feat(std/node): add link/linkSync polyfill (#5930)

1 files changed, 37 insertions, 0 deletions

diff --git a/std/node/_fs/_fs_link.ts b/std/node/_fs/_fs_link.ts
new file mode 100644
index 000000000..50916a7ba
--- /dev/null
+++ b/std/node/_fs/_fs_link.ts
@@ -0,0 +1,37 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { CallbackWithError } from "./_fs_common.ts";
+import { fromFileUrl } from "../path.ts";
+
+/**
+ * TODO: Also accept 'path' parameter as a Node polyfill Buffer type once these
+ * are implemented. See https://github.com/denoland/deno/issues/3403
+ */
+export function link(
+  existingPath: string | URL,
+  newPath: string | URL,
+  callback: CallbackWithError
+): void {
+  existingPath =
+    existingPath instanceof URL ? fromFileUrl(existingPath) : existingPath;
+  newPath = newPath instanceof URL ? fromFileUrl(newPath) : newPath;
+
+  Deno.link(existingPath, newPath)
+    .then(() => callback())
+    .catch(callback);
+}
+
+/**
+ * TODO: Also accept 'path' parameter as a Node polyfill Buffer type once these
+ * are implemented. See https://github.com/denoland/deno/issues/3403
+ */
+export function linkSync(
+  existingPath: string | URL,
+  newPath: string | URL
+): void {
+  existingPath =
+    existingPath instanceof URL ? fromFileUrl(existingPath) : existingPath;
+  newPath = newPath instanceof URL ? fromFileUrl(newPath) : newPath;
+
+  Deno.linkSync(existingPath, newPath);
+}