Building a Streaming OpenAI Example in JavaScript, With Mocked Tests and Docs

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A developer added a streaming command to an OpenAI SDK practice project using JavaScript and the Responses API, so text appears in fragments as it arrives rather than after the full reply. The core function validates its inputs, enables streaming, and forwards only text-delta events to a callback that writes to the terminal. Tests use a mocked client to check fragment handling, ignored non-text events, input validation, and error propagation, with 19 passing and 0 failing. The author notes that no live API stream has been tested yet because no API key was available, so the tests only confirm behavior against simulated events. A cookbook document accompanies the project, covering setup, execution, troubleshooting, and what has and has not been verified.

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