Fix FilePathSource/FilePathTarget not working in server-side environments using CJS (closes #360)

scripts/bundle.ts

@@ -30,6 +30,7 @@ const createVariants = async (
  */`,
 		},
 		legalComments: 'none',
+		platform: 'node',
 	};
 
 	const umdConfig: esbuild.BuildOptions = {

src/node.ts

@@ -8,4 +8,5 @@
 
 // This file contains Node.js-specific code that does not run in a browser.
 
-export * as fs from 'node:fs/promises';
+// Dynamic import so it can be included in the bundles and still work properly in the browser
+export const getFs = () => import('node:fs/promises');

src/source.ts

@@ -959,7 +959,7 @@ export class FilePathSource extends PathedSource {
 			throw new TypeError('options.maxCacheSize, when provided, must be a non-negative number.');
 		}
 
-		if (!node.fs) {
+		if (!node.getFs) {
 			throw new Error(
 				'FilePathSource is only available in server-side environments (Node.js, Bun, Deno).',
 			);
@@ -970,7 +970,7 @@ export class FilePathSource extends PathedSource {
 		// Let's back this source with a StreamSource, makes the implementation very simple
 		this._streamSource = new StreamSource({
 			getSize: async () => {
-				this._fileHandle = await node.fs.open(filePath, 'r');
+				this._fileHandle = await (await node.getFs()).open(filePath, 'r');
 
 				const stats = await this._fileHandle.stat();
 				return stats.size;

src/target.ts

@@ -692,12 +692,18 @@ export class FilePathTarget extends Target {
 			throw new TypeError('options must be an object.');
 		}
 
+		if (!node.getFs) {
+			throw new Error(
+				'FilePathTarget is only available in server-side environments (Node.js, Bun, Deno).',
+			);
+		}
+
 		super();
 
 		// Let's back this target with a StreamTarget, makes the implementation very simple
 		const writable = new WritableStream<StreamTargetChunk>({
 			start: async () => {
-				this._fileHandle = await node.fs.open(filePath, 'w');
+				this._fileHandle = await (await node.getFs()).open(filePath, 'w');
 			},
 			write: async (chunk) => {
 				assert(this._fileHandle);