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webshrine / stdtyp/src / PickByValue

Type Alias: PickByValue<T, ValueType> ​

PickByValue<T, ValueType>: Pick<T, { [Key in keyof T]-?: T[Key] extends ValueType ? Key : never }[keyof T]>

PickByValue

Type Parameters ​

• T

• ValueType

Desc ​

From T pick a set of properties by value matching ValueType. Credit: Piotr Lewandowski

Example ​

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

  // Expect: { req: number }
  type Props = PickByValue<Props, number>;
  // Expect: { req: number; reqUndef: number | undefined; }
  type Props = PickByValue<Props, number | undefined>;

Defined in ​

node_modules/.pnpm/utility-types@3.11.0/node_modules/utility-types/dist/mapped-types.d.ts:159