vm: introduce vanilla contexts via vm.constants.DONT_CONTEXTIFY

[joyeecheung]

vm: introduce vanilla contexts via vm.constants.DONT_CONTEXTIFY

Text for releasers:

new option for vm.createContext() to create a context with a freezable globalThis

This implements a flavor of vm.createContext() and friends that creates a context without contextifying its global object when vm.constants.DONT_CONTEXTIFY is used.
This is suitable when users want to freeze the context (impossible when the global is contextified i.e. has interceptors installed) or speed up the global access if they don't need the interceptor behavior.

const vm = require('node:vm');

{
  const oldContext = vm.createContext();
  console.log(vm.runInContext('globalThis', context) === oldContext);  // false
  console.log(oldContext.Array);  // undefined

  // In contextified contexts, freezing doesn't work
  try {
    vm.runInContext('Object.freeze(globalThis);', oldContext);
  } catch {
    // TypeError: Cannot freeze
  }
  console.log(vm.runInContext('globalThis.foo = 1; foo;', oldContext));  // 1
}

{
  const newContext = vm.createContext(vm.constants.DONT_CONTEXTIFY);
  console.log(vm.runInContext('globalThis', newContext) === newContext);  // true
  console.log(newContext.Array);  // [Function: Array]

  // In contexts without its global contextifyed, freezing works and prevents scripts from
  // accidentally leaking globals.
  vm.runInContext('Object.freeze(globalThis);', newContext);
  try {
    vm.runInContext('globalThis.foo = 1; foo;', newContext);
  } catch(e) {
    console.log(e); // Uncaught ReferenceError: foo is not defined
  }
}

[github-actions]

The notable-change PRs with changes that should be highlighted in changelogs. label has been added by @joyeecheung.

Please suggest a text for the release notes if you'd like to include a more detailed summary, then proceed to update the PR description with the text or a link to the notable change suggested text comment. Otherwise, the commit will be placed in the Other Notable Changes section.

[codecov]

Codecov Report

Attention: Patch coverage is 82.14286% with 10 lines in your changes missing coverage. Please review.

Project coverage is 87.33%. Comparing base (9edf4a0) to head (d43c426).
Report is 62 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_contextify.cc	80.43%	1 Missing and 8 partials ⚠️
src/node_contextify.h	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #54394   +/-   ##
=======================================
  Coverage   87.32%   87.33%           
=======================================
  Files         649      649           
  Lines      182603   182590   -13     
  Branches    35042    35039    -3     
=======================================
+ Hits       159464   159470    +6     
+ Misses      16400    16391    -9     
+ Partials     6739     6729   -10     

Files with missing lines	Coverage Δ
lib/vm.js	99.28% <100.00%> (+<0.01%)	⬆️
src/node_contextify.h	82.35% <75.00%> (-3.37%)	⬇️
src/node_contextify.cc	80.84% <80.43%> (+0.21%)	⬆️

... and 46 files with indirect coverage changes

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/61242/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/61343/

[legendecas]

Overall LGTM. Thanks!

[legendecas]

Not really relevant to this PR but I think we should not automatically create an own @@ToStringTag property on the global object: #54522.