Reduce browser build size 1450kB -> 820kB

Author: TrySound

package.json

@@ -52,7 +52,7 @@
     "test": "nyc --reporter=html --reporter=text mocha \"test/*/_index.js\"",
     "lint": "eslint .",
     "test-browser": "rollup -c && node ./test/browser.js",
-    "prepublishOnly": "rollup -c"
+    "prepublishOnly": "rm -rf dist && rollup -c"
   },
   "eslintConfig": {
     "ignorePatterns": [

rollup.config.js

@@ -13,10 +13,14 @@ export default {
   },
   plugins: [
     {
-      resolveId(importee) {
+      resolveId(importee, importer) {
         if (['os', 'stream', 'string_decoder'].includes(importee)) {
           return importee;
         }
+        // see https://github.com/csstree/csstree/pull/152
+        if (importee === 'css-tree') {
+          return this.resolve('css-tree/dist/csstree.min.js', importer);
+        }
       },
       load(id) {
         if (id === 'os') {

test/browser.js

@@ -58,6 +58,7 @@ const runTest = async () => {
 server.listen(5000, async () => {
   try {
     await runTest();
+    console.info('Tested successfully');
     server.close()
   } catch (error) {
     server.close();