serialize(rawValue, _config, _indentation, _depth, _refs, _printer) {
    const decoded = rawValue.replace(
      fbtSentinelRegex,
      (_match, _quote, body) => {
        const json = Buffer.from(body, 'base64').toString('utf8');
        return `/* ${SENTINEL} start */ ${json} /* ${SENTINEL} end */`;
      },
    );
    return prettier.format(decoded, {parser: 'babel'});
  }
Serialize JS source code that contains fbt client-side code.
For readability, the JSFBT payload is deconstructed and the FBT sentinels are
replaced by inline comments.
Usage: see https://jestjs.io/docs/en/expect#expectaddsnapshotserializerserializer