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docs: add dedicated TypeOrValueSpecifier docs page (typescript-eslint…
…#9875) * docs: add dedicated TypeOrValueSpecifier docs page * spelling * Unnecessary new test * path/package copypasta * push updated test snapshots
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--- | ||
id: type-or-value-specifier | ||
title: TypeOrValueSpecifier | ||
--- | ||
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Some lint rules include options to describe specific _types_ and/or _values_. | ||
These options use a standardized format exported from the `type-utils` package, **`TypeOrValueSpecifier`**. | ||
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`TypeOrValueSpecifier` allows three object forms of specifiers: | ||
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- [`FileSpecifier`](#filespecifier): for types or values declared in local files | ||
- [`LibSpecifier`](#libspecifier): for types or values declared in TypeScript's built-in lib definitions | ||
- [`PackageSpecifier`](#packagespecifier): for types or values imported from packages | ||
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For example, the following configuration of [`@typescript-eslint/no-floating-promises` > `allowForKnownSafeCalls`](/rules/no-floating-promises#allowforknownsafecalls) marks `node:test`'s `it` as safe using a package specifier: | ||
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```json | ||
{ | ||
"@typescript-eslint/no-floating-promises": [ | ||
"error", | ||
{ | ||
"allowForKnownSafeCalls": [ | ||
{ "from": "package", "name": "it", "package": "node:test" } | ||
] | ||
} | ||
] | ||
} | ||
``` | ||
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Each object format requires at least: | ||
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- `from`: which specifier to use, as `'file' | 'lib' | 'package'` | ||
- `name`: a `string` or `string[]` for type or value name(s) to match on | ||
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## FileSpecifier | ||
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```ts | ||
interface FileSpecifier { | ||
from: 'file'; | ||
name: string[] | string; | ||
path?: string; | ||
} | ||
``` | ||
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Describes specific types or values declared in local files. | ||
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`path` may be used to specify a file the types or values must be declared in. | ||
If omitted, all files will be matched. | ||
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### FileSpecifier Examples | ||
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Matching all types and values named `Props`: | ||
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```json | ||
{ "from": "file", "name": "Props" } | ||
``` | ||
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Matching all types and values named `Props` in `file.tsx`: | ||
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```json | ||
{ "from": "file", "name": "Props", "path": "file.tsx" } | ||
``` | ||
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## LibSpecifier | ||
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```ts | ||
interface LibSpecifier { | ||
from: 'lib'; | ||
name: string[] | string; | ||
} | ||
``` | ||
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Describes specific types or values declared in TypeScript's built-in `lib.*.d.ts` ("lib") types. | ||
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Lib types include `lib.dom.d.ts` globals such as `Window` and `lib.es*.ts` globals such as `Array`. | ||
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### LibSpecifier Examples | ||
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Matching all array-typed values: | ||
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```json | ||
{ "from": "lib", "name": "Array" } | ||
``` | ||
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Matching all `Promise` and `PromiseLike`-typed values: | ||
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```json | ||
{ "from": "lib", "name": ["Promise", "PromiseLike"] } | ||
``` | ||
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## PackageSpecifier | ||
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```ts | ||
interface PackageSpecifier { | ||
from: 'package'; | ||
name: string[] | string; | ||
package: string; | ||
} | ||
``` | ||
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Describes specific types or values imported from packages. | ||
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`package` must be used to specify the package name. | ||
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### PackageSpecifier Examples | ||
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Matching the `SafePromise` type from `@reduxjs/toolkit`: | ||
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```json | ||
{ "from": "package", "name": "SafePromise", "package": "@reduxjs/toolkit" } | ||
``` | ||
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Matching the `describe`, `it`, and `test` values from `vitest`: | ||
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```json | ||
{ "from": "package", "name": ["describe", "it", "test"], "package": "vitest" } | ||
``` | ||
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## Universal String Specifiers | ||
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`TypeOrValueSpecifier` also allows providing a plain string specifier to match all names regardless of declaration source. | ||
For example, providing `"RegExp"` matches _all_ types and values named `RegExp`. | ||
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:::danger | ||
We strongly recommend not using universal string specifiers. | ||
Matching _all_ names without specifying a source file, library, or package can accidentally match other types or values with a coincidentally similar name. | ||
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Universal string specifiers will be removed in a future major version of typescript-eslint. | ||
::: | ||
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## Rule Options Using This Format | ||
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- [`@typescript-eslint/no-floating-promises` > `allowForKnownSafeCalls`](/rules/no-floating-promises#allowforknownsafecalls) | ||
- [`@typescript-eslint/no-floating-promises` > `allowForKnownSafePromises`](/rules/no-floating-promises#allowforknownsafepromises) | ||
- [`@typescript-eslint/prefer-readonly-parameter-types` > `allow`](/rules/prefer-readonly-parameter-types/#allow) |
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