feat: embed durableObjects exports into workers script

Author: Karakatiza666

packages/adapter-cloudflare-workers/files/entry.js

@@ -1,5 +1,6 @@
 import { Server } from 'SERVER';
 import { manifest, prerendered } from 'MANIFEST';
+DURABLE_OBJECT_EXPORTS;
 import { getAssetFromKV, mapRequestToAsset } from '@cloudflare/kv-asset-handler';
 import static_asset_manifest_json from '__STATIC_CONTENT_MANIFEST';
 const static_asset_manifest = JSON.parse(static_asset_manifest_json);

packages/adapter-cloudflare-workers/index.d.ts

@@ -1,4 +1,11 @@
 import { Adapter } from '@sveltejs/kit';
 import './ambient.js';
 
-export default function plugin(options: { config?: string }): Adapter;
+export default function plugin(options: {
+   config?: string
+	/**
+	 * Customize the file that exports DurableObject classes definitions
+	 * @default "./src/lib/durableObjects.js"
+	 */
+	durableObjectExports?: string
+}): Adapter;

packages/adapter-cloudflare-workers/index.js

@@ -15,7 +15,7 @@ import { fileURLToPath } from 'node:url';
  */
 
 /** @type {import('.').default} */
-export default function ({ config = 'wrangler.toml' } = {}) {
+export default function ({ config = 'wrangler.toml', ...options } = {}) {
 	return {
 		name: '@sveltejs/adapter-cloudflare-workers',
 
@@ -38,10 +38,20 @@ export default function ({ config = 'wrangler.toml' } = {}) {
 			builder.log.minor('Generating worker...');
 			const relativePath = posix.relative(tmp, builder.getServerDirectory());
 
+			let durable_objects_exports = ''
+			try {
+				readFileSync(options.durableObjectExports ?? './src/lib/durableObjects.js')
+			} catch {
+				if (options.durableObjectExports) {
+					throw new Error('Specified durableObjectExports file not found');
+				}
+			}
+
 			builder.copy(`${files}/entry.js`, `${tmp}/entry.js`, {
 				replace: {
 					SERVER: `${relativePath}/index.js`,
-					MANIFEST: './manifest.js'
+					MANIFEST: './manifest.js',
+					DURABLE_OBJECT_EXPORTS: durable_objects_exports
 				}
 			});
 

packages/adapter-cloudflare/index.d.ts

@@ -30,6 +30,11 @@ export interface AdapterOptions {
 		 */
 		exclude?: string[];
 	};
+	/**
+	 * Customize the file that exports DurableObject classes definitions
+	 * @default "./src/lib/durableObjects.js"
+	 */
+	durableObjectExports?: string
 }
 
 export interface RoutesJSONSpec {

packages/adapter-cloudflare/index.js

@@ -1,4 +1,4 @@
-import { writeFileSync } from 'node:fs';
+import { readFileSync, writeFileSync } from 'node:fs';
 import * as path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import * as esbuild from 'esbuild';
@@ -38,10 +38,20 @@ export default function (options = {}) {
 
 			writeFileSync(`${dest}/_headers`, generate_headers(builder.config.kit.appDir), { flag: 'a' });
 
+			let durable_objects_exports = ''
+			try {
+				readFileSync(options.durableObjectExports ?? './src/lib/durableObjects.js')
+			} catch {
+				if (options.durableObjectExports) {
+					throw new Error('Specified durableObjectExports file not found');
+				}
+			}
+
 			builder.copy(`${files}/worker.js`, `${tmp}/_worker.js`, {
 				replace: {
 					SERVER: `${relativePath}/index.js`,
-					MANIFEST: './manifest.js'
+					MANIFEST: './manifest.js',
+					DURABLE_OBJECT_EXPORTS: durable_objects_exports
 				}
 			});
 

packages/adapter-cloudflare/src/worker.js

@@ -1,5 +1,6 @@
 import { Server } from 'SERVER';
 import { manifest, prerendered } from 'MANIFEST';
+DURABLE_OBJECT_EXPORTS;
 import * as Cache from 'worktop/cfw.cache';
 
 const server = new Server(manifest);