@graphql-tools/graphql/typings/jsutils/AccumulatorMap.d.ts

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/**
 * ES6 Map with additional `add` method to accumulate items.
 */
export declare class AccumulatorMap<K, T> extends Map<K, Array<T>> {
    get [Symbol.toStringTag](): string;
    add(key: K, item: T): void;
}