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webshrine / stdtyp/src / OptionalKeys

Type Alias: OptionalKeys<T> ​

OptionalKeys<T>: { [K in keyof T]-?: {} extends Pick<T, K> ? K : never }[keyof T]

OptionalKeys

Type Parameters ​

• T

Desc ​

Get union type of keys that are optional in object type T

See ​

https://stackoverflow.com/questions/52984808/is-there-a-way-to-get-all-required-properties-of-a-typescript-object

Example ​

ts
type Props = { req: number; reqUndef: number | undefined; opt?: string; optUndef?: number | undefined; };

  // Expect: "opt" | "optUndef"
  type Keys = OptionalKeys<Props>;

Defined in ​

node_modules/.pnpm/utility-types@3.11.0/node_modules/utility-types/dist/mapped-types.d.ts:144