include sourcesContent and filename in sourcemap

src/Bundle.js

@@ -205,6 +205,8 @@ export default class Bundle {
 		return {
 			code: magicString.toString(),
 			map: magicString.generateMap({
+				includeContent: true,
+				file: options.dest
 				// TODO
 			})
 		};

src/rollup.js

@@ -14,8 +14,12 @@ export function rollup ( entry, options = {} ) {
 	return bundle.build().then( () => {
 		return {
 			generate: options => bundle.generate( options ),
-			write: ( dest, options ) => {
-				let { code, map } = bundle.generate( options );
+			write: ( dest, options = {} ) => {
+				let { code, map } = bundle.generate({
+					dest,
+					format: options.format,
+					globalName: options.globalName
+				});
 
 				code += `\n//# ${SOURCEMAPPING_URL}=${basename( dest )}.map`;