Method setOutput

packages/blockly/core/block.ts:1317–1339

* Set whether this block returns a value. * * @param newBoolean True if there is an output. * @param opt_check Returned type or list of returned types. Null or * undefined if any type could be returned (e.g. variable get).

(newBoolean: boolean, opt_check?: string | string[] | null)

   *     undefined if any type could be returned (e.g. variable get).
   */
  setOutput(newBoolean: boolean, opt_check?: string | string[] | null) {
    if (newBoolean) {
      if (opt_check === undefined) {
        opt_check = null;
      }
      if (!this.outputConnection) {
        this.outputConnection = this.makeConnection_(
          ConnectionType.OUTPUT_VALUE,
        );
      }
      this.outputConnection.setCheck(opt_check);
    } else {
      if (this.outputConnection) {
        if (this.outputConnection.isConnected()) {
          throw Error(
            'Must disconnect output value before removing connection.',
          );
        }
        this.outputConnection.dispose();
        this.outputConnection = null;
      }
    }
  }

  /**
   * Set whether value inputs are arranged horizontally or vertically.