fix(ext/node): support junction symlinks on Windows (#22762)

Fixes https://github.com/denoland/deno/issues/20609

Vitepress support! `vitepress dev` and `vitepress build` via BYONM

Cargo.lock

@@ -1425,6 +1425,7 @@ dependencies = [
  "deno_io",
  "filetime",
  "fs3",
+ "junction",
  "libc",
  "log",
  "nix 0.26.2",

Cargo.toml

@@ -194,6 +194,7 @@ nix = "=0.26.2"
 
 # windows deps
 fwdansi = "=1.1.0"
+junction = "=0.2.0"
 winapi = "=0.3.9"
 windows-sys = { version = "0.48.0", features = ["Win32_Media"] }
 winres = "=0.1.12"

cli/Cargo.toml

@@ -154,7 +154,7 @@ zstd.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 fwdansi.workspace = true
-junction = "=0.2.0"
+junction.workspace = true
 winapi = { workspace = true, features = ["knownfolders", "mswsock", "objbase", "shlobj", "tlhelp32", "winbase", "winerror", "winsock2"] }
 
 [target.'cfg(unix)'.dependencies]

ext/fs/Cargo.toml

@@ -35,3 +35,4 @@ nix.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 winapi = { workspace = true, features = ["winbase"] }
+junction.workspace = true

ext/fs/interface.rs

@@ -64,6 +64,8 @@ pub enum FsFileType {
   File,
   #[serde(rename = "dir")]
   Directory,
+  #[serde(rename = "junction")]
+  Junction,
 }
 
 #[derive(Serialize)]

ext/fs/std_fs.rs

@@ -810,6 +810,9 @@ fn symlink(
     FsFileType::Directory => {
       std::os::windows::fs::symlink_dir(oldpath, newpath)?;
     }
+    FsFileType::Junction => {
+      junction::create(oldpath, newpath)?;
+    }
   };
 
   Ok(())

ext/node/polyfills/_fs/_fs_symlink.ts

@@ -7,7 +7,7 @@ import { CallbackWithError } from "ext:deno_node/_fs/_fs_common.ts";
 import { pathFromURL } from "ext:deno_web/00_infra.js";
 import { promisify } from "ext:deno_node/internal/util.mjs";
 
-type SymlinkType = "file" | "dir";
+type SymlinkType = "file" | "dir" | "junction";
 
 export function symlink(
   target: string | URL,

tests/unit_node/_fs/_fs_symlink_test.ts

@@ -105,3 +105,20 @@ Deno.test({
     }
   },
 });
+
+Deno.test({
+  name: "SYNC: symlink junction",
+  fn() {
+    const dir: string = Deno.makeTempDirSync();
+    const linkedDir: string = dir + "-junction";
+
+    try {
+      symlinkSync(dir, linkedDir, "junction");
+      const stat = Deno.lstatSync(linkedDir);
+      assert(stat.isSymlink);
+    } finally {
+      Deno.removeSync(dir);
+      Deno.removeSync(linkedDir);
+    }
+  },
+});