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Use generic for object-map Record key type #448

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Use generic for object-map Record key type #448

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10 changes: 5 additions & 5 deletions packages/object-map/index.d.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
declare function map<T, U = T>(
item: Record<string, T>,
callback: (key: string, value: T) => U
): Record<string, U>;
declare function map<K extends string | symbol, T, U = T>(
item: Record<K, T>,
callback: (key: K, value: T) => U,
): Record<K, U>

export default map;
export default map
8 changes: 7 additions & 1 deletion packages/object-map/index.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,10 +13,16 @@ const test3: Record<string, string> = map(
{ a: "pple" },
(key, value) => key + value
);
type MyObject = {
k1: number,
k2: number,
}
const myObject: MyObject = { k1: 1, k2: 2 };
const test4: MyObject = map(myObject, (key: keyof MyObject, value) => value + 1);

// Not OK
// @ts-expect-error
const test4: Record<string, string> = map({ foo: 1 }, (_, value) => value + 1);
const test5: Record<string, string> = map({ foo: 1 }, (_, value) => value + 1);
// @ts-expect-error
map();
// @ts-expect-error
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