Add improved logic for loading Node.js module (fixes #118)

package.json

@@ -22,6 +22,10 @@
     "dist",
     "src"
   ],
+  "browser": {
+    "./dist/modules/src/node.js": false,
+		"./src/node.ts": false
+  },
   "sideEffects": false,
   "scripts": {
     "build": "./build.sh",

scripts/add-import-extensions.ts

@@ -24,7 +24,7 @@ const walkDir = (dir: string) => {
 const fixFile = (filePath: string) => {
 	const content = fs.readFileSync(filePath, 'utf8');
 	const fixed = content.replace(
-		/(\s+from\s+['"])([^'"]*)(['"])/g,
+		/(\s+from\s+['"])(\.[^'"]*)(['"])/g, // This only matches relative imports
 		'$1$2.js$3',
 	);
 

scripts/bundle.ts

@@ -16,6 +16,9 @@ const createVariants = async (
 		entryPoints: [entryPoint],
 		bundle: true,
 		logLevel: 'info',
+		logOverride: {
+			'import-is-undefined': 'silent', // Warning caused by the disabled "node.ts" import
+		},
 		banner: {
 			js: `/*!
  * Copyright (c) 2025-present, Vanilagy and contributors

src/node.ts

@@ -0,0 +1,11 @@
+/*!
+ * Copyright (c) 2025-present, Vanilagy and contributors
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+// This file contains Node.js-specific code that does not run in a browser.
+
+export * as fs from 'node:fs/promises';

src/source.ts

@@ -18,6 +18,9 @@ import {
 	toDataView,
 	toUint8Array,
 } from './misc';
+import * as nodeAlias from './node';
+
+const node = nodeAlias; // Aliasing it prevents some bundler warnings
 
 export type ReadResult = {
 	bytes: Uint8Array;
@@ -548,9 +551,7 @@ export class FilePathSource extends Source {
 		// Let's back this source with a StreamSource, makes the implementation very simple
 		this._streamSource = new StreamSource({
 			getSize: async () => {
-				const FS_MODULE_NAME = 'node:fs/promises';
+				fileHandle = await node.fs.open(filePath, 'r');
-				const fs = await import(/* @vite-ignore */ FS_MODULE_NAME) as typeof import('node:fs/promises');
-				fileHandle = await fs.open(filePath, 'r');
 
 				const stats = await fileHandle.stat();
 				return stats.size;
@@ -558,8 +559,9 @@ export class FilePathSource extends Source {
 			read: async (start, end) => {
 				assert(fileHandle);
 
-				const buffer = Buffer.alloc(end - start);
+				const buffer = new Uint8Array(end - start);
 				await fileHandle.read(buffer, 0, end - start, start);
+
 				return buffer;
 			},
 			maxCacheSize: options.maxCacheSize,