[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [pushMergeMap](./js-utils.pushmergemap_1.md) ## pushMergeMap() function Merge the provided maps into a new map, merging keys that already exist by pushing new items. Signature: ```typescript export declare function pushMergeMap(...args: ReadonlyArray>>): Map>; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | args | ReadonlyArray<Map<TKey, TVal \| ReadonlyArray<TVal>>> | | Returns: Map<TKey, ReadonlyArray<TVal>>