adapter-netlify

npm install -D @sveltejs/adapter-netlify

/// file: svelte.config.js
import adapter from '@sveltejs/adapter-netlify';

/** @type {import('@sveltejs/kit').Config} */
const config = {
  kit: {
    adapter: adapter({
      edge: false,
      split: false
    })
  }
};

export default config;

/// file: packages/adapter-netlify/index.d.ts
export default function plugin(opts?: { 
  split?: boolean;   // Split into multiple functions
  edge?: boolean;    // Use Netlify Edge Functions
}): Adapter;

adapter({
  split: true  // One function per route
})

/// file: packages/adapter-netlify/index.js
if (split) {
  for (let i = 0; i < builder.routes.length; i++) {
    const route = builder.routes[i];
    if (route.prerender === true) continue;
    
    const parts = [];
    for (const segment of route.segments) {
      if (segment.rest) {
        parts.push('*');
      } else if (segment.dynamic) {
        parts.push(`:param${parts.length}`);
      } else {
        parts.push(segment.content);
      }
    }
    
    const pattern = `/${parts.join('/')}`;
    const name = FUNCTION_PREFIX + 
      (parts.join('-').replace(/[:.]/g, '_').replace('*', '__rest') || 'index');
    
    generate_serverless_function({ builder, routes, patterns, name });
  }
}

adapter({
  edge: true  // Use edge runtime
})

[build]
  command = "npm run build"
  publish = "build"

[build.environment]
  NODE_VERSION = "20"

[[redirects]]
  from = "/old-path"
  to = "/new-path"
  status = 301

/// file: packages/adapter-netlify/index.js
function get_publish_directory(netlify_config, builder) {
  if (netlify_config) {
    if (!netlify_config.build?.publish) {
      builder.log.minor('No publish directory specified in netlify.toml, using default');
      return;
    }
    
    if (resolve(netlify_config.build.publish) === process.cwd()) {
      throw new Error(
        'The publish directory cannot be set to the site root. ' +
        'Please change it to another value such as "build" in netlify.toml.'
      );
    }
    return netlify_config.build.publish;
  }
}

/// file: packages/adapter-netlify/index.js
builder.log.minor('Writing custom headers...');
const headers_file = join(publish, '_headers');
builder.copy('_headers', headers_file);
appendFileSync(
  headers_file,
  `\n\n/${builder.getAppPath()}/immutable/*\n  cache-control: public\n  cache-control: immutable\n  cache-control: max-age=31536000\n`
);

/// file: src/hooks.server.js
/** @type {import('@sveltejs/kit').Handle} */
export async function handle({ event, resolve }) {
  // Access Netlify context (when using Edge Functions)
  console.log('Deploy ID:', event.platform?.context?.deploy?.id);
  console.log('Geo location:', event.platform?.context?.geo);
  
  return resolve(event);
}

[build.environment]
  DATABASE_URL = "postgresql://..."
  API_KEY = "secret-key"

[context.production.environment]
  NODE_ENV = "production"

[context.deploy-preview.environment]
  NODE_ENV = "staging"

import { env } from '$env/dynamic/private';

export async function load() {
  const data = await fetch(env.DATABASE_URL);
  // ...
}