WIP - Add webpack 4 tree shaking test

test/cli/build.js

@@ -267,3 +267,29 @@ test('`fusion build` with dynamic imports', async t => {
   );
   t.end();
 });
+
+test('`fusion build` tree shaking', async t => {
+  const dir = path.resolve(__dirname, '../fixtures/tree-shaking');
+  await cmd(`build --dir=${dir}`);
+
+  const serverMain = path.resolve(
+    dir,
+    `.fusion/dist/development/server/server-main.js`
+  );
+  const clientMain = path.resolve(
+    dir,
+    `.fusion/dist/development/client/client-main.js`
+  );
+
+  t.ok(
+    !fs.readFileSync(serverMain, 'utf-8').includes('./src/browserPlugin.js'),
+    'should not include browserPlugin in node'
+  );
+
+  t.ok(
+    !fs.readFileSync(clientMain, 'utf-8').includes('./src/nodePlugin.js'),
+    'should not include nodePlugin in browser'
+  );
+
+  t.end();
+});

test/fixtures/tree-shaking/src/browserPlugin.js

@@ -0,0 +1,7 @@
+import {createPlugin} from 'fusion-core';
+
+export default createPlugin({
+  provides() {
+    console.log('executing browser plugin');
+  },
+});

test/fixtures/tree-shaking/src/main.js

@@ -10,8 +10,13 @@ import readline from 'readline';
 import repl from 'repl';
 import tls from 'tls';
 
+import browserPlugin from './browserPlugin.js';
+import nodePlugin from './nodePlugin.js';
+
 export default async function() {
   const app = new App('element', el => el);
+  __BROWSER__ && app.register(browserPlugin);
+  __NODE__ && app.register(nodePlugin);
   __NODE__ &&
     app.middleware((ctx, next) => {
       if (ctx.url === '/fs') {

test/fixtures/tree-shaking/src/nodePlugin.js

@@ -0,0 +1,7 @@
+import {createPlugin} from 'fusion-core';
+
+export default createPlugin({
+  provides() {
+    console.log('executing node plugin');
+  },
+});