Method getContext

src/construct.ts:269–279

* Retrieves a value from tree context if present. Otherwise, would throw an error. * * Context is usually initialized at the root, but can be overridden at any point in the tree. * * @param key The context key * @returns The context value or throws error if there is no context value f

(key: string)

   * @returns The context value or throws error if there is no context value for this key
   */
  public getContext(key: string): any {
    const value = this._context?.[key];

    if (value !== undefined) { return value; }

    if (value === undefined && !this.scope?.node) {
      throw new Error(`No context value present for ${key} key`);
    }

    return this.scope && this.scope.node.getContext(key);
  }

  /**
   * Retrieves the all context of a node from tree context.