Why does Object.values return exact property types?

[iyegoroff]

lib Update Request

Configuration Check

My compilation target is esnext and my lib is es2017.

Missing / Incorrect Definition

Object.values returns exact property types instead of unknowns. This leads to errors in runtime.

Sample Code

type Foo = { x: string, y: string }
type Bar = { x: string, y: string; z: number }

// 'x' is considered a 'string' here
const processFoo = (foo: Foo) => Object.values(foo).map(x => x.endsWith('1'))

const bar: Bar = { x: '123', y: 'abc', z: 10 }

// throws "TypeError: x.endsWith is not a function. (In 'x.endsWith('1')', 'x.endsWith' is undefined)"
processFoo(bar)

playground link

Documentation Link

not related

[MartinJohns]

See #38520.

[iyegoroff]

Thanks for the quick reply!