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README.md
1<h1 align="center">ESLint Plugin TypeScript</h1> 2 3<p align="center">An ESLint plugin which provides lint rules for TypeScript codebases.</p> 4 5<p align="center"> 6 <img src="https://github.com/typescript-eslint/typescript-eslint/workflows/CI/badge.svg" alt="CI" /> 7 <a href="https://www.npmjs.com/package/@typescript-eslint/eslint-plugin"><img src="https://img.shields.io/npm/v/@typescript-eslint/eslint-plugin.svg?style=flat-square" alt="NPM Version" /></a> 8 <a href="https://www.npmjs.com/package/@typescript-eslint/eslint-plugin"><img src="https://img.shields.io/npm/dm/@typescript-eslint/eslint-plugin.svg?style=flat-square" alt="NPM Downloads" /></a> 9</p> 10 11## Getting Started 12 13- **[You can find our Getting Started docs here](../../docs/getting-started/linting/README.md)** 14- **[You can find our FAQ / Troubleshooting docs here](../../docs/getting-started/linting/FAQ.md)** 15 16These docs walk you through setting up ESLint, this plugin, and our parser. If you know what you're doing and just want to quick start, read on... 17 18## Quick-start 19 20### Installation 21 22Make sure you have TypeScript and [`@typescript-eslint/parser`](../parser) installed: 23 24```bash 25$ yarn add -D typescript @typescript-eslint/parser 26$ npm i --save-dev typescript @typescript-eslint/parser 27``` 28 29Then install the plugin: 30 31```bash 32$ yarn add -D @typescript-eslint/eslint-plugin 33$ npm i --save-dev @typescript-eslint/eslint-plugin 34``` 35 36It is important that you use the same version number for `@typescript-eslint/parser` and `@typescript-eslint/eslint-plugin`. 37 38**Note:** If you installed ESLint globally (using the `-g` flag) then you must also install `@typescript-eslint/eslint-plugin` globally. 39 40### Usage 41 42Add `@typescript-eslint/parser` to the `parser` field and `@typescript-eslint` to the plugins section of your `.eslintrc` configuration file, then configure the rules you want to use under the rules section. 43 44```json 45{ 46 "parser": "@typescript-eslint/parser", 47 "plugins": ["@typescript-eslint"], 48 "rules": { 49 "@typescript-eslint/rule-name": "error" 50 } 51} 52``` 53 54You can also enable all the recommended rules for our plugin. Add `plugin:@typescript-eslint/recommended` in extends: 55 56```json 57{ 58 "extends": ["plugin:@typescript-eslint/recommended"] 59} 60``` 61 62**Note: Make sure to use `eslint --ext .js,.ts` since by [default](https://eslint.org/docs/user-guide/command-line-interface#--ext) `eslint` will only search for `.js` files.** 63 64### Recommended Configs 65 66You can also use [`eslint:recommended`](https://eslint.org/docs/rules/) (the set of rules which are recommended for all projects by the ESLint Team) with this plugin: 67 68```json 69{ 70 "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"] 71} 72``` 73 74As of version 2 of this plugin, _by design_, none of the rules in the main `recommended` config require type-checking in order to run. This means that they are more lightweight and faster to run. 75 76Some highly valuable rules simply require type-checking in order to be implemented correctly, however, so we provide an additional config you can extend from called `recommended-requiring-type-checking`. You would apply this _in addition_ to the recommended configs previously mentioned, e.g.: 77 78```json 79{ 80 "extends": [ 81 "eslint:recommended", 82 "plugin:@typescript-eslint/recommended", 83 "plugin:@typescript-eslint/recommended-requiring-type-checking" 84 ] 85} 86``` 87 88Pro Tip: For larger codebases you may want to consider splitting our linting into two separate stages: 1. fast feedback rules which operate purely based on syntax (no type-checking), 2. rules which are based on semantics (type-checking). 89 90**[You can read more about linting with type information here](../../docs/getting-started/linting/TYPED_LINTING.md)** 91 92## Supported Rules 93 94<!-- begin base rule list --> 95 96**Key**: :heavy_check_mark: = recommended, :wrench: = fixable, :thought_balloon: = requires type information 97 98| Name | Description | :heavy_check_mark: | :wrench: | :thought_balloon: | 99| --------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- | ------------------ | -------- | ----------------- | 100| [`@typescript-eslint/adjacent-overload-signatures`](./docs/rules/adjacent-overload-signatures.md) | Require that member overloads be consecutive | :heavy_check_mark: | | | 101| [`@typescript-eslint/array-type`](./docs/rules/array-type.md) | Requires using either `T[]` or `Array<T>` for arrays | | :wrench: | | 102| [`@typescript-eslint/await-thenable`](./docs/rules/await-thenable.md) | Disallows awaiting a value that is not a Thenable | :heavy_check_mark: | | :thought_balloon: | 103| [`@typescript-eslint/ban-ts-comment`](./docs/rules/ban-ts-comment.md) | Bans `@ts-<directive>` comments from being used or requires descriptions after directive | :heavy_check_mark: | | | 104| [`@typescript-eslint/ban-tslint-comment`](./docs/rules/ban-tslint-comment.md) | Bans `// tslint:<rule-flag>` comments from being used | | :wrench: | | 105| [`@typescript-eslint/ban-types`](./docs/rules/ban-types.md) | Bans specific types from being used | :heavy_check_mark: | :wrench: | | 106| [`@typescript-eslint/class-literal-property-style`](./docs/rules/class-literal-property-style.md) | Ensures that literals on classes are exposed in a consistent style | | :wrench: | | 107| [`@typescript-eslint/consistent-indexed-object-style`](./docs/rules/consistent-indexed-object-style.md) | Enforce or disallow the use of the record type | | :wrench: | | 108| [`@typescript-eslint/consistent-type-assertions`](./docs/rules/consistent-type-assertions.md) | Enforces consistent usage of type assertions | | | | 109| [`@typescript-eslint/consistent-type-definitions`](./docs/rules/consistent-type-definitions.md) | Consistent with type definition either `interface` or `type` | | :wrench: | | 110| [`@typescript-eslint/consistent-type-imports`](./docs/rules/consistent-type-imports.md) | Enforces consistent usage of type imports | | :wrench: | | 111| [`@typescript-eslint/explicit-function-return-type`](./docs/rules/explicit-function-return-type.md) | Require explicit return types on functions and class methods | | | | 112| [`@typescript-eslint/explicit-member-accessibility`](./docs/rules/explicit-member-accessibility.md) | Require explicit accessibility modifiers on class properties and methods | | :wrench: | | 113| [`@typescript-eslint/explicit-module-boundary-types`](./docs/rules/explicit-module-boundary-types.md) | Require explicit return and argument types on exported functions' and classes' public class methods | :heavy_check_mark: | | | 114| [`@typescript-eslint/member-delimiter-style`](./docs/rules/member-delimiter-style.md) | Require a specific member delimiter style for interfaces and type literals | | :wrench: | | 115| [`@typescript-eslint/member-ordering`](./docs/rules/member-ordering.md) | Require a consistent member declaration order | | | | 116| [`@typescript-eslint/method-signature-style`](./docs/rules/method-signature-style.md) | Enforces using a particular method signature syntax. | | :wrench: | | 117| [`@typescript-eslint/naming-convention`](./docs/rules/naming-convention.md) | Enforces naming conventions for everything across a codebase | | | :thought_balloon: | 118| [`@typescript-eslint/no-base-to-string`](./docs/rules/no-base-to-string.md) | Requires that `.toString()` is only called on objects which provide useful information when stringified | | | :thought_balloon: | 119| [`@typescript-eslint/no-confusing-non-null-assertion`](./docs/rules/no-confusing-non-null-assertion.md) | Disallow non-null assertion in locations that may be confusing | | :wrench: | | 120| [`@typescript-eslint/no-confusing-void-expression`](./docs/rules/no-confusing-void-expression.md) | Requires expressions of type void to appear in statement position | | :wrench: | :thought_balloon: | 121| [`@typescript-eslint/no-dynamic-delete`](./docs/rules/no-dynamic-delete.md) | Disallow the delete operator with computed key expressions | | :wrench: | | 122| [`@typescript-eslint/no-empty-interface`](./docs/rules/no-empty-interface.md) | Disallow the declaration of empty interfaces | :heavy_check_mark: | :wrench: | | 123| [`@typescript-eslint/no-explicit-any`](./docs/rules/no-explicit-any.md) | Disallow usage of the `any` type | :heavy_check_mark: | :wrench: | | 124| [`@typescript-eslint/no-extra-non-null-assertion`](./docs/rules/no-extra-non-null-assertion.md) | Disallow extra non-null assertion | :heavy_check_mark: | :wrench: | | 125| [`@typescript-eslint/no-extraneous-class`](./docs/rules/no-extraneous-class.md) | Forbids the use of classes as namespaces | | | | 126| [`@typescript-eslint/no-floating-promises`](./docs/rules/no-floating-promises.md) | Requires Promise-like values to be handled appropriately | :heavy_check_mark: | | :thought_balloon: | 127| [`@typescript-eslint/no-for-in-array`](./docs/rules/no-for-in-array.md) | Disallow iterating over an array with a for-in loop | :heavy_check_mark: | | :thought_balloon: | 128| [`@typescript-eslint/no-implicit-any-catch`](./docs/rules/no-implicit-any-catch.md) | Disallow usage of the implicit `any` type in catch clauses | | :wrench: | | 129| [`@typescript-eslint/no-inferrable-types`](./docs/rules/no-inferrable-types.md) | Disallows explicit type declarations for variables or parameters initialized to a number, string, or boolean | :heavy_check_mark: | :wrench: | | 130| [`@typescript-eslint/no-invalid-void-type`](./docs/rules/no-invalid-void-type.md) | Disallows usage of `void` type outside of generic or return types | | | | 131| [`@typescript-eslint/no-misused-new`](./docs/rules/no-misused-new.md) | Enforce valid definition of `new` and `constructor` | :heavy_check_mark: | | | 132| [`@typescript-eslint/no-misused-promises`](./docs/rules/no-misused-promises.md) | Avoid using promises in places not designed to handle them | :heavy_check_mark: | | :thought_balloon: | 133| [`@typescript-eslint/no-namespace`](./docs/rules/no-namespace.md) | Disallow the use of custom TypeScript modules and namespaces | :heavy_check_mark: | | | 134| [`@typescript-eslint/no-non-null-asserted-optional-chain`](./docs/rules/no-non-null-asserted-optional-chain.md) | Disallows using a non-null assertion after an optional chain expression | :heavy_check_mark: | | | 135| [`@typescript-eslint/no-non-null-assertion`](./docs/rules/no-non-null-assertion.md) | Disallows non-null assertions using the `!` postfix operator | :heavy_check_mark: | | | 136| [`@typescript-eslint/no-parameter-properties`](./docs/rules/no-parameter-properties.md) | Disallow the use of parameter properties in class constructors | | | | 137| [`@typescript-eslint/no-require-imports`](./docs/rules/no-require-imports.md) | Disallows invocation of `require()` | | | | 138| [`@typescript-eslint/no-this-alias`](./docs/rules/no-this-alias.md) | Disallow aliasing `this` | :heavy_check_mark: | | | 139| [`@typescript-eslint/no-type-alias`](./docs/rules/no-type-alias.md) | Disallow the use of type aliases | | | | 140| [`@typescript-eslint/no-unnecessary-boolean-literal-compare`](./docs/rules/no-unnecessary-boolean-literal-compare.md) | Flags unnecessary equality comparisons against boolean literals | | :wrench: | :thought_balloon: | 141| [`@typescript-eslint/no-unnecessary-condition`](./docs/rules/no-unnecessary-condition.md) | Prevents conditionals where the type is always truthy or always falsy | | :wrench: | :thought_balloon: | 142| [`@typescript-eslint/no-unnecessary-qualifier`](./docs/rules/no-unnecessary-qualifier.md) | Warns when a namespace qualifier is unnecessary | | :wrench: | :thought_balloon: | 143| [`@typescript-eslint/no-unnecessary-type-arguments`](./docs/rules/no-unnecessary-type-arguments.md) | Enforces that type arguments will not be used if not required | | :wrench: | :thought_balloon: | 144| [`@typescript-eslint/no-unnecessary-type-assertion`](./docs/rules/no-unnecessary-type-assertion.md) | Warns if a type assertion does not change the type of an expression | :heavy_check_mark: | :wrench: | :thought_balloon: | 145| [`@typescript-eslint/no-unnecessary-type-constraint`](./docs/rules/no-unnecessary-type-constraint.md) | Disallows unnecessary constraints on generic types | | :wrench: | | 146| [`@typescript-eslint/no-unsafe-assignment`](./docs/rules/no-unsafe-assignment.md) | Disallows assigning any to variables and properties | :heavy_check_mark: | | :thought_balloon: | 147| [`@typescript-eslint/no-unsafe-call`](./docs/rules/no-unsafe-call.md) | Disallows calling an any type value | :heavy_check_mark: | | :thought_balloon: | 148| [`@typescript-eslint/no-unsafe-member-access`](./docs/rules/no-unsafe-member-access.md) | Disallows member access on any typed variables | :heavy_check_mark: | | :thought_balloon: | 149| [`@typescript-eslint/no-unsafe-return`](./docs/rules/no-unsafe-return.md) | Disallows returning any from a function | :heavy_check_mark: | | :thought_balloon: | 150| [`@typescript-eslint/no-var-requires`](./docs/rules/no-var-requires.md) | Disallows the use of require statements except in import statements | :heavy_check_mark: | | | 151| [`@typescript-eslint/prefer-as-const`](./docs/rules/prefer-as-const.md) | Prefer usage of `as const` over literal type | :heavy_check_mark: | :wrench: | | 152| [`@typescript-eslint/prefer-enum-initializers`](./docs/rules/prefer-enum-initializers.md) | Prefer initializing each enums member value | | | | 153| [`@typescript-eslint/prefer-for-of`](./docs/rules/prefer-for-of.md) | Prefer a ‘for-of’ loop over a standard ‘for’ loop if the index is only used to access the array being iterated | | | | 154| [`@typescript-eslint/prefer-function-type`](./docs/rules/prefer-function-type.md) | Use function types instead of interfaces with call signatures | | :wrench: | | 155| [`@typescript-eslint/prefer-includes`](./docs/rules/prefer-includes.md) | Enforce `includes` method over `indexOf` method | | :wrench: | :thought_balloon: | 156| [`@typescript-eslint/prefer-literal-enum-member`](./docs/rules/prefer-literal-enum-member.md) | Require that all enum members be literal values to prevent unintended enum member name shadow issues | | | | 157| [`@typescript-eslint/prefer-namespace-keyword`](./docs/rules/prefer-namespace-keyword.md) | Require the use of the `namespace` keyword instead of the `module` keyword to declare custom TypeScript modules | :heavy_check_mark: | :wrench: | | 158| [`@typescript-eslint/prefer-nullish-coalescing`](./docs/rules/prefer-nullish-coalescing.md) | Enforce the usage of the nullish coalescing operator instead of logical chaining | | | :thought_balloon: | 159| [`@typescript-eslint/prefer-optional-chain`](./docs/rules/prefer-optional-chain.md) | Prefer using concise optional chain expressions instead of chained logical ands | | | | 160| [`@typescript-eslint/prefer-readonly`](./docs/rules/prefer-readonly.md) | Requires that private members are marked as `readonly` if they're never modified outside of the constructor | | :wrench: | :thought_balloon: | 161| [`@typescript-eslint/prefer-readonly-parameter-types`](./docs/rules/prefer-readonly-parameter-types.md) | Requires that function parameters are typed as readonly to prevent accidental mutation of inputs | | | :thought_balloon: | 162| [`@typescript-eslint/prefer-reduce-type-parameter`](./docs/rules/prefer-reduce-type-parameter.md) | Prefer using type parameter when calling `Array#reduce` instead of casting | | :wrench: | :thought_balloon: | 163| [`@typescript-eslint/prefer-regexp-exec`](./docs/rules/prefer-regexp-exec.md) | Enforce that `RegExp#exec` is used instead of `String#match` if no global flag is provided | :heavy_check_mark: | | :thought_balloon: | 164| [`@typescript-eslint/prefer-string-starts-ends-with`](./docs/rules/prefer-string-starts-ends-with.md) | Enforce the use of `String#startsWith` and `String#endsWith` instead of other equivalent methods of checking substrings | | :wrench: | :thought_balloon: | 165| [`@typescript-eslint/prefer-ts-expect-error`](./docs/rules/prefer-ts-expect-error.md) | Recommends using `@ts-expect-error` over `@ts-ignore` | | :wrench: | | 166| [`@typescript-eslint/promise-function-async`](./docs/rules/promise-function-async.md) | Requires any function or method that returns a Promise to be marked async | | | :thought_balloon: | 167| [`@typescript-eslint/require-array-sort-compare`](./docs/rules/require-array-sort-compare.md) | Requires `Array#sort` calls to always provide a `compareFunction` | | | :thought_balloon: | 168| [`@typescript-eslint/restrict-plus-operands`](./docs/rules/restrict-plus-operands.md) | When adding two variables, operands must both be of type number or of type string | :heavy_check_mark: | | :thought_balloon: | 169| [`@typescript-eslint/restrict-template-expressions`](./docs/rules/restrict-template-expressions.md) | Enforce template literal expressions to be of string type | :heavy_check_mark: | | :thought_balloon: | 170| [`@typescript-eslint/strict-boolean-expressions`](./docs/rules/strict-boolean-expressions.md) | Restricts the types allowed in boolean expressions | | | :thought_balloon: | 171| [`@typescript-eslint/switch-exhaustiveness-check`](./docs/rules/switch-exhaustiveness-check.md) | Exhaustiveness checking in switch with union type | | | :thought_balloon: | 172| [`@typescript-eslint/triple-slash-reference`](./docs/rules/triple-slash-reference.md) | Sets preference level for triple slash directives versus ES6-style import declarations | :heavy_check_mark: | | | 173| [`@typescript-eslint/type-annotation-spacing`](./docs/rules/type-annotation-spacing.md) | Require consistent spacing around type annotations | | :wrench: | | 174| [`@typescript-eslint/typedef`](./docs/rules/typedef.md) | Requires type annotations to exist | | | | 175| [`@typescript-eslint/unbound-method`](./docs/rules/unbound-method.md) | Enforces unbound methods are called with their expected scope | :heavy_check_mark: | | :thought_balloon: | 176| [`@typescript-eslint/unified-signatures`](./docs/rules/unified-signatures.md) | Warns for any two overloads that could be unified into one by using a union or an optional/rest parameter | | | | 177 178<!-- end base rule list --> 179 180### Extension Rules 181 182In some cases, ESLint provides a rule itself, but it doesn't support TypeScript syntax; either it crashes, or it ignores the syntax, or it falsely reports against it. 183In these cases, we create what we call an extension rule; a rule within our plugin that has the same functionality, but also supports TypeScript. 184 185<!-- begin extension rule list --> 186 187**Key**: :heavy_check_mark: = recommended, :wrench: = fixable, :thought_balloon: = requires type information 188 189| Name | Description | :heavy_check_mark: | :wrench: | :thought_balloon: | 190| ----------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------ | ------------------ | -------- | ----------------- | 191| [`@typescript-eslint/brace-style`](./docs/rules/brace-style.md) | Enforce consistent brace style for blocks | | :wrench: | | 192| [`@typescript-eslint/comma-dangle`](./docs/rules/comma-dangle.md) | Require or disallow trailing comma | | :wrench: | | 193| [`@typescript-eslint/comma-spacing`](./docs/rules/comma-spacing.md) | Enforces consistent spacing before and after commas | | :wrench: | | 194| [`@typescript-eslint/default-param-last`](./docs/rules/default-param-last.md) | Enforce default parameters to be last | | | | 195| [`@typescript-eslint/dot-notation`](./docs/rules/dot-notation.md) | enforce dot notation whenever possible | | :wrench: | :thought_balloon: | 196| [`@typescript-eslint/func-call-spacing`](./docs/rules/func-call-spacing.md) | Require or disallow spacing between function identifiers and their invocations | | :wrench: | | 197| [`@typescript-eslint/indent`](./docs/rules/indent.md) | Enforce consistent indentation | | :wrench: | | 198| [`@typescript-eslint/init-declarations`](./docs/rules/init-declarations.md) | require or disallow initialization in variable declarations | | | | 199| [`@typescript-eslint/keyword-spacing`](./docs/rules/keyword-spacing.md) | Enforce consistent spacing before and after keywords | | :wrench: | | 200| [`@typescript-eslint/lines-between-class-members`](./docs/rules/lines-between-class-members.md) | Require or disallow an empty line between class members | | :wrench: | | 201| [`@typescript-eslint/no-array-constructor`](./docs/rules/no-array-constructor.md) | Disallow generic `Array` constructors | :heavy_check_mark: | :wrench: | | 202| [`@typescript-eslint/no-dupe-class-members`](./docs/rules/no-dupe-class-members.md) | Disallow duplicate class members | | | | 203| [`@typescript-eslint/no-duplicate-imports`](./docs/rules/no-duplicate-imports.md) | Disallow duplicate imports | | | | 204| [`@typescript-eslint/no-empty-function`](./docs/rules/no-empty-function.md) | Disallow empty functions | :heavy_check_mark: | | | 205| [`@typescript-eslint/no-extra-parens`](./docs/rules/no-extra-parens.md) | Disallow unnecessary parentheses | | :wrench: | | 206| [`@typescript-eslint/no-extra-semi`](./docs/rules/no-extra-semi.md) | Disallow unnecessary semicolons | :heavy_check_mark: | :wrench: | | 207| [`@typescript-eslint/no-implied-eval`](./docs/rules/no-implied-eval.md) | Disallow the use of `eval()`-like methods | :heavy_check_mark: | | :thought_balloon: | 208| [`@typescript-eslint/no-invalid-this`](./docs/rules/no-invalid-this.md) | Disallow `this` keywords outside of classes or class-like objects | | | | 209| [`@typescript-eslint/no-loop-func`](./docs/rules/no-loop-func.md) | Disallow function declarations that contain unsafe references inside loop statements | | | | 210| [`@typescript-eslint/no-loss-of-precision`](./docs/rules/no-loss-of-precision.md) | Disallow literal numbers that lose precision | | | | 211| [`@typescript-eslint/no-magic-numbers`](./docs/rules/no-magic-numbers.md) | Disallow magic numbers | | | | 212| [`@typescript-eslint/no-redeclare`](./docs/rules/no-redeclare.md) | Disallow variable redeclaration | | | | 213| [`@typescript-eslint/no-shadow`](./docs/rules/no-shadow.md) | Disallow variable declarations from shadowing variables declared in the outer scope | | | | 214| [`@typescript-eslint/no-throw-literal`](./docs/rules/no-throw-literal.md) | Disallow throwing literals as exceptions | | | :thought_balloon: | 215| [`@typescript-eslint/no-unused-expressions`](./docs/rules/no-unused-expressions.md) | Disallow unused expressions | | | | 216| [`@typescript-eslint/no-unused-vars`](./docs/rules/no-unused-vars.md) | Disallow unused variables | :heavy_check_mark: | | | 217| [`@typescript-eslint/no-use-before-define`](./docs/rules/no-use-before-define.md) | Disallow the use of variables before they are defined | | | | 218| [`@typescript-eslint/no-useless-constructor`](./docs/rules/no-useless-constructor.md) | Disallow unnecessary constructors | | | | 219| [`@typescript-eslint/quotes`](./docs/rules/quotes.md) | Enforce the consistent use of either backticks, double, or single quotes | | :wrench: | | 220| [`@typescript-eslint/require-await`](./docs/rules/require-await.md) | Disallow async functions which have no `await` expression | :heavy_check_mark: | | :thought_balloon: | 221| [`@typescript-eslint/return-await`](./docs/rules/return-await.md) | Enforces consistent returning of awaited values | | :wrench: | :thought_balloon: | 222| [`@typescript-eslint/semi`](./docs/rules/semi.md) | Require or disallow semicolons instead of ASI | | :wrench: | | 223| [`@typescript-eslint/space-before-function-paren`](./docs/rules/space-before-function-paren.md) | Enforces consistent spacing before function parenthesis | | :wrench: | | 224| [`@typescript-eslint/space-infix-ops`](./docs/rules/space-infix-ops.md) | This rule is aimed at ensuring there are spaces around infix operators. | | :wrench: | | 225 226<!-- end extension rule list --> 227 228## Contributing 229 230[See the contributing guide here](../../CONTRIBUTING.md). 231
