From 772d42bec006e7d0d028a29daff84db9ccc8dfbc Mon Sep 17 00:00:00 2001
From: Michael Schmidt <mitchi5000.ms@googlemail.com>
Date: Fri, 26 Mar 2021 13:16:16 +0100
Subject: [PATCH] Added ESLint with minimal config (#2831)

---
 .eslintrc.js                                  | 122 +++
 .github/workflows/test.yml                    |  13 +
 .npmignore                                    |   1 +
 assets/code.js                                |  20 +-
 assets/download.js                            |  20 +-
 components/prism-abap.js                      |   4 +-
 components/prism-bsl.js                       |   2 +
 components/prism-coffeescript.js              |  10 +-
 components/prism-core.js                      |   5 +-
 components/prism-js-templates.js              |   2 +-
 components/prism-naniscript.js                |   2 +-
 components/prism-nsis.js                      |   2 +-
 components/prism-openqasm.js                  |   2 +-
 components/prism-openqasm.min.js              |   2 +-
 components/prism-parser.js                    |   2 +-
 components/prism-parser.min.js                |   2 +-
 components/prism-pure.js                      |   1 +
 components/prism-robotframework.js            |   8 +-
 components/prism-robotframework.min.js        |   2 +-
 dependencies.js                               |   4 +-
 docs/global.html                              |   8 +-
 docs/prism-core.js.html                       |   5 +-
 gulpfile.js/index.js                          |   2 +-
 package-lock.json                             | 761 ++++++++++++++++++
 package.json                                  |   3 +
 plugins/autolinker/prism-autolinker.js        |   2 +-
 plugins/autoloader/prism-autoloader.js        |   2 +-
 .../jsonp-highlight/prism-jsonp-highlight.js  |   5 +-
 .../prism-jsonp-highlight.min.js              |   2 +-
 .../prism-normalize-whitespace.js             |  12 +-
 .../show-invisibles/prism-show-invisibles.js  |   2 +
 plugins/toolbar/prism-toolbar.js              |   2 +-
 plugins/treeview/prism-treeview.js            |   2 +-
 plugins/treeview/prism-treeview.min.js        |   2 +-
 prism.js                                      |   5 +-
 tests/helper/prism-loader.js                  |   1 -
 tests/pattern-tests.js                        |   3 +-
 tests/plugins/keep-markup/test.js             |   1 +
 38 files changed, 979 insertions(+), 67 deletions(-)
 create mode 100644 .eslintrc.js

diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000000..c5b2c2a409
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,122 @@
+/** @type {import('eslint').Linter.Config} */
+module.exports = {
+	extends: 'eslint:recommended',
+	rules: {
+		// I turned this rule off because we use `hasOwnProperty` in a lot of places
+		// TODO: Think about re-enabling this rule
+		'no-prototype-builtins': 'off',
+		// TODO: Think about re-enabling this rule
+		'no-cond-assign': 'off',
+		// TODO: Think about re-enabling this rule
+		'no-inner-declarations': 'off',
+		// TODO: Think about re-enabling this rule
+		'no-sparse-arrays': 'off',
+
+		// turning off some regex rules
+		// these are supposed to protect against accidental use but we need those quite often
+		'no-control-regex': 'off',
+		'no-empty-character-class': 'off',
+		'no-useless-escape': 'off'
+	},
+	ignorePatterns: [
+		'*.min.js',
+		'vendor/',
+		'utopia.js',
+		'docs/',
+		'components.js',
+		'prism.js',
+		'node_modules'
+	],
+
+	overrides: [
+		{
+			// Languages and plugins
+			files: [
+				'components/*.js',
+				'plugins/*/prism-*.js'
+			],
+			excludedFiles: 'components/index.js',
+			env: {
+				browser: true,
+				node: true,
+				worker: true
+			},
+			globals: {
+				'Prism': true
+			}
+		},
+		{
+			// `loadLanguages` function for Node.js
+			files: 'components/index.js',
+			env: {
+				es6: true,
+				node: true
+			},
+			parserOptions: {
+				ecmaVersion: 6
+			},
+			globals: {
+				'Prism': true
+			}
+		},
+		{
+			// Gulp and Danger
+			files: 'dependencies.js',
+			env: {
+				browser: true,
+				node: true
+			}
+		},
+		{
+			// The scripts that run on our website
+			files: 'assets/*.js',
+			env: {
+				browser: true
+			},
+			globals: {
+				'components': true,
+				'getLoader': true,
+				'PrefixFree': true,
+				'Prism': true,
+				'Promise': true,
+				'saveAs': true,
+				'$': true,
+				'$$': true,
+				'$u': true
+			}
+		},
+		{
+			// Test files
+			files: 'tests/**',
+			env: {
+				es6: true,
+				mocha: true,
+				node: true
+			},
+			parserOptions: {
+				ecmaVersion: 2018
+			}
+		},
+		{
+			// Gulp and Danger
+			files: [
+				'gulpfile.js/**',
+				'dangerfile.js'
+			],
+			env: {
+				es6: true,
+				node: true
+			},
+			parserOptions: {
+				ecmaVersion: 2018
+			}
+		},
+		{
+			// This file
+			files: '.eslintrc.js',
+			env: {
+				node: true
+			}
+		},
+	]
+};
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0e07d03419..21fdfe0be0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -44,3 +44,16 @@ jobs:
           git add --all && \
           git diff-index --cached HEAD --stat --exit-code || \
           (echo && echo "The above files changed because the build is not up to date." && echo "Please rebuild Prism." && exit 1)
+
+  lint:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js 14.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+      - run: npm ci
+      - run: npm run lint
diff --git a/.npmignore b/.npmignore
index 0e00a36ac0..fdbc02a99b 100644
--- a/.npmignore
+++ b/.npmignore
@@ -19,3 +19,4 @@ gulpfile.js
 .editorconfig
 .gitattributes
 .travis.yml
+.eslintrc.js
diff --git a/assets/code.js b/assets/code.js
index e2da68aae8..1b8ccccb4d 100644
--- a/assets/code.js
+++ b/assets/code.js
@@ -11,9 +11,9 @@ $$('[data-plugin-header]').forEach(function (element) {
 });
 
 $$('[data-src][data-type="text/html"]').forEach(function(element) {
-	var src = element.getAttribute('data-src'),
-	    html = element.getAttribute('data-type') === 'text/html',
-	    contentProperty = html ? 'innerHTML' : 'textContent';
+	var src = element.getAttribute('data-src');
+	var html = element.getAttribute('data-type') === 'text/html';
+	var contentProperty = html ? 'innerHTML' : 'textContent';
 
 	$u.xhr({
 		url: src,
@@ -24,12 +24,12 @@ $$('[data-src][data-type="text/html"]').forEach(function(element) {
 				// Run JS
 
 				$$('script', element).forEach(function (script) {
-					var after = script.nextSibling, parent = script.parentNode;
+					var parent = script.parentNode;
 					parent.removeChild(script);
 					document.head.appendChild(script);
 				});
 			}
-			catch (e) {}
+			catch (e) { /* noop */ }
 		}
 	});
 });
@@ -43,9 +43,9 @@ $$('[data-src][data-type="text/html"]').forEach(function(element) {
 var toc = document.createElement('ol');
 
 $$('body > section > h1').forEach(function(h1) {
-	var section = h1.parentNode,
-	    text = h1.textContent,
-	    id = h1.id || section.id;
+	var section = h1.parentNode;
+	var text = h1.textContent;
+	var id = h1.id || section.id;
 
 	// Assign id if one does not exist
 	if (!id) {
@@ -128,8 +128,8 @@ if (toc.children.length > 0) {
 
 		if(!style.width) {
 			// calc not supported
-			var header = $('header'),
-			    footer = $('footer');
+			var header = $('header');
+			var footer = $('footer');
 
 			function calculatePadding() {
 				header.style.padding =
diff --git a/assets/download.js b/assets/download.js
index cfd1d16a05..fba5920044 100644
--- a/assets/download.js
+++ b/assets/download.js
@@ -40,9 +40,9 @@ function toArray(value) {
 var hstr = window.location.hash.match(/(?:languages|plugins)=[-+\w]+|themes=[-\w]+/g);
 if (hstr) {
 	hstr.forEach(function(str) {
-		var kv = str.split('=', 2),
-		    category = kv[0],
-		    ids = kv[1].split('+');
+		var kv = str.split('=', 2);
+		var category = kv[0];
+		var ids = kv[1].split('+');
 		if (category !== 'meta' && category !== 'core' && components[category]) {
 			for (var id in components[category]) {
 				if (components[category][id].option) {
@@ -54,6 +54,7 @@ if (hstr) {
 				if (themeInput) {
 					themeInput.checked = true;
 				}
+				// eslint-disable-next-line no-undef
 				setTheme(ids[0]);
 			}
 			var makeDefault = function (id) {
@@ -314,8 +315,8 @@ function getFilesSizes() {
 				continue;
 			}
 
-			var distro = all[id].files[minified? 'minified' : 'dev'],
-			    files = distro.paths;
+			var distro = all[id].files[minified? 'minified' : 'dev'];
+			var files = distro.paths;
 
 			files.forEach(function (filepath) {
 				var file = cache[filepath] = cache[filepath] || {};
@@ -380,8 +381,8 @@ function update(updatedCategory, updatedId){
 					if (cache[path]) {
 						var file = cache[path];
 
-						var type = path.match(/\.(\w+)$/)[1],
-						    size = file.size || 0;
+						var type = path.match(/\.(\w+)$/)[1];
+						var size = file.size || 0;
 
 						if (info.enabled) {
 
@@ -408,6 +409,7 @@ function update(updatedCategory, updatedId){
 				if (themeInput) {
 					themeInput.checked = true;
 				}
+				// eslint-disable-next-line no-undef
 				setTheme(updatedId);
 			}
 		}
@@ -581,8 +583,8 @@ function buildCode(promises) {
 	promises = finalPromises;
 
 	// build
-	var i = 0,
-	    l = promises.length;
+	var i = 0;
+	var l = promises.length;
 	var code = {js: '', css: ''};
 	var errors = [];
 
diff --git a/components/prism-abap.js b/components/prism-abap.js
index 4ee1350956..e598ccef15 100644
--- a/components/prism-abap.js
+++ b/components/prism-abap.js
@@ -40,8 +40,8 @@ Prism.languages.abap = {
 		lookbehind: true,
 		alias: "punctuation"
 	}, {
-	    /* Special tokens used do delimit string templates */
-	    pattern: /[|{}]/,
+		/* Special tokens used do delimit string templates */
+		pattern: /[|{}]/,
 		alias: "punctuation"
 	}],
 	'punctuation' : /[,.:()]/
diff --git a/components/prism-bsl.js b/components/prism-bsl.js
index f53a873606..b595552661 100644
--- a/components/prism-bsl.js
+++ b/components/prism-bsl.js
@@ -1,3 +1,5 @@
+/* eslint-disable no-misleading-character-class */
+
 // 1C:Enterprise
 // https://github.com/Diversus23/
 //
diff --git a/components/prism-coffeescript.js b/components/prism-coffeescript.js
index f1d52fb369..f17f85bdff 100644
--- a/components/prism-coffeescript.js
+++ b/components/prism-coffeescript.js
@@ -1,11 +1,11 @@
 (function(Prism) {
 
 // Ignore comments starting with { to privilege string interpolation highlighting
-var comment = /#(?!\{).+/,
-    interpolation = {
-    	pattern: /#\{[^}]+\}/,
-    	alias: 'variable'
-    };
+var comment = /#(?!\{).+/;
+var interpolation = {
+	pattern: /#\{[^}]+\}/,
+	alias: 'variable'
+};
 
 Prism.languages.coffeescript = Prism.languages.extend('javascript', {
 	'comment': comment,
diff --git a/components/prism-core.js b/components/prism-core.js
index 9a75c71741..a394de6bc4 100644
--- a/components/prism-core.js
+++ b/components/prism-core.js
@@ -426,8 +426,8 @@ var _ = {
 				if (o.hasOwnProperty(i)) {
 					callback.call(o, i, o[i], type || i);
 
-					var property = o[i],
-					    propertyType = _.util.type(property);
+					var property = o[i];
+					var propertyType = _.util.type(property);
 
 					if (propertyType === 'Object' && !visited[objId(property)]) {
 						visited[objId(property)] = true;
@@ -972,6 +972,7 @@ function matchGrammar(text, tokenList, grammar, startNode, startPos, rematch) {
 					}
 				}
 
+				// eslint-disable-next-line no-redeclare
 				var from = match.index,
 					matchStr = match[0],
 					before = str.slice(0, from),
diff --git a/components/prism-js-templates.js b/components/prism-js-templates.js
index d4b9f69b75..ac34b95812 100644
--- a/components/prism-js-templates.js
+++ b/components/prism-js-templates.js
@@ -170,7 +170,7 @@
 				var interpolationExpression = token.content;
 
 				var placeholder;
-				while (code.indexOf(placeholder = getPlaceholder(placeholderCounter++, language)) !== -1) { }
+				while (code.indexOf(placeholder = getPlaceholder(placeholderCounter++, language)) !== -1) { /* noop */ }
 				placeholderMap[placeholder] = interpolationExpression;
 				return placeholder;
 			}
diff --git a/components/prism-naniscript.js b/components/prism-naniscript.js
index 8f63e5356b..406d17e014 100644
--- a/components/prism-naniscript.js
+++ b/components/prism-naniscript.js
@@ -151,7 +151,7 @@
 			}
 		}
 		return stack.length === 0;
-	};
+	}
 
 	/**
 	 * @param {string | Token | (string | Token)[]} token
diff --git a/components/prism-nsis.js b/components/prism-nsis.js
index 563700adf1..60c34b88c4 100644
--- a/components/prism-nsis.js
+++ b/components/prism-nsis.js
@@ -16,7 +16,7 @@
 		pattern: /(^\s*)(?:Abort|Add(?:BrandingImage|Size)|AdvSplash|Allow(?:RootDirInstall|SkipFiles)|AutoCloseWindow|Banner|BG(?:Font|Gradient|Image)|BrandingText|BringToFront|Call(?:InstDLL)?|Caption|ChangeUI|CheckBitmap|ClearErrors|CompletedText|ComponentText|CopyFiles|CRCCheck|Create(?:Directory|Font|ShortCut)|Delete(?:INISec|INIStr|RegKey|RegValue)?|Detail(?:Print|sButtonText)|Dialer|Dir(?:Text|Var|Verify)|EnableWindow|Enum(?:RegKey|RegValue)|Exch|Exec(?:Shell(?:Wait)?|Wait)?|ExpandEnvStrings|File(?:BufSize|Close|ErrorText|Open|Read|ReadByte|ReadUTF16LE|ReadWord|WriteUTF16LE|Seek|Write|WriteByte|WriteWord)?|Find(?:Close|First|Next|Window)|FlushINI|Get(?:CurInstType|CurrentAddress|DlgItem|DLLVersion(?:Local)?|ErrorLevel|FileTime(?:Local)?|FullPathName|Function(?:Address|End)?|InstDirError|LabelAddress|TempFileName)|Goto|HideWindow|Icon|If(?:Abort|Errors|FileExists|RebootFlag|Silent)|InitPluginsDir|Install(?:ButtonText|Colors|Dir(?:RegKey)?)|InstProgressFlags|Inst(?:Type(?:GetText|SetText)?)|Int(?:64|Ptr)?CmpU?|Int(?:64)?Fmt|Int(?:Ptr)?Op|IsWindow|Lang(?:DLL|String)|License(?:BkColor|Data|ForceSelection|LangString|Text)|LoadLanguageFile|LockWindow|Log(?:Set|Text)|Manifest(?:DPIAware|SupportedOS)|Math|MessageBox|MiscButtonText|Name|Nop|ns(?:Dialogs|Exec)|NSISdl|OutFile|Page(?:Callbacks)?|PE(?:DllCharacteristics|SubsysVer)|Pop|Push|Quit|Read(?:EnvStr|INIStr|RegDWORD|RegStr)|Reboot|RegDLL|Rename|RequestExecutionLevel|ReserveFile|Return|RMDir|SearchPath|Section(?:End|GetFlags|GetInstTypes|GetSize|GetText|Group|In|SetFlags|SetInstTypes|SetSize|SetText)?|SendMessage|Set(?:AutoClose|BrandingImage|Compress|Compressor(?:DictSize)?|CtlColors|CurInstType|DatablockOptimize|DateSave|Details(?:Print|View)|ErrorLevel|Errors|FileAttributes|Font|OutPath|Overwrite|PluginUnload|RebootFlag|RegView|ShellVarContext|Silent)|Show(?:InstDetails|UninstDetails|Window)|Silent(?:Install|UnInstall)|Sleep|SpaceTexts|Splash|StartMenu|Str(?:CmpS?|Cpy|Len)|SubCaption|System|Unicode|Uninstall(?:ButtonText|Caption|Icon|SubCaption|Text)|UninstPage|UnRegDLL|UserInfo|Var|VI(?:AddVersionKey|FileVersion|ProductVersion)|VPatch|WindowIcon|Write(?:INIStr|Reg(?:Bin|DWORD|ExpandStr|MultiStr|None|Str)|Uninstaller)|XPStyle)\b/m,
 		lookbehind: true
 	},
-	 'property': /\b(?:admin|all|auto|both|colored|false|force|hide|highest|lastused|leave|listonly|none|normal|notset|off|on|open|print|show|silent|silentlog|smooth|textonly|true|user|ARCHIVE|FILE_(?:ATTRIBUTE_ARCHIVE|ATTRIBUTE_NORMAL|ATTRIBUTE_OFFLINE|ATTRIBUTE_READONLY|ATTRIBUTE_SYSTEM|ATTRIBUTE_TEMPORARY)|HK(?:(?:CR|CU|LM)(?:32|64)?|DD|PD|U)|HKEY_(?:CLASSES_ROOT|CURRENT_CONFIG|CURRENT_USER|DYN_DATA|LOCAL_MACHINE|PERFORMANCE_DATA|USERS)|ID(?:ABORT|CANCEL|IGNORE|NO|OK|RETRY|YES)|MB_(?:ABORTRETRYIGNORE|DEFBUTTON1|DEFBUTTON2|DEFBUTTON3|DEFBUTTON4|ICONEXCLAMATION|ICONINFORMATION|ICONQUESTION|ICONSTOP|OK|OKCANCEL|RETRYCANCEL|RIGHT|RTLREADING|SETFOREGROUND|TOPMOST|USERICON|YESNO)|NORMAL|OFFLINE|READONLY|SHCTX|SHELL_CONTEXT|SYSTEM|TEMPORARY)\b/,
+	'property': /\b(?:admin|all|auto|both|colored|false|force|hide|highest|lastused|leave|listonly|none|normal|notset|off|on|open|print|show|silent|silentlog|smooth|textonly|true|user|ARCHIVE|FILE_(?:ATTRIBUTE_ARCHIVE|ATTRIBUTE_NORMAL|ATTRIBUTE_OFFLINE|ATTRIBUTE_READONLY|ATTRIBUTE_SYSTEM|ATTRIBUTE_TEMPORARY)|HK(?:(?:CR|CU|LM)(?:32|64)?|DD|PD|U)|HKEY_(?:CLASSES_ROOT|CURRENT_CONFIG|CURRENT_USER|DYN_DATA|LOCAL_MACHINE|PERFORMANCE_DATA|USERS)|ID(?:ABORT|CANCEL|IGNORE|NO|OK|RETRY|YES)|MB_(?:ABORTRETRYIGNORE|DEFBUTTON1|DEFBUTTON2|DEFBUTTON3|DEFBUTTON4|ICONEXCLAMATION|ICONINFORMATION|ICONQUESTION|ICONSTOP|OK|OKCANCEL|RETRYCANCEL|RIGHT|RTLREADING|SETFOREGROUND|TOPMOST|USERICON|YESNO)|NORMAL|OFFLINE|READONLY|SHCTX|SHELL_CONTEXT|SYSTEM|TEMPORARY)\b/,
 	'constant': /\${[\w\.:\^-]+}|\$\([\w\.:\^-]+\)/i,
 	'variable': /\$\w+/i,
 	'number': /\b0x[\dA-Fa-f]+\b|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[Ee]-?\d+)?/,
diff --git a/components/prism-openqasm.js b/components/prism-openqasm.js
index 90048a90f8..9d24deb96f 100644
--- a/components/prism-openqasm.js
+++ b/components/prism-openqasm.js
@@ -11,7 +11,7 @@ Prism.languages.openqasm = {
 	'class-name': /\b(?:angle|bit|bool|creg|fixed|float|int|length|qreg|qubit|stretch|uint)\b/,
 	'function': /\b(?:sin|cos|tan|exp|ln|sqrt|rotl|rotr|popcount)\b(?=\s*\()/,
 
-	'constant': /\b(?:pi|tau|euler)\b|[π𝜏ℇ]/,
+	'constant': /\b(?:pi|tau|euler)\b|π|𝜏|ℇ/,
 	'number': {
 		pattern: /(^|[^.\w$])(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?(?:dt|ns|us|µs|ms|s)?/i,
 		lookbehind: true
diff --git a/components/prism-openqasm.min.js b/components/prism-openqasm.min.js
index 695a80832b..ff18c65930 100644
--- a/components/prism-openqasm.min.js
+++ b/components/prism-openqasm.min.js
@@ -1 +1 @@
-Prism.languages.openqasm={comment:/\/\*[\s\S]*?\*\/|\/\/.*/,string:{pattern:/"[^"\r\n\t]*"|'[^'\r\n\t]*'/,greedy:!0},keyword:/\b(?:barrier|boxas|boxto|break|const|continue|ctrl|def|defcal|defcalgrammar|delay|else|end|for|gate|gphase|if|in|include|inv|kernel|lengthof|let|measure|pow|reset|return|rotary|stretchinf|while|CX|OPENQASM|U)\b|#pragma\b/,"class-name":/\b(?:angle|bit|bool|creg|fixed|float|int|length|qreg|qubit|stretch|uint)\b/,function:/\b(?:sin|cos|tan|exp|ln|sqrt|rotl|rotr|popcount)\b(?=\s*\()/,constant:/\b(?:pi|tau|euler)\b|[π𝜏ℇ]/,number:{pattern:/(^|[^.\w$])(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?(?:dt|ns|us|µs|ms|s)?/i,lookbehind:!0},operator:/->|>>=?|<<=?|&&|\|\||\+\+|--|[!=<>&|~^+\-*/%]=?|@/,punctuation:/[(){}\[\];,:.]/},Prism.languages.qasm=Prism.languages.openqasm;
\ No newline at end of file
+Prism.languages.openqasm={comment:/\/\*[\s\S]*?\*\/|\/\/.*/,string:{pattern:/"[^"\r\n\t]*"|'[^'\r\n\t]*'/,greedy:!0},keyword:/\b(?:barrier|boxas|boxto|break|const|continue|ctrl|def|defcal|defcalgrammar|delay|else|end|for|gate|gphase|if|in|include|inv|kernel|lengthof|let|measure|pow|reset|return|rotary|stretchinf|while|CX|OPENQASM|U)\b|#pragma\b/,"class-name":/\b(?:angle|bit|bool|creg|fixed|float|int|length|qreg|qubit|stretch|uint)\b/,function:/\b(?:sin|cos|tan|exp|ln|sqrt|rotl|rotr|popcount)\b(?=\s*\()/,constant:/\b(?:pi|tau|euler)\b|π|𝜏|ℇ/,number:{pattern:/(^|[^.\w$])(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?(?:dt|ns|us|µs|ms|s)?/i,lookbehind:!0},operator:/->|>>=?|<<=?|&&|\|\||\+\+|--|[!=<>&|~^+\-*/%]=?|@/,punctuation:/[(){}\[\];,:.]/},Prism.languages.qasm=Prism.languages.openqasm;
\ No newline at end of file
diff --git a/components/prism-parser.js b/components/prism-parser.js
index 059ea819a3..0502b76d0c 100644
--- a/components/prism-parser.js
+++ b/components/prism-parser.js
@@ -58,7 +58,7 @@
 		}
 	});
 
-	parser = Prism.languages.insertBefore('inside', 'punctuation', {
+	Prism.languages.insertBefore('inside', 'punctuation', {
 		'expression': parser.expression,
 		'keyword': parser.keyword,
 		'variable': parser.variable,
diff --git a/components/prism-parser.min.js b/components/prism-parser.min.js
index 63c8203657..640f4de706 100644
--- a/components/prism-parser.min.js
+++ b/components/prism-parser.min.js
@@ -1 +1 @@
-!function(e){var n=e.languages.parser=e.languages.extend("markup",{keyword:{pattern:/(^|[^^])(?:\^(?:case|eval|for|if|switch|throw)\b|@(?:BASE|CLASS|GET(?:_DEFAULT)?|OPTIONS|SET_DEFAULT|USE)\b)/,lookbehind:!0},variable:{pattern:/(^|[^^])\B\$(?:\w+|(?=[.{]))(?:(?:\.|::?)\w+)*(?:\.|::?)?/,lookbehind:!0,inside:{punctuation:/\.|:+/}},function:{pattern:/(^|[^^])\B[@^]\w+(?:(?:\.|::?)\w+)*(?:\.|::?)?/,lookbehind:!0,inside:{keyword:{pattern:/(^@)(?:GET_|SET_)/,lookbehind:!0},punctuation:/\.|:+/}},escape:{pattern:/\^(?:[$^;@()\[\]{}"':]|#[a-f\d]*)/i,alias:"builtin"},punctuation:/[\[\](){};]/});n=e.languages.insertBefore("parser","keyword",{"parser-comment":{pattern:/(\s)#.*/,lookbehind:!0,alias:"comment"},expression:{pattern:/(^|[^^])\((?:[^()]|\((?:[^()]|\((?:[^()])*\))*\))*\)/,greedy:!0,lookbehind:!0,inside:{string:{pattern:/(^|[^^])(["'])(?:(?!\2)[^^]|\^[\s\S])*\2/,lookbehind:!0},keyword:n.keyword,variable:n.variable,function:n.function,boolean:/\b(?:true|false)\b/,number:/\b(?:0x[a-f\d]+|\d+(?:\.\d*)?(?:e[+-]?\d+)?)\b/i,escape:n.escape,operator:/[~+*\/\\%]|!(?:\|\|?|=)?|&&?|\|\|?|==|<[<=]?|>[>=]?|-[fd]?|\b(?:def|eq|ge|gt|in|is|le|lt|ne)\b/,punctuation:n.punctuation}}}),n=e.languages.insertBefore("inside","punctuation",{expression:n.expression,keyword:n.keyword,variable:n.variable,function:n.function,escape:n.escape,"parser-punctuation":{pattern:n.punctuation,alias:"punctuation"}},n.tag.inside["attr-value"])}(Prism);
\ No newline at end of file
+!function(e){var n=e.languages.parser=e.languages.extend("markup",{keyword:{pattern:/(^|[^^])(?:\^(?:case|eval|for|if|switch|throw)\b|@(?:BASE|CLASS|GET(?:_DEFAULT)?|OPTIONS|SET_DEFAULT|USE)\b)/,lookbehind:!0},variable:{pattern:/(^|[^^])\B\$(?:\w+|(?=[.{]))(?:(?:\.|::?)\w+)*(?:\.|::?)?/,lookbehind:!0,inside:{punctuation:/\.|:+/}},function:{pattern:/(^|[^^])\B[@^]\w+(?:(?:\.|::?)\w+)*(?:\.|::?)?/,lookbehind:!0,inside:{keyword:{pattern:/(^@)(?:GET_|SET_)/,lookbehind:!0},punctuation:/\.|:+/}},escape:{pattern:/\^(?:[$^;@()\[\]{}"':]|#[a-f\d]*)/i,alias:"builtin"},punctuation:/[\[\](){};]/});n=e.languages.insertBefore("parser","keyword",{"parser-comment":{pattern:/(\s)#.*/,lookbehind:!0,alias:"comment"},expression:{pattern:/(^|[^^])\((?:[^()]|\((?:[^()]|\((?:[^()])*\))*\))*\)/,greedy:!0,lookbehind:!0,inside:{string:{pattern:/(^|[^^])(["'])(?:(?!\2)[^^]|\^[\s\S])*\2/,lookbehind:!0},keyword:n.keyword,variable:n.variable,function:n.function,boolean:/\b(?:true|false)\b/,number:/\b(?:0x[a-f\d]+|\d+(?:\.\d*)?(?:e[+-]?\d+)?)\b/i,escape:n.escape,operator:/[~+*\/\\%]|!(?:\|\|?|=)?|&&?|\|\|?|==|<[<=]?|>[>=]?|-[fd]?|\b(?:def|eq|ge|gt|in|is|le|lt|ne)\b/,punctuation:n.punctuation}}}),e.languages.insertBefore("inside","punctuation",{expression:n.expression,keyword:n.keyword,variable:n.variable,function:n.function,escape:n.escape,"parser-punctuation":{pattern:n.punctuation,alias:"punctuation"}},n.tag.inside["attr-value"])}(Prism);
\ No newline at end of file
diff --git a/components/prism-pure.js b/components/prism-pure.js
index c916365da3..accfac46e4 100644
--- a/components/prism-pure.js
+++ b/components/prism-pure.js
@@ -44,6 +44,7 @@
 			alias: 'builtin'
 		},
 		// Any combination of operator chars can be an operator
+		// eslint-disable-next-line no-misleading-character-class
 		'operator': /(?:[!"#$%&'*+,\-.\/:<=>?@\\^`|~\u00a1-\u00bf\u00d7-\u00f7\u20d0-\u2bff]|\b_+\b)+|\b(?:and|div|mod|not|or)\b/,
 		// FIXME: How can we prevent | and , to be highlighted as operator when they are used alone?
 		'punctuation': /[(){}\[\];,|]/
diff --git a/components/prism-robotframework.js b/components/prism-robotframework.js
index df925ff3be..8e043452eb 100644
--- a/components/prism-robotframework.js
+++ b/components/prism-robotframework.js
@@ -28,7 +28,7 @@
 		}
 
 		extendecInside['tag'] = {
-			pattern: /([\r\n](?:  |\t)[ \t]*)\[[-\w]+\]/,
+			pattern: /([\r\n](?: {2}|\t)[ \t]*)\[[-\w]+\]/,
 			lookbehind: true,
 			inside: {
 				'punctuation': /\[|\]/
@@ -46,7 +46,7 @@
 
 
 	var docTag = {
-		pattern: /(\[Documentation\](?:  |\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,
+		pattern: /(\[Documentation\](?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,
 		lookbehind: true,
 		alias: 'string'
 	};
@@ -61,7 +61,7 @@
 	};
 
 	var testPropertyLike = {
-		pattern: /([\r\n](?:  |\t)[ \t]*)(?!\[|\.{3}|#)(?:\S(?:[ \t]\S)*)+/,
+		pattern: /([\r\n](?: {2}|\t)[ \t]*)(?!\[|\.{3}|#)(?:\S(?:[ \t]\S)*)+/,
 		lookbehind: true,
 		inside: {
 			'variable': variable
@@ -71,7 +71,7 @@
 	Prism.languages['robotframework'] = {
 		'settings': createSection('Settings', {
 			'documentation': {
-				pattern: /([\r\n] ?Documentation(?:  |\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,
+				pattern: /([\r\n] ?Documentation(?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,
 				lookbehind: true,
 				alias: 'string'
 			},
diff --git a/components/prism-robotframework.min.js b/components/prism-robotframework.min.js
index 0e388aa70c..bfaec75744 100644
--- a/components/prism-robotframework.min.js
+++ b/components/prism-robotframework.min.js
@@ -1 +1 @@
-!function(t){var r={pattern:/(^[ \t]*| {2}|\t)#.*/m,lookbehind:!0,greedy:!0},o={pattern:/((?:^|[^\\])(?:\\{2})*)[$@&%]\{(?:[^{}\r\n]|\{[^{}\r\n]*\})*\}/,lookbehind:!0,inside:{punctuation:/^[$@&%]\{|\}$/}};function n(t,n){var e={"section-header":{pattern:/^ ?\*{3}.+?\*{3}/,alias:"keyword"}};for(var a in n)e[a]=n[a];return e.tag={pattern:/([\r\n](?:  |\t)[ \t]*)\[[-\w]+\]/,lookbehind:!0,inside:{punctuation:/\[|\]/}},e.variable=o,e.comment=r,{pattern:RegExp("^ ?\\*{3}[ \t]*<name>[ \t]*\\*{3}(?:.|[\r\n](?!\\*{3}))*".replace(/<name>/g,function(){return t}),"im"),alias:"section",inside:e}}var e={pattern:/(\[Documentation\](?:  |\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},a={pattern:/([\r\n] ?)(?!#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,alias:"function",inside:{variable:o}},i={pattern:/([\r\n](?:  |\t)[ \t]*)(?!\[|\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,inside:{variable:o}};t.languages.robotframework={settings:n("Settings",{documentation:{pattern:/([\r\n] ?Documentation(?:  |\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},property:{pattern:/([\r\n] ?)(?!\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0}}),variables:n("Variables"),"test-cases":n("Test Cases",{"test-name":a,documentation:e,property:i}),keywords:n("Keywords",{"keyword-name":a,documentation:e,property:i}),tasks:n("Tasks",{"task-name":a,documentation:e,property:i}),comment:r},t.languages.robot=t.languages.robotframework}(Prism);
\ No newline at end of file
+!function(t){var r={pattern:/(^[ \t]*| {2}|\t)#.*/m,lookbehind:!0,greedy:!0},o={pattern:/((?:^|[^\\])(?:\\{2})*)[$@&%]\{(?:[^{}\r\n]|\{[^{}\r\n]*\})*\}/,lookbehind:!0,inside:{punctuation:/^[$@&%]\{|\}$/}};function n(t,n){var e={"section-header":{pattern:/^ ?\*{3}.+?\*{3}/,alias:"keyword"}};for(var a in n)e[a]=n[a];return e.tag={pattern:/([\r\n](?: {2}|\t)[ \t]*)\[[-\w]+\]/,lookbehind:!0,inside:{punctuation:/\[|\]/}},e.variable=o,e.comment=r,{pattern:RegExp("^ ?\\*{3}[ \t]*<name>[ \t]*\\*{3}(?:.|[\r\n](?!\\*{3}))*".replace(/<name>/g,function(){return t}),"im"),alias:"section",inside:e}}var e={pattern:/(\[Documentation\](?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},a={pattern:/([\r\n] ?)(?!#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,alias:"function",inside:{variable:o}},i={pattern:/([\r\n](?: {2}|\t)[ \t]*)(?!\[|\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,inside:{variable:o}};t.languages.robotframework={settings:n("Settings",{documentation:{pattern:/([\r\n] ?Documentation(?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},property:{pattern:/([\r\n] ?)(?!\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0}}),variables:n("Variables"),"test-cases":n("Test Cases",{"test-name":a,documentation:e,property:i}),keywords:n("Keywords",{"keyword-name":a,documentation:e,property:i}),tasks:n("Tasks",{"task-name":a,documentation:e,property:i}),comment:r},t.languages.robot=t.languages.robotframework}(Prism);
\ No newline at end of file
diff --git a/dependencies.js b/dependencies.js
index 8b8a85c989..7eeb8d15bc 100644
--- a/dependencies.js
+++ b/dependencies.js
@@ -224,8 +224,8 @@ var getLoader = (function () {
 	 * @template T
 	 */
 	function loadComponentsInOrder(dependencyResolver, ids, loadComponent, chainer) {
-		const series = chainer ? chainer.series : undefined;
-		const parallel = chainer ? chainer.parallel : noop;
+		var series = chainer ? chainer.series : undefined;
+		var parallel = chainer ? chainer.parallel : noop;
 
 		/** @type {Object<string, T>} */
 		var cache = {};
diff --git a/docs/global.html b/docs/global.html
index afcfd9f0e6..4dc4720ff8 100644
--- a/docs/global.html
+++ b/docs/global.html
@@ -143,7 +143,7 @@ <h4 class="name" id="Grammar">Grammar</h4>
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1196">line 1196</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1197">line 1197</a>
     </li></ul></dd>
     
 
@@ -274,7 +274,7 @@ <h4 class="name" id="GrammarToken">GrammarToken</h4>
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1175">line 1175</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1176">line 1176</a>
     </li></ul></dd>
     
 
@@ -559,7 +559,7 @@ <h4 class="name" id="HighlightCallback"><span class="type-signature"></span>High
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1204">line 1204</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1205">line 1205</a>
     </li></ul></dd>
     
 
@@ -713,7 +713,7 @@ <h4 class="name" id="HookCallback"><span class="type-signature"></span>HookCallb
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1214">line 1214</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1215">line 1215</a>
     </li></ul></dd>
     
 
diff --git a/docs/prism-core.js.html b/docs/prism-core.js.html
index 53f95c1263..b98ec14d2a 100644
--- a/docs/prism-core.js.html
+++ b/docs/prism-core.js.html
@@ -479,8 +479,8 @@ <h1 class="page-title">prism-core.js</h1>
 				if (o.hasOwnProperty(i)) {
 					callback.call(o, i, o[i], type || i);
 
-					var property = o[i],
-					    propertyType = _.util.type(property);
+					var property = o[i];
+					var propertyType = _.util.type(property);
 
 					if (propertyType === 'Object' &amp;&amp; !visited[objId(property)]) {
 						visited[objId(property)] = true;
@@ -1025,6 +1025,7 @@ <h1 class="page-title">prism-core.js</h1>
 					}
 				}
 
+				// eslint-disable-next-line no-redeclare
 				var from = match.index,
 					matchStr = match[0],
 					before = str.slice(0, from),
diff --git a/gulpfile.js/index.js b/gulpfile.js/index.js
index f2412c6f5e..048b290ea6 100644
--- a/gulpfile.js/index.js
+++ b/gulpfile.js/index.js
@@ -34,7 +34,7 @@ function inlineRegexSource() {
 		/\/((?:[^\n\r[\\\/]|\\.|\[(?:[^\n\r\\\]]|\\.)*\])+)\/\s*\.\s*source\b/g,
 		(m, source) => {
 			// escape backslashes
-			source = source.replace(/\\(.)|\[(\\s\\S|\\S\\s)\]/g, function (m, g1, g2) {
+			source = source.replace(/\\(.)|\[(?:\\s\\S|\\S\\s)\]/g, function (m, g1) {
 				if (g1) {
 					// characters like /\n/ can just be kept as "\n" instead of being escaped to "\\n"
 					if (/[nrt0/]/.test(g1)) {
diff --git a/package-lock.json b/package-lock.json
index a93c8168f6..38c7480af1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,32 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+      "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.13.10",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.13.10.tgz",
+      "integrity": "sha512-5aPpe5XQPzflQrFwL1/QoeHkP2MsA4JCntcXHRhEsdsfPVkvPi2w7Qix4iV7t5S/oC9OodGrggd8aco1g3SZFg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.12.11",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
     "@babel/parser": {
       "version": "7.10.3",
       "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.10.3.tgz",
@@ -20,6 +46,89 @@
         "regenerator-runtime": "^0.13.4"
       }
     },
+    "@eslint/eslintrc": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.0.tgz",
+      "integrity": "sha512-2ZPCc+uNbjV5ERJr+aKSPRwZgKd2z11x0EgLvb1PURmUrn9QNRXFqje0Ldq454PfAVyaJYyrDvvIKSFP4NnBog==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "debug": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
+          "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "fast-deep-equal": {
+          "version": "3.1.3",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+          "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
+          "dev": true
+        },
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "import-fresh": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
+          "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
+          "dev": true,
+          "requires": {
+            "parent-module": "^1.0.0",
+            "resolve-from": "^4.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "resolve-from": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+          "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+          "dev": true
+        },
+        "strip-json-comments": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+          "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+          "dev": true
+        }
+      }
+    },
     "@mrmlnc/readdir-enhanced": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
@@ -279,6 +388,12 @@
         "acorn-walk": "^6.0.1"
       }
     },
+    "acorn-jsx": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "dev": true
+    },
     "acorn-walk": {
       "version": "6.1.1",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
@@ -553,6 +668,12 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "astral-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
+      "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==",
+      "dev": true
+    },
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@@ -2506,6 +3045,23 @@
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@@ -2992,6 +3548,12 @@
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@@ -3346,6 +3908,12 @@
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@@ -3868,6 +4436,15 @@
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@@ -4405,6 +4982,12 @@
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+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-4.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "ansi-styles": "^4.0.0",
+        "astral-regex": "^2.0.0",
+        "is-fullwidth-code-point": "^3.0.0"
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+      "dependencies": {
+        "ansi-styles": {
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+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+          "dev": true,
+          "requires": {
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+          }
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+        "color-name": {
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+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
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@@ -6238,12 +6887,100 @@
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+        "lodash": "^4.17.20",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.0"
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+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-7.2.3.tgz",
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+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "json-schema-traverse": "^1.0.0",
+            "require-from-string": "^2.0.2",
+            "uri-js": "^4.2.2"
+          }
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+        "emoji-regex": {
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+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
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+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
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+          "dev": true
+        },
+        "lodash": {
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+          "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
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+          "dev": true,
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
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+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
     "taffydb": {
       "version": "2.6.2",
       "resolved": "https://registry.npmjs.org/taffydb/-/taffydb-2.6.2.tgz",
       "integrity": "sha1-fLy2S1oUG2ou/CxdLGe04VCyomg=",
       "dev": true
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "textextensions": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/textextensions/-/textextensions-2.4.0.tgz",
@@ -6434,6 +7171,12 @@
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       "dev": true
     },
+    "type-fest": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+      "dev": true
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -6640,6 +7383,12 @@
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
+      "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
+      "dev": true
+    },
     "v8flags": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
@@ -6914,6 +7663,12 @@
         "execa": "^1.0.0"
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -6997,6 +7752,12 @@
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
       "dev": true
     },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
+    },
     "yargs": {
       "version": "13.2.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
diff --git a/package.json b/package.json
index 1c13095f60..c8a9e94463 100755
--- a/package.json
+++ b/package.json
@@ -7,6 +7,8 @@
   "scripts": {
     "build": "gulp",
     "start": "http-server -c-1",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
     "test:aliases": "mocha tests/aliases-test.js",
     "test:core": "mocha tests/core/**/*.js",
     "test:dependencies": "mocha tests/dependencies-test.js",
@@ -34,6 +36,7 @@
     "danger": "^10.5.0",
     "del": "^4.1.1",
     "docdash": "^1.2.0",
+    "eslint": "^7.22.0",
     "gulp": "^4.0.2",
     "gulp-concat": "^2.3.4",
     "gulp-header": "^2.0.7",
diff --git a/plugins/autolinker/prism-autolinker.js b/plugins/autolinker/prism-autolinker.js
index 51e9a2a820..62cd1e11a3 100644
--- a/plugins/autolinker/prism-autolinker.js
+++ b/plugins/autolinker/prism-autolinker.js
@@ -71,7 +71,7 @@ Prism.hooks.add('wrap', function(env) {
 		// Silently catch any error thrown by decodeURIComponent (#1186)
 		try {
 			env.content = decodeURIComponent(env.content);
-		} catch(e) {}
+		} catch(e) { /* noop */ }
 	}
 });
 
diff --git a/plugins/autoloader/prism-autoloader.js b/plugins/autoloader/prism-autoloader.js
index 6a54c92ab2..7134d8215b 100644
--- a/plugins/autoloader/prism-autoloader.js
+++ b/plugins/autoloader/prism-autoloader.js
@@ -443,7 +443,7 @@
 					languageCallback(lang, 'error');
 				});
 			}
-		};
+		}
 
 		var dependencies = lang_dependencies[lang];
 		if (dependencies && dependencies.length) {
diff --git a/plugins/jsonp-highlight/prism-jsonp-highlight.js b/plugins/jsonp-highlight/prism-jsonp-highlight.js
index 27a693e6aa..81d2833961 100644
--- a/plugins/jsonp-highlight/prism-jsonp-highlight.js
+++ b/plugins/jsonp-highlight/prism-jsonp-highlight.js
@@ -50,6 +50,7 @@
 			}
 		}
 		else if (typeof adapter === "string") {
+			// eslint-disable-next-line no-redeclare
 			for (var i = 0, item; item = adapters[i++];) {
 				if (item.name === adapter) {
 					return item.adapter;
@@ -78,7 +79,7 @@
 		}
 	}
 
-	registerAdapter(function github(rsp, el) {
+	registerAdapter(function github(rsp) {
 		if (rsp && rsp.meta && rsp.data) {
 			if (rsp.meta.status && rsp.meta.status >= 400) {
 				return "Error: " + (rsp.data.message || rsp.meta.status);
@@ -118,7 +119,7 @@
 		}
 		return null;
 	}, 'gist');
-	registerAdapter(function bitbucket(rsp, el) {
+	registerAdapter(function bitbucket(rsp) {
 		if (rsp && rsp.node && typeof (rsp.data) === "string") {
 			return rsp.data;
 		}
diff --git a/plugins/jsonp-highlight/prism-jsonp-highlight.min.js b/plugins/jsonp-highlight/prism-jsonp-highlight.min.js
index fc92a7d71b..dde26c0144 100644
--- a/plugins/jsonp-highlight/prism-jsonp-highlight.min.js
+++ b/plugins/jsonp-highlight/prism-jsonp-highlight.min.js
@@ -1 +1 @@
-!function(){if("undefined"!=typeof Prism&&"undefined"!=typeof document){var c=[];t(function(t,e){if(t&&t.meta&&t.data){if(t.meta.status&&400<=t.meta.status)return"Error: "+(t.data.message||t.meta.status);if("string"==typeof t.data.content)return"function"==typeof atob?atob(t.data.content.replace(/\s/g,"")):"Your browser cannot decode base64"}return null},"github"),t(function(t,e){if(t&&t.meta&&t.data&&t.data.files){if(t.meta.status&&400<=t.meta.status)return"Error: "+(t.data.message||t.meta.status);var n=t.data.files,a=e.getAttribute("data-filename");if(null==a)for(var r in n)if(n.hasOwnProperty(r)){a=r;break}return void 0!==n[a]?n[a].content:"Error: unknown or missing gist file "+a}return null},"gist"),t(function(t,e){return t&&t.node&&"string"==typeof t.data?t.data:null},"bitbucket");var m=0,p="data-jsonp-status",g="loading",h="loaded",v="failed",b="pre[data-jsonp]:not(["+p+'="'+h+'"]):not(['+p+'="'+g+'"])';Prism.hooks.add("before-highlightall",function(t){t.selector+=", "+b}),Prism.hooks.add("before-sanity-check",function(t){var r=t.element;if(r.matches(b)){t.code="",r.setAttribute(p,g);var i=r.appendChild(document.createElement("CODE"));i.textContent="Loading…";var e=t.language;i.className="language-"+e;var n=Prism.plugins.autoloader;n&&n.loadLanguages(e);var a=r.getAttribute("data-adapter"),o=null;if(a){if("function"!=typeof window[a])return r.setAttribute(p,v),void(i.textContent=function(t){return'✖ Error: JSONP adapter function "'+t+"\" doesn't exist"}(a));o=window[a]}var u="prismjsonp"+m++,s=document.createElement("a"),d=s.href=r.getAttribute("data-jsonp");s.href+=(s.search?"&":"?")+(r.getAttribute("data-callback")||"callback")+"="+u;var f=setTimeout(function(){r.setAttribute(p,v),i.textContent=function(t){return"✖ Error: Timeout loading "+t}(d)},Prism.plugins.jsonphighlight.timeout),l=document.createElement("script");l.src=s.href,window[u]=function(t){document.head.removeChild(l),clearTimeout(f),delete window[u];var e=null;if(o)e=o(t,r);else for(var n=0,a=c.length;n<a&&null===(e=c[n].adapter(t,r));n++);null===e?(r.setAttribute(p,v),i.textContent="✖ Error: Cannot parse response (perhaps you need an adapter function?)"):(r.setAttribute(p,h),i.textContent=e,Prism.highlightElement(i))},document.head.appendChild(l)}}),Prism.plugins.jsonphighlight={timeout:5e3,registerAdapter:t,removeAdapter:function(e){if("string"==typeof e&&(e=n(e)),"function"==typeof e){var t=c.findIndex(function(t){return t.adapter===e});0<=t&&c.splice(t,1)}},highlight:function(t){for(var e,n=(t||document).querySelectorAll(b),a=0;e=n[a++];)Prism.highlightElement(e)}}}function t(t,e){e=e||t.name,"function"!=typeof t||n(t)||n(e)||c.push({adapter:t,name:e})}function n(t){if("function"==typeof t){for(var e=0;n=c[e++];)if(n.adapter.valueOf()===t.valueOf())return n.adapter}else if("string"==typeof t){var n;for(e=0;n=c[e++];)if(n.name===t)return n.adapter}return null}}();
\ No newline at end of file
+!function(){if("undefined"!=typeof Prism&&"undefined"!=typeof document){var c=[];t(function(t){if(t&&t.meta&&t.data){if(t.meta.status&&400<=t.meta.status)return"Error: "+(t.data.message||t.meta.status);if("string"==typeof t.data.content)return"function"==typeof atob?atob(t.data.content.replace(/\s/g,"")):"Your browser cannot decode base64"}return null},"github"),t(function(t,e){if(t&&t.meta&&t.data&&t.data.files){if(t.meta.status&&400<=t.meta.status)return"Error: "+(t.data.message||t.meta.status);var n=t.data.files,a=e.getAttribute("data-filename");if(null==a)for(var r in n)if(n.hasOwnProperty(r)){a=r;break}return void 0!==n[a]?n[a].content:"Error: unknown or missing gist file "+a}return null},"gist"),t(function(t){return t&&t.node&&"string"==typeof t.data?t.data:null},"bitbucket");var m=0,p="data-jsonp-status",g="loading",h="loaded",v="failed",b="pre[data-jsonp]:not(["+p+'="'+h+'"]):not(['+p+'="'+g+'"])';Prism.hooks.add("before-highlightall",function(t){t.selector+=", "+b}),Prism.hooks.add("before-sanity-check",function(t){var r=t.element;if(r.matches(b)){t.code="",r.setAttribute(p,g);var i=r.appendChild(document.createElement("CODE"));i.textContent="Loading…";var e=t.language;i.className="language-"+e;var n=Prism.plugins.autoloader;n&&n.loadLanguages(e);var a=r.getAttribute("data-adapter"),o=null;if(a){if("function"!=typeof window[a])return r.setAttribute(p,v),void(i.textContent=function(t){return'✖ Error: JSONP adapter function "'+t+"\" doesn't exist"}(a));o=window[a]}var u="prismjsonp"+m++,s=document.createElement("a"),d=s.href=r.getAttribute("data-jsonp");s.href+=(s.search?"&":"?")+(r.getAttribute("data-callback")||"callback")+"="+u;var f=setTimeout(function(){r.setAttribute(p,v),i.textContent=function(t){return"✖ Error: Timeout loading "+t}(d)},Prism.plugins.jsonphighlight.timeout),l=document.createElement("script");l.src=s.href,window[u]=function(t){document.head.removeChild(l),clearTimeout(f),delete window[u];var e=null;if(o)e=o(t,r);else for(var n=0,a=c.length;n<a&&null===(e=c[n].adapter(t,r));n++);null===e?(r.setAttribute(p,v),i.textContent="✖ Error: Cannot parse response (perhaps you need an adapter function?)"):(r.setAttribute(p,h),i.textContent=e,Prism.highlightElement(i))},document.head.appendChild(l)}}),Prism.plugins.jsonphighlight={timeout:5e3,registerAdapter:t,removeAdapter:function(e){if("string"==typeof e&&(e=n(e)),"function"==typeof e){var t=c.findIndex(function(t){return t.adapter===e});0<=t&&c.splice(t,1)}},highlight:function(t){for(var e,n=(t||document).querySelectorAll(b),a=0;e=n[a++];)Prism.highlightElement(e)}}}function t(t,e){e=e||t.name,"function"!=typeof t||n(t)||n(e)||c.push({adapter:t,name:e})}function n(t){if("function"==typeof t){for(var e=0;n=c[e++];)if(n.adapter.valueOf()===t.valueOf())return n.adapter}else if("string"==typeof t){var n;for(e=0;n=c[e++];)if(n.name===t)return n.adapter}return null}}();
\ No newline at end of file
diff --git a/plugins/normalize-whitespace/prism-normalize-whitespace.js b/plugins/normalize-whitespace/prism-normalize-whitespace.js
index 5aee00a513..46aa590579 100644
--- a/plugins/normalize-whitespace/prism-normalize-whitespace.js
+++ b/plugins/normalize-whitespace/prism-normalize-whitespace.js
@@ -97,8 +97,8 @@ NormalizeWhitespace.prototype = {
 			if (tabLen(lines[i]) <= characters)
 				continue;
 
-			var line = lines[i].split(/(\s+)/g),
-			    len = 0;
+			var line = lines[i].split(/(\s+)/g);
+			var len = 0;
 
 			for (var j = 0; j < line.length; ++j) {
 				var tl = tabLen(line[j]);
@@ -161,10 +161,10 @@ Prism.hooks.add('before-sanity-check', function (env) {
 		return;
 	}
 
-	var children = pre.childNodes,
-	    before = '',
-	    after = '',
-	    codeFound = false;
+	var children = pre.childNodes;
+	var before = '';
+	var after = '';
+	var codeFound = false;
 
 	// Move surrounding whitespace from the <pre> tag into the <code> tag
 	for (var i = 0; i < children.length; ++i) {
diff --git a/plugins/show-invisibles/prism-show-invisibles.js b/plugins/show-invisibles/prism-show-invisibles.js
index 735add9df1..152064e3e2 100644
--- a/plugins/show-invisibles/prism-show-invisibles.js
+++ b/plugins/show-invisibles/prism-show-invisibles.js
@@ -41,6 +41,7 @@
 				break;
 
 			default: // 'Object'
+				// eslint-disable-next-line no-redeclare
 				var inside = value.inside || (value.inside = {});
 				addInvisibles(inside);
 				break;
@@ -64,6 +65,7 @@
 			}
 		}
 
+		// eslint-disable-next-line no-redeclare
 		for (var name in grammar) {
 			if (grammar.hasOwnProperty(name) && !invisibles[name]) {
 				if (name === 'rest') {
diff --git a/plugins/toolbar/prism-toolbar.js b/plugins/toolbar/prism-toolbar.js
index 51da74f766..98ba9004b2 100644
--- a/plugins/toolbar/prism-toolbar.js
+++ b/plugins/toolbar/prism-toolbar.js
@@ -154,7 +154,7 @@
 		try {
 			// Any normal text will blow up this selector.
 			template = document.querySelector('template#' + text);
-		} catch (e) {}
+		} catch (e) { /* noop */ }
 
 		if (template) {
 			element = template.content;
diff --git a/plugins/treeview/prism-treeview.js b/plugins/treeview/prism-treeview.js
index ac248a32f8..945668320a 100644
--- a/plugins/treeview/prism-treeview.js
+++ b/plugins/treeview/prism-treeview.js
@@ -14,7 +14,7 @@
 						alias: 'line-h'
 					},
 					{
-						pattern: /\|   |│   /,
+						pattern: /\| {3}|│ {3}/,
 						alias: 'line-v'
 					},
 					{
diff --git a/plugins/treeview/prism-treeview.min.js b/plugins/treeview/prism-treeview.min.js
index 8a5aaef3d7..7c59a60f75 100644
--- a/plugins/treeview/prism-treeview.min.js
+++ b/plugins/treeview/prism-treeview.min.js
@@ -1 +1 @@
-"undefined"!=typeof Prism&&(Prism.languages.treeview={"treeview-part":{pattern:/^.+/m,inside:{"entry-line":[{pattern:/\|-- |├── /,alias:"line-h"},{pattern:/\|   |│   /,alias:"line-v"},{pattern:/`-- |└── /,alias:"line-v-last"},{pattern:/ {4}/,alias:"line-v-gap"}],"entry-name":{pattern:/.*\S.*/,inside:{operator:/ -> /}}}}},Prism.hooks.add("wrap",function(e){if("treeview"===e.language&&"entry-name"===e.type){var t=e.classes,n=/(^|[^\\])\/\s*$/;if(n.test(e.content))e.content=e.content.replace(n,"$1"),t.push("dir");else{e.content=e.content.replace(/(^|[^\\])[=*|]\s*$/,"$1");for(var a=e.content.toLowerCase().replace(/\s+/g,"").split(".");1<a.length;)a.shift(),t.push("ext-"+a.join("-"))}"."===e.content[0]&&t.push("dotfile")}}));
\ No newline at end of file
+"undefined"!=typeof Prism&&(Prism.languages.treeview={"treeview-part":{pattern:/^.+/m,inside:{"entry-line":[{pattern:/\|-- |├── /,alias:"line-h"},{pattern:/\| {3}|│ {3}/,alias:"line-v"},{pattern:/`-- |└── /,alias:"line-v-last"},{pattern:/ {4}/,alias:"line-v-gap"}],"entry-name":{pattern:/.*\S.*/,inside:{operator:/ -> /}}}}},Prism.hooks.add("wrap",function(e){if("treeview"===e.language&&"entry-name"===e.type){var t=e.classes,n=/(^|[^\\])\/\s*$/;if(n.test(e.content))e.content=e.content.replace(n,"$1"),t.push("dir");else{e.content=e.content.replace(/(^|[^\\])[=*|]\s*$/,"$1");for(var a=e.content.toLowerCase().replace(/\s+/g,"").split(".");1<a.length;)a.shift(),t.push("ext-"+a.join("-"))}"."===e.content[0]&&t.push("dotfile")}}));
\ No newline at end of file
diff --git a/prism.js b/prism.js
index 95455b4963..f7ec30d731 100644
--- a/prism.js
+++ b/prism.js
@@ -431,8 +431,8 @@ var _ = {
 				if (o.hasOwnProperty(i)) {
 					callback.call(o, i, o[i], type || i);
 
-					var property = o[i],
-					    propertyType = _.util.type(property);
+					var property = o[i];
+					var propertyType = _.util.type(property);
 
 					if (propertyType === 'Object' && !visited[objId(property)]) {
 						visited[objId(property)] = true;
@@ -977,6 +977,7 @@ function matchGrammar(text, tokenList, grammar, startNode, startPos, rematch) {
 					}
 				}
 
+				// eslint-disable-next-line no-redeclare
 				var from = match.index,
 					matchStr = match[0],
 					before = str.slice(0, from),
diff --git a/tests/helper/prism-loader.js b/tests/helper/prism-loader.js
index 30f1729ad5..5c34048934 100644
--- a/tests/helper/prism-loader.js
+++ b/tests/helper/prism-loader.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const fs = require("fs");
-const { getAllFiles } = require("./test-discovery");
 const components = require("../../components.json");
 const getLoader = require("../../dependencies");
 const languagesCatalog = components.languages;
diff --git a/tests/pattern-tests.js b/tests/pattern-tests.js
index 6d66273310..5dbdaa2610 100644
--- a/tests/pattern-tests.js
+++ b/tests/pattern-tests.js
@@ -199,7 +199,7 @@ function testPatterns(Prism) {
 	function isFirstMatch(element) {
 		const parent = element.parent;
 		switch (parent.type) {
-			case 'Alternative':
+			case 'Alternative': {
 				// all elements before this element have to of zero length
 				if (!parent.elements.slice(0, parent.elements.indexOf(element)).every(isAlwaysZeroWidth)) {
 					return false;
@@ -210,6 +210,7 @@ function testPatterns(Prism) {
 				} else {
 					return isFirstMatch(grandParent);
 				}
+			}
 
 			case 'Quantifier':
 				if (parent.max >= 2) {
diff --git a/tests/plugins/keep-markup/test.js b/tests/plugins/keep-markup/test.js
index bb0e78b34b..d3f168e1ab 100644
--- a/tests/plugins/keep-markup/test.js
+++ b/tests/plugins/keep-markup/test.js
@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 const expect = require('chai').expect;
 const jsdom = require('jsdom')
 const { JSDOM } = jsdom