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backend: add missing return type annotation in array.ts

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Norm 2022-10-11 01:51:17 -04:00
parent 02079593d5
commit c65559872b
Signed by untrusted user: norm
GPG key ID: 7123E30E441E80DE
1 changed files with 1 additions and 1 deletions
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packages/backend/src/prelude/array.ts
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@ -84,7 +84,7 @@ export function groupOn<T, S>(f: (x: T) => S, xs: T[]): T[][] {
return groupBy((a, b) => f(a) === f(b), xs);
}
export function groupByX<T>(collections: T[], keySelector: (x: T) => string) {
export function groupByX<T>(collections: T[], keySelector: (x: T) => string): Record<string, T[]> {
return collections.reduce((obj: Record<string, T[]>, item: T) => {
const key = keySelector(item);
if (!Object.prototype.hasOwnProperty.call(obj, key)) {