fix(ext/node): basic vm.runInNewContext implementation (#21527)

Simple implementation to support webpack (& Next.js):
8766092180/lib/javascript/JavascriptParser.js (L4329)

cli/tests/integration/node_unit_tests.rs

@@ -82,6 +82,7 @@ util::unit_test_factory!(
     tty_test,
     util_test,
     v8_test,
+    vm_test,
     worker_threads_test,
     zlib_test
   ]

cli/tests/unit_node/vm_test.ts

@@ -0,0 +1,57 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { runInNewContext } from "node:vm";
+import {
+  assertEquals,
+  assertThrows,
+} from "../../../test_util/std/assert/mod.ts";
+
+Deno.test({
+  name: "vm runInNewContext",
+  fn() {
+    const two = runInNewContext("1 + 1");
+    assertEquals(two, 2);
+  },
+});
+
+Deno.test({
+  name: "vm runInNewContext sandbox",
+  fn() {
+    assertThrows(() => runInNewContext("Deno"));
+    // deno-lint-ignore no-var
+    var a = 1;
+    assertThrows(() => runInNewContext("a + 1"));
+
+    runInNewContext("a = 2");
+    assertEquals(a, 1);
+  },
+});
+
+// https://github.com/webpack/webpack/blob/87660921808566ef3b8796f8df61bd79fc026108/lib/javascript/JavascriptParser.js#L4329
+Deno.test({
+  name: "vm runInNewContext webpack magic comments",
+  fn() {
+    const webpackCommentRegExp = new RegExp(
+      /(^|\W)webpack[A-Z]{1,}[A-Za-z]{1,}:/,
+    );
+    const comments = [
+      'webpackChunkName: "test"',
+      'webpackMode: "lazy"',
+      "webpackPrefetch: true",
+      "webpackPreload: true",
+      "webpackProvidedExports: true",
+      'webpackChunkLoading: "require"',
+      'webpackExports: ["default", "named"]',
+    ];
+
+    for (const comment of comments) {
+      const result = webpackCommentRegExp.test(comment);
+      assertEquals(result, true);
+
+      const [[key, _value]]: [string, string][] = Object.entries(
+        runInNewContext(`(function(){return {${comment}};})()`),
+      );
+      const expectedKey = comment.split(":")[0].trim();
+      assertEquals(key, expectedKey);
+    }
+  },
+});

ext/node/lib.rs

@@ -30,6 +30,7 @@ mod path;
 mod polyfill;
 mod resolution;
 
+pub use ops::v8::VM_CONTEXT_INDEX;
 pub use package_json::PackageJson;
 pub use path::PathClean;
 pub use polyfill::is_builtin_node_module;
@@ -243,6 +244,7 @@ deno_core::extension!(deno_node,
     ops::winerror::op_node_sys_to_uv_error,
     ops::v8::op_v8_cached_data_version_tag,
     ops::v8::op_v8_get_heap_statistics,
+    ops::v8::op_vm_run_in_new_context,
     ops::idna::op_node_idna_domain_to_ascii,
     ops::idna::op_node_idna_domain_to_unicode,
     ops::idna::op_node_idna_punycode_decode,

ext/node/ops/v8.rs

@@ -1,4 +1,5 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+use deno_core::error::AnyError;
 use deno_core::op2;
 use deno_core::v8;
 
@@ -30,3 +31,50 @@ pub fn op_v8_get_heap_statistics(
   buffer[12] = stats.used_global_handles_size() as f64;
   buffer[13] = stats.external_memory() as f64;
 }
+
+pub const VM_CONTEXT_INDEX: usize = 0;
+
+fn make_context<'a>(
+  scope: &mut v8::HandleScope<'a>,
+) -> v8::Local<'a, v8::Context> {
+  let scope = &mut v8::EscapableHandleScope::new(scope);
+  let context = v8::Context::from_snapshot(scope, VM_CONTEXT_INDEX).unwrap();
+  scope.escape(context)
+}
+
+#[op2]
+pub fn op_vm_run_in_new_context<'a>(
+  scope: &mut v8::HandleScope<'a>,
+  script: v8::Local<v8::String>,
+  ctx_val: v8::Local<v8::Value>,
+) -> Result<v8::Local<'a, v8::Value>, AnyError> {
+  let _ctx_obj = if ctx_val.is_undefined() || ctx_val.is_null() {
+    v8::Object::new(scope)
+  } else {
+    ctx_val.try_into()?
+  };
+
+  let ctx = make_context(scope);
+
+  let scope = &mut v8::ContextScope::new(scope, ctx);
+
+  let tc_scope = &mut v8::TryCatch::new(scope);
+  let script = match v8::Script::compile(tc_scope, script, None) {
+    Some(s) => s,
+    None => {
+      assert!(tc_scope.has_caught());
+      tc_scope.rethrow();
+      return Ok(v8::undefined(tc_scope).into());
+    }
+  };
+
+  Ok(match script.run(tc_scope) {
+    Some(result) => result,
+    None => {
+      assert!(tc_scope.has_caught());
+      tc_scope.rethrow();
+
+      v8::undefined(tc_scope).into()
+    }
+  })
+}

ext/node/polyfills/vm.ts

@@ -6,6 +6,7 @@
 import { notImplemented } from "ext:deno_node/_utils.ts";
 
 const { core } = globalThis.__bootstrap;
+const ops = core.ops;
 
 export class Script {
   code: string;
@@ -25,8 +26,13 @@ export class Script {
     notImplemented("Script.prototype.runInContext");
   }
 
-  runInNewContext(_contextObject: any, _options: any) {
-    notImplemented("Script.prototype.runInNewContext");
+  runInNewContext(contextObject: any, options: any) {
+    if (options) {
+      console.warn(
+        "Script.runInNewContext options are currently not supported",
+      );
+    }
+    return ops.op_vm_run_in_new_context(this.code, contextObject);
   }
 
   createCachedData() {
@@ -51,11 +57,14 @@ export function runInContext(
 }
 
 export function runInNewContext(
-  _code: string,
-  _contextObject: any,
-  _options: any,
+  code: string,
+  contextObject: any,
+  options: any,
 ) {
-  notImplemented("runInNewContext");
+  if (options) {
+    console.warn("vm.runInNewContext options are currently not supported");
+  }
+  return ops.op_vm_run_in_new_context(code, contextObject);
 }
 
 export function runInThisContext(

runtime/snapshot.rs

@@ -7,6 +7,7 @@ use crate::shared::runtime;
 use deno_cache::SqliteBackedCache;
 use deno_core::error::AnyError;
 use deno_core::snapshot_util::*;
+use deno_core::v8;
 use deno_core::Extension;
 use deno_http::DefaultHttpPropertyExtractor;
 use std::path::Path;
@@ -261,7 +262,13 @@ pub fn create_runtime_snapshot(
     startup_snapshot: None,
     extensions,
     compression_cb: None,
-    with_runtime_cb: None,
+    with_runtime_cb: Some(Box::new(|rt| {
+      let isolate = rt.v8_isolate();
+      let scope = &mut v8::HandleScope::new(isolate);
+
+      let ctx = v8::Context::new(scope);
+      assert_eq!(scope.add_context(ctx), deno_node::VM_CONTEXT_INDEX);
+    })),
     skip_op_registration: false,
   });
   for path in output.files_loaded_during_snapshot {