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fix: Object.groupBy return type should be a partial (#21680)

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Signed-off-by: Joel Walker <joelwalker1995@gmail.com>
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Joel Walker 2023-12-29 15:41:40 -08:00 committed by GitHub
parent fa3a12a805
commit 4740929950
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2 changed files with 7 additions and 1 deletions
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6
cli/tests/unit/globals_test.ts
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@ -196,6 +196,12 @@ Deno.test(function objectGroupBy() {
});
});
Deno.test(function objectGroupByEmpty() {
const empty: string[] = [];
const result = Object.groupBy(empty, () => "abc");
assertEquals(result.abc, undefined);
});
// Taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/groupBy#examples
Deno.test(function mapGroupBy() {
const inventory = [

2
cli/tsc/dts/lib.esnext.object.d.ts vendored
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@ -21,7 +21,7 @@ interface ObjectConstructor {
groupBy<Item, Key extends PropertyKey>(
items: Iterable<Item>,
keySelector: (item: Item, index: number) => Key,
): Record<Key, Item[]>;
): Partial<Record<Key, Item[]>>;
}
interface MapConstructor {