Merge pull request #605 from developit/fix-babel-modern

Fix babel modern

Author: developit

src/index.js

@@ -252,7 +252,9 @@ export default async function microbundle(inputOptions) {
 	let out = await series(
 		steps.map(config => async () => {
 			const { inputOptions, outputOptions } = config;
-			inputOptions.cache = cache;
+			if (inputOptions.cache !== false) {
+				inputOptions.cache = cache;
+			}
 			let bundle = await rollup(inputOptions);
 			cache = bundle;
 			await bundle.write(outputOptions);
@@ -498,6 +500,9 @@ function createConfig(options, entry, format, writeMeta) {
 
 	let config = {
 		inputOptions: {
+			// disable Rollup's cache for the modern build to prevent re-use of legacy transpiled modules:
+			cache: modern ? false : undefined,
+
 			input: entry,
 			external: id => {
 				if (id === 'babel-plugin-transform-async-to-promises/helpers') {

test/__snapshots__/index.test.js.snap

@@ -1887,8 +1887,8 @@ modern-generators
 Build \\"modernGenerators\\" to dist:
 234 B: modern-generators.js.gz
 207 B: modern-generators.js.br
-233 B: modern-generators.modern.js.gz
-191 B: modern-generators.modern.js.br
+113 B: modern-generators.modern.js.gz
+92 B: modern-generators.modern.js.br
 233 B: modern-generators.esm.js.gz
 191 B: modern-generators.esm.js.br
 311 B: modern-generators.umd.js.gz
@@ -1910,7 +1910,7 @@ exports[`fixtures build modern-generators with microbundle 4`] = `
 `;
 
 exports[`fixtures build modern-generators with microbundle 5`] = `
-"var e=regeneratorRuntime.mark(r);function r(){var r;return regeneratorRuntime.wrap(function(e){for(;;)switch(e.prev=e.next){case 0:r=0;case 1:return e.next=4,r++;case 4:e.next=1;break;case 6:case\\"end\\":return e.stop()}},e)}export default function(){try{var e=r();return Promise.resolve([e.next().value,e.next().value])}catch(e){return Promise.reject(e)}}
+"export default async function(){const e=function*(){let e=0;for(;;)yield e++}();return[e.next().value,e.next().value]}
 //# sourceMappingURL=modern-generators.modern.js.map
 "
 `;