Add some testing initial rollup testing. NFC (emscripten-core#23439)

I think we we getting some indirect testing already via the vite tests I added but this tests rollup directly, which will be useful once we start developing the planning rollup plugin.
aheejin · Jan 17, 2025 · c0fe9f2 · c0fe9f2
1 parent 0f6b437
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diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -8,6 +8,7 @@
     "eslint-config-prettier": "^9.1.0",
     "globals": "^15.14.0",
     "prettier": "^3.4.2",
+    "rollup": "^4.30.1",
     "source-map": "0.7.4",
     "typescript": "^5.7.2",
     "vite": "^6.0.7",

diff --git a/test/rollup/index.html b/test/rollup/index.html
@@ -0,0 +1,6 @@
+<html>
+  <body>
+    <hr><div id='output'></div><hr>
+    <script type="module" src="./bundle.mjs"></script>
+  </body>
+</html>
diff --git a/test/rollup/index.mjs b/test/rollup/index.mjs
@@ -0,0 +1,17 @@
+var params = {
+  print: (function() {
+    var element = document.getElementById('output');
+    return function(text) {
+      console.log(text);
+      element.innerHTML += text.replace('\n', '<br>', 'g') + '<br>';
+    };
+  })(),
+  canvas: document.getElementById('canvas'),
+};
+
+params.print("testing..");
+
+import Module from './hello.mjs';
+Module(params).then((instance) => {
+  console.log('loaded');
+});
diff --git a/test/rollup/rollup.config.mjs b/test/rollup/rollup.config.mjs
@@ -0,0 +1,7 @@
+export default {
+  input: 'index.mjs',
+  output: {
+    file: 'bundle.mjs',
+    format: 'es'
+  }
+};
diff --git a/test/test_browser.py b/test/test_browser.py
@@ -5528,6 +5528,13 @@ def test_vite(self):
       self.run_process(shared.get_npm_cmd('vite') + ['build'])
     self.run_browser('vite/dist/index.html', '/report_result?exit:0')
 
+  def test_rollup(self):
+    shutil.copytree(test_file('rollup'), 'rollup')
+    with common.chdir('rollup'):
+      self.compile_btest('hello_world.c', ['-sEXPORT_ES6', '-sEXIT_RUNTIME', '-sMODULARIZE', '-o', 'hello.mjs'])
+      self.run_process(shared.get_npm_cmd('rollup') + ['--config'])
+    self.run_browser('rollup/index.html', '/report_result?exit:0')
+
 
 class emrun(RunnerCore):
   def test_emrun_info(self):