Function resolveIdClassic

packages/node-resolve/src/resolveImportSpecifiers.js:37–103

({
  importSpecifier,
  packageInfoCache,
  extensions,
  mainFields,
  preserveSymlinks,
  useBrowserOverrides,
  baseDir,
  moduleDirectories,
  modulePaths,
  rootDir,
  ignoreSideEffectsForRoot
})

}

async function resolveIdClassic({
  importSpecifier,
  packageInfoCache,
  extensions,
  mainFields,
  preserveSymlinks,
  useBrowserOverrides,
  baseDir,
  moduleDirectories,
  modulePaths,
  rootDir,
  ignoreSideEffectsForRoot
}) {
  let hasModuleSideEffects = () => null;
  let hasPackageEntry = true;
  let packageBrowserField = false;
  let packageInfo;

  const filter = (pkg, pkgPath) => {
    const info = getPackageInfo({
      cache: packageInfoCache,
      extensions,
      pkg,
      pkgPath,
      mainFields,
      preserveSymlinks,
      useBrowserOverrides,
      rootDir,
      ignoreSideEffectsForRoot
    });

    ({ packageInfo, hasModuleSideEffects, hasPackageEntry, packageBrowserField } = info);

    return info.cachedPkg;
  };

  const resolveOptions = {
    basedir: baseDir,
    readFile: readCachedFile,
    isFile: isFileCached,
    isDirectory: isDirCached,
    extensions,
    includeCoreModules: false,
    moduleDirectory: moduleDirectories,
    paths: modulePaths,
    preserveSymlinks,
    packageFilter: filter
  };

  let location;
  try {
    location = await resolveImportPath(importSpecifier, resolveOptions);
  } catch (error) {
    if (error.code !== 'MODULE_NOT_FOUND') {
      throw error;
    }
    return null;
  }