Proposal: Partial/Complete (curry)
10
👍
0This may be a limitation in the type system, but thought I'd drop this proposal here. The idea here is that there should be some way of expressing that P is an object with keys that are a subset of the keys of T, then those keys that are missing on P from T are required to be supplied as U.
interface IComplete {
a: string;
b: string
}
function partial<T, P extends Partial<T>>(defaults: P) {
return function<U extends MissingFrom<T, P>>(remaining: U) {
const complete: T = { ...defaults, ...remaining };
return complete;
}
}
const curried = partial({a:"foo"});
const bar: IComplete = curried({b:"bar"});
const baz: IComplete = curried({b:"baz"});
sindresorhus / type-fest
A collection of essential TypeScript types
14.2k
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