GoogleChrome/lighthouse · error

Can only load ctc files

Error message

Can only load ctc files

What it means

Error "Can only load ctc files" thrown in GoogleChrome/lighthouse.

Source

Thrown at core/scripts/i18n/bake-ctc-to-lhl.js:102

    }

    // Check that all placeholders are gone.
    if (message.match(/\$\w+\$/)) {
      throw Error(`Message "${message}" is missing placeholder(s): ${message.match(/\$\w+\$/g)}`);
    }

    bakedMessages[key] = {message};
  }

  return bakedMessages;
}

/**
 * @param {string} file
 * @return {Record<string, CtcMessage>}
 */
function loadCtcStrings(file) {
  if (!file.endsWith('.ctc.json')) throw new Error('Can only load ctc files');

  return readJson(file);
}

/**
 * @param {string} path
 * @param {Record<string, LhlMessage>} localeStrings
 */
function saveLhlStrings(path, localeStrings) {
  fs.writeFileSync(path, JSON.stringify(localeStrings, null, 2) + '\n');
}

/**
 * @param {string} dir
 * @return {Array<string>}
 */
function collectAndBakeCtcStrings(dir) {
  const lhlFilenames = [];

View on GitHub (pinned to 9515cd4e58)

Solutions

1. Pass a .ctc file as input to the script.
2. Convert the file to CTC format before baking it to LHL.

When it happens

Trigger: Raised when bake-ctc-to-lhl is given a file that is not a .ctc file.

Common situations: See trigger scenarios.

AI-assisted analysis of GoogleChrome/lighthouse@9515cd4e58 (2026-08-13). Data as JSON: /api/errors/a9ce0073e4c60aca. Report an issue: GitHub.