From c89e7429f74e6fe47d77e3b8482fcfb1e888e9f3 Mon Sep 17 00:00:00 2001
From: Vanilagy <1696106+Vanilagy@users.noreply.github.com>
Date: Mon, 27 Apr 2026 18:29:52 +0200
Subject: [PATCH] Fix FilePathSource/FilePathTarget not working in server-side
 environments using CJS (closes #360)

---
 scripts/bundle.ts | 1 +
 src/node.ts       | 3 ++-
 src/source.ts     | 4 ++--
 src/target.ts     | 8 +++++++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/scripts/bundle.ts b/scripts/bundle.ts
index 7dcc1ae..e5f9063 100644
--- a/scripts/bundle.ts
+++ b/scripts/bundle.ts
@@ -30,6 +30,7 @@ const createVariants = async (
  */`,
 		},
 		legalComments: 'none',
+		platform: 'node',
 	};
 
 	const umdConfig: esbuild.BuildOptions = {
diff --git a/src/node.ts b/src/node.ts
index 3ed1aa3..4718ebc 100644
--- a/src/node.ts
+++ b/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');
diff --git a/src/source.ts b/src/source.ts
index 7e2d298..553c8e6 100644
--- a/src/source.ts
+++ b/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;
diff --git a/src/target.ts b/src/target.ts
index 20a6aeb..ec44613 100644
--- a/src/target.ts
+++ b/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);