Function resolve

lib/path.js:190–344

* path.resolve([from ...], to) * @param {...string} args * @returns {string}

(...args)

   * @returns {string}
   */
  resolve(...args) {
    let resolvedDevice = '';
    let resolvedTail = '';
    let resolvedAbsolute = false;

    for (let i = args.length - 1; i >= -1; i--) {
      let path;
      if (i >= 0) {
        path = args[i];
        validateString(path, `paths[${i}]`);

        // Skip empty entries
        if (path.length === 0) {
          continue;
        }
      } else if (resolvedDevice.length === 0) {
        path = process.cwd();
        // Fast path for current directory
        if (args.length === 0 || ((args.length === 1 && (args[0] === '' || args[0] === '.')) &&
            isPathSeparator(StringPrototypeCharCodeAt(path, 0)))) {
          if (!isWindows) {
            path = StringPrototypeReplace(path, forwardSlashRegExp, '\\');
          }
          return path;
        }
      } else {
        // Windows has the concept of drive-specific current working
        // directories. If we've resolved a drive letter but not yet an
        // absolute path, get cwd for that drive, or the process cwd if
        // the drive cwd is not available. We're sure the device is not
        // a UNC path at this points, because UNC paths are always absolute.
        path = process.env[`=${resolvedDevice}`] || process.cwd();

        // Verify that a cwd was found and that it actually points
        // to our drive. If not, default to the drive's root.
        if (path === undefined ||
            (StringPrototypeToLowerCase(StringPrototypeSlice(path, 0, 2)) !==
            StringPrototypeToLowerCase(resolvedDevice) &&
            StringPrototypeCharCodeAt(path, 2) === CHAR_BACKWARD_SLASH)) {
          path = `${resolvedDevice}\\`;
        }
      }

      const len = path.length;
      let rootEnd = 0;
      let device = '';
      let isAbsolute = false;
      const code = StringPrototypeCharCodeAt(path, 0);

      // Try to match a root
      if (len === 1) {
        if (isPathSeparator(code)) {
          // `path` contains just a path separator
          rootEnd = 1;
          isAbsolute = true;
        }
      } else if (isPathSeparator(code)) {
        // Possible UNC root