message: assertResult with undefined
diff: // SPDX-License-Identifier: Apache-2.0
  import isFunction from './is/function';
  +import isUndefined from './is/undefined';
  type MessageFn = () => string;
  @@ -33,10 +34,10 @@ export default function assert (condition: unknown, message: string | MessageFn)
  /**
  * @name assertReturn
  - * @summart Returns when the value is truthy, otherwise throws assertion error
  + * @summart Returns when the value is not undefined, otherwise throws assertion error
  */
  -export function assertReturn <T> (value: T | undefined | null, message: string | MessageFn): T {
  - assert(value, message);
  +export function assertReturn <T> (value: T | undefined, message: string | MessageFn): T {
  + assert(!isUndefined(value), message);
  return value;
  }
  