feat(ext/node): properly segregate node globals (#19307)

Code run within Deno-mode and Node-mode should have access to a
slightly different set of globals. Previously this was done through a
compile time code-transform for Node-mode, but this is not ideal and has
many edge cases, for example Node's globalThis having a different
identity than Deno's globalThis.

This commit makes the `globalThis` of the entire runtime a semi-proxy.
This proxy returns a different set of globals depending on the caller's
mode. This is not a full proxy, because it is shadowed by "real"
properties on globalThis. This is done to avoid the overhead of a full
proxy for all globalThis operations.

The globals between Deno-mode and Node-mode are now properly segregated.
This means that code running in Deno-mode will not have access to Node's
globals, and vice versa. Deleting a managed global in Deno-mode will
NOT delete the corresponding global in Node-mode, and vice versa.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: Aapo Alasuutari <aapo.alasuutari@gmail.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/cli/tests/node_compat/polyfill_globals.js b/cli/tests/node_compat/polyfill_globals.js
new file mode 100644
index 000000000..493cec87a
--- /dev/null
+++ b/cli/tests/node_compat/polyfill_globals.js
@@ -0,0 +1,25 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import process from "node:process";
+import { Buffer } from "node:buffer";
+import {
+  clearImmediate,
+  clearInterval,
+  clearTimeout,
+  setImmediate,
+  setInterval,
+  setTimeout,
+} from "node:timers";
+import { performance } from "node:perf_hooks";
+import console from "node:console";
+globalThis.Buffer = Buffer;
+globalThis.clearImmediate = clearImmediate;
+globalThis.clearInterval = clearInterval;
+globalThis.clearTimeout = clearTimeout;
+globalThis.console = console;
+globalThis.global = globalThis;
+globalThis.performance = performance;
+globalThis.process = process;
+globalThis.setImmediate = setImmediate;
+globalThis.setInterval = setInterval;
+globalThis.setTimeout = setTimeout;
+delete globalThis.window;
diff --git a/cli/tests/node_compat/runner.ts b/cli/tests/node_compat/runner.ts
index f12cc69b0..93fca6548 100644
--- a/cli/tests/node_compat/runner.ts
+++ b/cli/tests/node_compat/runner.ts
@@ -1,4 +1,5 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import "./polyfill_globals.js";
 import { createRequire } from "node:module";
 const file = Deno.args[0];
 if (!file) {