API Specifications

Runtime Reference

Technical reference for compiler configurations, global runtime variables, and standard APIs supported by the DataVec JavaScript-to-C compilation layer.

Global Worker Interfaces

Name / Binding	Type	Description	Returns
fetch(request, env)	async function	The request entrypoint for a Worker. Receives the incoming request and bound environments.	Promise<Response>
scheduled(event, env)	async function	Cron-triggered entrypoint for recurring background work, on the same env bindings as fetch.	Promise<void>
env.DB	binding	Embedded SQLite via the Cloudflare-D1 API — prepare(sql).bind(...).first() / .all() / .run(). In-process, no per-request reconnect.	D1Database
env.SQL	binding	Managed database over the PostgreSQL wire protocol from an isolated sandbox, via named prepared statements — exec(name, binds) resolves to an array of row objects.	SqlClient
env.BUCKET	binding	S3/R2-compatible object storage (key → bytes) — get, put, list, and delete blobs from a Worker.	ObjectStore
env.CONVERSATION	binding	Live model-token streaming (the AI-gateway shape) — stream(url, prompt) resolves to a readable token stream.	TokenStream
crypto.subtle	global	Standard Web Crypto (SubtleCrypto) — digests, HMAC, AES-GCM/CTR/CBC, ECDSA, RSA, and Ed25519 — compiled to native code.	SubtleCrypto

Request Object Properties

Property	Type	Description
request.url	string	The full incoming HTTP request URL string.
request.method	string	HTTP request verb (GET, POST, PUT, DELETE, etc.).
request.headers	Headers	Map of HTTP request headers.
request.websocket	WebSocket	Incoming WebSocket stream connection instance for real-time bi-directional messaging.

Sample WebSocket & SQL Endpoint

Example endpoint streaming over a WebSocket and querying env.SQL by named prepared statement inside an isolated sandbox:

export default {
  async fetch(request, env) {
    if (request.headers.get('Upgrade') === 'websocket') {
      const [client, server] = new WebSocketPair();
      server.accept();
      server.addEventListener('message', async (event) => {
        // env.SQL.exec(statementName, binds) -> array of row objects
        const users = await env.SQL.exec('active_users', [event.data]);
        server.send(JSON.stringify(users));
      });
      return new Response(null, { status: 101, webSocket: client });
    }
    return new Response("Not a WebSocket connection", { status: 400 });
  }
};