OrderedKeysOf and OrderedValuesOf
(and OrderedEntriesOf?)
OrderedKeysOf<typeof x> would be the exact ordered type of Object.keys(x) and OrderedValuesOf<typeof x> the exact ordered type of Object.values(x).
const SYMBOL = Symbol("hi")
interface X {
a: number,
b: "cd",
c: boolean,
d: {x: number},
e: null,
[SYMBOL]: "f"
}
// Satisfies X but with reversed declaration order
const x = {
[SYMBOL]: "f",
e: null,
d: {x: 1},
c: false,
b: "cd",
a: 0,
} satisfies X;
type K = OrderedKeys<typeof x> // [typeof SYMBOL, "e", "d", "c", "b", "a"]
type V = OrderedValues<typeof x> // ["f", null, { x: number; }, false, "cd", number]Under the hood, it uses UnionToTuple which is more controversial / flaky (see #534). Here we only use it on the keys of an object, a union of string & Symbol without repeating values.
sindresorhus / type-fest
A collection of essential TypeScript types
14.5k
How does funding with Polar work?
1
Pay now to fund the work behind this issue.
2
Get updates on progress being made.
3
Maintainer is rewarded once the issue is completed.
FAQ
Backer
You're funding impactful open source efforts
Contributor
You want to contribute to this effort
Maintainer
You want to get funding like this too