adapter-cloudflare-workers: Configure custom wrangler.toml file name

.changeset/eleven-seahorses-report.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare-workers': minor
+---
+
+Add config option to set custom `wrangler.toml` file name

packages/adapter-cloudflare-workers/README.md

@@ -69,6 +69,20 @@ Then, you can build your app and deploy it:
 wrangler publish
 ```
 
+## Custom config
+
+If you would like to use a config file other than `wrangler.toml`, you can do like so:
+
+```js
+import adapter from '@sveltejs/adapter-cloudflare-workers';
+
+export default {
+  kit: {
+    adapter: adapter({ config: '<your-wrangler-name>.toml' })
+  }
+};
+```
+
 ## Environment variables
 
 The [`env`](https://developers.cloudflare.com/workers/runtime-apis/fetch-event#parameters) object, containing KV/DO namespaces etc, is passed to SvelteKit via the `platform` property along with `context` and `caches`, meaning you can access it in hooks and endpoints:

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

@@ -1,3 +1,3 @@
 import { Adapter } from '@sveltejs/kit';
 
-export default function plugin(): Adapter;
+export default function plugin(options: { config?: string }): Adapter;

packages/adapter-cloudflare-workers/index.js

@@ -15,7 +15,7 @@ import { fileURLToPath } from 'url';
  */
 
 /** @type {import('.').default} */
-export default function () {
+export default function ({ config = 'wrangler.toml' } = {}) {
 	// TODO remove for 1.0
 	if (arguments.length > 0) {
 		throw new Error(
@@ -27,7 +27,7 @@ export default function () {
 		name: '@sveltejs/adapter-cloudflare-workers',
 
 		async adapt(builder) {
-			const { main, site } = validate_config(builder);
+			const { main, site } = validate_config(builder, config);
 
 			const files = fileURLToPath(new URL('./files', import.meta.url).href);
 			const tmp = builder.getBuildDirectory('cloudflare-workers-tmp');
@@ -81,31 +81,32 @@ export default function () {
 
 /**
  * @param {import('@sveltejs/kit').Builder} builder
+ * @param {string} config_file
  * @returns {WranglerConfig}
  */
-function validate_config(builder) {
-	if (existsSync('wrangler.toml')) {
+function validate_config(builder, config_file) {
+	if (existsSync(config_file)) {
 		/** @type {WranglerConfig} */
 		let wrangler_config;
 
 		try {
 			wrangler_config = /** @type {WranglerConfig} */ (
-				toml.parse(readFileSync('wrangler.toml', 'utf-8'))
+				toml.parse(readFileSync(config_file, 'utf-8'))
 			);
 		} catch (err) {
-			err.message = `Error parsing wrangler.toml: ${err.message}`;
+			err.message = `Error parsing ${config_file}: ${err.message}`;
 			throw err;
 		}
 
 		if (!wrangler_config.site?.bucket) {
 			throw new Error(
-				'You must specify site.bucket in wrangler.toml. Consult https://developers.cloudflare.com/workers/platform/sites/configuration'
+				`You must specify site.bucket in ${config_file}. Consult https://developers.cloudflare.com/workers/platform/sites/configuration`
 			);
 		}
 
 		if (!wrangler_config.main) {
 			throw new Error(
-				'You must specify main option in wrangler.toml. Consult https://github.com/sveltejs/kit/tree/master/packages/adapter-cloudflare-workers'
+				`You must specify main option in ${config_file}. Consult https://github.com/sveltejs/kit/tree/master/packages/adapter-cloudflare-workers`
 			);
 		}
 
@@ -134,5 +135,5 @@ function validate_config(builder) {
 			.trim()
 	);
 
-	throw new Error('Missing a wrangler.toml file');
+	throw new Error(`Missing a ${config_file} file`);
 }