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/** @type {import('eslint').Linter.Config} */
module.exports = {
	root: true,
	plugins: ['jsdoc', 'regexp'],
	extends: 'eslint:recommended',
	rules: {
		'no-use-before-define': ['error', { 'functions': false, 'classes': false }],

		// stylistic rules
		'brace-style': ['warn', '1tbs', { allowSingleLine: true }],
		'curly': ['warn', 'all'],
		'eol-last': 'warn',
		'no-multiple-empty-lines': ['warn', { max: 2, maxBOF: 0, maxEOF: 0 }],
		'no-tabs': ['warn', { allowIndentationTabs: true }],
		'no-var': 'error',
		'one-var': ['warn', 'never'],
		'quotes': ['warn', 'single', { avoidEscape: true, allowTemplateLiterals: true }],
		'semi': 'warn',
		'wrap-iife': 'warn',

		// spaces and indentation
		'arrow-spacing': 'warn',
		'block-spacing': 'warn',
		'comma-spacing': 'warn',
		'computed-property-spacing': 'warn',
		'func-call-spacing': 'warn',
		'generator-star-spacing': 'warn',
		'indent': ['warn', 'tab', { SwitchCase: 1 }],
		'key-spacing': 'warn',
		'keyword-spacing': 'warn',
		'no-multi-spaces': ['warn', { ignoreEOLComments: true }],
		'no-trailing-spaces': 'warn',
		'no-whitespace-before-property': 'warn',
		'object-curly-spacing': ['warn', 'always'],
		'rest-spread-spacing': 'warn',
		'semi-spacing': 'warn',
		'space-before-blocks': 'warn',
		'space-before-function-paren': ['warn', { named: 'never' }],
		'space-in-parens': 'warn',
		'space-infix-ops': ['warn', { int32Hint: true }],
		'space-unary-ops': 'warn',
		'switch-colon-spacing': 'warn',
		'template-curly-spacing': 'warn',
		'yield-star-spacing': 'warn',

		// JSDoc
		'jsdoc/check-alignment': 'warn',
		'jsdoc/check-syntax': 'warn',
		'jsdoc/check-param-names': 'warn',
		'jsdoc/require-hyphen-before-param-description': ['warn', 'never'],
		'jsdoc/check-tag-names': 'warn',
		'jsdoc/check-types': 'warn',
		'jsdoc/empty-tags': 'warn',
		'jsdoc/newline-after-description': 'warn',
		'jsdoc/require-param-name': 'warn',
		'jsdoc/require-property-name': 'warn',

		// regexp
		'regexp/no-dupe-disjunctions': 'error',
		'regexp/no-empty-alternative': 'error',
		'regexp/no-empty-capturing-group': 'error',
		'regexp/no-empty-lookarounds-assertion': 'error',
		'regexp/no-lazy-ends': 'error',
		'regexp/no-obscure-range': 'error',
		'regexp/no-optional-assertion': 'error',
		'regexp/no-standalone-backslash': 'error',
		'regexp/no-super-linear-backtracking': 'error',
		'regexp/no-unused-capturing-group': 'error',
		'regexp/no-zero-quantifier': 'error',
		'regexp/optimal-lookaround-quantifier': 'error',

		'regexp/match-any': 'warn',
		'regexp/negation': 'warn',
		'regexp/no-dupe-characters-character-class': 'warn',
		'regexp/no-trivially-nested-assertion': 'warn',
		'regexp/no-trivially-nested-quantifier': 'warn',
		'regexp/no-useless-character-class': 'warn',
		'regexp/no-useless-flag': 'warn',
		'regexp/no-useless-lazy': 'warn',
		'regexp/no-useless-range': 'warn',
		'regexp/prefer-d': ['warn', { insideCharacterClass: 'ignore' }],
		'regexp/prefer-plus-quantifier': 'warn',
		'regexp/prefer-question-quantifier': 'warn',
		'regexp/prefer-star-quantifier': 'warn',
		'regexp/prefer-w': 'warn',
		'regexp/sort-alternatives': 'warn',
		'regexp/sort-flags': 'warn',
		'regexp/strict': 'warn',

		// 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-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'
	},
	settings: {
		jsdoc: { mode: 'typescript' },
		regexp: {
			// allow alphanumeric and cyrillic ranges
			allowedCharacterRanges: ['alphanumeric', 'а-я', 'А-Я']
		}
	},
	ignorePatterns: [
		'*.min.js',
		'vendor/',
		'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,
				// Allow Set and Map. They are partially supported by IE11
				'Set': true,
				'Map': true
			},
			rules: {
				'no-var': 'off'
			}
		},
		{
			// `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
			},
			rules: {
				'no-var': 'off'
			}
		},
		{
			// 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
			},
			rules: {
				'no-var': 'off'
			}
		},
		{
			// Test files
			files: 'tests/**',
			env: {
				es6: true,
				mocha: true,
				node: true
			},
			parserOptions: {
				ecmaVersion: 2018
			}
		},
		{
			// Gulp, Danger, and benchmark
			files: [
				'gulpfile.js/**',
				'dangerfile.js',
				'benchmark/**',
			],
			env: {
				es6: true,
				node: true
			},
			parserOptions: {
				ecmaVersion: 2018
			}
		},
		{
			// This file
			files: '.eslintrc.js',
			env: {
				node: true
			}
		},
	]
};
kmx.io/prism.js/.eslintrc.js

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.eslintrc.js
