Function isRepeaterMetadata

packages/core/src/render3/util/control_flow.ts:327–335

* Checks if a value looks like RepeaterMetadata by duck-typing. * Can't use instanceof because that would require importing from control_flow.ts.

(value: unknown)

 * Can't use instanceof because that would require importing from control_flow.ts.
 */
function isRepeaterMetadata(value: unknown): value is RepeaterMetadataShape {
  return (
    value !== null &&
    typeof value === 'object' &&
    'hasEmptyBlock' in value &&
    'trackByFn' in value &&
    typeof (value as RepeaterMetadataShape).trackByFn === 'function'
  );
}

/**
 * Returns the string representation of the track expression.