Use rsbuild inline sourcemaps for JupyterLab extension (#909)

Author: manzt

.changeset/khaki-houses-poke.md

@@ -0,0 +1,14 @@
+---
+"anywidget": patch
+---
+
+Use rsbuild inline sourcemaps for JupyterLab extension
+
+JupyterLab was refusing to load external source map files because they were
+being served with the wrong MIME type ('application/octet-stream' instead of
+the expected source map MIME type). This caused the extension to fail loading
+in version 0.9.20.
+
+Switching to inline source maps embeds the source map directly in the
+JavaScript bundle, avoiding the MIME type issue while still providing source
+map support for debugging.

packages/anywidget/scripts/jlab.config.cjs

@@ -12,7 +12,7 @@ fs.rmSync(out, { recursive: true, force: true });
 module.exports = {
 	mode: "production",
 	optimization: { minimize: false },
-	devtool: "source-map",
+	devtool: "inline-source-map",
 	entry: path.resolve(root, "src/index.js"),
 	output: {
 		filename: "[name].[contenthash:8].js",