feat(ext/node): embed std/node into the snapshot (#17724)

This commit moves "deno_std/node" in "ext/node" crate. The code is
transpiled and snapshotted during the build process.

During the first pass a minimal amount of work was done to create the
snapshot, a lot of code in "ext/node" depends on presence of "Deno"
global. This code will be gradually fixed in the follow up PRs to migrate
it to import relevant APIs from "internal:" modules.

Currently the code from snapshot is not used in any way, and all
Node/npm compatibility still uses code from 
"https://deno.land/std/node" (or from the location specified by 
"DENO_NODE_COMPAT_URL"). This will also be handled in a follow 
up PRs.

---------

Co-authored-by: crowlkats <crowlkats@toaxl.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/ext/node/polyfills/internal/normalize_encoding.mjs b/ext/node/polyfills/internal/normalize_encoding.mjs
new file mode 100644
index 000000000..788c86c56
--- /dev/null
+++ b/ext/node/polyfills/internal/normalize_encoding.mjs
@@ -0,0 +1,72 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+export function normalizeEncoding(enc) {
+  if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";
+  return slowCases(enc);
+}
+
+export function slowCases(enc) {
+  switch (enc.length) {
+    case 4:
+      if (enc === "UTF8") return "utf8";
+      if (enc === "ucs2" || enc === "UCS2") return "utf16le";
+      enc = `${enc}`.toLowerCase();
+      if (enc === "utf8") return "utf8";
+      if (enc === "ucs2") return "utf16le";
+      break;
+    case 3:
+      if (
+        enc === "hex" || enc === "HEX" ||
+        `${enc}`.toLowerCase() === "hex"
+      ) {
+        return "hex";
+      }
+      break;
+    case 5:
+      if (enc === "ascii") return "ascii";
+      if (enc === "ucs-2") return "utf16le";
+      if (enc === "UTF-8") return "utf8";
+      if (enc === "ASCII") return "ascii";
+      if (enc === "UCS-2") return "utf16le";
+      enc = `${enc}`.toLowerCase();
+      if (enc === "utf-8") return "utf8";
+      if (enc === "ascii") return "ascii";
+      if (enc === "ucs-2") return "utf16le";
+      break;
+    case 6:
+      if (enc === "base64") return "base64";
+      if (enc === "latin1" || enc === "binary") return "latin1";
+      if (enc === "BASE64") return "base64";
+      if (enc === "LATIN1" || enc === "BINARY") return "latin1";
+      enc = `${enc}`.toLowerCase();
+      if (enc === "base64") return "base64";
+      if (enc === "latin1" || enc === "binary") return "latin1";
+      break;
+    case 7:
+      if (
+        enc === "utf16le" || enc === "UTF16LE" ||
+        `${enc}`.toLowerCase() === "utf16le"
+      ) {
+        return "utf16le";
+      }
+      break;
+    case 8:
+      if (
+        enc === "utf-16le" || enc === "UTF-16LE" ||
+        `${enc}`.toLowerCase() === "utf-16le"
+      ) {
+        return "utf16le";
+      }
+      break;
+    case 9:
+      if (
+        enc === "base64url" || enc === "BASE64URL" ||
+        `${enc}`.toLowerCase() === "base64url"
+      ) {
+        return "base64url";
+      }
+      break;
+    default:
+      if (enc === "") return "utf8";
+  }
+}