Detect whether error source is on a different drive (on Windows)

Author: novemberborn

lib/serialize-error.js

@@ -39,7 +39,8 @@ function buildSource(source) {
 	const file = path.resolve(projectDir, source.file.trim());
 	const rel = path.relative(projectDir, file);
 
-	const isWithinProject = rel.split(path.sep)[0] !== '..';
+	const [segment] = rel.split(path.sep);
+	const isWithinProject = segment !== '..' && (process.platform !== 'win32' || !segment.includes(':'));
 	const isDependency = isWithinProject && path.dirname(rel).split(path.sep).includes('node_modules');
 
 	return {