Eventport

Lightweight, typed conversion between AI protocols. Works on the server and in the browser, with zero runtime dependencies.

pnpm add eventport

import { eventport } from "eventport";
import { responses } from "eventport/openai";
import { agUI } from "eventport/agui";

const converter = eventport
  .from(responses())
  .to(agUI({ threadId, runId }));

return converter.convert(upstream).toResponse();

Use the same API for live streams and stored event arrays. Return an SSE response with .toResponse(), collect events with .collect(), or iterate with for await.

Adapters

Adapters translate through AG-UI internally. Provider details use namespaced CUSTOM events and metadata; unsupported mappings follow .onUnsupported().

Import	Adapters
eventport/openai	chatCompletions(), responses()
eventport/anthropic	anthropic()
eventport/agui	agUI({ threadId, runId })
eventport/vercel	aiSDK()
eventport/langgraph	langGraph() — source only

aiSDK() uses the UI message stream. See adapter coverage for supported events and limits.

Customize

Modify native events with typed middleware:

const converter = eventport
  .from(responses())
  .middleware({
    "response.output_text.delta": event => ({
      ...event,
      delta: event.delta.toUpperCase(),
    }),
  })
  .to(agUI({ threadId, runId }));

Replace a conversion with an override:

const custom = converter.overrides({
  "response.output_text.delta": event => ({
    type: "CUSTOM",
    name: "text.fragment",
    value: { text: event.delta },
  }),
});

Return eventport.DEFAULT to keep the default mapping, or null to suppress its output. Keep destination start/end events consistent.

Documentation · API reference · Assistant-ui example

Development

Requires Node.js 22+ and pnpm 10.34.3.

pnpm install
pnpm check
pnpm test
pnpm build

• pnpm docs:dev — docs at http://127.0.0.1:4322.
• pnpm dev — chat app at http://127.0.0.1:4321. Configure API keys using the example setup.
• pnpm example — terminal conversion example.

See release instructions for npm publishing.

MIT © 2026 AbhinRustagi.