Method stringToFieldJson

packages/blockly/core/block.ts:2204–2213

* Turns a string into the JSON definition of a label field. If the string * becomes an empty string when trimmed, this returns null. * * @param str String to turn into the JSON definition of a label field. * @returns The JSON definition or null.

(str: string)

   * @returns The JSON definition or null.
   */
  private stringToFieldJson(str: string): {text: string; type: string} | null {
    str = str.trim();
    if (str) {
      return {
        'type': 'field_label',
        'text': str,
      };
    }
    return null;
  }

  /**
   * Move a named input to a different location on this block.