[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [promiseRejectNull](./rc-js-util.promiserejectnull.md) ## promiseRejectNull() function Returns a Promise of rejection with the supplied error if the value is `null` or `undefined`. **Signature:** ```typescript export declare function promiseRejectNull(value: Promise | T, error: unknown): Promise>; ``` ## Parameters

Parameter	Type	Description
value	Promise<T> \| T
error	unknown

**Returns:** Promise<Exclude<T, null \| undefined>> ## Remarks See [promiseRejectNull()](./rc-js-util.promiserejectnull.md).