ensure bundle ends with newline – fixes #958

src/Bundle.js

@@ -431,6 +431,7 @@ export default class Bundle {
 			timeEnd( 'sourceMap' );
 		}
 
+		if ( code[ code.length - 1 ] !== '\n' ) code += '\n';
 		return { code, map };
 	}
 

src/rollup.js

@@ -108,7 +108,7 @@ export function rollup ( options ) {
 						promises.push( writeFile( dest + '.map', map.toString() ) );
 					}
 
-					code += `\n//# ${SOURCEMAPPING_URL}=${url}\n`;
+					code += `//# ${SOURCEMAPPING_URL}=${url}\n`;
 				}
 
 				promises.push( writeFile( dest, code ) );

test/test.js

@@ -102,6 +102,16 @@ describe( 'rollup', function () {
 				plugins: [ loader({ x: `var a = null; a = 'a string';` }) ]
 			});
 		});
+
+		it( 'includes a newline at the end of the bundle', () => {
+			return rollup.rollup({
+				entry: 'x',
+				plugins: [ loader({ x: `console.log( 42 );` }) ]
+			}).then( bundle => {
+				const { code } = bundle.generate({ format: 'iife' });
+				assert.ok( code[ code.length - 1 ] === '\n' );
+			});
+		});
 	});
 
 	describe( 'bundle.write()', () => {