Fix for legacy manifest file

package.json

@@ -74,6 +74,7 @@
     "test": "mocha --opts mocha.opts",
     "pretest": "npm run build",
     "build": "rm -rf dist && rollup -c",
+    "prepare": "npm run build",
     "dev": "rollup -cw",
     "prepublishOnly": "npm test",
     "update_mime_types": "curl http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types | grep -e \"^[^#]\" > src/middleware/mime-types.md"

src/api/build.ts

@@ -79,7 +79,8 @@ async function execute(emitter: EventEmitter, opts: Opts, dirs: Dirs) {
 			// TODO duration/warnings
 			result: client_result
 		});
-
+		
+		client_result.to_json(manifest_data, dirs);
 		build_info.legacy_assets = client_result.assets;
 		delete process.env.SAPPER_LEGACY_BUILD;
 	}

src/core/create_compilers/extract_css.ts

@@ -170,6 +170,7 @@ export default function extract_css(client_result: CompileResult, components: Pa
 	}
 
 	const main = client_result.assets.main;
+	if (process.env.SAPPER_LEGACY_BUILD) main = `legacy/${main}`;
 	const entry = fs.readFileSync(`${dirs.dest}/client/${main}`, 'utf-8');
 
 	const replacements = new Map();