getExportSpecifiersByFile = async absFilePath => {
  await init;
  const exportFile = await readFile(absFilePath, 'utf-8');
  // eslint-disable-next-line
  const [_, exports] = parse(exportFile);
  // @ts-ignore
  return exports;
}
Get export specifiers, declared in a js file given with `filePath`
@see {@link https://www.npmjs.com/package/es-module-lexer}
@param {string} absFilePath
@returns {Promise<string[]>}