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feat: more idiomatic element filters [POC]

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dwelle
2025-05-06 13:11:45 +02:00
parent cec5232a7a
commit 32da1819f9
4 changed files with 107 additions and 28 deletions
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25
packages/common/src/utility-types.ts
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@@ -68,3 +68,28 @@ export type MaybePromise<T> = T | Promise<T>;
// get union of all keys from the union of types
export type AllPossibleKeys<T> = T extends any ? keyof T : never;
// utlity types for filter helper and related data structures
// -----------------------------------------------------------------------------
export type ReadonlyArrayOrMap<
T,
K = T extends { id: string } ? T["id"] : string,
> = readonly T[] | ReadonlyMap<K, T>;
export type GenericAccumulator<T = unknown> = Set<T> | Map<T, T> | Array<T>;
export type ArrayAccumulator<T = unknown> = Array<T>;
export type MapAccumulator<T = unknown, K = unknown> = Map<T, K>;
export type SetAccumulator<T = unknown> = Set<T>;
export type OutputAccumulator<
Accumulator,
OutputType,
Attr extends keyof OutputType = never,
> = Accumulator extends SetAccumulator
? Set<[Attr] extends [never] ? OutputType : Attr>
: Accumulator extends MapAccumulator
? Map<
OutputType extends { id: string } ? OutputType["id"] : string,
OutputType
>
: Array<OutputType>;
// -----------------------------------------------------------------------------