[RaxRai]

Fixes #37150

isDisturbed / Readable.isDisturbed, isErrored and isReadable from node:stream read Symbol.for("nodejs.stream.disturbed"), "nodejs.stream.errored" and "nodejs.stream.readable" from the stream (ext/node/polyfills/internal/streams/utils.js). Node's web ReadableStream defines getters for these keys (lib/internal/webstreams/readablestream.js), but Deno's didn't, so for a web stream the helpers returned false, false and null whatever its state.

This adds the three getters to ReadableStream in ext/web/06_streams.js, reading the state the stream already tracks:

• disturbed → [_disturbed]
• errored → [_state] === "errored"
• readable → [_state] === "readable"

These match Node's definitions. The keys are symbols, so webidl.configureInterface leaves them non-enumerable.

With the issue's repro, the output now matches Node.js:

fresh   false false true
read    true false false
errored false true false
cancel  true

Tests

Added isDisturbed, isErrored and isReadable on web streams to tests/unit_node/stream_test.ts. It covers a fresh stream, a stream after a read, an errored stream and a cancelled stream.

AI disclosure

I used an AI assistant (Claude) to help investigate the issue and draft this change. I reviewed and tested it.