collectype

collectype v0.11.0

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collectype / types/utility / NumberKeys

Type Alias: NumberKeys<T>

NumberKeys<T> = { [K in keyof T]: T[K] extends number ? K : never }[keyof T]

Defined in: types/utility.ts:124

Returns the union of keys in T whose value type is number (including optional properties).

Type Parameters

T

T

The object type to inspect.

Example

type A = { foo: number; bar?: number; baz: string };
  type Keys = NumberKeys<A>; // "foo" | "bar"

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