[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [mergeArrays](./js-utils.mergearrays_1.md) ## mergeArrays() function Signature: ```typescript export declare function mergeArrays(...parts: ReadonlyArray>): ReadonlyArray; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | parts | ReadonlyArray<TItem \| ReadonlyArray<TItem>> | | Returns: ReadonlyArray<TItem>