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Malte UblandClaude Opus 5.5
507610b90d
Bundled npm code (from2, bl, tar-stream, yazl, multistream) builds its streams as ES5 constructor functions: util.inherits(Ctor, Readable) and Readable.call(this, opts), with _read/_write/_transform on the prototype. Readable.call(this) threw SC2020. A new runtime unit, scr_dyn_builtin_stream.c (feature dynBuiltinStream), gives the untyped stream constructors their stream half. Base.call(this, opts) creates a runtime stream over the receiver and keeps it in a hidden slot; the runtime calls the receiver's underscore methods through its property lookup; the stream prototypes carry Node's methods and accessors over the hidden stream; and EventEmitter's methods register listeners with the runtime stream's emitter, so runtime events and pipes reach JavaScript listeners with the receiver as this. _readableState/_writableState are live views. Stream class values now come from dyn.builtinStreamClass, so only programs that use them link the stream half. Typed code sees these objects as their runtime streams: checked casts to the stream classes take them, readable.pipe() into an untyped destination pipes into them, and runtime streams crossing into JavaScript answer the constructor object. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>