[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [mergeArray](./js-utils.mergearray_1.md) ## mergeArray() function Signature: ```typescript export declare function mergeArray(...parts: ReadonlyArray>): ReadonlyArray; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | parts | ReadonlyArray<TItem \| ReadonlyArray<TItem>> | | Returns: ReadonlyArray<TItem>