message: Using indexOf to find first occurance of [
diff: @@ -460,11 +460,11 @@ function addLaunchJsonIfNecessary(generator: AssetGenerator, operations: Operati
  let existingLaunchConfigsString = JSON.stringify(existingLaunchConfigs, null, ' ');
  const lastBracket = launchJson.lastIndexOf(']');
  const lastBracketInExistingConfig = existingLaunchConfigsString.lastIndexOf(']');
  - const firstBracketInExistingConfig = existingLaunchConfigsString.lastIndexOf('[');
  + const firstBracketInExistingConfig = existingLaunchConfigsString.indexOf('[');
  if (lastBracket !== -1 && lastBracketInExistingConfig !== -1 && firstBracketInExistingConfig !== -1) {
  launchJson = launchJson.substring(0, lastBracket);
  - existingLaunchConfigsString = existingLaunchConfigsString.substring(firstBracketInExistingConfig, lastBracketInExistingConfig);
  + existingLaunchConfigsString = existingLaunchConfigsString.substring(firstBracketInExistingConfig + 1, lastBracketInExistingConfig);
  launchJson = `${launchJson},${existingLaunchConfigsString}]`;
  }
  }
  