rework eslint config (#11615)

* rework eslint config

- use explicit config that only enables rules
- upgrade eslint to 7.1.0
- add new plugins with selected rules enabled
- fix discovered issues, remove global wipPrefixes

* remove if

* undo template change

* add disabled rules as well for easier config updating

* add missing disabled rule

* update eslint and plugins

* fix new violation

* remove deprecated rules

Co-authored-by: Lauris BH <lauris@nix.lv>

8 files changed, 725 insertions, 163 deletions

diff --git a/.eslintrc b/.eslintrc
index 3156f88375..1a7551aee7 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,15 +1,18 @@
 root: true
-
-extends:
-  - eslint-config-airbnb-base
-  - eslint:recommended
+reportUnusedDisableDirectives: true
 
 ignorePatterns:
   - /web_src/js/vendor
 
 parserOptions:
+  sourceType: module
   ecmaVersion: 2020
 
+plugins:
+  - eslint-plugin-unicorn
+  - eslint-plugin-import
+  - eslint-plugin-sonarjs
+
 env:
   browser: true
   es6: true
@@ -28,47 +31,373 @@ overrides:
   - files: ["web_src/**/*.worker.js", "web_src/js/serviceworker.js"]
     env:
       worker: true
-    rules:
-      no-restricted-globals: [0]
 
 rules:
+  accessor-pairs: [2]
+  array-bracket-newline: [0]
+  array-bracket-spacing: [2, never]
+  array-callback-return: [0]
+  array-element-newline: [0]
   arrow-body-style: [0]
   arrow-parens: [2, always]
+  arrow-spacing: [2, {before: true, after: true}]
+  block-scoped-var: [2]
+  brace-style: [2, 1tbs, {allowSingleLine: true}]
   camelcase: [0]
+  capitalized-comments: [0]
+  class-methods-use-this: [0]
   comma-dangle: [2, only-multiline]
+  comma-spacing: [2, {before: false, after: true}]
+  comma-style: [2, last]
+  complexity: [0]
+  computed-property-spacing: [2, never]
   consistent-return: [0]
+  consistent-this: [0]
+  constructor-super: [2]
+  curly: [0]
+  default-case-last: [2]
   default-case: [0]
+  default-param-last: [0]
+  dot-location: [2, property]
+  dot-notation: [0]
+  eol-last: [2]
+  eqeqeq: [2]
+  for-direction: [2]
+  func-call-spacing: [2, never]
+  func-name-matching: [2]
   func-names: [0]
+  func-style: [0]
+  function-call-argument-newline: [0]
+  function-paren-newline: [0]
+  generator-star-spacing: [0]
+  getter-return: [2]
+  grouped-accessor-pairs: [2]
+  guard-for-in: [0]
+  id-blacklist: [0]
+  id-length: [0]
+  id-match: [0]
+  implicit-arrow-linebreak: [0]
+  import/default: [0]
+  import/dynamic-import-chunkname: [0]
+  import/export: [2]
+  import/exports-last: [0]
   import/extensions: [2, always, {ignorePackages: true}]
+  import/first: [2]
+  import/group-exports: [0]
+  import/max-dependencies: [0]
+  import/named: [2]
+  import/namespace: [0]
+  import/newline-after-import: [0]
+  import/no-absolute-path: [0]
+  import/no-amd: [0]
+  import/no-anonymous-default-export: [0]
+  import/no-commonjs: [0]
+  import/no-cycle: [0]
+  import/no-default-export: [0]
+  import/no-deprecated: [0]
+  import/no-dynamic-require: [0]
+  import/no-extraneous-dependencies: [2]
+  import/no-internal-modules: [0]
+  import/no-mutable-exports: [2]
+  import/no-named-as-default-member: [0]
+  import/no-named-as-default: [2]
+  import/no-named-default: [0]
+  import/no-named-export: [0]
+  import/no-namespace: [0]
+  import/no-nodejs-modules: [0]
+  import/no-relative-parent-imports: [0]
+  import/no-restricted-paths: [0]
+  import/no-self-import: [2]
+  import/no-unassigned-import: [0]
+  import/no-unresolved: [2, {commonjs: true}]
+  import/no-unused-modules: [0]
+  import/no-useless-path-segments: [2, {commonjs: true}]
+  import/no-webpack-loader-syntax: [2]
+  import/order: [0]
   import/prefer-default-export: [0]
+  import/unambiguous: [0]
+  indent: [2, 2, {ignoreComments: true, SwitchCase: 1}]
+  init-declarations: [0]
+  key-spacing: [2]
+  keyword-spacing: [2]
+  line-comment-position: [0]
+  linebreak-style: [2, unix]
+  lines-around-comment: [0]
+  lines-between-class-members: [0]
+  max-classes-per-file: [0]
+  max-depth: [0]
   max-len: [0]
+  max-lines-per-function: [0]
+  max-lines: [0]
+  max-nested-callbacks: [0]
+  max-params: [0]
+  max-statements-per-line: [0]
+  max-statements: [0]
   multiline-comment-style: [2, separate-lines]
+  multiline-ternary: [0]
+  new-cap: [0]
+  new-parens: [2]
   newline-per-chained-call: [0]
   no-alert: [0]
+  no-array-constructor: [2]
+  no-async-promise-executor: [2]
+  no-await-in-loop: [0]
+  no-bitwise: [0]
+  no-buffer-constructor: [0]
+  no-caller: [2]
+  no-case-declarations: [2]
+  no-class-assign: [2]
+  no-compare-neg-zero: [2]
   no-cond-assign: [2, except-parens]
+  no-confusing-arrow: [0]
   no-console: [1, {allow: [info, warn, error]}]
+  no-const-assign: [2]
+  no-constant-condition: [0]
+  no-constructor-return: [2]
   no-continue: [0]
+  no-control-regex: [0]
+  no-debugger: [1]
+  no-delete-var: [2]
+  no-div-regex: [0]
+  no-dupe-args: [2]
+  no-dupe-class-members: [2]
+  no-dupe-else-if: [2]
+  no-dupe-keys: [2]
+  no-duplicate-case: [2]
+  no-duplicate-imports: [2]
+  no-else-return: [0]
+  no-empty-character-class: [2]
+  no-empty-function: [0]
+  no-empty-pattern: [2]
   no-empty: [2, {allowEmptyCatch: true}]
   no-eq-null: [2]
+  no-eval: [2]
+  no-ex-assign: [2]
+  no-extend-native: [2]
+  no-extra-bind: [2]
+  no-extra-boolean-cast: [2]
+  no-extra-label: [0]
+  no-extra-parens: [0]
+  no-extra-semi: [2]
+  no-fallthrough: [2]
+  no-floating-decimal: [0]
+  no-func-assign: [2]
+  no-global-assign: [2]
+  no-implicit-coercion: [0]
+  no-implicit-globals: [0]
+  no-implied-eval: [2]
+  no-import-assign: [2]
+  no-inline-comments: [0]
+  no-inner-declarations: [2]
+  no-invalid-regexp: [2]
+  no-invalid-this: [0]
+  no-irregular-whitespace: [2]
+  no-iterator: [2]
+  no-label-var: [2]
+  no-labels: [2]
+  no-lone-blocks: [2]
+  no-lonely-if: [0]
+  no-loop-func: [0]
+  no-loss-of-precision: [2]
+  no-magic-numbers: [0]
+  no-misleading-character-class: [2]
   no-mixed-operators: [0]
+  no-mixed-spaces-and-tabs: [2]
   no-multi-assign: [0]
+  no-multi-spaces: [2, {ignoreEOLComments: true, exceptions: {Property: true, VariableDeclarator: true}}]
+  no-multi-str: [2]
+  no-negated-condition: [0]
+  no-nested-ternary: [0]
+  no-new-func: [2]
+  no-new-object: [2]
+  no-new-symbol: [2]
+  no-new-wrappers: [2]
   no-new: [0]
+  no-obj-calls: [2]
+  no-octal-escape: [2]
+  no-octal: [2]
   no-param-reassign: [0]
   no-plusplus: [0]
-  no-restricted-syntax: [0]
+  no-proto: [2]
+  no-prototype-builtins: [2]
+  no-redeclare: [2]
+  no-regex-spaces: [2]
+  no-restricted-exports: [0]
+  no-restricted-globals: [0]
+  no-restricted-imports: [0]
+  no-restricted-syntax: [2, WithStatement, ForInStatement, LabeledStatement]
+  no-return-assign: [0]
   no-return-await: [0]
+  no-script-url: [2]
+  no-self-assign: [2, {props: true}]
+  no-self-compare: [2]
+  no-sequences: [2]
+  no-setter-return: [2]
+  no-shadow-restricted-names: [2]
   no-shadow: [0]
+  no-sparse-arrays: [2]
+  no-tabs: [2]
+  no-template-curly-in-string: [2]
+  no-ternary: [0]
+  no-this-before-super: [2]
+  no-throw-literal: [2]
+  no-trailing-spaces: [2]
+  no-undef-init: [2]
+  no-undef: [2, {typeof: true}]
+  no-undefined: [0]
   no-underscore-dangle: [0]
-  no-unused-vars: [2, {args: all, argsIgnorePattern: ^_, varsIgnorePattern: ^_, ignoreRestSiblings: true}]
-  no-use-before-define: [0]
+  no-unexpected-multiline: [2]
+  no-unmodified-loop-condition: [2]
+  no-unneeded-ternary: [0]
+  no-unreachable: [2]
+  no-unsafe-finally: [2]
+  no-unsafe-negation: [2]
+  no-unused-expressions: [2]
+  no-unused-labels: [2]
+  no-unused-vars: [2, {args: all, argsIgnorePattern: ^_, varsIgnorePattern: ^_, caughtErrorsIgnorePattern: ^_, ignoreRestSiblings: false}]
+  no-use-before-define: [2, nofunc]
+  no-useless-backreference: [0]
+  no-useless-call: [2]
+  no-useless-catch: [2]
+  no-useless-computed-key: [2]
+  no-useless-concat: [2]
+  no-useless-constructor: [2]
+  no-useless-escape: [2]
+  no-useless-rename: [2]
+  no-useless-return: [0]
   no-var: [2]
+  no-void: [2]
+  no-warning-comments: [0]
+  no-whitespace-before-property: [2]
+  no-with: [2]
+  nonblock-statement-body-position: [2]
   object-curly-newline: [0]
   object-curly-spacing: [2, never]
+  object-shorthand: [2, always]
   one-var-declaration-per-line: [0]
   one-var: [0]
+  operator-assignment: [2, always]
   operator-linebreak: [2, after]
+  padded-blocks: [2, never]
+  padding-line-between-statements: [0]
+  prefer-arrow-callback: [2, {allowNamedFunctions: true, allowUnboundThis: true}]
   prefer-const: [2, {destructuring: all}]
   prefer-destructuring: [0]
+  prefer-exponentiation-operator: [2]
+  prefer-named-capture-group: [0]
+  prefer-numeric-literals: [2]
+  prefer-object-spread: [0]
+  prefer-promise-reject-errors: [2, {allowEmptyReject: false}]
+  prefer-regex-literals: [2]
+  prefer-rest-params: [2]
+  prefer-spread: [2]
+  prefer-template: [2]
+  quote-props: [0]
   quotes: [2, single, {avoidEscape: true, allowTemplateLiterals: true}]
   radix: [2, as-needed]
+  require-atomic-updates: [0]
+  require-await: [0]
+  require-unicode-regexp: [0]
+  require-yield: [2]
+  rest-spread-spacing: [2, never]
+  semi-spacing: [2, {before: false, after: true}]
+  semi-style: [2, last]
   semi: [2, always, {omitLastInOneLineBlock: true}]
+  sonarjs/cognitive-complexity: [0]
+  sonarjs/max-switch-cases: [0]
+  sonarjs/no-all-duplicated-branches: [2]
+  sonarjs/no-collapsible-if: [0]
+  sonarjs/no-collection-size-mischeck: [2]
+  sonarjs/no-duplicate-string: [0]
+  sonarjs/no-duplicated-branches: [0]
+  sonarjs/no-element-overwrite: [2]
+  sonarjs/no-extra-arguments: [0]
+  sonarjs/no-identical-conditions: [2]
+  sonarjs/no-identical-expressions: [0]
+  sonarjs/no-identical-functions: [0]
+  sonarjs/no-inverted-boolean-check: [2]
+  sonarjs/no-one-iteration-loop: [2]
+  sonarjs/no-redundant-boolean: [2]
+  sonarjs/no-redundant-jump: [0]
+  sonarjs/no-same-line-conditional: [2]
+  sonarjs/no-small-switch: [0]
+  sonarjs/no-unused-collection: [2]
+  sonarjs/no-use-of-empty-return-value: [2]
+  sonarjs/no-useless-catch: [0]
+  sonarjs/prefer-immediate-return: [0]
+  sonarjs/prefer-object-literal: [2]
+  sonarjs/prefer-single-boolean-return: [0]
+  sonarjs/prefer-while: [2]
+  sort-imports: [0]
+  sort-keys: [0]
+  sort-vars: [0]
+  space-before-blocks: [2, always]
+  space-in-parens: [2, never]
+  space-infix-ops: [2]
+  space-unary-ops: [2]
+  spaced-comment: [2, always]
+  strict: [0]
+  switch-colon-spacing: [2]
+  symbol-description: [2]
+  template-curly-spacing: [2, never]
+  template-tag-spacing: [2, never]
+  unicode-bom: [2, never]
+  unicorn/better-regex: [0]
+  unicorn/catch-error-name: [0]
+  unicorn/consistent-function-scoping: [2]
+  unicorn/custom-error-definition: [0]
+  unicorn/error-message: [0]
+  unicorn/escape-case: [0]
+  unicorn/expiring-todo-comments: [0]
+  unicorn/explicit-length-check: [0]
+  unicorn/filename-case: [0]
+  unicorn/import-index: [0]
+  unicorn/new-for-builtins: [2]
+  unicorn/no-abusive-eslint-disable: [0]
+  unicorn/no-array-instanceof: [0]
+  unicorn/no-console-spaces: [0]
+  unicorn/no-fn-reference-in-iterator: [0]
+  unicorn/no-for-loop: [0]
+  unicorn/no-hex-escape: [0]
+  unicorn/no-keyword-prefix: [0]
+  unicorn/no-nested-ternary: [0]
+  unicorn/no-new-buffer: [0]
+  unicorn/no-null: [0]
+  unicorn/no-process-exit: [0]
+  unicorn/no-reduce: [2]
+  unicorn/no-unreadable-array-destructuring: [0]
+  unicorn/no-unsafe-regex: [0]
+  unicorn/no-unused-properties: [2]
+  unicorn/no-useless-undefined: [0]
+  unicorn/no-zero-fractions: [2]
+  unicorn/number-literal-case: [0]
+  unicorn/prefer-add-event-listener: [2]
+  unicorn/prefer-dataset: [2]
+  unicorn/prefer-event-key: [2]
+  unicorn/prefer-includes: [2]
+  unicorn/prefer-modern-dom-apis: [0]
+  unicorn/prefer-negative-index: [2]
+  unicorn/prefer-node-append: [0]
+  unicorn/prefer-node-remove: [0]
+  unicorn/prefer-number-properties: [0]
+  unicorn/prefer-optional-catch-binding: [2]
+  unicorn/prefer-query-selector: [0]
+  unicorn/prefer-reflect-apply: [0]
+  unicorn/prefer-replace-all: [0]
+  unicorn/prefer-set-has: [0]
+  unicorn/prefer-spread: [0]
+  unicorn/prefer-starts-ends-with: [2]
+  unicorn/prefer-string-slice: [0]
+  unicorn/prefer-text-content: [2]
+  unicorn/prefer-trim-start-end: [2]
+  unicorn/prefer-type-error: [0]
+  unicorn/prevent-abbreviations: [0]
+  unicorn/string-content: [0]
+  unicorn/throw-new-error: [2]
+  use-isnan: [2]
+  valid-typeof: [2, {requireStringLiterals: true}]
+  vars-on-top: [0]
+  wrap-iife: [2, inside]
+  wrap-regex: [0]
+  yield-star-spacing: [2, after]
+  yoda: [2, never]
diff --git a/package-lock.json b/package-lock.json
index a0c65cc93d..cbe7fcde58 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1093,6 +1093,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@types/json5": {
+      "version": "0.0.29",
+      "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
+      "integrity": "sha1-7ihweulOEdK4J7y+UnC86n8+ce4=",
+      "dev": true
+    },
     "@types/minimist": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.0.tgz",
@@ -2649,6 +2655,12 @@
         "tslib": "^1.9.0"
       }
     },
+    "ci-info": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
+      "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==",
+      "dev": true
+    },
     "cipher-base": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
@@ -2704,6 +2716,15 @@
         }
       }
     },
+    "clean-regexp": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/clean-regexp/-/clean-regexp-1.0.0.tgz",
+      "integrity": "sha1-jffHquUf02h06PjQW5GAvBGj/tc=",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "^1.0.5"
+      }
+    },
     "clean-stack": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@@ -2937,12 +2958,6 @@
         "proto-list": "~1.2.1"
       }
     },
-    "confusing-browser-globals": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/confusing-browser-globals/-/confusing-browser-globals-1.0.9.tgz",
-      "integrity": "sha512-KbS1Y0jMtyPgIxjO7ZzMAuUpAKMt1SzCL9fsrKsX6b0zJPTaT0SiSPmewwVZg9UAO83HVIlEhZF84LIjZ0lmAw==",
-      "dev": true
-    },
     "console-browserify": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/console-browserify/-/console-browserify-1.2.0.tgz",
@@ -4043,22 +4058,22 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "eslint": {
-      "version": "6.8.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.8.0.tgz",
-      "integrity": "sha512-K+Iayyo2LtyYhDSYwz5D5QdWw0hCacNzyq1Y821Xna2xSJj7cijoLLYmLxTQgcgZ9mC61nryMy9S7GRbYpI5Ig==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.2.0.tgz",
+      "integrity": "sha512-B3BtEyaDKC5MlfDa2Ha8/D6DsS4fju95zs0hjS3HdGazw+LNayai38A25qMppK37wWGWNYSPOR6oYzlz5MHsRQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
         "ajv": "^6.10.0",
-        "chalk": "^2.1.0",
-        "cross-spawn": "^6.0.5",
+        "chalk": "^4.0.0",
+        "cross-spawn": "^7.0.2",
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
-        "eslint-scope": "^5.0.0",
-        "eslint-utils": "^1.4.3",
-        "eslint-visitor-keys": "^1.1.0",
-        "espree": "^6.1.2",
-        "esquery": "^1.0.1",
+        "eslint-scope": "^5.1.0",
+        "eslint-utils": "^2.0.0",
+        "eslint-visitor-keys": "^1.2.0",
+        "espree": "^7.1.0",
+        "esquery": "^1.2.0",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
@@ -4071,17 +4086,16 @@
         "is-glob": "^4.0.0",
         "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
-        "levn": "^0.3.0",
+        "levn": "^0.4.1",
         "lodash": "^4.17.14",
         "minimatch": "^3.0.4",
-        "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
-        "optionator": "^0.8.3",
+        "optionator": "^0.9.1",
         "progress": "^2.0.0",
-        "regexpp": "^2.0.1",
-        "semver": "^6.1.2",
-        "strip-ansi": "^5.2.0",
-        "strip-json-comments": "^3.0.1",
+        "regexpp": "^3.1.0",
+        "semver": "^7.2.1",
+        "strip-ansi": "^6.0.0",
+        "strip-json-comments": "^3.1.0",
         "table": "^5.2.3",
         "text-table": "^0.2.0",
         "v8-compile-cache": "^2.0.3"
@@ -4120,6 +4134,16 @@
             "color-convert": "^2.0.1"
           }
         },
+        "chalk": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
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       "dependencies": {
         "acorn": {
@@ -6962,6 +7146,12 @@
         "resolve-cwd": "^2.0.0"
       }
     },
+    "import-modules": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/import-modules/-/import-modules-2.0.0.tgz",
+      "integrity": "sha512-iczM/v9drffdNnABOKwj0f9G3cFDon99VcG1mxeBsdqnbd+vnQ5c2uAiCHNQITqFTOPaEvwg3VjoWCur0uHLEw==",
+      "dev": true
+    },
     "import-regex": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/import-regex/-/import-regex-1.1.0.tgz",
@@ -7804,13 +7994,13 @@
       }
     },
     "levn": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
-      "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
       "dev": true,
       "requires": {
-        "prelude-ls": "~1.1.2",
-        "type-check": "~0.3.2"
+        "prelude-ls": "^1.2.1",
+        "type-check": "~0.4.0"
       }
     },
     "liftoff": {
@@ -8142,6 +8332,12 @@
       "resolved": "https://registry.npmjs.org/lodash.uniq/-/lodash.uniq-4.5.0.tgz",
       "integrity": "sha1-0CJTc662Uq3BvILklFM5qEJ1R3M="
     },
+    "lodash.zip": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/lodash.zip/-/lodash.zip-4.2.0.tgz",
+      "integrity": "sha1-7GZi5IlkCO1KtsVCo5kLcswIACA=",
+      "dev": true
+    },
     "log-symbols": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-3.0.0.tgz",
@@ -8934,6 +9130,12 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
+    "multimap": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/multimap/-/multimap-1.1.0.tgz",
+      "integrity": "sha512-0ZIR9PasPxGXmRsEF8jsDzndzHDj7tIav+JUmvIFB/WHswliFnquxECT/De7GR4yg99ky/NlRKJT82G1y271bw==",
+      "dev": true
+    },
     "multipipe": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/multipipe/-/multipipe-0.1.2.tgz",
@@ -9265,18 +9467,6 @@
         }
       }
     },
-    "object.entries": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/object.entries/-/object.entries-1.1.1.tgz",
-      "integrity": "sha512-ilqR7BgdyZetJutmDPfXCDffGa0/Yzl2ivVNpbx/g4UeWrCdRnFDUBrKJGLhGieRHDATnyZXWBeCb29k9CJysQ==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.0-next.1",
-        "function-bind": "^1.1.1",
-        "has": "^1.0.3"
-      }
-    },
     "object.getownpropertydescriptors": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.1.0.tgz",
@@ -9361,17 +9551,17 @@
       }
     },
     "optionator": {
-      "version": "0.8.3",
-      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
-      "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
+      "version": "0.9.1",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
+      "integrity": "sha512-74RlY5FCnhq4jRxVUPKDaRwrVNXMqsGsiW6AJw4XK8hmtm10wC0ypZBLw5IIp85NZMr91+qd1RvvENwg7jjRFw==",
       "dev": true,
       "requires": {
-        "deep-is": "~0.1.3",
-        "fast-levenshtein": "~2.0.6",
-        "levn": "~0.3.0",
-        "prelude-ls": "~1.1.2",
-        "type-check": "~0.3.2",
-        "word-wrap": "~1.2.3"
+        "deep-is": "^0.1.3",
+        "fast-levenshtein": "^2.0.6",
+        "levn": "^0.4.1",
+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.3"
       }
     },
     "ordered-read-streams": {
@@ -9758,6 +9948,12 @@
         "irregular-plurals": "^2.0.0"
       }
     },
+    "pluralize": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-8.0.0.tgz",
+      "integrity": "sha512-Nc3IT5yHzflTfbjgqWcCPpo7DaKy4FnpB0l/zCAW0Tc7jxAiuqSxHasntB3D7887LSrA93kDJ9IXovxJYxyLCA==",
+      "dev": true
+    },
     "popper.js": {
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/popper.js/-/popper.js-1.16.1.tgz",
@@ -10818,9 +11014,9 @@
       }
     },
     "prelude-ls": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
       "dev": true
     },
     "prepend-http": {
@@ -11365,6 +11561,12 @@
         "safe-regex": "^1.1.0"
       }
     },
+    "regexp-tree": {
+      "version": "0.1.21",
+      "resolved": "https://registry.npmjs.org/regexp-tree/-/regexp-tree-0.1.21.tgz",
+      "integrity": "sha512-kUUXjX4AnqnR8KRTCrayAo9PzYMRKmVoGgaz2tBuz0MF3g1ZbGebmtW0yFHfFK9CmBjQKeYIgoL22pFLBJY7sw==",
+      "dev": true
+    },
     "regexp.prototype.flags": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/regexp.prototype.flags/-/regexp.prototype.flags-1.3.0.tgz",
@@ -11375,9 +11577,9 @@
       }
     },
     "regexpp": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
-      "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
+      "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
       "dev": true
     },
     "regexpu-core": {
@@ -11640,6 +11842,12 @@
       "resolved": "https://registry.npmjs.org/reselect/-/reselect-4.0.0.tgz",
       "integrity": "sha512-qUgANli03jjAyGlnbYVAV5vvnOmJnODyABz51RdBN7M4WaVu8mecZWgyQNkG8Yqe3KRGRt0l4K4B3XVEULC4CA=="
     },
+    "reserved-words": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/reserved-words/-/reserved-words-0.1.2.tgz",
+      "integrity": "sha1-AKCUD5jNUBrqqsMWQR2a3FKzGrE=",
+      "dev": true
+    },
     "resolve": {
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
@@ -13633,6 +13841,35 @@
       "integrity": "sha512-rvuRbTarPXmMb79SmzEp8aqXNKcK+y0XaB298IXueQ8I2PsrATcPBCSPyK/dDNa2iWOhKlfNnOjdAOTBU/nkFA==",
       "dev": true
     },
+    "tsconfig-paths": {
+      "version": "3.9.0",
+      "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz",
+      "integrity": "sha512-dRcuzokWhajtZWkQsDVKbWyY+jgcLC5sqJhg2PSgf4ZkH2aHPvaOY8YWGhmjb68b5qqTfasSsDO9k7RUiEmZAw==",
+      "dev": true,
+      "requires": {
+        "@types/json5": "^0.0.29",
+        "json5": "^1.0.1",
+        "minimist": "^1.2.0",
+        "strip-bom": "^3.0.0"
+      },
+      "dependencies": {
+        "json5": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
+          "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.0"
+          }
+        },
+        "strip-bom": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+          "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+          "dev": true
+        }
+      }
+    },
     "tslib": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
@@ -13664,12 +13901,12 @@
       "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg=="
     },
     "type-check": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
       "dev": true,
       "requires": {
-        "prelude-ls": "~1.1.2"
+        "prelude-ls": "^1.2.1"
       }
     },
     "type-fest": {
diff --git a/package.json b/package.json
index b80cb867de..fac0dd2cfc 100644
--- a/package.json
+++ b/package.json
@@ -53,9 +53,10 @@
     "worker-loader": "2.0.0"
   },
   "devDependencies": {
-    "eslint": "6.8.0",
-    "eslint-config-airbnb-base": "14.1.0",
-    "eslint-plugin-import": "2.20.2",
+    "eslint": "7.2.0",
+    "eslint-plugin-import": "2.21.1",
+    "eslint-plugin-sonarjs": "0.5.0",
+    "eslint-plugin-unicorn": "20.1.0",
     "stylelint": "13.3.3",
     "stylelint-config-standard": "20.0.0",
     "updates": "10.2.11"
diff --git a/templates/repo/issue/new_form.tmpl b/templates/repo/issue/new_form.tmpl
index a42a4d9ad5..38ccccaf7b 100644
--- a/templates/repo/issue/new_form.tmpl
+++ b/templates/repo/issue/new_form.tmpl
@@ -15,7 +15,7 @@
 					<div class="field">
 						<input name="title" id="issue_title" placeholder="{{.i18n.Tr "repo.milestones.title"}}" value="{{.title}}" tabindex="3" autofocus required maxlength="255">
 						{{if .PageIsComparePull}}
-							<div class="title_wip_desc">{{.i18n.Tr "repo.pulls.title_wip_desc" (index .PullRequestWorkInProgressPrefixes 0| Escape) | Safe}}</div>
+							<div class="title_wip_desc" data-wip-prefixes="{{Json .PullRequestWorkInProgressPrefixes}}">{{.i18n.Tr "repo.pulls.title_wip_desc" (index .PullRequestWorkInProgressPrefixes 0| Escape) | Safe}}</div>
 						{{end}}
 					</div>
 					{{template "repo/issue/comment_tab" .}}
@@ -59,7 +59,7 @@
 							<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}"><span class="octicon-check {{if not .IsChecked}}invisible{{end}}">{{svg "octicon-check" 16}}</span><span class="label color" style="background-color: {{.Color}}"></span> {{.Name | RenderEmoji}}
 							{{if .Description }}<br><small class="desc">{{.Description | RenderEmoji}}</small>{{end}}</a>
 						{{end}}
-					
+
 						<div class="ui divider"></div>
 						{{range .OrgLabels}}
 							<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}"><span class="octicon-check {{if not .IsChecked}}invisible{{end}}">{{svg "octicon-check" 16}}</span><span class="label color" style="background-color: {{.Color}}"></span> {{.Name | RenderEmoji}}
@@ -176,7 +176,4 @@
 		</div>
 	</div>
 </form>
-{{if .PageIsComparePull}}
-	<script>window.wipPrefixes = {{.PullRequestWorkInProgressPrefixes}}</script>
-{{end}}
 
diff --git a/web_src/js/features/clipboard.js b/web_src/js/features/clipboard.js
index a3b6b26eb3..32eff981b8 100644
--- a/web_src/js/features/clipboard.js
+++ b/web_src/js/features/clipboard.js
@@ -7,17 +7,16 @@ export default async function initClipboard() {
   const clipboard = new ClipboardJS(els);
   clipboard.on('success', (e) => {
     e.clearSelection();
-
-    $(`#${e.trigger.getAttribute('id')}`).popup('destroy');
-    e.trigger.setAttribute('data-content', e.trigger.getAttribute('data-success'));
-    $(`#${e.trigger.getAttribute('id')}`).popup('show');
-    e.trigger.setAttribute('data-content', e.trigger.getAttribute('data-original'));
+    $(e.trigger).popup('destroy');
+    e.trigger.dataset.content = e.trigger.dataset.success;
+    $(e.trigger).popup('show');
+    e.trigger.dataset.content = e.trigger.dataset.original;
   });
 
   clipboard.on('error', (e) => {
-    $(`#${e.trigger.getAttribute('id')}`).popup('destroy');
-    e.trigger.setAttribute('data-content', e.trigger.getAttribute('data-error'));
-    $(`#${e.trigger.getAttribute('id')}`).popup('show');
-    e.trigger.setAttribute('data-content', e.trigger.getAttribute('data-original'));
+    $(e.trigger).popup('destroy');
+    e.trigger.dataset.content = e.trigger.dataset.error;
+    $(e.trigger).popup('show');
+    e.trigger.dataset.content = e.trigger.dataset.original;
   });
 }
diff --git a/web_src/js/features/codeeditor.js b/web_src/js/features/codeeditor.js
index 2e268379b2..d9ddb58d00 100644
--- a/web_src/js/features/codeeditor.js
+++ b/web_src/js/features/codeeditor.js
@@ -6,7 +6,7 @@ const languagesByExt = {};
 function getEditorconfig(input) {
   try {
     return JSON.parse(input.dataset.editorconfig);
-  } catch (_err) {
+  } catch {
     return null;
   }
 }
diff --git a/web_src/js/features/highlight.worker.js b/web_src/js/features/highlight.worker.js
index 7d6cc4e438..4a0f55f441 100644
--- a/web_src/js/features/highlight.worker.js
+++ b/web_src/js/features/highlight.worker.js
@@ -1,7 +1,7 @@
 import {highlightBlock} from 'highlight.js';
 import {createWindow} from 'domino';
 
-self.onmessage = function ({data}) {
+self.addEventListener('message', ({data}) => {
   const window = createWindow();
   self.document = window.document;
 
@@ -9,4 +9,4 @@ self.onmessage = function ({data}) {
   document.body.innerHTML = html;
   highlightBlock(document.body.firstChild);
   self.postMessage({index, html: document.body.innerHTML});
-};
+});
diff --git a/web_src/js/index.js b/web_src/js/index.js
index 21809f73fa..efe1663a76 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -1,4 +1,3 @@
-/* globals wipPrefixes */
 /* exported timeAddManual, toggleStopwatch, cancelStopwatch */
 /* exported toggleDeadlineForm, setDeadline, updateDeadline, deleteDependencyModal, cancelCodeComment, onOAuthLoginClick */
 
@@ -2178,8 +2177,9 @@ function initWipTitle() {
     $issueTitle.focus();
     const value = $issueTitle.val().trim().toUpperCase();
 
-    for (const i in wipPrefixes) {
-      if (value.startsWith(wipPrefixes[i].toUpperCase())) {
+    const wipPrefixes = $('.title_wip_desc').data('wip-prefixes');
+    for (const prefix of wipPrefixes) {
+      if (value.startsWith(prefix.toUpperCase())) {
         return;
       }
     }
@@ -2472,10 +2472,9 @@ $(document).ready(async () => {
     'div.repository.settings.collaboration': initRepositoryCollaboration
   };
 
-  let selector;
-  for (selector in routes) {
+  for (const [selector, fn] of Object.entries(routes)) {
     if ($(selector).length > 0) {
-      routes[selector]();
+      fn();
       break;
     }
   }
@@ -2972,13 +2971,13 @@ function initVueComponents() {
       repoClass(repo) {
         if (repo.fork) {
           return 'octicon-repo-forked';
-        } if (repo.mirror) {
+        } else if (repo.mirror) {
           return 'octicon-repo-clone';
-        } if (repo.template) {
+        } else if (repo.template) {
           return `octicon-repo-template${repo.private ? '-private' : ''}`;
-        } if (repo.private) {
+        } else if (repo.private) {
           return 'octicon-lock';
-        } if (repo.internal) {
+        } else if (repo.internal) {
           return 'octicon-internal-repo';
         }
         return 'octicon-repo';