Function readFile

src/renderer/upgrade/UpgradeFile.ts:21–27

(jsonFolder: string, onError?: (error: string) => void)

   * @param onError Called for each error that occurs while parsing.
   */
  export function readFile(jsonFolder: string, onError?: (error: string) => void): Promise<UpgradeStage[]> {
    return new Promise((resolve, reject) => {
      readJsonFile(path.join(jsonFolder, filePath), fileEncoding)
      .then(json => resolve(parseFile(json, onError)))
      .catch(reject);
    });
  }

  function parseFile(data: any, onError?: (error: string) => void): UpgradeStage[] {
    const parser = new ObjectParser({