Function isPromise

src/utils.ts:38–43

(value?: T | PromiseLike<T>)

 * A simple function to test if the value is a promise/thenable
 */
export function isPromise<T>(value?: T | PromiseLike<T>): value is PromiseLike<T> {
  return value != null
    && typeof value === 'object'
    && 'then' in value
    && typeof value.then === 'function'
}

/** @returns true if the error is `ERR_UNKNOWN_FILE_EXTENSION` */
export function isLoaderError(error: unknown): error is Error {