What is type-fest?
The type-fest package provides a collection of essential TypeScript types for use in a wide range of applications. It includes utility types, primitive types, and complex object types to enhance TypeScript's static typing capabilities.
What are type-fest's main functionalities?
Primitive types
Includes types like LiteralUnion, Primitive, and Promisable, which help with defining literals, primitive values, and promise-like structures.
{"isPrimitive": true}
Basic utilities
Provides utility types such as Except, Mutable, ReadonlyDeep, and many others that help manipulate and transform types in various ways.
{"isEmptyArray": array.length === 0}
Object types
Contains types for working with objects, such as Merge and RequireAtLeastOne, which assist in merging types and ensuring at least one property is present, respectively.
{"isObjectClean": Object.keys(object).length === 0 && object.constructor === Object}
Conditional types
Includes conditional types like ConditionalExcept and ConditionalKeys, which apply conditions to filter keys or properties of types.
{"isTruthy": T extends false | '' | 0 | null | undefined ? false : true}
Other packages similar to type-fest
utility-types
The utility-types package provides a collection of utility types for TypeScript, similar to type-fest. It includes types for operations like picking, omitting, and readonly transformations. It is comparable to type-fest but may have a different set of utilities and slightly different implementations.
ts-essentials
ts-essentials offers a wide range of TypeScript types, including deep readonly and writable types, as well as utility types for better type inference. It is similar to type-fest in its goal to enhance TypeScript's type system but may differ in the specific types offered and its API design.
typesafe-actions
While typesafe-actions is more focused on Redux action creators, it also provides utility types for better type safety in Redux. It is similar to type-fest in that it enhances TypeScript's type system but is more specialized for Redux-related typing.