Function isError

packages/angular/cli/src/utilities/error.ts:22–27

* Checks if a given value is an Error-like object. * * This type guard checks if the value is an instance of `Error` or if it's an object * with `name` and `message` properties. This is useful for identifying error-like * objects that may not be direct instances of `Error` (e.g., from RxJs). *

(value: unknown)

 * @returns `true` if the value is an Error-like object, `false` otherwise.
 */
function isError(value: unknown): value is Error {
  return (
    value instanceof Error ||
    (typeof value === 'object' && value !== null && 'name' in value && 'message' in value)
  );
}

/**
 * Asserts that a given value is an Error-like object.