DataLoader<K extends Object, V, C> constructor

DataLoader<K extends Object, V, C>(BatchLoadFn<K, V> _batchLoadFn, [ DataLoaderOptions<K, V, C>? options ])

Main DataLoader constructor use DataLoader.unmapped if the item key K is equal to the cache key C

Implementation

DataLoader(this._batchLoadFn, [DataLoaderOptions<K, V, C>? options])
    : _maxBatchSize = _getValidMaxBatchSize(options),
      _batchScheduleFn = _getValidBatchScheduleFn(options),
      _cacheKeyFn = options?.cacheKeyFn ??
          (K == C
              ? (k) => k as C
              : throw ArgumentError(
                  'Must pass options.cacheKeyFn if the'
                  ' key type K $K is different from C $C.',
                )),
      _cacheMap = _getValidCacheMap(options);