feat(adapter-cloudflare): allow override esbuild option

.changeset/breezy-windows-shout.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare': minor
+---
+
+feat(adapter-cloudflare): allow override esbuild option

packages/adapter-cloudflare/index.d.ts

@@ -1,4 +1,5 @@
 import { Adapter } from '@sveltejs/kit';
+import type { BuildOptions } from 'esbuild';
 import './ambient.js';
 
 export default function plugin(options?: AdapterOptions): Adapter;
@@ -30,6 +31,15 @@ export interface AdapterOptions {
 		 */
 		exclude?: string[];
 	};
+
+	/**
+	 * Additional options to pass to esbuild when bundling `_worker.js` script.
+	 *
+	 * Documentation: https://esbuild.github.io/api/#build
+	 *
+	 * @default undefined
+	 */
+	esbuildOptions?: BuildOptions | ((ops: BuildOptions) => BuildOptions);
 }
 
 export interface RoutesJSONSpec {

packages/adapter-cloudflare/index.js

@@ -45,7 +45,8 @@ export default function (options = {}) {
 				}
 			});
 
-			await esbuild.build({
+			/** @type {import('esbuild').BuildOptions} */
+			let esbuildOps = {
 				platform: 'browser',
 				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
@@ -58,7 +59,14 @@ export default function (options = {}) {
 				loader: {
 					'.wasm': 'copy'
 				}
-			});
+			};
+
+			if (typeof options.esbuildOptions === 'object')
+				esbuildOps = { ...esbuildOps, ...options.esbuildOptions };
+			if (typeof options.esbuildOptions === 'function')
+				esbuildOps = options.esbuildOptions(esbuildOps);
+
+			await esbuild.build(esbuildOps);
 		}
 	};
 }