[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [mustDefault](./js-utils.mustdefault.md) ## mustDefault() function Return the first value that is some `T`. Throw if they are all `None`. Signature: ```typescript export declare function mustDefault(...values: Array>): T; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | values | Array<[Maybe](./js-utils.maybe.md)<T>> | | Returns: T