import stylistic, { RuleOptions } from "@stylistic/eslint-plugin"; import { Linter } from "eslint"; import { ESLintRules as IESLintRules } from "eslint/rules"; import simpleImportSort from "eslint-plugin-simple-import-sort"; import unusedImports from "eslint-plugin-unused-imports"; import TSEslint from "typescript-eslint"; // cursed type ExtractRules = { [K in keyof Rules as K extends string ? `@typescript-eslint/${K}` : never]: Rules[K] extends { defaultOptions: infer Options extends any[]; } ? Linter.RuleEntry : never; }; type _RuleOptions = { [K in keyof RuleOptions]: Linter.RuleEntry; }; type _statmentType = RuleOptions["@stylistic/padding-line-between-statements"][number]["next" | "prev"]; type PaddingSchema = { blankLine: "any" | "always" | "never"; prev: _statmentType | _statmentType[] | readonly _statmentType[]; next: _statmentType | _statmentType[] | readonly _statmentType[]; }[]; type ElementType = T extends (infer U)[] ? U : never; type PaddingElement = ElementType; const ESLintRules: IESLintRules = { "array-callback-return": [ "error", { allowImplicit: true, }, ], // done by tsserver "constructor-super": "off", "for-direction": "error", // done by tsserver "getter-return": "off", "no-async-promise-executor": "error", // done by tsserver "no-class-assign": "off", "no-compare-neg-zero": "error", "no-cond-assign": ["error", "except-parens"], // done by tsserver "no-const-assign": "off", "no-constant-binary-expression": "error", "no-constant-condition": [ "error", { // @ts-expect-error Why is this erroring checkLoops: "allExceptWhileTrue", }, ], "no-constructor-return": "error", "no-control-regex": "error", "no-debugger": "warn", // done by tsserver "no-dupe-args": "off", // done by tsserver "no-dupe-class-members": "off", "no-dupe-else-if": "error", // done by tsserver "no-dupe-keys": "off", "no-duplicate-case": "error", "no-duplicate-imports": "error", "no-empty-character-class": "error", "no-empty-pattern": "error", "no-ex-assign": "error", "no-fallthrough": [ "error", { allowEmptyCase: true, reportUnusedFallthroughComment: true, }, ], // done by tsserver "no-func-assign": "off", // done by tsserver "no-import-assign": "off", // only for pre-es6 "no-inner-declarations": "off", // FIXME: allow for \i in patches "no-invalid-regexp": "error", "no-irregular-whitespace": "error", "no-loss-of-precision": "error", "no-misleading-character-class": "error", // done by tsserver "no-new-native-nonconstructor": "off", // done by tsserver "no-obj-calls": "off", "no-prototype-builtins": "error", "no-self-assign": "error", "no-self-compare": "error", // done by tsserver "no-setter-return": "off", "no-sparse-arrays": "error", "no-template-curly-in-string": "error", // done by tsserver "no-this-before-super": "off", // done by tsserver "no-undef": "off", "no-unexpected-multiline": "error", "no-unmodified-loop-condition": "error", // done by tsserver "no-unreachable": "off", "no-unreachable-loop": "error", "no-unsafe-finally": "error", // done by tsserver "no-unsafe-negation": "off", "no-unsafe-optional-chaining": "error", "no-unused-private-class-members": "error", // done by no-unused-imports "no-unused-vars": "off", "no-useless-assignment": "error", "no-useless-backreference": "error", "require-atomic-updates": "off", "use-isnan": [ "error", { enforceForIndexOf: true, enforceForSwitchCase: true, }, ], "valid-typeof": "error", // suggestions "accessor-pairs": [ "error", { enforceForClassMembers: true, }, ], "block-scoped-var": "error", "default-case": "error", "default-case-last": "error", "dot-notation": "error", eqeqeq: ["error", "always", { null: "ignore" }], "grouped-accessor-pairs": ["error", "getBeforeSet"], "logical-assignment-operators": [ "error", "always", { enforceForIfStatements: true, }, ], "no-caller": "error", "no-case-declarations": "error", "no-delete-var": "error", "no-else-return": "error", "no-empty": "error", "no-empty-static-block": "error", "no-extend-native": "error", "no-extra-bind": "error", "no-extra-boolean-cast": "error", "no-extra-label": "error", "no-global-assign": "error", "no-implied-eval": "error", "no-label-var": "error", "no-lonely-if": "error", "no-multi-str": "error", "no-nonoctal-decimal-escape": "error", "no-octal": "error", "no-octal-escape": "error", "no-redeclare": "error", "no-regex-spaces": "error", "no-return-assign": ["error", "except-parens"], "no-sequences": "error", "no-shadow-restricted-names": "error", "no-throw-literal": "error", "no-unneeded-ternary": "error", "no-unused-labels": "error", "no-useless-call": "error", "no-useless-catch": "error", "no-useless-computed-key": "error", "no-useless-concat": "error", "no-useless-escape": "error", "no-useless-rename": "error", "no-with": "error", "object-shorthand": "error", "operator-assignment": ["error", "always"], "prefer-const": [ "error", { destructuring: "all", }, ], "prefer-exponentiation-operator": "error", "prefer-numeric-literals": "error", "prefer-object-has-own": "error", "prefer-object-spread": "error", "prefer-promise-reject-errors": "error", "prefer-regex-literals": [ "error", { disallowRedundantWrapping: true, }, ], "prefer-rest-params": "error", "prefer-spread": "error", "prefer-template": "error", "require-yield": "error", yoda: ["error", "never"], }; const TSLintRules: Partial = { "@typescript-eslint/no-use-before-define": [ "error", { ignoreTypeReferences: true, functions: false, }, ], "@typescript-eslint/require-await": "error", "@typescript-eslint/default-param-last": "error", "@typescript-eslint/prefer-destructuring": [ "error", { VariableDeclarator: { object: true, array: true, }, AssignmentExpression: { object: false, array: false, }, }, { enforceForRenamedProperties: false, }, ], }; const styleRules: Partial<_RuleOptions> = { "@stylistic/array-bracket-newline": [ "error", { multiline: true, }, ], "@stylistic/array-bracket-spacing": ["error", "never"], "@stylistic/array-element-newline": [ "error", { consistent: true, multiline: true, }, ], "@stylistic/arrow-parens": ["error", "always"], "@stylistic/arrow-spacing": [ "error", { before: true, after: true, }, ], "@stylistic/block-spacing": ["error", "always"], "@stylistic/brace-style": ["error", "1tbs"], "@stylistic/comma-dangle": ["error", "always-multiline"], "@stylistic/comma-spacing": ["error"], "@stylistic/comma-style": ["error", "last"], "@stylistic/computed-property-spacing": ["error", "never"], "@stylistic/curly-newline": [ "error", { consistent: true, }, ], "@stylistic/dot-location": ["error", "property"], "@stylistic/eol-last": ["error", "always"], "@stylistic/function-call-spacing": ["error", "never"], "@stylistic/function-call-argument-newline": ["error", "consistent"], "@stylistic/function-paren-newline": ["error", "multiline"], "@stylistic/generator-star-spacing": [ "error", { before: true, after: false, }, ], "@stylistic/implicit-arrow-linebreak": ["error", "beside"], "@stylistic/indent": [ "error", 4, { // ton of overrides available SwitchCase: 1, }, ], "@stylistic/indent-binary-ops": ["error", 2], "@stylistic/key-spacing": [ "error", { beforeColon: false, afterColon: true, mode: "strict", }, ], "@stylistic/keyword-spacing": [ "error", { before: true, after: true, }, ], "@stylistic/line-comment-position": ["off"], // done by git autocrlf "@stylistic/linebreak-style": ["off"], "@stylistic/lines-around-comment": ["off"], "@stylistic/lines-between-class-members": [ "error", { enforce: [ { blankLine: "always", prev: "*", next: "*", }, { blankLine: "always", prev: "*", next: "method", }, { blankLine: "always", prev: "method", next: "*", }, { blankLine: "always", prev: "field", next: "*", }, { blankLine: "always", prev: "*", next: "field", }, { blankLine: "never", prev: "field", next: "field", }, ], }, { exceptAfterOverload: true, }, ], "@stylistic/max-len": [ "error", { code: 120, ignoreComments: true, ignoreUrls: true, ignoreStrings: true, ignoreTemplateLiterals: true, ignoreRegExpLiterals: true, }, ], "@stylistic/max-statements-per-line": ["off"], "@stylistic/member-delimiter-style": [ "error", { multiline: { delimiter: "semi", requireLast: true, }, singleline: { delimiter: "semi", requireLast: true, }, multilineDetection: "brackets", }, ], // messes with editor comment hotkeys "@stylistic/multiline-comment-style": ["off"], "@stylistic/multiline-ternary": ["error", "always-multiline"], "@stylistic/new-parens": ["error", "always"], "@stylistic/newline-per-chained-call": [ "error", { ignoreChainWithDepth: 1, }, ], "@stylistic/no-confusing-arrow": [ "error", { allowParens: true, }, ], "@stylistic/no-extra-parens": [ "error", "all", { // things like (foo && bar) || baz || qux nestedBinaryExpressions: false, enforceForArrowConditionals: false, returnAssign: false, conditionalAssign: false, }, ], "@stylistic/no-extra-semi": ["error"], "@stylistic/no-floating-decimal": ["error"], "@stylistic/no-mixed-operators": ["error"], "@stylistic/no-mixed-spaces-and-tabs": ["error"], "@stylistic/no-multi-spaces": ["error"], "@stylistic/no-multiple-empty-lines": [ "error", { max: 2, maxBOF: 0, maxEOF: 1, }, ], "@stylistic/no-tabs": ["error"], "@stylistic/no-trailing-spaces": [ "error", { // jsdoc 2 spaces for a linebreak ignoreComments: true, }, ], "@stylistic/no-whitespace-before-property": ["error"], "@stylistic/nonblock-statement-body-position": ["error", "below"], "@stylistic/object-curly-newline": [ "error", { // destructring assingment ObjectPattern: { multiline: true, consistent: true, }, ObjectExpression: { consistent: true, multiline: true, minProperties: 4, }, ImportDeclaration: { multiline: true, }, ExportDeclaration: "always", }, ], "@stylistic/object-curly-spacing": ["error", "always"], "@stylistic/object-property-newline": [ "error", { // FIXME: no way to limit total number of props before a linebreak is needed other than one allowAllPropertiesOnSameLine: false, }, ], "@stylistic/one-var-declaration-per-line": ["error", "initializations"], "@stylistic/operator-linebreak": ["error", "before"], "@stylistic/padded-blocks": ["error", "never"], "@stylistic/padding-line-between-statements": [ "error", ...((function (): PaddingSchema { const tsTypes = ["enum", "interface", "type"] as const; const varTypes = ["var", "let", "const"] as const; const singlelineVar = varTypes.map((x) => `singleline-${x}` as const); const multilineVar = varTypes.map((x) => `multiline-${x}` as const); function makeVariableDecPadding(): PaddingSchema { return [ // add a line before and after variable blocks of variables withInverse({ blankLine: "always", prev: "*", next: varTypes, }), // no lines within groups of single line variable declarations { blankLine: "never", prev: singlelineVar, next: singlelineVar, } as const, // multiline variable declarations will always be padded with newlines withInverse({ blankLine: "always", prev: multilineVar, next: "*", }), ].flat(99); } function makeFunctionPadding(): PaddingSchema { return [ // overloads { blankLine: "always", prev: "*", next: "function-overload", }, { blankLine: "never", prev: "function-overload", next: ["function-overload", "function"], }, ]; } function makeTypescriptPadding(): PaddingSchema { return withInverse({ blankLine: "always", prev: "*", next: tsTypes, }); } // util function withInverse(rule: PaddingElement): [PaddingElement, PaddingElement] { const { prev, next } = rule; return [ rule, { blankLine: rule.blankLine, prev: next, next: prev, }, ]; } return [ makeVariableDecPadding(), makeFunctionPadding(), makeTypescriptPadding(), ].flat(99); })() .flat() as any /* doesnt include readonly arrays for some reason */), ], "@stylistic/quote-props": ["error", "as-needed"], "@stylistic/quotes": [ "error", "double", { avoidEscape: true, allowTemplateLiterals: "avoidEscape", }, ], "@stylistic/rest-spread-spacing": ["error", "never"], "@stylistic/semi": ["error", "always"], "@stylistic/semi-spacing": ["error"], "@stylistic/semi-style": ["error", "last"], "@stylistic/space-before-blocks": ["error", "always"], "@stylistic/space-before-function-paren": [ "error", { anonymous: "always", named: "never", asyncArrow: "always", }, ], "@stylistic/space-in-parens": ["error", "never"], "@stylistic/space-infix-ops": ["error"], "@stylistic/space-unary-ops": ["error"], "@stylistic/spaced-comment": ["error", "always"], "@stylistic/switch-colon-spacing": ["error"], "@stylistic/template-curly-spacing": ["error", "never"], "@stylistic/template-tag-spacing": ["error"], "@stylistic/type-annotation-spacing": [ "error", { after: true, before: false, overrides: { arrow: { after: true, before: true, }, }, }, ], "@stylistic/type-generic-spacing": ["error"], "@stylistic/type-named-tuple-spacing": ["error"], "@stylistic/wrap-regex": ["off"], "@stylistic/yield-star-spacing": ["error"], }; const extensions = "{js,mjs,cjs,jsx,mjsx,cjsx,ts,mts,cts,tsx,mtsx,ctsx}"; export default TSEslint.config({ ignores: ["dist", "src/webview"] }, { files: [`src/**/*.${extensions}`, `eslint.config.${extensions}`], plugins: { "@stylistic": stylistic, "@typescript-eslint": TSEslint.plugin, "simple-import-sort": simpleImportSort, "unused-imports": unusedImports, }, languageOptions: { parser: TSEslint.parser, parserOptions: { projectService: true, tsconfigRootDir: import.meta.dirname, }, }, rules: { ...ESLintRules, ...TSLintRules, // Style Rules ...styleRules, "unused-imports/no-unused-imports": "error", "unused-imports/no-unused-vars": [ "warn", { vars: "all", varsIgnorePattern: "^_", args: "after-used", argsIgnorePattern: "^_", }, ], // Plugin Rules "simple-import-sort/imports": [ "error", { groups: [ ["^@.+$"], ["^\\./(?=.*/)(?!/?$)", "^\\.(?!/?$)", "^\\./?$", "^\\.\\.(?!/?$)", "^\\.\\./?$"], ["^(assert|buffer|child_process|cluster|console|constants|crypto|dgram|dns|domain|events|fs|http|https|module|net|os|path|punycode|querystring|readline|repl|stream|string_decoder|sys|timers|tls|tty|url|util|vm|zlib|freelist|v8|process|async_hooks|http2|perf_hooks)(/.*|$)"], ], }, ], "simple-import-sort/exports": "error", }, });