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Use ReadonlyArray instead of Array on input args #181

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5 changes: 3 additions & 2 deletions src/index.d.ts
Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ declare class DataLoader<K, V, C = K> {
* ]);
*
*/
loadMany(keys: K[]): Promise<V[]>;
loadMany(keys: ReadonlyArray<K>): Promise<V[]>;

/**
* Clears the value at `key` from the cache, if it exists. Returns itself for
Expand Down Expand Up @@ -70,7 +70,8 @@ declare namespace DataLoader {

// A Function, which when given an Array of keys, returns a Promise of an Array
// of values or Errors.
export type BatchLoadFn<K, V> = (keys: K[]) => PromiseLike<Array<V | Error>>;
export type BatchLoadFn<K, V> =
(keys: ReadonlyArray<K>) => PromiseLike<ReadonlyArray<V | Error>>;

// Optionally turn off batching or caching or provide a cache key function or a
// custom cache instance.
Expand Down