pick-ts v0.1.1

Pick-TS

A best-effort typesafe(er1) function to pick selected object fields.

import pick from "pick-ts"

const person = {
  name: "John",
  age: 20
}

type Named = {
  name: string
}

// These lines works
const n: Named = pick("name")(person)
const p: Person = pick("name", "age")(person)

// But this will fail at compilation time
const t = pick("title")(person)
const z: Named = pick("title")({ title: "Aloha" })

Limitations

1. As picked type is infered from pick argument value types - setting explicit keys type will break result type:

type Person = {
  name: string
  age: number
}

// This will compile, but doesn't work as expected!
const p: Person = pick<keyof Person>()({ name: "John", age: 20 })

Related Links

• https://github.com/Microsoft/TypeScript/issues/13298

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