Do not transpile @swc/helpers (#7529)

parcel-bundler · Jan 6, 2022 · c85eb04 · c85eb04
1 parent 5a80fbe
commit c85eb04
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Showing 3 changed files with 9 additions and 1 deletion.
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules/index.js b/packages/core/integration-tests/test/integration/babel-node-modules/index.js
@@ -2,3 +2,4 @@ import Foo from 'foo';
 
 export {Foo};
 export class Bar {}
+export const t = typeof Foo;
diff --git a/packages/core/integration-tests/test/transpilation.js b/packages/core/integration-tests/test/transpilation.js
@@ -57,13 +57,15 @@ describe('transpilation', function () {
   });
 
   it('should transpile node_modules by default', async function () {
-    await bundle(
+    let b = await bundle(
       path.join(__dirname, '/integration/babel-node-modules/index.js'),
     );
 
     let file = await outputFS.readFile(path.join(distDir, 'index.js'), 'utf8');
     assert(!/class \S+ \{/.test(file));
     assert(file.includes('function Bar'));
+    let res = await run(b);
+    assert.equal(res.t, 'function');
   });
 
   it('should not support JSX in node_modules', async function () {

diff --git a/packages/transformers/js/src/JSTransformer.js b/packages/transformers/js/src/JSTransformer.js
@@ -333,6 +333,11 @@ export default (new Transformer({
       targets = {node: semver.minVersion(asset.env.engines.node)?.toString()};
     }
 
+    // Avoid transpiling @swc/helpers so that we don't cause infinite recursion.
+    if (asset.filePath.includes('@swc/helpers')) {
+      targets = null;
+    }
+
     let env: EnvMap = {};
 
     if (!config?.inlineEnvironment) {