Add test

packages/core/integration-tests/test/integration/env-unused-require/index.js

@@ -0,0 +1,7 @@
+module.exports = function () {
+  if(process.env.ABC === 'a') {
+    return require("./unused.js");
+  } else {
+    return "ok";
+  }
+};

packages/core/integration-tests/test/integration/env-unused-require/unused.js

@@ -0,0 +1 @@
+module.exports = "unused";

packages/core/integration-tests/test/javascript.js

@@ -347,6 +347,28 @@ describe('javascript', function () {
     assert(!contents.includes('import'));
   });
 
+  it('should ignore unused requires after process.env inlining', async function () {
+    let b = await bundle(
+      path.join(__dirname, '/integration/env-unused-require/index.js'),
+      {
+        env: {ABC: 'XYZ'},
+      },
+    );
+
+    assertBundles(b, [
+      {
+        type: 'js',
+        assets: ['index.js'],
+      },
+    ]);
+
+    let contents = await outputFS.readFile(b.getBundles()[0].filePath, 'utf8');
+    assert(!contents.includes('unused'));
+
+    let output = await run(b);
+    assert.strictEqual(output(), 'ok');
+  });
+
   it('should produce a basic JS bundle with object rest spread support', async function () {
     let b = await bundle(
       path.join(