test(client): improve es5 check

Author: knagaitsev

package-lock.json

@@ -75,6 +75,7 @@
     "@commitlint/cli": "^8.3.5",
     "@commitlint/config-conventional": "^8.3.4",
     "@jest/test-sequencer": "^26.0.1",
+    "acorn": "^7.3.1",
     "babel-jest": "^26.0.1",
     "babel-loader": "^8.1.0",
     "body-parser": "^1.19.0",

package.json

@@ -0,0 +1,58 @@
+'use strict';
+
+const acorn = require('acorn');
+const request = require('supertest');
+const testServer = require('../helpers/test-server');
+const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map').bundle;
+const isWebpack5 = require('../helpers/isWebpack5');
+
+describe('bundle', () => {
+  // the ES5 check test for the bundle will not work on webpack@5,
+  // because webpack@5 bundle output uses some ES6 syntax
+  const runBundleTest = isWebpack5 ? describe.skip : describe;
+
+  runBundleTest('bundled output', () => {
+    let server;
+    let req;
+
+    beforeAll((done) => {
+      server = testServer.start(config, { port }, done);
+      req = request(server.app);
+    });
+
+    afterAll(testServer.close);
+
+    it('should get full user bundle and parse with ES5', async () => {
+      const { text } = await req
+        .get('/main.js')
+        .expect('Content-Type', 'application/javascript; charset=UTF-8')
+        .expect(200);
+
+      expect(() => {
+        let evalStep = 0;
+        acorn.parse(text, {
+          ecmaVersion: 5,
+          onToken: (token) => {
+            if (token.type.label === 'name' && token.value === 'eval') {
+              evalStep += 1;
+            } else if (token.type.label === '(' && evalStep === 1) {
+              evalStep += 1;
+            } else if (token.type.label === 'string' && evalStep === 2) {
+              const program = token.value;
+              try {
+                acorn.parse(program, {
+                  ecmaVersion: 5,
+                });
+              } catch (e) {
+                console.log(program);
+              }
+
+              evalStep = 0;
+            }
+          },
+        });
+      }).not.toThrow();
+    });
+  });
+});

test/client/bundle.test.js

@@ -40,6 +40,7 @@ const portsList = {
   'progress-option': 1,
   'profile-option': 1,
   Iframe: 1,
+  bundle: 1,
 };
 
 let startPort = 8089;