32 lines
857 B
TypeScript
32 lines
857 B
TypeScript
type Set1<T, K1 extends keyof T> = T extends any[] ? T : Pick<T, Exclude<keyof T, K1>> & {
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[SK1 in K1]-?: Required<Pick<T, SK1>>;
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}[K1];
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type Set2<T, K1 extends keyof T, K2 extends keyof T[K1]> = T extends any[] ? T : Pick<T, Exclude<keyof T, K1>> & {
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[SK1 in K1]-?: Required<{
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[key in K1]: Set1<T[K1], K2>;
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}>;
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}[K1];
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declare function set<T, K1 extends keyof T>(source: T, path: [K1], value: T[K1]): Set1<T, K1>;
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declare function set<T, K1 extends keyof T, K2 extends keyof T[K1]>(source: T, path: [K1, K2], value: T[K1][K2]): Set2<T, K1, K2>;
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interface State {
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a: {
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b: string;
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c: number;
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};
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d: boolean;
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}
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const state: State = {
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a: {
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b: "",
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c: 0,
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},
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d: false,
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};
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const newState: State = set(state, ["a", 'b'], 'why'); // shouldn't be an error
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