feat: update to newer spec

[ExE-Boss]

Part of #181

Features

• Added support for new Realm() and subclassing.
• Added Realm.prototype.globalThis.
• Changed Realm.makeRootRealm() to call new Realm().

Deprecations

• Realm.makeRootRealm()
  • Replaced with new Realm().
• Realm.makeCompartment()
  • Replaced with the Compartments Proposal.
• get Realm.prototype.global
  • Converted to an alias of Realm.prototype.globalThis:

     assert(
     	Object.is(
     		Realm.prototype.__lookupGetter__('global'),
     		Realm.prototype.__lookupGetter__('globalThis'),
     	),
     );

---

• Realm.prototype.evaluate(…) (soft deprecation)
  • Deferred to the Compartments Proposal.

To do (in future PRs):

• Implement Realm.prototype.import(…).

[Jack-Works]

Cool! Will there be a Compartment polyfill?

[ExE-Boss]

Will there be a Compartment polyfill?

That depends on the Compartments Proposal having an actual specification text, instead of just having an explainer.

[Hental]

now renamed to ShadowRealm

see https://github.com/tc39/proposal-shadowrealm