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<div align="center"> <br> <br> <img src="media/logo.svg" alt="type-fest" height="300"> <br> <br> <b>A collection of essential TypeScript types</b> <br> <br> <br> <br> <hr> <div align="center"> <p> <p> ^{<a href="https://github.com/sponsors/sindresorhus">Sindre Sorhus' open source work is supported by the community</a>} </p> ^{Special thanks to:} <br> <br> <a href="https://standardresume.co/tech"> <img src="https://sindresorhus.com/assets/thanks/standard-resume-logo.svg" width="180"/> </a> <br> <br> <br> <a href="https://workos.com/?utm_campaign=github_repo&utm_medium=referral&utm_content=type-fest&utm_source=github"> <div> <img src="https://sindresorhus.com/assets/thanks/workos-logo-white-bg.svg" width="220" alt="WorkOS"> </div> <b>Your app, enterprise-ready.</b> <div> _{Start selling to enterprise customers with just a few lines of code.} <br> ^{Add Single Sign-On (and more) in minutes instead of months.} </div> </a> <br> <br> <br> <a href="https://transloadit.com?utm_source=sindresorhus&utm_medium=referral&utm_campaign=sponsorship&utm_content=type-fest"> <picture> <source width="350" media="(prefers-color-scheme: dark)" srcset="https://sindresorhus.com/assets/thanks/transloadit-logo-dark.svg"> <source width="350" media="(prefers-color-scheme: light)" srcset="https://sindresorhus.com/assets/thanks/transloadit-logo.svg"> <img width="350" src="https://sindresorhus.com/assets/thanks/transloadit-logo.svg" alt="Transloadit logo"> </picture> </a> <br> <br> </p> </div> <br> <hr> </div> <br> <br> [](https://giphy.com/gifs/illustration-rainbow-unicorn-26AHG5KGFxSkUWw1i) [](https://www.npmjs.com/package/type-fest?activeTab=dependents) [](https://www.npmjs.com/package/type-fest) Many of the types here should have been built-in. You can help by suggesting some of them to the [TypeScript project](https://github.com/Microsoft/TypeScript/blob/main/CONTRIBUTING.md). Either add this package as a dependency or copy-paste the needed types. No credit required. ���� PR welcome for additional commonly needed types and docs improvements. Read the [contributing guidelines](.github/contributing.md) first. **Help wanted with reviewing [proposals](https://github.com/sindresorhus/type-fest/issues) and [pull requests](https://github.com/sindresorhus/type-fest/pulls).** ## Install ```sh npm install type-fest ``` *Requires TypeScript >=5.1* *Works best with [`{strict: true}`](https://www.typescriptlang.org/tsconfig#strict) in your tsconfig.* ## Usage ```ts import type {Except} from 'type-fest'; type Foo = { unicorn: string; rainbow: boolean; }; type FooWithoutRainbow = Except<Foo, 'rainbow'>; //=> {unicorn: string} ``` ## API Click the type names for complete docs. ### Basic - [`Primitive`](source/primitive.d.ts) - Matches any [primitive value](https://developer.mozilla.org/en-US/docs/Glossary/Primitive). - [`Class`](source/basic.d.ts) - Matches a [`class`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes). - [`Constructor`](source/basic.d.ts) - Matches a [`class` constructor](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes). - [`AbstractClass`](source/basic.d.ts) - Matches an [`abstract class`](https://www.typescriptlang.org/docs/handbook/classes.html#abstract-classes). - [`AbstractConstructor`](source/basic.d.ts) - Matches an [`abstract class`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-2.html#abstract-construct-signatures) constructor. - [`TypedArray`](source/typed-array.d.ts) - Matches any [typed array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray), like `Uint8Array` or `Float64Array`. - [`ObservableLike`](source/observable-like.d.ts) - Matches a value that is like an [Observable](https://github.com/tc39/proposal-observable). ### Utilities - [`EmptyObject`](source/empty-object.d.ts) - Represents a strictly empty plain object, the `{}` value. - [`IsEmptyObject`](source/empty-object.d.ts) - Returns a `boolean` for whether the type is strictly equal to an empty plain object, the `{}` value. - [`NonEmptyObject`](source/non-empty-object.d.ts) - Represents an object with at least 1 non-optional key. - [`UnknownRecord`](source/unknown-record.d.ts) - Represents an object with `unknown` value. You probably want this instead of `{}`. - [`Except`](source/except.d.ts) - Create a type from an object type without certain keys. This is a stricter version of [`Omit`](https://www.typescriptlang.org/docs/handbook/utility-types.html#omittype-keys). - [`Writable`](source/writable.d.ts) - Create a type that strips `readonly` from all or some of an object's keys. The inverse of `Readonly<T>`. - [`WritableDeep`](source/writable-deep.d.ts) - Create a deeply mutable version of an `object`/`ReadonlyMap`/`ReadonlySet`/`ReadonlyArray` type. The inverse of `ReadonlyDeep<T>`. Use `Writable<T>` if you only need one level deep. - [`Merge`](source/merge.d.ts) - Merge two types into a new type. Keys of the second type overrides keys of the first type. - [`MergeDeep`](source/merge-deep.d.ts) - Merge two objects or two arrays/tuples recursively into a new type. - [`MergeExclusive`](source/merge-exclusive.d.ts) - Create a type that has mutually exclusive keys. - [`OverrideProperties`](source/override-properties.d.ts) - Override only existing properties of the given type. Similar to `Merge`, but enforces that the original type has the properties you want to override. - [`RequireAtLeastOne`](source/require-at-least-one.d.ts) - Create a type that requires at least one of the given keys. - [`RequireExactlyOne`](source/require-exactly-one.d.ts) - Create a type that requires exactly a single key of the given keys and disallows more. - [`RequireAllOrNone`](source/require-all-or-none.d.ts) - Create a type that requires all of the given keys or none of the given keys. - [`RequireOneOrNone`](source/require-one-or-none.d.ts) - Create a type that requires exactly a single key of the given keys and disallows more, or none of the given keys. - [`RequiredDeep`](source/required-deep.d.ts) - Create a deeply required version of another type. Use [`Required<T>`](https://www.typescriptlang.org/docs/handbook/utility-types.html#requiredtype) if you only need one level deep. - [`OmitIndexSignature`](source/omit-index-signature.d.ts) - Omit any index signatures from the given object type, leaving only explicitly defined properties. - [`PickIndexSignature`](source/pick-index-signature.d.ts) - Pick only index signatures from the given object type, leaving out all explicitly defined properties. - [`PartialDeep`](source/partial-deep.d.ts) - Create a deeply optional version of another type. Use [`Partial<T>`](https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype) if you only need one level deep. - [`PartialOnUndefinedDeep`](source/partial-on-undefined-deep.d.ts) - Create a deep version of another type where all keys accepting `undefined` type are set to optional. - [`UndefinedOnPartialDeep`](source/undefined-on-partial-deep.d.ts) - Create a deep version of another type where all optional keys are set to also accept `undefined`. - [`ReadonlyDeep`](source/readonly-deep.d.ts) - Create a deeply immutable version of an `object`/`Map`/`Set`/`Array` type. Use [`Readonly<T>`](https://www.typescriptlang.org/docs/handbook/utility-types.html#readonlytype) if you only need one level deep. - [`LiteralUnion`](source/literal-union.d.ts) - Create a union type by combining primitive types and literal types without sacrificing auto-completion in IDEs for the literal type part of the union. Workaround for [Microsoft/TypeScript#29729