- a/spec/javascripts/issue_spec.js
+++ b/spec/javascripts/issue_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, no-use-before-define, indent, no-undef, no-trailing-spaces, comma-dangle, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, no-use-before-define, indent, no-trailing-spaces, comma-dangle, padded-blocks, max-len */
+/* global Issue */
 
 /*= require lib/utils/text_utility */
 /*= require issue */
@@ -70,7 +71,7 @@
         $('input[type=checkbox]').attr('checked', true).trigger('change');
         expect($('.js-task-list-field').val()).toBe('- [x] Task List Item');
       });
-      
+
       it('submits an ajax request on tasklist:changed', function() {
         spyOn(jQuery, 'ajax').and.callFake(function(req) {
           expect(req.type).toBe('PATCH');
diff --git a/spec/javascripts/labels_issue_sidebar_spec.js.es6 b/spec/javascripts/labels_issue_sidebar_spec.js.es6
index 49687048eb5..0c48d04776f 100644
--- a/spec/javascripts/labels_issue_sidebar_spec.js.es6
+++ b/spec/javascripts/labels_issue_sidebar_spec.js.es6
@@ -1,4 +1,7 @@
-/* eslint-disable */
+/* eslint-disable no-new, no-plusplus, object-curly-spacing, prefer-const, semi */
+/* global IssuableContext */
+/* global LabelsSelect */
+
 //= require lib/utils/type_utility
 //= require jquery
 //= require bootstrap
diff --git a/spec/javascripts/line_highlighter_spec.js b/spec/javascripts/line_highlighter_spec.js
index b8b174a2e53..decdf583410 100644
--- a/spec/javascripts/line_highlighter_spec.js
+++ b/spec/javascripts/line_highlighter_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-var, no-param-reassign, quotes, prefer-template, no-else-return, new-cap, dot-notation, no-undef, no-return-assign, comma-dangle, no-new, one-var, one-var-declaration-per-line, no-plusplus, jasmine/no-spec-dupes, no-underscore-dangle, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, no-param-reassign, quotes, prefer-template, no-else-return, new-cap, dot-notation, no-return-assign, comma-dangle, no-new, one-var, one-var-declaration-per-line, no-plusplus, jasmine/no-spec-dupes, no-underscore-dangle, padded-blocks, max-len */
+/* global LineHighlighter */
 
 /*= require line_highlighter */
 
diff --git a/spec/javascripts/merge_request_spec.js b/spec/javascripts/merge_request_spec.js
index cbe2634d3a4..4cf1693af1b 100644
--- a/spec/javascripts/merge_request_spec.js
+++ b/spec/javascripts/merge_request_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-return-assign, no-undef, padded-blocks */
+/* eslint-disable space-before-function-paren, no-return-assign, padded-blocks */
+/* global MergeRequest */
 
 /*= require merge_request */
 
diff --git a/spec/javascripts/new_branch_spec.js b/spec/javascripts/new_branch_spec.js
index 8828970d984..a6cb9e47744 100644
--- a/spec/javascripts/new_branch_spec.js
+++ b/spec/javascripts/new_branch_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, one-var, no-var, one-var-declaration-per-line, no-return-assign, no-undef, quotes, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, one-var, no-var, one-var-declaration-per-line, no-return-assign, quotes, padded-blocks, max-len */
+/* global NewBranchForm */
 
 /*= require jquery-ui/autocomplete */
 /*= require new_branch_form */
diff --git a/spec/javascripts/notes_spec.js b/spec/javascripts/notes_spec.js
index 2db182d702b..d3bfa7730fa 100644
--- a/spec/javascripts/notes_spec.js
+++ b/spec/javascripts/notes_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable space-before-function-paren, no-unused-expressions, no-undef, no-var, object-shorthand, comma-dangle, semi, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-unused-expressions, no-var, object-shorthand, comma-dangle, semi, padded-blocks, max-len */
+/* global Notes */
+
 /*= require notes */
 /*= require autosize */
 /*= require gl_form */
diff --git a/spec/javascripts/project_title_spec.js b/spec/javascripts/project_title_spec.js
index 65de1756201..bb802a4b5e3 100644
--- a/spec/javascripts/project_title_spec.js
+++ b/spec/javascripts/project_title_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable space-before-function-paren, no-unused-expressions, no-return-assign, no-undef, no-param-reassign, no-var, new-cap, wrap-iife, no-unused-vars, quotes, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-unused-expressions, no-return-assign, no-param-reassign, no-var, new-cap, wrap-iife, no-unused-vars, quotes, jasmine/no-expect-in-setup-teardown, padded-blocks, max-len */
+
+/* global Project */
 
 /*= require bootstrap */
 /*= require select2 */
diff --git a/spec/javascripts/right_sidebar_spec.js b/spec/javascripts/right_sidebar_spec.js
index 0a9bc546144..a083dbf033a 100644
--- a/spec/javascripts/right_sidebar_spec.js
+++ b/spec/javascripts/right_sidebar_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, new-parens, no-undef, no-return-assign, new-cap, vars-on-top, semi, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, new-parens, no-return-assign, new-cap, vars-on-top, semi, padded-blocks, max-len */
+/* global Sidebar */
 
 /*= require right_sidebar */
 /*= require jquery */
diff --git a/spec/javascripts/shortcuts_issuable_spec.js b/spec/javascripts/shortcuts_issuable_spec.js
index e37816b0a8c..7bc898aed5d 100644
--- a/spec/javascripts/shortcuts_issuable_spec.js
+++ b/spec/javascripts/shortcuts_issuable_spec.js
@@ -1,4 +1,5 @@
-/* eslint-disable space-before-function-paren, no-return-assign, no-undef, no-var, quotes, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-return-assign, no-var, quotes, padded-blocks */
+/* global ShortcutsIssuable */
 
 /*= require shortcuts_issuable */
 
diff --git a/spec/javascripts/subbable_resource_spec.js.es6 b/spec/javascripts/subbable_resource_spec.js.es6
index df395296791..6a70dd856a7 100644
--- a/spec/javascripts/subbable_resource_spec.js.es6
+++ b/spec/javascripts/subbable_resource_spec.js.es6
@@ -1,4 +1,5 @@
-/* eslint-disable */
+/* eslint-disable max-len, arrow-parens, comma-dangle, no-plusplus */
+
 //= vue
 //= vue-resource
 //= require jquery
diff --git a/spec/javascripts/u2f/authenticate_spec.js b/spec/javascripts/u2f/authenticate_spec.js
index 944df6d23f7..a8874ab12d3 100644
--- a/spec/javascripts/u2f/authenticate_spec.js
+++ b/spec/javascripts/u2f/authenticate_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable space-before-function-paren, new-parens, no-undef, quotes, comma-dangle, no-var, one-var, one-var-declaration-per-line, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, new-parens, quotes, comma-dangle, no-var, one-var, one-var-declaration-per-line, padded-blocks, max-len */
+/* global MockU2FDevice */
+/* global U2FAuthenticate */
 
 /*= require u2f/authenticate */
 /*= require u2f/util */
diff --git a/spec/javascripts/u2f/register_spec.js b/spec/javascripts/u2f/register_spec.js
index 0c73c5772bd..189592ea87a 100644
--- a/spec/javascripts/u2f/register_spec.js
+++ b/spec/javascripts/u2f/register_spec.js
@@ -1,4 +1,6 @@
-/* eslint-disable space-before-function-paren, new-parens, no-undef, quotes, no-var, one-var, one-var-declaration-per-line, comma-dangle, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, new-parens, quotes, no-var, one-var, one-var-declaration-per-line, comma-dangle, padded-blocks, max-len */
+/* global MockU2FDevice */
+/* global U2FRegister */
 
 /*= require u2f/register */
 /*= require u2f/util */
diff --git a/spec/javascripts/zen_mode_spec.js b/spec/javascripts/zen_mode_spec.js
index b9acaaa5a0d..d80ce5a7f7e 100644
--- a/spec/javascripts/zen_mode_spec.js
+++ b/spec/javascripts/zen_mode_spec.js
@@ -1,4 +1,7 @@
-/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, no-undef, object-shorthand, comma-dangle, no-return-assign, new-cap, padded-blocks, max-len */
+/* eslint-disable space-before-function-paren, no-var, one-var, one-var-declaration-per-line, object-shorthand, comma-dangle, no-return-assign, new-cap, padded-blocks, max-len */
+/* global Dropzone */
+/* global Mousetrap */
+/* global ZenMode */
 
 /*= require zen_mode */