Method defineMetadata

packages/metadata/src/reflect.ts:27–39

* define metadata for a target class or it's property/method

(
    metadataKey: string,
    metadataValue: any,
    target: Object,
    propertyKey?: string,
  )

   * define metadata for a target class or it's property/method
   */
  defineMetadata(
    metadataKey: string,
    metadataValue: any,
    target: Object,
    propertyKey?: string,
  ) {
    metadataKey = this.getMetadataKey(metadataKey);
    if (propertyKey) {
      Reflect.defineMetadata(metadataKey, metadataValue, target, propertyKey);
    } else {
      Reflect.defineMetadata(metadataKey, metadataValue, target);
    }
  }

  /**
   * lookup metadata from a target object and its prototype chain