Type Alias PickByPrefix<TMapping, TPrefix, TKeys>

PickByPrefix: {
    [TKey in keyof TMapping as TKey extends | `${TPrefix}${infer _TSuffix}`
    | TKeys
        ? TKey
        : never]: TMapping[TKey]
}

Produces a subset of a mapping type, where the keys either match some prefix string, or are in a list of exact matches.

type T = PickByPrefix<{foo_1: number, foo_2: number, nope: string, included: string, also: number}, 'foo_', 'included' | 'also'>.

T = {foo_1: number, foo_2: number, included: string, also: number}

Type Parameters

  • TMapping
  • TPrefix extends string
  • TKeys extends keyof TMapping = never

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