fix: source maps to work correctly

package.json

@@ -41,9 +41,9 @@
 		"webpack": "4 || 5"
 	},
 	"dependencies": {
+		"@cspotcode/source-map-support": "^0.8.1",
 		"fs-require": "^1.6.0",
 		"memfs": "^3.5.0",
-		"source-map-support": "^0.5.21",
 		"yargs": "^16.2.0"
 	},
 	"devDependencies": {

src/lib/memfs.ts

@@ -1,24 +1,36 @@
 import path from 'path';
 import { createFsFromVolume, Volume } from 'memfs';
 import { createFsRequire } from 'fs-require';
-import sourceMapSupport from 'source-map-support';
+import sourceMapSupport from '@cspotcode/source-map-support';
 
 export const mfs = createFsFromVolume(new Volume());
 
 // @ts-expect-error To support Webpack 4. No longer needed in WP5
 mfs.join = path.join;
 
+let id: number;
+
+export const mRequire = (modulePath: string): any => {
+	const require = createFsRequire(mfs, {
+		fs: true,
+	});
+
+	id = require.id;
+
+	return require(modulePath);
+};
+
 sourceMapSupport.install({
 	environment: 'node',
 	retrieveFile(filePath: string) {
+		const fsRequirePrefix = `fs-require://${id}/`;
+
+		if (filePath.startsWith(fsRequirePrefix)) {
+			filePath = filePath.slice(fsRequirePrefix.length - 1);
+		}
+
 		if (mfs.existsSync(filePath)) {
 			return mfs.readFileSync(filePath).toString();
 		}
 	},
 });
-
-export const mRequire = (modulePath: string): any => (
-	createFsRequire(mfs, {
-		fs: true,
-	})(modulePath)
-);