15 lines
381 B
TypeScript
15 lines
381 B
TypeScript
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type ValueOf<Obj> = Obj[keyof Obj];
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type OneOnly<Obj, K extends keyof Obj> = {
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[key in Exclude<keyof Obj, K>]: undefined;
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} & {
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[key in K]: Obj[K];
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};
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type OneOfByKey<Obj> = {
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[key in keyof Obj]: OneOnly<Obj, key>;
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};
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export type OneOf<T> = ValueOf<OneOfByKey<T>>;
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export type WithRequired<T, K extends keyof T> = T & {
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[P in K]-?: NonNullable<T[P]>;
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};
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export {};
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