Function rejectionOf

test/helpers/rejection-of.ts:10–18

(promise: Promise<unknown>)

@returns The rejection reason, typed as `ExecaError` by default.
*/
export const rejectionOf = async <ErrorType = ExecaError>(promise: Promise<unknown>): Promise<ErrorType> => {
	try {
		await promise;
	} catch (error) {
		return error as ErrorType;
	}

	throw new Error('Expected the promise to reject, but it resolved.');
};