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Malte UblandClaude Opus 5.5
0cf62ebecf
Reading an EventEmitter.prototype method off a compiled emitter (a program class extending EventEmitter, or new EventEmitter()) through an untyped value answered undefined (`typeof o.on`, `const f = o.on; f.call(o, ...)`, `o.emit.bind(o)`), and EventEmitter.prototype.on in JavaScript was a fence. Such reads, typed value reads, computed keys, `in`, and EventEmitter.prototype.<method> now answer the runtime's EventEmitter.prototype functions, the ones constructor-function emitters inherit, so `o.on === o.addListener === EventEmitter.prototype.on` and names and lengths match Node. The first read installs a program dispatch that those functions call for a compiled emitter receiver; it invokes the method through the existing untyped dispatch with the call's argument count (emit forwards up to 16 arguments after the name, then fences). An untyped emit on, or read of emit from, a class that overrides emit now fences instead of bypassing the override for the native emit. A subclass visited under the boxed EventEmitter capsule keeps its own dispatch plan for values boxed as itself. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>