Unit 3 · Build a reliable AI-powered feature

Show typed results as they arrive

You can render typed deltas while the answer is still arriving. The final result remains governed by the same signature and assertions.

streamingForward()7 focused minutesNot started

Worked example

See the idea in context

for await (const chunk of program.streamingForward(llm, input)) { if (chunk.delta.answer) render(chunk.delta.answer); }

Open a typed stream
streamingForward() uses the same provider, input, and contract as forward().
Read only present fields
A chunk may contain an answer delta while other fields are still incomplete.
Render without reparsing
The UI consumes signature-aware deltas instead of scraping provider text.

Run itIn your own project

npm install @ax-llm/ax

import { ai, ax } from '@ax-llm/ax';

const llm = ai({ name: 'openai', apiKey: process.env.OPENAI_APIKEY! });
const classify = ax('review:string -> sentiment:class "positive, negative, neutral"');

const result = await classify.forward(llm, {
  review: 'Useful and boring in the best way.',
});

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- typescript src/examples/typescript/generation/axgen-openai.ts

Active practice

Show that you can use it

Answer 2 in a row to learn this · attempt 1

Keep exploring

See the idea in context

Show that you can use it

Source-backed follow-up