Function warnTypelessPackageJsonFile

lib/internal/modules/esm/get_format.js:145–156

(pjsonPath, url)

let typelessPackageJsonFilesWarnedAbout;
function warnTypelessPackageJsonFile(pjsonPath, url) {
  typelessPackageJsonFilesWarnedAbout ??= new SafeSet();
  if (!underNodeModules(url) && !typelessPackageJsonFilesWarnedAbout.has(pjsonPath)) {
    const warning = `Module type of ${url} is not specified and it doesn't parse as CommonJS.\n` +
      'Reparsing as ES module because module syntax was detected. This incurs a performance overhead.\n' +
      `To eliminate this warning, add "type": "module" to ${pjsonPath}.`;
    process.emitWarning(warning, {
      code: 'MODULE_TYPELESS_PACKAGE_JSON',
    });
    typelessPackageJsonFilesWarnedAbout.add(pjsonPath);
  }
}

/**
 * @param {URL} url