resolve currentPath (#4591)

* resolve currentPath

* Try modified test

* Add test

Co-authored-by: undefined <undefined>
Co-authored-by: Lukas Taegert-Atkinson <lukas.taegert-atkinson@tngtech.com>
Co-authored-by: Lukas Taegert-Atkinson <lukastaegert@users.noreply.github.com>

src/Chunk.ts

@@ -464,7 +464,7 @@ export default class Chunk {
 			});
 			const currentPath = `${currentDir}/${fileName}`;
 			const { preserveModulesRoot } = options;
-			if (preserveModulesRoot && currentPath.startsWith(preserveModulesRoot)) {
+			if (preserveModulesRoot && resolve(currentPath).startsWith(preserveModulesRoot)) {
 				path = currentPath.slice(preserveModulesRoot.length).replace(/^[\\/]/, '');
 			} else {
 				path = relative(preserveModulesRelativeDir, currentPath);

test/chunking-form/samples/preserve-modules-root/_config.js

@@ -7,6 +7,14 @@ module.exports = {
 	options: {
 		input: ['src/under-build.js', 'src/below/module.js'],
 		plugins: [
+			{
+				name: 'convert-slashes',
+				// This simulates converted slashes as used by e.g. Vite
+				async resolveId(source, importer, options) {
+					const resolved = await this.resolve(source, importer, { ...options, skipSelf: true });
+					return { ...resolved, id: resolved.id.replace(/\\/g, '/') };
+				}
+			},
 			resolve({
 				moduleDirectories: ['custom_modules']
 			}),