Fixed issue with reading .code from null (untranspiled file due to ig…

…nore/only options) (#193)

packages/rollup-plugin-babel/src/index.js

@@ -69,6 +69,10 @@ export default function babel ( options ) {
 
 			const transformed = transform( code, localOpts );
 
+			if (!transformed) {
+				return { code };
+			}
+
 			return {
 				code: transformed.code,
 				map: transformed.map

packages/rollup-plugin-babel/test/samples/ignored-file/.babelrc

@@ -0,0 +1,4 @@
+{
+  "presets": [ ["@babel/env", { "modules": false, "loose": true } ] ],
+  "ignore": ["ignored.js"]
+}

packages/rollup-plugin-babel/test/samples/ignored-file/ignored.js

@@ -0,0 +1 @@
+export default class Ignored {}

packages/rollup-plugin-babel/test/samples/ignored-file/main.js

@@ -0,0 +1 @@
+export { default } from './ignored';

packages/rollup-plugin-babel/test/test.js

@@ -189,4 +189,10 @@ describe( 'rollup-plugin-babel', function () {
 			assert.equal( code.indexOf( 'var typeof' ), -1, code );
 		});
 	});
+
+	it( 'handles babelrc with ignore option used', () => {
+		return bundle('samples/ignored-file/main.js').then(({ code }) => {
+			assert.ok( code.indexOf('class Ignored') !== -1 );
+		});
+	});
 });