edgeone-makers-edge-functions

name	edgeone-makers-edge-functions
description	V8-based lightweight edge functions on EdgeOne Makers. Covers routing, KV storage access, request/response handling, and environment variables at the edge.
pathPatterns	["edge-functions/**","functions/**"]
validate	[{"pattern":"process\\.env","message":"Use context.env in EdgeOne Makers runtime code."},{"pattern":"new\\s+Headers\\s*\\(","message":"Use plain object headers for this runtime surface."},{"pattern":"fs\\.writeFile","message":"Edge Functions do not support filesystem writes."},{"pattern":"Response\\.json\\s*\\(","message":"Response.json() is not available in this V8 runtime — use new Response(JSON.stringify(data), { headers: { 'Content-Type': 'application/json' } })."}]
metadata	{"author":"edgeone","version":"1.0.0"}

Edge Functions

V8-based lightweight functions running at the edge. Ideal for simple APIs, KV storage access, and ultra-low latency responses.

Runtime: V8 (like Cloudflare Workers) — NOT Node.js. Do NOT use Node.js built-ins or npm packages.

⚠️ Response.json() is NOT available in this V8 runtime. Always use new Response(JSON.stringify(data), { headers: { 'Content-Type': 'application/json' } }) instead.

Basic function

File: edge-functions/api/hello.js

export default function onRequest(context) {
  return new Response('Hello from Edge Functions!');
}

Access: GET /api/hello

HTTP method handlers

// edge-functions/api/users.js

// Handle all methods
export function onRequest(context) {
  return new Response('Any method');
}

// Or use specific method handlers:
export function onRequestGet(context) {
  return new Response(JSON.stringify({ users: [] }), {
    headers: { 'Content-Type': 'application/json' },
  });
}

export async function onRequestPost(context) {
  const body = await context.request.json();
  return new Response(JSON.stringify({ created: true }), {
    status: 201,
    headers: { 'Content-Type': 'application/json' },
  });
}

EventContext object

export function onRequest(context) {
  const {
    request,    // Standard Request object
    params,     // Dynamic route params, e.g. { id: "123" }
    env,        // Environment variables from Makers console
    waitUntil,  // Extend function lifetime for async tasks
  } = context;

  // GEO info available via:
  const geo = context.request.eo;
  // geo.geo.countryName, geo.geo.cityName, geo.geo.latitude, etc.

  return new Response('OK');
}

Dynamic routes

// edge-functions/api/users/[id].js
// Matches: /api/users/123, /api/users/abc

export function onRequestGet(context) {
  const userId = context.params.id;
  return new Response(JSON.stringify({ userId }), {
    headers: { 'Content-Type': 'application/json' },
  });
}

// edge-functions/api/[[default]].js
// Catches all unmatched routes under /api/

export function onRequest(context) {
  return new Response('Catch-all route', { status: 404 });
}

KV Storage (Edge Functions only)

Cross-reference: if your code uses context.store or KV APIs, also read ../makers-storage/SKILL.md.

⚠️ Prerequisites: You must enable KV Storage in the EdgeOne Makers console, create a namespace, and bind it to your project before using KV. See ../makers-storage/references/kv.md for full setup instructions.

The KV namespace is a global variable (name is set when binding in the console) — it is NOT on context.env.

// edge-functions/api/counter.js

export async function onRequest(context) {
  // ⚠️ my_kv is a GLOBAL variable (name set when binding namespace in console)
  // Do NOT use context.env.KV ❌
  
  // Read
  const count = await my_kv.get('page_views') || '0';
  const newCount = parseInt(count) + 1;

  // Write
  await my_kv.put('page_views', String(newCount));

  return new Response(JSON.stringify({ views: newCount }), {
    headers: { 'Content-Type': 'application/json' },
  });
}

For full KV Storage API reference and usage guide, see: ../makers-storage/references/kv.md.

Supported Runtime APIs

Edge Functions run on V8 and support these Web Standard APIs:

• Fetch API — fetch() for outbound HTTP requests
• Cache API — caches.open(), cache.match(), cache.put()
• Headers / Request / Response — standard Web API objects
• Streams — ReadableStream, WritableStream, TransformStream
• Web Crypto — crypto.subtle for encryption/signing
• Encoding — TextEncoder, TextDecoder
• URL / URLSearchParams — URL parsing

⚠️ NOT available: Node.js built-ins (fs, path, http, crypto from Node), require(), npm packages.

Limits

Resource	Limit
Code package size	5 MB
Request body	1 MB
CPU time per invocation	200 ms
Language	JavaScript (ES2023+) only