evanw · Nov 10, 2024 · Nov 10, 2024 · Nov 22, 2024
Showing with 2,553 additions and 21 deletions.

+52 −11 README.md

+2 −2 node-test-loader.mjs

+10 −8 package.json

+26 −0 tests.js

+2,463 −0 yarn.lock
diff --git a/README.md b/README.md
@@ -12,10 +12,17 @@ Each test has a "direct" version and an "indirect" version. The indirect version
 
 All tests have been run through the JS bundlers Webpack, Rollup, Parcel, and esbuild. Tests have additionally been run through node for comparison, although please keep in mind that node is not a JS bundler and shouldn't be expected to implement bundler-specific features such as `require()` of ESM code.
 
+# Usage
+
+```
+yarn
+node ./tests.js
+```
+
 ## Results
 
 <table>
-<tr><th>Test</th><th>esbuild</th><th>node</th><th>webpack</th><th>parcel</th><th>rollup</th></tr>
+<tr><th>Test</th><th>esbuild</th><th>rolldown</th><th>node</th><th>webpack</th><th>parcel</th><th>rollup</th></tr>
 <tr><td>Direct:<pre>entry.js:
   import * as entry from './entry.js'
   input.works = entry.__esModule === void 0
@@ -25,8 +32,9 @@ All tests have been run through the JS bundlers Webpack, Rollup, Parcel, and esb
     entry[Math.random() < 1 && '__esModule'] === void 0
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
-<td>webpack<br>✅<br><br>webpack<br>🚫</td>
+<td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
 <td>rollup<br>🚫<br><br>rollup<br>🚫</td>
 </tr>
@@ -43,6 +51,7 @@ foo.js:
     foo[Math.random() < 1 && '__esModule'] === void 0
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -61,6 +70,7 @@ foo.js:
   module[Math.random() < 1 && 'exports'] = '123'
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -81,6 +91,7 @@ foo.js:
   export let bar = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -103,8 +114,9 @@ foo.js:
   export default { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
-<td>webpack<br>✅<br><br>webpack<br>🚫</td>
+<td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
 <td>rollup<br>✅<br><br>rollup<br>✅</td>
 </tr>
@@ -124,10 +136,11 @@ foo.js:
   exports[Math.random() < 1 && 'default'] = { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
-<td>rollup<br>🚫<br><br>rollup<br>✅</td>
+<td>rollup<br>✅<br><br>rollup<br>✅</td>
 </tr>
 <tr><td>Direct:<pre>entry.js:
   const foo = require('./foo.js')
@@ -152,6 +165,7 @@ foo.js:
   export let bar = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -168,6 +182,7 @@ foo.js:
   exports.foo = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -184,6 +199,7 @@ foo.js:
   export {}
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -200,6 +216,7 @@ foo.js:
   export default 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -219,6 +236,7 @@ foo.js:
   export let bar = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -239,6 +257,7 @@ foo.js:
   export default 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -262,6 +281,7 @@ bar.js:
   export let baz = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -283,6 +303,7 @@ foo.js:
     { default: { bar: 123 } }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -300,6 +321,7 @@ foo.js:
   module[Math.random() < 1 && 'exports'] = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -320,6 +342,7 @@ foo.js:
   exports[Math.random() < 1 && 'default'] = { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -340,6 +363,7 @@ foo.js:
   export default 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -357,6 +381,7 @@ foo.js:
   module[Math.random() < 1 && 'exports'] = '123'
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -374,6 +399,7 @@ foo.js:
   module[Math.random() < 1 && 'exports'] = '123'
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -396,6 +422,7 @@ foo.js:
   exports.bar = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -418,6 +445,7 @@ foo.js:
   export default { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -438,6 +466,7 @@ foo.js:
   export default { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -458,6 +487,7 @@ foo.js:
   export default { bar: 123 }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -476,6 +506,7 @@ foo.js:
   export let __esModule = 0
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>🚫<br><br>node<br>🚫</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -494,6 +525,7 @@ foo.js:
     { bar: 123, __esModule: true }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -518,6 +550,7 @@ package.json:
   { "type": "module" }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -538,6 +571,7 @@ foo.js:
     { default: { bar: 123 }, __esModule: true }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -558,6 +592,7 @@ foo.js:
     { default: { bar: 123 }, __esModule: true }
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>🚫<br><br>webpack<br>🚫</td>
 <td>parcel<br>🚫<br><br>parcel<br>🚫</td>
@@ -581,6 +616,7 @@ foo.js:
   exports[Math.random() < 1 && 'foo'] = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -604,6 +640,7 @@ foo.js:
   exports[Math.random() < 1 && 'foo'] = 123
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -629,6 +666,7 @@ foo.js:
     Math.random() < 1 && 'default', { value: 123 })
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
@@ -654,26 +692,29 @@ foo.js:
     { value: 123, enumerable: true })
 </pre></td>
 <td>esbuild<br>✅<br><br>esbuild<br>✅</td>
+<td>rolldown<br>✅<br><br>rolldown<br>✅</td>
 <td>node<br>✅<br><br>node<br>✅</td>
 <td>webpack<br>✅<br><br>webpack<br>✅</td>
 <td>parcel<br>✅<br><br>parcel<br>✅</td>
 <td>rollup<br>✅<br><br>rollup<br>✅</td>
 </tr>
 <tr><td>Percent handled:</td>
 <td>100.0%</td>
+<td>100.0%</td>
 <td>78.1%</td>
-<td>71.9%</td>
+<td>68.8%</td>
 <td>53.1%</td>
-<td>46.9%</td>
+<td>48.4%</td>
 </tr>
 </table>
 
 ## Visual summary
 
 <pre>
-esbuild: ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅
-node:    ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅
-webpack: ✅🚫 🚫🚫 ✅🚫 🚫🚫 ✅🚫 ✅🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅
-parcel:  ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅
-rollup:  🚫🚫 🚫🚫 ✅✅ 🚫✅ ✅✅ 🚫✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅
+esbuild:  ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅
+rolldown: ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅
+node:     ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅
+webpack:  🚫🚫 🚫🚫 ✅🚫 🚫🚫 🚫🚫 ✅🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅
+parcel:   ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅
+rollup:   🚫🚫 🚫🚫 ✅✅ 🚫✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ 🚫🚫 ✅✅ ✅✅ ✅✅ 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 🚫🚫 ✅✅
 </pre>
diff --git a/node-test-loader.mjs b/node-test-loader.mjs
@@ -21,9 +21,9 @@ export async function load(url, _context, _defaultLoad) {
   globalThis.require = createRequire(url);
   const source = readFileSync(fileURLToPath(url)).toString();
   if (cjsModuleRegEx.test(source)) {
-    return { format: 'commonjs', source };
+    return { format: 'commonjs', source, shortCircuit: true };
   }
   else {
-    return { format: 'module', source };
+    return { format: 'module', source, shortCircuit: true };
   }
 }
diff --git a/package.json b/package.json
@@ -1,11 +1,13 @@
 {
   "dependencies": {
-    "@parcel/config-default": "2.3.2",
-    "@parcel/core": "2.3.2",
-    "@rollup/plugin-commonjs": "21.0.2",
-    "@rollup/plugin-node-resolve": "13.1.3",
-    "esbuild": "0.14.27",
-    "rollup": "2.70.1",
-    "webpack": "5.70.0"
-  }
+    "@parcel/config-default": "2.12.0",
+    "@parcel/core": "2.12.0",
+    "@rollup/plugin-commonjs": "28.0.1",
+    "@rollup/plugin-node-resolve": "15.3.0",
+    "esbuild": "0.24.0",
+    "rolldown": "0.14.0-snapshot-bf06e41-20241122003530",
+    "rollup": "4.25.0",
+    "webpack": "5.96.1"
+  },
+  "packageManager": "yarn@1.22.21+sha1.1959a18351b811cdeedbd484a8f86c3cc3bbaf72"
 }
diff --git a/tests.js b/tests.js
@@ -283,6 +283,7 @@ const webpack = require('webpack')
 const esbuild = require('esbuild')
 const parcel = require('@parcel/core')
 const rollup = require('rollup')
+const rolldown = require('rolldown')
 const child_process = require('child_process')
 const pluginNodeResolve = require('@rollup/plugin-node-resolve')
 const pluginCommonJS = require('@rollup/plugin-commonjs')
@@ -291,6 +292,8 @@ const bundlers = {
   async webpack({ entryFile, inDir, outDir }) {
     let err = await new Promise(resolve => webpack({
       entry: path.join(inDir, entryFile),
+      mode: 'development',
+      devtool: false,
       output: {
         path: outDir,
         filename: entryFile,
@@ -335,6 +338,29 @@ const bundlers = {
     }
     return err
   },
+  async rolldown({ entryFile, inDir, outDir }) {
+    let err
+    try {
+      const outfile = path.join(outDir, entryFile)
+      const build = await rolldown.rolldown({
+        input: path.join(inDir, entryFile),
+      });
+      await build.write({
+        file: outfile,
+        format: 'iife',
+        name: 'name',
+        inlineDynamicImports: true,
+      })
+
+      const input = {}
+      new Function('input', fs.readFileSync(outfile, 'utf8'))(input)
+      if (!await input.works) throw new Error('Test did not pass')
+    } catch (e) {
+      if (e && e.errors && e.errors[0]) e = new Error(e.errors[0].text)
+      err = e
+    }
+    return err
+  },
 
   async parcel({ entryFile, inDir, outDir }) {
     let err

diff --git a/yarn.lock b/yarn.lock