fix sourcemap options

src/Bundle.js

@@ -274,17 +274,21 @@ export default class Bundle {
 		magicString = finalise( this, magicString.trim(), exportMode, options );
 
 		const code = magicString.toString();
-		let map = magicString.generateMap({
-			includeContent: true,
-			file: options.sourceMapFile || options.dest
-			// TODO
-		});
+		let map = null;
 
-		// make sources relative. TODO fix this upstream?
-		const dir = dirname( map.file );
-		map.sources = map.sources.map( source => {
-			return source ? relative( dir, source ) : null
-		});
+		if ( options.sourceMap ) {
+			map = magicString.generateMap({
+				includeContent: true,
+				file: options.sourceMapFile || options.dest
+				// TODO
+			});
+
+			// make sources relative. TODO fix this upstream?
+			const dir = dirname( map.file );
+			map.sources = map.sources.map( source => {
+				return source ? relative( dir, source ) : null
+			});
+		}
 
 		return { code, map };
 	}

src/rollup.js

@@ -21,17 +21,27 @@ export function rollup ( entry, options = {} ) {
 					globalName: options.globalName,
 
 					// sourcemap options
-					sourceMap: options.sourceMap,
+					sourceMap: !!options.sourceMap,
 					sourceMapFile: options.sourceMapFile,
-					sourceMapRoot: options.sourceMapRoot
+					// sourceMapRoot: options.sourceMapRoot
 				});
 
-				code += `\n//# ${SOURCEMAPPING_URL}=${basename( dest )}.map`;
+				let promises = [ writeFile( dest, code ) ];
 
-				return Promise.all([
-					writeFile( dest, code ),
-					writeFile( dest + '.map', map.toString() )
-				]);
+				if ( options.sourceMap ) {
+					let url;
+
+					if ( options.sourceMap === 'inline' ) {
+						url = map.toUrl();
+					} else {
+						url = `${basename( dest )}.map`;
+						promises.push( writeFile( dest + '.map', map.toString() ) );
+					}
+
+					code += `\n//# ${SOURCEMAPPING_URL}=${url}`;
+				}
+
+				return Promise.all( promises );
 			}
 		};
 	});

test/test.js

@@ -179,6 +179,7 @@ describe( 'rollup', function () {
 						return bundlePromise.then( function ( bundle ) {
 							var result = bundle.generate({
 								format: profile.format,
+								sourceMap: true,
 								sourceMapFile: 'bundle.js'
 							});