batchloader/lib/batchloader.d.ts

BatchLoader is a utility for data fetching layer to reduce requests via batching written in TypeScript. Inspired by Facebook's DataLoader

import { CacheLoader, ICache } from './cacheloader';
import { MappedBatchLoader } from './mappedbatchloader';
import { IBatchLoader } from './types';
export declare type BatchLoadFn<Key, Value> = (keys: Key[]) => Value[] | Promise<Value[]>;
export declare type KeyToUniqueId<Key> = (key: Key) => string;
export declare class BatchLoader<Key, Value> implements IBatchLoader<Key, Value> {
    protected batchFn: BatchLoadFn<Key, Value>;
    protected keyToUniqueId: KeyToUniqueId<Key> | null;
    protected batchDelay: number;
    protected batchSize: number;
    protected queuedKeys: Key[];
    protected batchPromise: Promise<Value[]> | null;
    constructor(batchFn: BatchLoadFn<Key, Value>, keyToUniqueId: KeyToUniqueId<Key> | null, batchDelay?: number, batchSize?: number);
    load(key: Key): Promise<Value>;
    loadMany(keys: Key[]): Promise<Value[]>;
    mapLoader<MappedValue>(mapFn: (value: Value, key: Key) => MappedValue): MappedBatchLoader<Key, Value, MappedValue>;
    cacheLoader(cache?: ICache<Key, Value>): CacheLoader<Key, Value>;
    protected triggerBatch(): Promise<Value[]>;
    protected runBatchNow(): Promise<Value[]>;
    private maybeBatchInChunks;
    private batchInChunks;
}
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