fix(path): Remove non node symbols (#18630)

- preserve referential invariants (e.g. path.posix === posix)
- remove glob and separator exports
- save removal of fromFileUrl and toFileUrl for a different PR as that
refactor is more involved
- addresses #18177 

1 files changed, 1025 insertions, 0 deletions

diff --git a/ext/node/polyfills/path/_win32.ts b/ext/node/polyfills/path/_win32.ts
new file mode 100644
index 000000000..73321e709
--- /dev/null
+++ b/ext/node/polyfills/path/_win32.ts
@@ -0,0 +1,1025 @@
+// Copyright the Browserify authors. MIT License.
+// Ported from https://github.com/browserify/path-browserify/
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import type {
+  FormatInputPathObject,
+  ParsedPath,
+} from "ext:deno_node/path/_interface.ts";
+import {
+  CHAR_BACKWARD_SLASH,
+  CHAR_COLON,
+  CHAR_DOT,
+  CHAR_QUESTION_MARK,
+} from "ext:deno_node/path/_constants.ts";
+import { ERR_INVALID_ARG_TYPE } from "ext:deno_node/internal/errors.ts";
+
+import {
+  _format,
+  assertPath,
+  encodeWhitespace,
+  isPathSeparator,
+  isWindowsDeviceRoot,
+  normalizeString,
+} from "ext:deno_node/path/_util.ts";
+import { assert } from "ext:deno_node/_util/asserts.ts";
+
+export const sep = "\\";
+export const delimiter = ";";
+
+/**
+ * Resolves path segments into a `path`
+ * @param pathSegments to process to path
+ */
+export function resolve(...pathSegments: string[]): string {
+  let resolvedDevice = "";
+  let resolvedTail = "";
+  let resolvedAbsolute = false;
+
+  for (let i = pathSegments.length - 1; i >= -1; i--) {
+    let path: string;
+    // deno-lint-ignore no-explicit-any
+    const { Deno } = globalThis as any;
+    if (i >= 0) {
+      path = pathSegments[i];
+    } else if (!resolvedDevice) {
+      if (typeof Deno?.cwd !== "function") {
+        throw new TypeError("Resolved a drive-letter-less path without a CWD.");
+      }
+      path = Deno.cwd();
+    } else {
+      if (
+        typeof Deno?.env?.get !== "function" || typeof Deno?.cwd !== "function"
+      ) {
+        throw new TypeError("Resolved a relative path without a CWD.");
+      }
+      path = Deno.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 ||
+        path.slice(0, 3).toLowerCase() !== `${resolvedDevice.toLowerCase()}\\`
+      ) {
+        path = `${resolvedDevice}\\`;
+      }
+    }
+
+    assertPath(path);
+
+    const len = path.length;
+
+    // Skip empty entries
+    if (len === 0) continue;
+
+    let rootEnd = 0;
+    let device = "";
+    let isAbsolute = false;
+    const code = path.charCodeAt(0);
+
+    // Try to match a root
+    if (len > 1) {
+      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(path.charCodeAt(1))) {
+          // Matched double path separator at beginning
+          let j = 2;
+          let last = j;
+          // Match 1 or more non-path separators
+          for (; j < len; ++j) {
+            if (isPathSeparator(path.charCodeAt(j))) break;
+          }
+          if (j < len && j !== last) {
+            const firstPart = path.slice(last, j);
+            // Matched!
+            last = j;
+            // Match 1 or more path separators
+            for (; j < len; ++j) {
+              if (!isPathSeparator(path.charCodeAt(j))) break;
+            }
+            if (j < len && j !== last) {
+              // Matched!
+              last = j;
+              // Match 1 or more non-path separators
+              for (; j < len; ++j) {
+                if (isPathSeparator(path.charCodeAt(j))) break;
+              }
+              if (j === len) {
+                // We matched a UNC root only
+                device = `\\\\${firstPart}\\${path.slice(last)}`;
+                rootEnd = j;
+              } else if (j !== last) {
+                // We matched a UNC root with leftovers
+
+                device = `\\\\${firstPart}\\${path.slice(last, j)}`;
+                rootEnd = j;
+              }
+            }
+          }
+        } else {
+          rootEnd = 1;
+        }
+      } else if (isWindowsDeviceRoot(code)) {
+        // Possible device root
+
+        if (path.charCodeAt(1) === CHAR_COLON) {
+          device = path.slice(0, 2);
+          rootEnd = 2;
+          if (len > 2) {
+            if (isPathSeparator(path.charCodeAt(2))) {
+              // Treat separator following drive name as an absolute path
+              // indicator
+              isAbsolute = true;
+              rootEnd = 3;
+            }
+          }
+        }
+      }
+    } else if (isPathSeparator(code)) {
+      // `path` contains just a path separator
+      rootEnd = 1;
+      isAbsolute = true;
+    }
+
+    if (
+      device.length > 0 &&
+      resolvedDevice.length > 0 &&
+      device.toLowerCase() !== resolvedDevice.toLowerCase()
+    ) {
+      // This path points to another device so it is not applicable
+      continue;
+    }
+
+    if (resolvedDevice.length === 0 && device.length > 0) {
+      resolvedDevice = device;
+    }
+    if (!resolvedAbsolute) {
+      resolvedTail = `${path.slice(rootEnd)}\\${resolvedTail}`;
+      resolvedAbsolute = isAbsolute;
+    }
+
+    if (resolvedAbsolute && 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 process.cwd()
+  // fails)
+
+  // Normalize the tail path
+  resolvedTail = normalizeString(
+    resolvedTail,
+    !resolvedAbsolute,
+    "\\",
+    isPathSeparator,
+  );
+
+  return resolvedDevice + (resolvedAbsolute ? "\\" : "") + resolvedTail || ".";
+}
+
+/**
+ * Normalizes a `path`
+ * @param path to normalize
+ */
+export function normalize(path: string): string {
+  assertPath(path);
+  const len = path.length;
+  if (len === 0) return ".";
+  let rootEnd = 0;
+  let device: string | undefined;
+  let isAbsolute = false;
+  const code = path.charCodeAt(0);
+
+  // Try to match a root
+  if (len > 1) {
+    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(path.charCodeAt(1))) {
+        // Matched double path separator at beginning
+        let j = 2;
+        let last = j;
+        // Match 1 or more non-path separators
+        for (; j < len; ++j) {
+          if (isPathSeparator(path.charCodeAt(j))) break;
+        }
+        if (j < len && j !== last) {
+          const firstPart = path.slice(last, j);
+          // Matched!
+          last = j;
+          // Match 1 or more path separators
+          for (; j < len; ++j) {
+            if (!isPathSeparator(path.charCodeAt(j))) break;
+          }
+          if (j < len && j !== last) {
+            // Matched!
+            last = j;
+            // Match 1 or more non-path separators
+            for (; j < len; ++j) {
+              if (isPathSeparator(path.charCodeAt(j))) break;
+            }
+            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}\\${path.slice(last)}\\`;
+            } else if (j !== last) {
+              // We matched a UNC root with leftovers
+
+              device = `\\\\${firstPart}\\${path.slice(last, j)}`;
+              rootEnd = j;
+            }
+          }
+        }
+      } else {
+        rootEnd = 1;
+      }
+    } else if (isWindowsDeviceRoot(code)) {
+      // Possible device root
+
+      if (path.charCodeAt(1) === CHAR_COLON) {
+        device = path.slice(0, 2);
+        rootEnd = 2;
+        if (len > 2) {
+          if (isPathSeparator(path.charCodeAt(2))) {
+            // Treat separator following drive name as an absolute path
+            // indicator
+            isAbsolute = true;
+            rootEnd = 3;
+          }
+        }
+      }
+    }
+  } else if (isPathSeparator(code)) {
+    // `path` contains just a path separator, exit early to avoid unnecessary
+    // work
+    return "\\";
+  }
+
+  let tail: string;
+  if (rootEnd < len) {
+    tail = normalizeString(
+      path.slice(rootEnd),
+      !isAbsolute,
+      "\\",
+      isPathSeparator,
+    );
+  } else {
+    tail = "";
+  }
+  if (tail.length === 0 && !isAbsolute) tail = ".";
+  if (tail.length > 0 && isPathSeparator(path.charCodeAt(len - 1))) {
+    tail += "\\";
+  }
+  if (device === undefined) {
+    if (isAbsolute) {
+      if (tail.length > 0) return `\\${tail}`;
+      else return "\\";
+    } else if (tail.length > 0) {
+      return tail;
+    } else {
+      return "";
+    }
+  } else if (isAbsolute) {
+    if (tail.length > 0) return `${device}\\${tail}`;
+    else return `${device}\\`;
+  } else if (tail.length > 0) {
+    return device + tail;
+  } else {
+    return device;
+  }
+}
+
+/**
+ * Verifies whether path is absolute
+ * @param path to verify
+ */
+export function isAbsolute(path: string): boolean {
+  assertPath(path);
+  const len = path.length;
+  if (len === 0) return false;
+
+  const code = path.charCodeAt(0);
+  if (isPathSeparator(code)) {
+    return true;
+  } else if (isWindowsDeviceRoot(code)) {
+    // Possible device root
+
+    if (len > 2 && path.charCodeAt(1) === CHAR_COLON) {
+      if (isPathSeparator(path.charCodeAt(2))) return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Join all given a sequence of `paths`,then normalizes the resulting path.
+ * @param paths to be joined and normalized
+ */
+export function join(...paths: string[]): string {
+  const pathsCount = paths.length;
+  if (pathsCount === 0) return ".";
+
+  let joined: string | undefined;
+  let firstPart: string | null = null;
+  for (let i = 0; i < pathsCount; ++i) {
+    const path = paths[i];
+    assertPath(path);
+    if (path.length > 0) {
+      if (joined === undefined) joined = firstPart = path;
+      else joined += `\\${path}`;
+    }
+  }
+
+  if (joined === undefined) return ".";
+
+  // Make sure that the joined path doesn't start with two slashes, because
+  // normalize() will mistake it for an UNC path then.
+  //
+  // This step is skipped when it is very clear that the user actually
+  // intended to point at an 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 an 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;
+  assert(firstPart != null);
+  if (isPathSeparator(firstPart.charCodeAt(0))) {
+    ++slashCount;
+    const firstLen = firstPart.length;
+    if (firstLen > 1) {
+      if (isPathSeparator(firstPart.charCodeAt(1))) {
+        ++slashCount;
+        if (firstLen > 2) {
+          if (isPathSeparator(firstPart.charCodeAt(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
+    for (; slashCount < joined.length; ++slashCount) {
+      if (!isPathSeparator(joined.charCodeAt(slashCount))) break;
+    }
+
+    // Replace the slashes if needed
+    if (slashCount >= 2) joined = `\\${joined.slice(slashCount)}`;
+  }
+
+  return normalize(joined);
+}
+
+/**
+ * It will solve the relative path from `from` to `to`, for instance:
+ *  from = 'C:\\orandea\\test\\aaa'
+ *  to = 'C:\\orandea\\impl\\bbb'
+ * The output of the function should be: '..\\..\\impl\\bbb'
+ * @param from relative path
+ * @param to relative path
+ */
+export function relative(from: string, to: string): string {
+  assertPath(from);
+  assertPath(to);
+
+  if (from === to) return "";
+
+  const fromOrig = resolve(from);
+  const toOrig = resolve(to);
+
+  if (fromOrig === toOrig) return "";
+
+  from = fromOrig.toLowerCase();
+  to = toOrig.toLowerCase();
+
+  if (from === to) return "";
+
+  // Trim any leading backslashes
+  let fromStart = 0;
+  let fromEnd = from.length;
+  for (; fromStart < fromEnd; ++fromStart) {
+    if (from.charCodeAt(fromStart) !== CHAR_BACKWARD_SLASH) break;
+  }
+  // Trim trailing backslashes (applicable to UNC paths only)
+  for (; fromEnd - 1 > fromStart; --fromEnd) {
+    if (from.charCodeAt(fromEnd - 1) !== CHAR_BACKWARD_SLASH) break;
+  }
+  const fromLen = fromEnd - fromStart;
+
+  // Trim any leading backslashes
+  let toStart = 0;
+  let toEnd = to.length;
+  for (; toStart < toEnd; ++toStart) {
+    if (to.charCodeAt(toStart) !== CHAR_BACKWARD_SLASH) break;
+  }
+  // Trim trailing backslashes (applicable to UNC paths only)
+  for (; toEnd - 1 > toStart; --toEnd) {
+    if (to.charCodeAt(toEnd - 1) !== CHAR_BACKWARD_SLASH) break;
+  }
+  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) {
+    if (i === length) {
+      if (toLen > length) {
+        if (to.charCodeAt(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 toOrig.slice(toStart + i + 1);
+        } else if (i === 2) {
+          // We get here if `from` is the device root.
+          // For example: from='C:\\'; to='C:\\foo'
+          return toOrig.slice(toStart + i);
+        }
+      }
+      if (fromLen > length) {
+        if (from.charCodeAt(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;
+        }
+      }
+      break;
+    }
+    const fromCode = from.charCodeAt(fromStart + i);
+    const toCode = to.charCodeAt(toStart + i);
+    if (fromCode !== toCode) 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 && lastCommonSep === -1) {
+    return toOrig;
+  }
+
+  let out = "";
+  if (lastCommonSep === -1) lastCommonSep = 0;
+  // Generate the relative path based on the path difference between `to` and
+  // `from`
+  for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
+    if (i === fromEnd || from.charCodeAt(i) === CHAR_BACKWARD_SLASH) {
+      if (out.length === 0) out += "..";
+      else out += "\\..";
+    }
+  }
+
+  // Lastly, append the rest of the destination (`to`) path that comes after
+  // the common path parts
+  if (out.length > 0) {
+    return out + toOrig.slice(toStart + lastCommonSep, toEnd);
+  } else {
+    toStart += lastCommonSep;
+    if (toOrig.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) ++toStart;
+    return toOrig.slice(toStart, toEnd);
+  }
+}
+
+/**
+ * Resolves path to a namespace path
+ * @param path to resolve to namespace
+ */
+export function toNamespacedPath(path: string): string {
+  // Note: this will *probably* throw somewhere.
+  if (typeof path !== "string") return path;
+  if (path.length === 0) return "";
+
+  const resolvedPath = resolve(path);
+
+  if (resolvedPath.length >= 3) {
+    if (resolvedPath.charCodeAt(0) === CHAR_BACKWARD_SLASH) {
+      // Possible UNC root
+
+      if (resolvedPath.charCodeAt(1) === CHAR_BACKWARD_SLASH) {
+        const code = resolvedPath.charCodeAt(2);
+        if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
+          // Matched non-long UNC root, convert the path to a long UNC path
+          return `\\\\?\\UNC\\${resolvedPath.slice(2)}`;
+        }
+      }
+    } else if (isWindowsDeviceRoot(resolvedPath.charCodeAt(0))) {
+      // Possible device root
+
+      if (
+        resolvedPath.charCodeAt(1) === CHAR_COLON &&
+        resolvedPath.charCodeAt(2) === CHAR_BACKWARD_SLASH
+      ) {
+        // Matched device root, convert the path to a long UNC path
+        return `\\\\?\\${resolvedPath}`;
+      }
+    }
+  }
+
+  return path;
+}
+
+/**
+ * Return the directory name of a `path`.
+ * @param path to determine name for
+ */
+export function dirname(path: string): string {
+  assertPath(path);
+  const len = path.length;
+  if (len === 0) return ".";
+  let rootEnd = -1;
+  let end = -1;
+  let matchedSlash = true;
+  let offset = 0;
+  const code = path.charCodeAt(0);
+
+  // Try to match a root
+  if (len > 1) {
+    if (isPathSeparator(code)) {
+      // Possible UNC root
+
+      rootEnd = offset = 1;
+
+      if (isPathSeparator(path.charCodeAt(1))) {
+        // Matched double path separator at beginning
+        let j = 2;
+        let last = j;
+        // Match 1 or more non-path separators
+        for (; j < len; ++j) {
+          if (isPathSeparator(path.charCodeAt(j))) break;
+        }
+        if (j < len && j !== last) {
+          // Matched!
+          last = j;
+          // Match 1 or more path separators
+          for (; j < len; ++j) {
+            if (!isPathSeparator(path.charCodeAt(j))) break;
+          }
+          if (j < len && j !== last) {
+            // Matched!
+            last = j;
+            // Match 1 or more non-path separators
+            for (; j < len; ++j) {
+              if (isPathSeparator(path.charCodeAt(j))) break;
+            }
+            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;
+            }
+          }
+        }
+      }
+    } else if (isWindowsDeviceRoot(code)) {
+      // Possible device root
+
+      if (path.charCodeAt(1) === CHAR_COLON) {
+        rootEnd = offset = 2;
+        if (len > 2) {
+          if (isPathSeparator(path.charCodeAt(2))) rootEnd = offset = 3;
+        }
+      }
+    }
+  } else if (isPathSeparator(code)) {
+    // `path` contains just a path separator, exit early to avoid
+    // unnecessary work
+    return path;
+  }
+
+  for (let i = len - 1; i >= offset; --i) {
+    if (isPathSeparator(path.charCodeAt(i))) {
+      if (!matchedSlash) {
+        end = i;
+        break;
+      }
+    } else {
+      // We saw the first non-path separator
+      matchedSlash = false;
+    }
+  }
+
+  if (end === -1) {
+    if (rootEnd === -1) return ".";
+    else end = rootEnd;
+  }
+  return path.slice(0, end);
+}
+
+/**
+ * Return the last portion of a `path`. Trailing directory separators are ignored.
+ * @param path to process
+ * @param ext of path directory
+ */
+export function basename(path: string, ext = ""): string {
+  if (ext !== undefined && typeof ext !== "string") {
+    throw new ERR_INVALID_ARG_TYPE("ext", ["string"], ext);
+  }
+
+  assertPath(path);
+
+  let start = 0;
+  let end = -1;
+  let matchedSlash = true;
+  let i: number;
+
+  // 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) {
+    const drive = path.charCodeAt(0);
+    if (isWindowsDeviceRoot(drive)) {
+      if (path.charCodeAt(1) === CHAR_COLON) start = 2;
+    }
+  }
+
+  if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
+    if (ext.length === path.length && ext === path) return "";
+    let extIdx = ext.length - 1;
+    let firstNonSlashEnd = -1;
+    for (i = path.length - 1; i >= start; --i) {
+      const code = path.charCodeAt(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 === ext.charCodeAt(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 path.slice(start, end);
+  } else {
+    for (i = path.length - 1; i >= start; --i) {
+      if (isPathSeparator(path.charCodeAt(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 path.slice(start, end);
+  }
+}
+
+/**
+ * Return the extension of the `path`.
+ * @param path with extension
+ */
+export function extname(path: string): string {
+  assertPath(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 &&
+    path.charCodeAt(1) === CHAR_COLON &&
+    isWindowsDeviceRoot(path.charCodeAt(0))
+  ) {
+    start = startPart = 2;
+  }
+
+  for (let i = path.length - 1; i >= start; --i) {
+    const code = path.charCodeAt(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 path.slice(startDot, end);
+}
+
+/**
+ * Generate a path from `FormatInputPathObject` object.
+ * @param pathObject with path
+ */
+export function format(pathObject: FormatInputPathObject): string {
+  if (pathObject === null || typeof pathObject !== "object") {
+    throw new ERR_INVALID_ARG_TYPE("pathObject", ["Object"], pathObject);
+  }
+  return _format("\\", pathObject);
+}
+
+/**
+ * Return a `ParsedPath` object of the `path`.
+ * @param path to process
+ */
+export function parse(path: string): ParsedPath {
+  assertPath(path);
+
+  const ret: ParsedPath = { root: "", dir: "", base: "", ext: "", name: "" };
+
+  const len = path.length;
+  if (len === 0) return ret;
+
+  let rootEnd = 0;
+  let code = path.charCodeAt(0);
+
+  // Try to match a root
+  if (len > 1) {
+    if (isPathSeparator(code)) {
+      // Possible UNC root
+
+      rootEnd = 1;
+      if (isPathSeparator(path.charCodeAt(1))) {
+        // Matched double path separator at beginning
+        let j = 2;
+        let last = j;
+        // Match 1 or more non-path separators
+        for (; j < len; ++j) {
+          if (isPathSeparator(path.charCodeAt(j))) break;
+        }
+        if (j < len && j !== last) {
+          // Matched!
+          last = j;
+          // Match 1 or more path separators
+          for (; j < len; ++j) {
+            if (!isPathSeparator(path.charCodeAt(j))) break;
+          }
+          if (j < len && j !== last) {
+            // Matched!
+            last = j;
+            // Match 1 or more non-path separators
+            for (; j < len; ++j) {
+              if (isPathSeparator(path.charCodeAt(j))) break;
+            }
+            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)) {
+      // Possible device root
+
+      if (path.charCodeAt(1) === CHAR_COLON) {
+        rootEnd = 2;
+        if (len > 2) {
+          if (isPathSeparator(path.charCodeAt(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;
+          }
+        } else {
+          // `path` contains just a drive root, exit early to avoid
+          // unnecessary work
+          ret.root = ret.dir = path;
+          return ret;
+        }
+      }
+    }
+  } else if (isPathSeparator(code)) {
+    // `path` contains just a path separator, exit early to avoid
+    // unnecessary work
+    ret.root = ret.dir = path;
+    return ret;
+  }
+
+  if (rootEnd > 0) ret.root = path.slice(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 = path.charCodeAt(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)
+  ) {
+    if (end !== -1) {
+      ret.base = ret.name = path.slice(startPart, end);
+    }
+  } else {
+    ret.name = path.slice(startPart, startDot);
+    ret.base = path.slice(startPart, end);
+    ret.ext = path.slice(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 = path.slice(0, startPart - 1);
+  } else ret.dir = ret.root;
+
+  return ret;
+}
+
+/**
+ * Converts a file URL to a path string.
+ *
+ * ```ts
+ *      fromFileUrl("file:///home/foo"); // "\\home\\foo"
+ *      fromFileUrl("file:///C:/Users/foo"); // "C:\\Users\\foo"
+ *      fromFileUrl("file://localhost/home/foo"); // "\\\\localhost\\home\\foo"
+ * ```
+ * @param url of a file URL
+ */
+export function fromFileUrl(url: string | URL): string {
+  url = url instanceof URL ? url : new URL(url);
+  if (url.protocol != "file:") {
+    throw new TypeError("Must be a file URL.");
+  }
+  let path = decodeURIComponent(
+    url.pathname.replace(/\//g, "\\").replace(/%(?![0-9A-Fa-f]{2})/g, "%25"),
+  ).replace(/^\\*([A-Za-z]:)(\\|$)/, "$1\\");
+  if (url.hostname != "") {
+    // Note: The `URL` implementation guarantees that the drive letter and
+    // hostname are mutually exclusive. Otherwise it would not have been valid
+    // to append the hostname and path like this.
+    path = `\\\\${url.hostname}${path}`;
+  }
+  return path;
+}
+
+/**
+ * Converts a path string to a file URL.
+ *
+ * ```ts
+ *      toFileUrl("\\home\\foo"); // new URL("file:///home/foo")
+ *      toFileUrl("C:\\Users\\foo"); // new URL("file:///C:/Users/foo")
+ *      toFileUrl("\\\\127.0.0.1\\home\\foo"); // new URL("file://127.0.0.1/home/foo")
+ * ```
+ * @param path to convert to file URL
+ */
+export function toFileUrl(path: string): URL {
+  if (!isAbsolute(path)) {
+    throw new TypeError("Must be an absolute path.");
+  }
+  const [, hostname, pathname] = path.match(
+    /^(?:[/\\]{2}([^/\\]+)(?=[/\\](?:[^/\\]|$)))?(.*)/,
+  )!;
+  const url = new URL("file:///");
+  url.pathname = encodeWhitespace(pathname.replace(/%/g, "%25"));
+  if (hostname != null && hostname != "localhost") {
+    url.hostname = hostname;
+    if (!url.hostname) {
+      throw new TypeError("Invalid hostname.");
+    }
+  }
+  return url;
+}
+
+export default {
+  basename,
+  delimiter,
+  dirname,
+  extname,
+  format,
+  fromFileUrl,
+  isAbsolute,
+  join,
+  normalize,
+  parse,
+  relative,
+  resolve,
+  sep,
+  toFileUrl,
+  toNamespacedPath,
+};