Method contains

packages/context/src/context.ts:461–464

* Check if a binding exists with the given key in the local context without * delegating to the parent context * @param key - Binding key

(key: BindingAddress)

   * @param key - Binding key
   */
  contains(key: BindingAddress): boolean {
    key = BindingKey.validate(key);
    return this.registry.has(key);
  }

  /**
   * Check if a key is bound in the context or its ancestors