Stream worker output immediately via callbacks instead of buffering in arrays

[Copilot]

Changes to stream worker output immediately

• Understand current output accumulation pattern in all three workers
• Update WorkerAPI interface to accept output callback parameter
• Modify jsEval.worker.ts to send output immediately via callback
• Modify ruby.worker.ts to send output immediately via callback
• Modify pyodide.worker.ts to send output immediately via callback
• Update runtime.tsx to handle streaming output with callbacks
• Test the changes to ensure output is still displayed correctly
• Run linting and build to verify no breakage
• Address PR feedback:
  • Use optional chaining syntax in jsEval.worker.ts
  • Ruby worker now flushes complete lines immediately in stdout/stderr write
  • Move flushOutput() calls to finally blocks

Summary

All three worker files (jsEval.worker.ts, ruby.worker.ts, pyodide.worker.ts) have been successfully refactored to stream output immediately to the calling code via callbacks instead of accumulating output in arrays. This enables real-time output streaming and reduces memory usage.

Key Changes:

1. WorkerAPI Interface: Added onOutput callback parameter to runCode and runFile methods
2. Worker Files: Replaced output arrays with callback-based streaming using currentOutputCallback
3. Runtime Provider: Updated to use Comlink's proxy() to wrap callbacks and collect streamed output
4. Build Status: ✅ Build successful with no new errors or warnings

Improvements from PR feedback:

• jsEval.worker.ts: Simplified callback checks using optional chaining (?.())
• ruby.worker.ts: Lines with newlines are now flushed immediately in write() methods for real-time output
• ruby.worker.ts: flushOutput() moved to finally blocks to ensure proper cleanup

Original prompt

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This section details on the original issue you should resolve

<issue_title>jsEval.worker.ts, ruby.worker.ts, pyodide.worker.ts でoutputを配列にためるのではなく即座に呼び出し元に返す</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes jsEval.worker.ts, ruby.worker.ts, pyodide.worker.ts でoutputを配列にためるのではなく即座に呼び出し元に返す #144

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	my-code	ace27ff	Commit Preview URL Branch Preview URL	Dec 16 2025, 04:26 PM

[na-trium-144]

コールバックが良いのかReadableStreamが良いのか悩みどころ
一旦マージするのはあり

[na-trium-144]

@copilot currentOutputCallback?.(...) のほうが短いと思います。

[Copilot]

Changed to use optional chaining currentOutputCallback?.(...) for cleaner syntax in commit 9a08803.

[na-trium-144]

同様のコードがある箇所を全部指摘してあげないと指摘箇所しかやらないのかこいつは

[na-trium-144]

@copilot finally節を追加するならflushOutput();もfinallyに移動できます。
runFile()内についても同様

[Copilot]

Moved flushOutput() calls to finally blocks in both runCode() and runFile() functions in commit 9a08803.

[na-trium-144]

と思ったけど、エラーメッセージのあとにflushするのは違うな
あとでrevertする

[Copilot]

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