// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// Lexical POSIX and Windows path operations adapted from Node.js
// `lib/path.js` at v22.16.0 (commit 9774069718d9f80578079d252dddf37ae6fd550d).
// See vendor/AVRIL.md for provenance and the full list of local differences:
// no `process` or `process.env` access (avril's permission-checked cwd op
// with drive-root fallback instead of per-drive environment entries), no
// `glob`/`matchesGlob`, no legacy `_makeLong`, and hardened primordial use.

import {
  ArrayIsArray,
  ArrayPrototypeJoin,
  ArrayPrototypePop,
  ArrayPrototypePush,
  ArrayPrototypeSlice,
  ObjectFreeze,
  StringPrototypeCharCodeAt,
  StringPrototypeIncludes,
  StringPrototypeIndexOf,
  StringPrototypeLastIndexOf,
  StringPrototypeRepeat,
  StringPrototypeSlice,
  StringPrototypeToLowerCase,
  TypeError,
} from "ext:core/primordials";
import { op_path_platform, op_process_cwd } from "ext:core/ops";
import { result } from "ext:file/errors.js";

const CHAR_UPPERCASE_A = 65; // A
const CHAR_LOWERCASE_A = 97; // a
const CHAR_UPPERCASE_Z = 90; // Z
const CHAR_LOWERCASE_Z = 122; // z
const CHAR_DOT = 46; // .
const CHAR_FORWARD_SLASH = 47; // /
const CHAR_BACKWARD_SLASH = 92; // \
const CHAR_COLON = 58; // :
const CHAR_QUESTION_MARK = 63; // ?

const hostIsWindows = op_path_platform() === "win32";

function describeReceived(value: unknown): string {
  if (value === null) return "null";
  if (typeof value !== "object") return typeof value;
  return ArrayIsArray(value) ? "an instance of Array" : "an instance of Object";
}

function validateString(value: unknown, name: string): asserts value is string {
  if (typeof value !== "string") {
    throw new TypeError(
      `The "${name}" argument must be of type string. Received ${describeReceived(value)}`,
    );
  }
}

function validateObject(value: unknown, name: string): asserts value is Record<string, unknown> {
  if (value === null || ArrayIsArray(value) || typeof value !== "object") {
    throw new TypeError(
      `The "${name}" argument must be of type Object. Received ${describeReceived(value)}`,
    );
  }
}

// Single-character string split without consulting a separator object's
// Symbol.split hook: only primitive one-code-unit separators are supported.
function splitOnChar(input: string, code: number): string[] {
  const parts: string[] = [];
  let start = 0;
  for (let i = 0; i < input.length; i++) {
    if (StringPrototypeCharCodeAt(input, i) === code) {
      ArrayPrototypePush(parts, StringPrototypeSlice(input, start, i));
      start = i + 1;
    }
  }
  ArrayPrototypePush(parts, StringPrototypeSlice(input, start, input.length));
  return parts;
}

// Permission-checked working directory. Called only when a relative,
// root-relative, or drive-relative input actually needs it; fully absolute
// inputs never reach here, so they need no read grant. A missing grant
// throws the usual PermissionDenied failure.
function nativeCwd() {
  return result(op_process_cwd());
}

function isPathSeparator(code: number): boolean {
  return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
}

function isPosixPathSeparator(code: number): boolean {
  return code === CHAR_FORWARD_SLASH;
}

function isWindowsDeviceRoot(code: number): boolean {
  return (code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z) ||
    (code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z);
}

// Resolves . and .. elements in a path with directory names
function normalizeString(path: string, allowAboveRoot: boolean, separator: string, isPathSeparator: (code: number) => boolean): string {
  let res = "";
  let lastSegmentLength = 0;
  let lastSlash = -1;
  let dots = 0;
  let code = 0;
  for (let i = 0; i <= path.length; ++i) {
    if (i < path.length) {
      code = StringPrototypeCharCodeAt(path, i);
    } else if (isPathSeparator(code)) {
      break;
    } else {
      code = CHAR_FORWARD_SLASH;
    }

    if (isPathSeparator(code)) {
      if (lastSlash === i - 1 || dots === 1) {
        // NOOP
      } else if (dots === 2) {
        if (
          res.length < 2 || lastSegmentLength !== 2 ||
          StringPrototypeCharCodeAt(res, res.length - 1) !== CHAR_DOT ||
          StringPrototypeCharCodeAt(res, res.length - 2) !== CHAR_DOT
        ) {
          if (res.length > 2) {
            const lastSlashIndex = StringPrototypeLastIndexOf(res, separator);
            if (lastSlashIndex === -1) {
              res = "";
              lastSegmentLength = 0;
            } else {
              res = StringPrototypeSlice(res, 0, lastSlashIndex);
              lastSegmentLength =
                res.length - 1 - StringPrototypeLastIndexOf(res, separator);
            }
            lastSlash = i;
            dots = 0;
            continue;
          } else if (res.length !== 0) {
            res = "";
            lastSegmentLength = 0;
            lastSlash = i;
            dots = 0;
            continue;
          }
        }
        if (allowAboveRoot) {
          res += res.length > 0 ? `${separator}..` : "..";
          lastSegmentLength = 2;
        }
      } else {
        if (res.length > 0) {
          res += `${separator}${StringPrototypeSlice(path, lastSlash + 1, i)}`;
        } else {
          res = StringPrototypeSlice(path, lastSlash + 1, i);
        }
        lastSegmentLength = i - lastSlash - 1;
      }
      lastSlash = i;
      dots = 0;
    } else if (code === CHAR_DOT && dots !== -1) {
      ++dots;
    } else {
      dots = -1;
    }
  }
  return res;
}

function formatExt(ext: string | undefined): string {
  return ext ? `${ext[0] === "." ? "" : "."}${ext}` : "";
}

function _format(sep: string, pathObject: PathFormatObject): string {
  validateObject(pathObject, "pathObject");
  const dir = pathObject.dir || pathObject.root;
  const base = pathObject.base ||
    `${pathObject.name || ""}${formatExt(pathObject.ext)}`;
  if (!dir) {
    return base;
  }
  return dir === pathObject.root ? `${dir}${base}` : `${dir}${sep}${base}`;
}

// The working directory for a Windows drive. Node reads the drive's hidden
// per-drive directory from the process environment here; avril grants no
// environment access for paths, so a cwd on another drive (or with no drive
// letter at all, as on POSIX hosts) falls back to the drive's root.
function cwdForDrive(device: string): string {
  const cwd = nativeCwd();
  if (
    cwd.length >= 2 &&
    StringPrototypeToLowerCase(StringPrototypeSlice(cwd, 0, 2)) ===
      StringPrototypeToLowerCase(device) &&
    (cwd.length === 2 ||
      StringPrototypeCharCodeAt(cwd, 2) === CHAR_BACKWARD_SLASH ||
      StringPrototypeCharCodeAt(cwd, 2) === CHAR_FORWARD_SLASH)
  ) {
    return cwd;
  }
  return `${device}\\`;
}

type PathFormatObject = { dir?: string; root?: string; base?: string; name?: string; ext?: string };
type ParsedPath = { root: string; dir: string; base: string; ext: string; name: string };
type PathApi = {
  resolve(...paths: string[]): string;
  normalize(path: string): string;
  isAbsolute(path: string): boolean;
  join(...paths: string[]): string;
  relative(from: string, to: string): string;
  toNamespacedPath(path: string): string;
  dirname(path: string): string;
  basename(path: string, suffix?: string): string;
  extname(path: string): string;
  format(pathObject: PathFormatObject): string;
  parse(path: string): ParsedPath;
  sep: string;
  delimiter: string;
};

const win32: PathApi = {
  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 = nativeCwd();
      } else {
        // We're sure the device is not a UNC path at this point, because UNC
        // paths are always absolute.
        path = cwdForDrive(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

        // If we started with a separator, we know we at least have an
        // absolute path of some kind (UNC or otherwise)
        isAbsolute = true;

        if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
          // Matched double path separator at beginning
          let j = 2;
          let last = j;
          // Match 1 or more non-path separators
          while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }
          if (j < len && j !== last) {
            const firstPart = StringPrototypeSlice(path, last, j);
            // Matched!
            last = j;
            // Match 1 or more path separators
            while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }
            if (j < len && j !== last) {
              // Matched!
              last = j;
              // Match 1 or more non-path separators
              while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
                j++;
              }
              if (j === len || j !== last) {
                // We matched a UNC root
                device = `\\\\${firstPart}\\${StringPrototypeSlice(path, last, j)}`;
                rootEnd = j;
              }
            }
          }
        } else {
          rootEnd = 1;
        }
      } else if (
        isWindowsDeviceRoot(code) &&
        StringPrototypeCharCodeAt(path, 1) === CHAR_COLON
      ) {
        // Possible device root
        device = StringPrototypeSlice(path, 0, 2);
        rootEnd = 2;
        if (len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
          // Treat separator following drive name as an absolute path
          // indicator
          isAbsolute = true;
          rootEnd = 3;
        }
      }

      if (device.length > 0) {
        if (resolvedDevice.length > 0) {
          if (
            StringPrototypeToLowerCase(device) !==
            StringPrototypeToLowerCase(resolvedDevice)
          ) {
            // This path points to another device so it is not applicable
            continue;
          }
        } else {
          resolvedDevice = device;
        }
      }

      if (resolvedAbsolute) {
        if (resolvedDevice.length > 0) {
          break;
        }
      } else {
        resolvedTail = `${StringPrototypeSlice(path, rootEnd)}\\${resolvedTail}`;
        resolvedAbsolute = isAbsolute;
        if (isAbsolute && resolvedDevice.length > 0) {
          break;
        }
      }
    }

    // At this point the path should be resolved to a full absolute path,
    // but handle relative paths to be safe (might happen when the working
    // directory lookup fails, which surfaces as PermissionDenied instead).

    // Normalize the tail path
    resolvedTail = normalizeString(
      resolvedTail,
      !resolvedAbsolute,
      "\\",
      isPathSeparator,
    );

    return resolvedAbsolute
      ? `${resolvedDevice}\\${resolvedTail}`
      : `${resolvedDevice}${resolvedTail}` || ".";
  },

  normalize(path) {
    validateString(path, "path");
    const len = path.length;
    if (len === 0) {
      return ".";
    }
    let rootEnd = 0;
    let device;
    let isAbsolute = false;
    const code = StringPrototypeCharCodeAt(path, 0);

    // Try to match a root
    if (len === 1) {
      // `path` contains just a single char, exit early to avoid
      // unnecessary work
      return isPosixPathSeparator(code) ? "\\" : path;
    }
    if (isPathSeparator(code)) {
      // Possible UNC root

      // If we started with a separator, we know we at least have an absolute
      // path of some kind (UNC or otherwise)
      isAbsolute = true;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        let j = 2;
        let last = j;
        // Match 1 or more non-path separators
        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }
        if (j < len && j !== last) {
          const firstPart = StringPrototypeSlice(path, last, j);
          // Matched!
          last = j;
          // Match 1 or more path separators
          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }
          if (j < len && j !== last) {
            // Matched!
            last = j;
            // Match 1 or more non-path separators
            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }
            if (j === len) {
              // We matched a UNC root only
              // Return the normalized version of the UNC root since there
              // is nothing left to process
              return `\\\\${firstPart}\\${StringPrototypeSlice(path, last)}\\`;
            }
            if (j !== last) {
              // We matched a UNC root with leftovers
              device = `\\\\${firstPart}\\${StringPrototypeSlice(path, last, j)}`;
              rootEnd = j;
            }
          }
        }
      } else {
        rootEnd = 1;
      }
    } else if (
      isWindowsDeviceRoot(code) &&
      StringPrototypeCharCodeAt(path, 1) === CHAR_COLON
    ) {
      // Possible device root
      device = StringPrototypeSlice(path, 0, 2);
      rootEnd = 2;
      if (len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
        // Treat separator following drive name as an absolute path
        // indicator
        isAbsolute = true;
        rootEnd = 3;
      }
    }

    let tail = rootEnd < len
      ? normalizeString(
        StringPrototypeSlice(path, rootEnd),
        !isAbsolute,
        "\\",
        isPathSeparator,
      )
      : "";
    if (tail.length === 0 && !isAbsolute) {
      tail = ".";
    }
    if (
      tail.length > 0 &&
      isPathSeparator(StringPrototypeCharCodeAt(path, len - 1))
    ) {
      tail += "\\";
    }
    if (!isAbsolute && device === undefined && StringPrototypeIncludes(path, ":")) {
      // If the original path was not absolute and if we have not been able to
      // resolve it relative to a particular device, we need to ensure that the
      // `tail` has not become something that Windows might interpret as an
      // absolute path. See CVE-2024-36139.
      if (
        tail.length >= 2 &&
        isWindowsDeviceRoot(StringPrototypeCharCodeAt(tail, 0)) &&
        StringPrototypeCharCodeAt(tail, 1) === CHAR_COLON
      ) {
        return `.\\${tail}`;
      }
      let index = StringPrototypeIndexOf(path, ":");
      do {
        if (
          index === len - 1 ||
          isPathSeparator(StringPrototypeCharCodeAt(path, index + 1))
        ) {
          return `.\\${tail}`;
        }
      } while ((index = StringPrototypeIndexOf(path, ":", index + 1)) !== -1);
    }
    if (device === undefined) {
      return isAbsolute ? `\\${tail}` : tail;
    }
    return isAbsolute ? `${device}\\${tail}` : `${device}${tail}`;
  },

  isAbsolute(path) {
    validateString(path, "path");
    const len = path.length;
    if (len === 0) {
      return false;
    }

    const code = StringPrototypeCharCodeAt(path, 0);
    return isPathSeparator(code) ||
      // Possible device root
      (len > 2 &&
        isWindowsDeviceRoot(code) &&
        StringPrototypeCharCodeAt(path, 1) === CHAR_COLON &&
        isPathSeparator(StringPrototypeCharCodeAt(path, 2)));
  },

  join(...args) {
    if (args.length === 0) {
      return ".";
    }

    let joined;
    let firstPart: string;
    for (let i = 0; i < args.length; ++i) {
      const arg = args[i];
      validateString(arg, "path");
      if (arg.length > 0) {
        if (joined === undefined) {
          joined = firstPart = arg;
        } else {
          joined += `\\${arg}`;
        }
      }
    }

    if (joined === undefined) {
      return ".";
    }

    // Make sure that the joined path doesn't start with two slashes, because
    // normalize() will mistake it for a UNC path then.
    //
    // This step is skipped when it is very clear that the user actually
    // intended to point at a UNC path. This is assumed when the first
    // non-empty string arguments starts with exactly two slashes followed by
    // at least one more non-slash character.
    //
    // Note that for normalize() to treat a path as a UNC path it needs to
    // have at least 2 components, so we don't filter for that here.
    // This means that the user can use join to construct UNC paths from
    // a server name and a share name; for example:
    //   path.join('//server', 'share') -> '\\\\server\\share\\')
    let needsReplace = true;
    let slashCount = 0;
    if (isPathSeparator(StringPrototypeCharCodeAt(firstPart!, 0))) {
      ++slashCount;
      const firstLen = firstPart!.length;
      if (
        firstLen > 1 &&
        isPathSeparator(StringPrototypeCharCodeAt(firstPart!, 1))
      ) {
        ++slashCount;
        if (firstLen > 2) {
          if (isPathSeparator(StringPrototypeCharCodeAt(firstPart!, 2))) {
            ++slashCount;
          } else {
            // We matched a UNC path in the first part
            needsReplace = false;
          }
        }
      }
    }
    if (needsReplace) {
      // Find any more consecutive slashes we need to replace
      while (
        slashCount < joined.length &&
        isPathSeparator(StringPrototypeCharCodeAt(joined, slashCount))
      ) {
        slashCount++;
      }

      // Replace the slashes if needed
      if (slashCount >= 2) {
        joined = `\\${StringPrototypeSlice(joined, slashCount)}`;
      }
    }

    return win32.normalize(joined);
  },

  relative(from, to) {
    validateString(from, "from");
    validateString(to, "to");

    if (from === to) {
      return "";
    }

    const fromOrig = win32.resolve(from);
    const toOrig = win32.resolve(to);

    if (fromOrig === toOrig) {
      return "";
    }

    from = StringPrototypeToLowerCase(fromOrig);
    to = StringPrototypeToLowerCase(toOrig);

    if (from === to) {
      return "";
    }

    if (
      fromOrig.length !== from.length || toOrig.length !== to.length
    ) {
      const fromSplit = splitOnChar(fromOrig, CHAR_BACKWARD_SLASH);
      const toSplit = splitOnChar(toOrig, CHAR_BACKWARD_SLASH);
      if (fromSplit[fromSplit.length - 1] === "") {
        ArrayPrototypePop(fromSplit);
      }
      if (toSplit[toSplit.length - 1] === "") {
        ArrayPrototypePop(toSplit);
      }

      const fromLen = fromSplit.length;
      const toLen = toSplit.length;
      const length = fromLen < toLen ? fromLen : toLen;

      let i;
      for (i = 0; i < length; i++) {
        if (
          StringPrototypeToLowerCase(fromSplit[i]) !==
          StringPrototypeToLowerCase(toSplit[i])
        ) {
          break;
        }
      }

      if (i === 0) {
        return toOrig;
      } else if (i === length) {
        if (toLen > length) {
          return ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), "\\");
        }
        if (fromLen > length) {
          return StringPrototypeRepeat("..\\", fromLen - 1 - i) + "..";
        }
        return "";
      }

      return StringPrototypeRepeat("..\\", fromLen - i) +
        ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), "\\");
    }

    // Trim any leading backslashes
    let fromStart = 0;
    while (
      fromStart < from.length &&
      StringPrototypeCharCodeAt(from, fromStart) === CHAR_BACKWARD_SLASH
    ) {
      fromStart++;
    }
    // Trim trailing backslashes (applicable to UNC paths only)
    let fromEnd = from.length;
    while (
      fromEnd - 1 > fromStart &&
      StringPrototypeCharCodeAt(from, fromEnd - 1) === CHAR_BACKWARD_SLASH
    ) {
      fromEnd--;
    }
    const fromLen = fromEnd - fromStart;

    // Trim any leading backslashes
    let toStart = 0;
    while (
      toStart < to.length &&
      StringPrototypeCharCodeAt(to, toStart) === CHAR_BACKWARD_SLASH
    ) {
      toStart++;
    }
    // Trim trailing backslashes (applicable to UNC paths only)
    let toEnd = to.length;
    while (
      toEnd - 1 > toStart &&
      StringPrototypeCharCodeAt(to, toEnd - 1) === CHAR_BACKWARD_SLASH
    ) {
      toEnd--;
    }
    const toLen = toEnd - toStart;

    // Compare paths to find the longest common path from root
    const length = fromLen < toLen ? fromLen : toLen;
    let lastCommonSep = -1;
    let i = 0;
    for (; i < length; i++) {
      const fromCode = StringPrototypeCharCodeAt(from, fromStart + i);
      if (fromCode !== StringPrototypeCharCodeAt(to, toStart + i)) {
        break;
      } else if (fromCode === CHAR_BACKWARD_SLASH) {
        lastCommonSep = i;
      }
    }

    // We found a mismatch before the first common path separator was seen, so
    // return the original `to`.
    if (i !== length) {
      if (lastCommonSep === -1) {
        return toOrig;
      }
    } else {
      if (toLen > length) {
        if (
          StringPrototypeCharCodeAt(to, toStart + i) === CHAR_BACKWARD_SLASH
        ) {
          // We get here if `from` is the exact base path for `to`.
          // For example: from='C:\\foo\\bar'; to='C:\\foo\\bar\\baz'
          return StringPrototypeSlice(toOrig, toStart + i + 1);
        }
        if (i === 2) {
          // We get here if `from` is the device root.
          // For example: from='C:\\'; to='C:\\foo'
          return StringPrototypeSlice(toOrig, toStart + i);
        }
      }
      if (fromLen > length) {
        if (
          StringPrototypeCharCodeAt(from, fromStart + i) ===
          CHAR_BACKWARD_SLASH
        ) {
          // We get here if `to` is the exact base path for `from`.
          // For example: from='C:\\foo\\bar'; to='C:\\foo'
          lastCommonSep = i;
        } else if (i === 2) {
          // We get here if `to` is the device root.
          // For example: from='C:\\foo\\bar'; to='C:\\'
          lastCommonSep = 3;
        }
      }
      if (lastCommonSep === -1) {
        lastCommonSep = 0;
      }
    }

    let out = "";
    // Generate the relative path based on the path difference between `to`
    // and `from`
    for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
      if (
        i === fromEnd ||
        StringPrototypeCharCodeAt(from, i) === CHAR_BACKWARD_SLASH
      ) {
        out += out.length === 0 ? ".." : "\\..";
      }
    }

    toStart += lastCommonSep;

    // Lastly, append the rest of the destination (`to`) path that comes after
    // the common path parts
    if (out.length > 0) {
      return `${out}${StringPrototypeSlice(toOrig, toStart, toEnd)}`;
    }

    if (StringPrototypeCharCodeAt(toOrig, toStart) === CHAR_BACKWARD_SLASH) {
      ++toStart;
    }
    return StringPrototypeSlice(toOrig, toStart, toEnd);
  },

  toNamespacedPath(path) {
    // Note: this will *probably* throw somewhere.
    if (typeof path !== "string" || path.length === 0) {
      return path;
    }

    const resolvedPath = win32.resolve(path);

    if (resolvedPath.length <= 2) {
      return path;
    }

    if (StringPrototypeCharCodeAt(resolvedPath, 0) === CHAR_BACKWARD_SLASH) {
      // Possible UNC root
      if (StringPrototypeCharCodeAt(resolvedPath, 1) === CHAR_BACKWARD_SLASH) {
        const code = StringPrototypeCharCodeAt(resolvedPath, 2);
        if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
          // Matched non-long UNC root, convert the path to a long UNC path
          return `\\\\?\\UNC\\${StringPrototypeSlice(resolvedPath, 2)}`;
        }
      }
    } else if (
      isWindowsDeviceRoot(StringPrototypeCharCodeAt(resolvedPath, 0)) &&
      StringPrototypeCharCodeAt(resolvedPath, 1) === CHAR_COLON &&
      StringPrototypeCharCodeAt(resolvedPath, 2) === CHAR_BACKWARD_SLASH
    ) {
      // Matched device root, convert the path to a long UNC path
      return `\\\\?\\${resolvedPath}`;
    }

    return resolvedPath;
  },

  dirname(path) {
    validateString(path, "path");
    const len = path.length;
    if (len === 0) {
      return ".";
    }
    let rootEnd = -1;
    let offset = 0;
    const code = StringPrototypeCharCodeAt(path, 0);

    if (len === 1) {
      // `path` contains just a path separator, exit early to avoid
      // unnecessary work or a dot.
      return isPathSeparator(code) ? path : ".";
    }

    // Try to match a root
    if (isPathSeparator(code)) {
      // Possible UNC root

      rootEnd = offset = 1;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        let j = 2;
        let last = j;
        // Match 1 or more non-path separators
        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }
        if (j < len && j !== last) {
          // Matched!
          last = j;
          // Match 1 or more path separators
          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }
          if (j < len && j !== last) {
            // Matched!
            last = j;
            // Match 1 or more non-path separators
            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }
            if (j === len) {
              // We matched a UNC root only
              return path;
            }
            if (j !== last) {
              // We matched a UNC root with leftovers

              // Offset by 1 to include the separator after the UNC root to
              // treat it as a "normal root" on top of a (UNC) root
              rootEnd = offset = j + 1;
            }
          }
        }
      }
      // Possible device root
    } else if (
      isWindowsDeviceRoot(code) &&
      StringPrototypeCharCodeAt(path, 1) === CHAR_COLON
    ) {
      rootEnd = len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2)) ? 3 : 2;
      offset = rootEnd;
    }

    let end = -1;
    let matchedSlash = true;
    for (let i = len - 1; i >= offset; --i) {
      if (isPathSeparator(StringPrototypeCharCodeAt(path, i))) {
        if (!matchedSlash) {
          end = i;
          break;
        }
      } else {
        // We saw the first non-path separator
        matchedSlash = false;
      }
    }

    if (end === -1) {
      if (rootEnd === -1) {
        return ".";
      }

      end = rootEnd;
    }
    return StringPrototypeSlice(path, 0, end);
  },

  basename(path, suffix) {
    if (suffix !== undefined) {
      validateString(suffix, "suffix");
    }
    validateString(path, "path");
    let start = 0;
    let end = -1;
    let matchedSlash = true;

    // Check for a drive letter prefix so as not to mistake the following
    // path separator as an extra separator at the end of the path that can be
    // disregarded
    if (
      path.length >= 2 &&
      isWindowsDeviceRoot(StringPrototypeCharCodeAt(path, 0)) &&
      StringPrototypeCharCodeAt(path, 1) === CHAR_COLON
    ) {
      start = 2;
    }

    if (suffix !== undefined && suffix.length > 0 && suffix.length <= path.length) {
      if (suffix === path) {
        return "";
      }
      let extIdx = suffix.length - 1;
      let firstNonSlashEnd = -1;
      for (let i = path.length - 1; i >= start; --i) {
        const code = StringPrototypeCharCodeAt(path, i);
        if (isPathSeparator(code)) {
          // If we reached a path separator that was not part of a set of path
          // separators at the end of the string, stop now
          if (!matchedSlash) {
            start = i + 1;
            break;
          }
        } else {
          if (firstNonSlashEnd === -1) {
            // We saw the first non-path separator, remember this index in case
            // we need it if the extension ends up not matching
            matchedSlash = false;
            firstNonSlashEnd = i + 1;
          }
          if (extIdx >= 0) {
            // Try to match the explicit extension
            if (code === StringPrototypeCharCodeAt(suffix, extIdx)) {
              if (--extIdx === -1) {
                // We matched the extension, so mark this as the end of our path
                // component
                end = i;
              }
            } else {
              // Extension does not match, so our result is the entire path
              // component
              extIdx = -1;
              end = firstNonSlashEnd;
            }
          }
        }
      }

      if (start === end) {
        end = firstNonSlashEnd;
      } else if (end === -1) {
        end = path.length;
      }
      return StringPrototypeSlice(path, start, end);
    }
    for (let i = path.length - 1; i >= start; --i) {
      if (isPathSeparator(StringPrototypeCharCodeAt(path, i))) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          start = i + 1;
          break;
        }
      } else if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // path component
        matchedSlash = false;
        end = i + 1;
      }
    }

    if (end === -1) {
      return "";
    }
    return StringPrototypeSlice(path, start, end);
  },

  extname(path) {
    validateString(path, "path");
    let start = 0;
    let startDot = -1;
    let startPart = 0;
    let end = -1;
    let matchedSlash = true;
    // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find
    let preDotState = 0;

    // Check for a drive letter prefix so as not to mistake the following
    // path separator as an extra separator at the end of the path that can be
    // disregarded

    if (
      path.length >= 2 &&
      StringPrototypeCharCodeAt(path, 1) === CHAR_COLON &&
      isWindowsDeviceRoot(StringPrototypeCharCodeAt(path, 0))
    ) {
      start = startPart = 2;
    }

    for (let i = path.length - 1; i >= start; --i) {
      const code = StringPrototypeCharCodeAt(path, i);
      if (isPathSeparator(code)) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }
        continue;
      }
      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }
      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) {
          startDot = i;
        } else if (preDotState !== 1) {
          preDotState = 1;
        }
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (
      startDot === -1 || end === -1 ||
      // We saw a non-dot character immediately before the dot
      preDotState === 0 ||
      // The (right-most) trimmed path component is exactly '..'
      (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
    ) {
      return "";
    }
    return StringPrototypeSlice(path, startDot, end);
  },

  format(pathObject) {
    return _format("\\", pathObject);
  },

  parse(path) {
    validateString(path, "path");

    const ret = { root: "", dir: "", base: "", ext: "", name: "" };
    if (path.length === 0) {
      return ret;
    }

    const len = path.length;
    let rootEnd = 0;
    let code = StringPrototypeCharCodeAt(path, 0);

    if (len === 1) {
      if (isPathSeparator(code)) {
        // `path` contains just a path separator, exit early to avoid
        // unnecessary work
        ret.root = ret.dir = path;
        return ret;
      }
      ret.base = ret.name = path;
      return ret;
    }
    // Try to match a root
    if (isPathSeparator(code)) {
      // Possible UNC root

      rootEnd = 1;
      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        let j = 2;
        let last = j;
        // Match 1 or more non-path separators
        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }
        if (j < len && j !== last) {
          // Matched!
          last = j;
          // Match 1 or more path separators
          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }
          if (j < len && j !== last) {
            // Matched!
            last = j;
            // Match 1 or more non-path separators
            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }
            if (j === len) {
              // We matched a UNC root only
              rootEnd = j;
            } else if (j !== last) {
              // We matched a UNC root with leftovers
              rootEnd = j + 1;
            }
          }
        }
      }
    } else if (
      isWindowsDeviceRoot(code) &&
      StringPrototypeCharCodeAt(path, 1) === CHAR_COLON
    ) {
      // Possible device root
      if (len <= 2) {
        // `path` contains just a drive root, exit early to avoid
        // unnecessary work
        ret.root = ret.dir = path;
        return ret;
      }
      rootEnd = 2;
      if (isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
        if (len === 3) {
          // `path` contains just a drive root, exit early to avoid
          // unnecessary work
          ret.root = ret.dir = path;
          return ret;
        }
        rootEnd = 3;
      }
    }
    if (rootEnd > 0) {
      ret.root = StringPrototypeSlice(path, 0, rootEnd);
    }

    let startDot = -1;
    let startPart = rootEnd;
    let end = -1;
    let matchedSlash = true;
    let i = path.length - 1;

    // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find
    let preDotState = 0;

    // Get non-dir info
    for (; i >= rootEnd; --i) {
      code = StringPrototypeCharCodeAt(path, i);
      if (isPathSeparator(code)) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }
        continue;
      }
      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }
      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) {
          startDot = i;
        } else if (preDotState !== 1) {
          preDotState = 1;
        }
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (end !== -1) {
      if (
        startDot === -1 ||
        // We saw a non-dot character immediately before the dot
        preDotState === 0 ||
        // The (right-most) trimmed path component is exactly '..'
        (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
      ) {
        ret.base = ret.name = StringPrototypeSlice(path, startPart, end);
      } else {
        ret.name = StringPrototypeSlice(path, startPart, startDot);
        ret.base = StringPrototypeSlice(path, startPart, end);
        ret.ext = StringPrototypeSlice(path, startDot, end);
      }
    }

    // If the directory is the root, use the entire root as the `dir` including
    // the trailing slash if any (`C:\abc` -> `C:\`). Otherwise, strip out the
    // trailing slash (`C:\abc\def` -> `C:\abc`).
    if (startPart > 0 && startPart !== rootEnd) {
      ret.dir = StringPrototypeSlice(path, 0, startPart - 1);
    } else {
      ret.dir = ret.root;
    }

    return ret;
  },

  sep: "\\",
  delimiter: ";",
};

// Node views a Windows working directory through POSIX eyes by converting
// separators and truncating any drive indicator.
function posixCwd() {
  if (!hostIsWindows) {
    return nativeCwd();
  }
  const cwd = nativeCwd();
  const forward = ArrayPrototypeJoin(splitOnChar(cwd, CHAR_BACKWARD_SLASH), "/");
  return StringPrototypeSlice(forward, StringPrototypeIndexOf(forward, "/"));
}

const posix: PathApi = {
  resolve(...args) {
    let resolvedPath = "";
    let resolvedAbsolute = false;

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

      // Skip empty entries
      if (path.length === 0) {
        continue;
      }

      resolvedPath = `${path}/${resolvedPath}`;
      resolvedAbsolute =
        StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    }

    if (!resolvedAbsolute) {
      const cwd = posixCwd();
      resolvedPath = `${cwd}/${resolvedPath}`;
      resolvedAbsolute =
        StringPrototypeCharCodeAt(cwd, 0) === CHAR_FORWARD_SLASH;
    }

    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when the working
    // directory lookup fails, which surfaces as PermissionDenied instead).

    // Normalize the path
    resolvedPath = normalizeString(
      resolvedPath,
      !resolvedAbsolute,
      "/",
      isPosixPathSeparator,
    );

    if (resolvedAbsolute) {
      return `/${resolvedPath}`;
    }
    return resolvedPath.length > 0 ? resolvedPath : ".";
  },

  normalize(path) {
    validateString(path, "path");

    if (path.length === 0) {
      return ".";
    }

    const isAbsolute =
      StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    const trailingSeparator =
      StringPrototypeCharCodeAt(path, path.length - 1) === CHAR_FORWARD_SLASH;

    // Normalize the path
    path = normalizeString(path, !isAbsolute, "/", isPosixPathSeparator);

    if (path.length === 0) {
      if (isAbsolute) {
        return "/";
      }
      return trailingSeparator ? "./" : ".";
    }
    if (trailingSeparator) {
      path += "/";
    }

    return isAbsolute ? `/${path}` : path;
  },

  isAbsolute(path) {
    validateString(path, "path");
    return path.length > 0 &&
      StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
  },

  join(...args) {
    if (args.length === 0) {
      return ".";
    }

    const path: string[] = [];
    for (let i = 0; i < args.length; ++i) {
      const arg = args[i];
      validateString(arg, "path");
      if (arg.length > 0) {
        ArrayPrototypePush(path, arg);
      }
    }

    if (path.length === 0) {
      return ".";
    }

    return posix.normalize(ArrayPrototypeJoin(path, "/"));
  },

  relative(from, to) {
    validateString(from, "from");
    validateString(to, "to");

    if (from === to) {
      return "";
    }

    // Trim leading forward slashes.
    from = posix.resolve(from);
    to = posix.resolve(to);

    if (from === to) {
      return "";
    }

    const fromStart = 1;
    const fromEnd = from.length;
    const fromLen = fromEnd - fromStart;
    const toStart = 1;
    const toLen = to.length - toStart;

    // Compare paths to find the longest common path from root
    const length = (fromLen < toLen ? fromLen : toLen);
    let lastCommonSep = -1;
    let i = 0;
    for (; i < length; i++) {
      const fromCode = StringPrototypeCharCodeAt(from, fromStart + i);
      if (fromCode !== StringPrototypeCharCodeAt(to, toStart + i)) {
        break;
      } else if (fromCode === CHAR_FORWARD_SLASH) {
        lastCommonSep = i;
      }
    }
    if (i === length) {
      if (toLen > length) {
        if (StringPrototypeCharCodeAt(to, toStart + i) === CHAR_FORWARD_SLASH) {
          // We get here if `from` is the exact base path for `to`.
          // For example: from='/foo/bar'; to='/foo/bar/baz'
          return StringPrototypeSlice(to, toStart + i + 1);
        }
        if (i === 0) {
          // We get here if `from` is the root
          // For example: from='/'; to='/foo'
          return StringPrototypeSlice(to, toStart + i);
        }
      } else if (fromLen > length) {
        if (
          StringPrototypeCharCodeAt(from, fromStart + i) ===
          CHAR_FORWARD_SLASH
        ) {
          // We get here if `to` is the exact base path for `from`.
          // For example: from='/foo/bar/baz'; to='/foo/bar'
          lastCommonSep = i;
        } else if (i === 0) {
          // We get here if `to` is the root.
          // For example: from='/foo/bar'; to='/'
          lastCommonSep = 0;
        }
      }
    }

    let out = "";
    // Generate the relative path based on the path difference between `to`
    // and `from`.
    for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
      if (
        i === fromEnd ||
        StringPrototypeCharCodeAt(from, i) === CHAR_FORWARD_SLASH
      ) {
        out += out.length === 0 ? ".." : "/..";
      }
    }

    // Lastly, append the rest of the destination (`to`) path that comes after
    // the common path parts.
    return `${out}${StringPrototypeSlice(to, toStart + lastCommonSep)}`;
  },

  toNamespacedPath(path) {
    // Non-op on posix systems
    return path;
  },

  dirname(path) {
    validateString(path, "path");
    if (path.length === 0) {
      return ".";
    }
    const hasRoot = StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    let end = -1;
    let matchedSlash = true;
    for (let i = path.length - 1; i >= 1; --i) {
      if (StringPrototypeCharCodeAt(path, i) === CHAR_FORWARD_SLASH) {
        if (!matchedSlash) {
          end = i;
          break;
        }
      } else {
        // We saw the first non-path separator
        matchedSlash = false;
      }
    }

    if (end === -1) {
      return hasRoot ? "/" : ".";
    }
    if (hasRoot && end === 1) {
      return "//";
    }
    return StringPrototypeSlice(path, 0, end);
  },

  basename(path, suffix) {
    if (suffix !== undefined) {
      validateString(suffix, "suffix");
    }
    validateString(path, "path");

    let start = 0;
    let end = -1;
    let matchedSlash = true;

    if (suffix !== undefined && suffix.length > 0 && suffix.length <= path.length) {
      if (suffix === path) {
        return "";
      }
      let extIdx = suffix.length - 1;
      let firstNonSlashEnd = -1;
      for (let i = path.length - 1; i >= 0; --i) {
        const code = StringPrototypeCharCodeAt(path, i);
        if (code === CHAR_FORWARD_SLASH) {
          // If we reached a path separator that was not part of a set of path
          // separators at the end of the string, stop now
          if (!matchedSlash) {
            start = i + 1;
            break;
          }
        } else {
          if (firstNonSlashEnd === -1) {
            // We saw the first non-path separator, remember this index in case
            // we need it if the extension ends up not matching
            matchedSlash = false;
            firstNonSlashEnd = i + 1;
          }
          if (extIdx >= 0) {
            // Try to match the explicit extension
            if (code === StringPrototypeCharCodeAt(suffix, extIdx)) {
              if (--extIdx === -1) {
                // We matched the extension, so mark this as the end of our path
                // component
                end = i;
              }
            } else {
              // Extension does not match, so our result is the entire path
              // component
              extIdx = -1;
              end = firstNonSlashEnd;
            }
          }
        }
      }

      if (start === end) {
        end = firstNonSlashEnd;
      } else if (end === -1) {
        end = path.length;
      }
      return StringPrototypeSlice(path, start, end);
    }
    for (let i = path.length - 1; i >= 0; --i) {
      if (StringPrototypeCharCodeAt(path, i) === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          start = i + 1;
          break;
        }
      } else if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // path component
        matchedSlash = false;
        end = i + 1;
      }
    }

    if (end === -1) {
      return "";
    }
    return StringPrototypeSlice(path, start, end);
  },

  extname(path) {
    validateString(path, "path");
    let startDot = -1;
    let startPart = 0;
    let end = -1;
    let matchedSlash = true;
    // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find
    let preDotState = 0;
    for (let i = path.length - 1; i >= 0; --i) {
      const code = StringPrototypeCharCodeAt(path, i);
      if (code === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }
        continue;
      }
      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }
      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) {
          startDot = i;
        } else if (preDotState !== 1) {
          preDotState = 1;
        }
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (
      startDot === -1 || end === -1 ||
      // We saw a non-dot character immediately before the dot
      preDotState === 0 ||
      // The (right-most) trimmed path component is exactly '..'
      (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
    ) {
      return "";
    }
    return StringPrototypeSlice(path, startDot, end);
  },

  format(pathObject) {
    return _format("/", pathObject);
  },

  parse(path) {
    validateString(path, "path");

    const ret = { root: "", dir: "", base: "", ext: "", name: "" };
    if (path.length === 0) {
      return ret;
    }
    const isAbsolute =
      StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    let start;
    if (isAbsolute) {
      ret.root = "/";
      start = 1;
    } else {
      start = 0;
    }
    let startDot = -1;
    let startPart = 0;
    let end = -1;
    let matchedSlash = true;
    let i = path.length - 1;

    // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find
    let preDotState = 0;

    // Get non-dir info
    for (; i >= start; --i) {
      const code = StringPrototypeCharCodeAt(path, i);
      if (code === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }
        continue;
      }
      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }
      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) {
          startDot = i;
        } else if (preDotState !== 1) {
          preDotState = 1;
        }
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (end !== -1) {
      const baseStart = startPart === 0 && isAbsolute ? 1 : startPart;
      if (
        startDot === -1 ||
        // We saw a non-dot character immediately before the dot
        preDotState === 0 ||
        // The (right-most) trimmed path component is exactly '..'
        (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
      ) {
        ret.base = ret.name = StringPrototypeSlice(path, baseStart, end);
      } else {
        ret.name = StringPrototypeSlice(path, baseStart, startDot);
        ret.base = StringPrototypeSlice(path, baseStart, end);
        ret.ext = StringPrototypeSlice(path, startDot, end);
      }
    }

    if (startPart > 0) {
      ret.dir = StringPrototypeSlice(path, 0, startPart - 1);
    } else if (isAbsolute) {
      ret.dir = "/";
    }

    return ret;
  },

  sep: "/",
  delimiter: ":",
};

const posixBase = ObjectFreeze({
  join: posix.join,
  resolve: posix.resolve,
  normalize: posix.normalize,
  relative: posix.relative,
  dirname: posix.dirname,
  basename: posix.basename,
  extname: posix.extname,
  isAbsolute: posix.isAbsolute,
  parse: posix.parse,
  format: posix.format,
  toNamespacedPath: posix.toNamespacedPath,
  sep: posix.sep,
  delimiter: posix.delimiter,
});

const win32Base = ObjectFreeze({
  join: win32.join,
  resolve: win32.resolve,
  normalize: win32.normalize,
  relative: win32.relative,
  dirname: win32.dirname,
  basename: win32.basename,
  extname: win32.extname,
  isAbsolute: win32.isAbsolute,
  parse: win32.parse,
  format: win32.format,
  toNamespacedPath: win32.toNamespacedPath,
  sep: win32.sep,
  delimiter: win32.delimiter,
});

export { posixBase, win32Base };
export { splitOnChar, validateString };