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```typescript
// AI Dev Tool: Cloudflare Worker Hono API Template
// =============================================
// A production-ready starter boilerplate for building serverless APIs with Cloudflare Workers and Hono.

// Import required dependencies
import { Hono } from 'hono';
import { Router } from 'hono/router';
import { env } from 'env';
import { SupabaseClient } from '@supabase/supabase-js';

// Define the API router
const router = new Router();

// Initialize the Supabase client
const supabaseUrl = env('SUPABASE_URL');
const supabaseKey = env('SUPABASE_KEY');
const supabase = new SupabaseClient(supabaseUrl, supabaseKey);

// Define a route for handling GET requests
router.get('/api/data', async (c) => {
  try {
    // Fetch data from Supabase
    const { data, error } = await supabase.from('data').select('*');
    if (error) {
      // Handle errors
      return c.json({ error: 'Failed to fetch data' }, 500);
    }
    // Return the fetched data
    return c.json(data);
  } catch (error) {
    // Handle unexpected errors
    return c

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