diff --git a/packages/core/core/src/Parcel.js b/packages/core/core/src/Parcel.js
index bc748d31b6c..02ee4b07046 100644
--- a/packages/core/core/src/Parcel.js
+++ b/packages/core/core/src/Parcel.js
@@ -164,7 +164,6 @@ export default class Parcel {
       this.#disposable.dispose(),
       await this.#requestTracker.writeToCache(),
     ]);
-    await this.#farm.callAllWorkers('clearConfigCache', []);
   }
 
   async _startNextBuild(): Promise<?BuildEvent> {
@@ -359,6 +358,8 @@ export default class Parcel {
       if (this.isProfiling) {
         await this.stopProfiling();
       }
+
+      await this.#farm.callAllWorkers('clearConfigCache', []);
     }
   }
 
diff --git a/packages/core/core/src/public/Environment.js b/packages/core/core/src/public/Environment.js
index 16e27070aea..4782de5ad46 100644
--- a/packages/core/core/src/public/Environment.js
+++ b/packages/core/core/src/public/Environment.js
@@ -57,13 +57,15 @@ const supportData = {
     edge: '16',
     firefox: '60',
     chrome: '61',
-    safari: '11',
+    safari: '10.1',
     opera: '48',
-    ios: '11',
+    ios: '10.3',
     android: '76',
     and_chr: '76',
     and_ff: '68',
     samsung: '8.2',
+    and_qq: '10.4',
+    op_mob: '64',
   },
   'dynamic-import': {
     edge: '76',
@@ -76,6 +78,8 @@ const supportData = {
     and_chr: '63',
     and_ff: '67',
     samsung: '8',
+    and_qq: '10.4',
+    op_mob: '64',
   },
   'worker-module': {
     edge: '80',
@@ -98,6 +102,8 @@ const supportData = {
     and_chr: '64',
     and_ff: '62',
     samsung: '9.2',
+    and_qq: '10.4',
+    op_mob: '64',
   },
   'arrow-functions': {
     chrome: '47',
@@ -109,6 +115,12 @@ const supportData = {
     ios: '10',
     samsung: '5',
     electron: '0.36',
+    android: '50',
+    qq: '10.4',
+    baidu: '7.12',
+    kaios: '2.5',
+    and_qq: '12.12',
+    op_mob: '64',
   },
 };
 
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/.eslintrc.json b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/.eslintrc.json
new file mode 100644
index 00000000000..f89e231fa93
--- /dev/null
+++ b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/.eslintrc.json
@@ -0,0 +1,6 @@
+{
+  "extends": "../.eslintrc.json",
+  "parserOptions": {
+    "sourceType": "module"
+  }
+}
\ No newline at end of file
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/index.js b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/index.js
new file mode 100644
index 00000000000..21b5030d8ab
--- /dev/null
+++ b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/index.js
@@ -0,0 +1,4 @@
+import Foo from 'foo';
+
+export {Foo};
+export class Bar {}
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/index.js b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/index.js
new file mode 100644
index 00000000000..14b30579450
--- /dev/null
+++ b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/index.js
@@ -0,0 +1,3 @@
+export default function Test() {
+  return <div>Test</div>
+}
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/package.json b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/package.json
new file mode 100644
index 00000000000..bde99de9287
--- /dev/null
+++ b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/node_modules/foo/package.json
@@ -0,0 +1,3 @@
+{
+  "name": "foo"
+}
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/package.json b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/package.json
new file mode 100644
index 00000000000..8e8616ee3b0
--- /dev/null
+++ b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/package.json
@@ -0,0 +1,5 @@
+{
+  "name": "parcel-test-browser-browserslist",
+  "private": true,
+  "browserslist": ["last 2 Chrome versions", "IE >= 11"]
+}
diff --git a/packages/core/integration-tests/test/integration/babel-node-modules-jsx/yarn.lock b/packages/core/integration-tests/test/integration/babel-node-modules-jsx/yarn.lock
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/packages/core/integration-tests/test/transpilation.js b/packages/core/integration-tests/test/transpilation.js
index 7b1c2cca574..4ee4e9a6a05 100644
--- a/packages/core/integration-tests/test/transpilation.js
+++ b/packages/core/integration-tests/test/transpilation.js
@@ -56,17 +56,26 @@ describe('transpilation', function () {
     assert(modern.includes('class Bar'));
   });
 
-  it('should not transpile node_modules by default', async function () {
+  it('should transpile node_modules by default', async function () {
     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(!/class \S+ \{/.test(file));
     assert(file.includes('function Bar'));
   });
 
-  it('should not compile node_modules with a source field in package.json when not symlinked', async function () {
+  it('should not support JSX in node_modules', async function () {
+    // $FlowFixMe
+    await assert.rejects(() =>
+      bundle(
+        path.join(__dirname, '/integration/babel-node-modules-jsx/index.js'),
+      ),
+    );
+  });
+
+  it('should compile node_modules with a source field in package.json when not symlinked', async function () {
     await bundle(
       path.join(
         __dirname,
@@ -75,7 +84,7 @@ describe('transpilation', function () {
     );
 
     let file = await outputFS.readFile(path.join(distDir, 'index.js'), 'utf8');
-    assert(!file.includes('function Foo'));
+    assert(file.includes('function Foo'));
     assert(file.includes('function Bar'));
   });
 
diff --git a/packages/transformers/js/src/JSTransformer.js b/packages/transformers/js/src/JSTransformer.js
index 61476bc84d7..2ba3eacfc9b 100644
--- a/packages/transformers/js/src/JSTransformer.js
+++ b/packages/transformers/js/src/JSTransformer.js
@@ -290,49 +290,47 @@ export default (new Transformer({
     ]);
 
     let targets;
-    if (asset.isSource) {
-      if (asset.env.isElectron() && asset.env.engines.electron) {
-        targets = {
-          electron: semver.minVersion(asset.env.engines.electron)?.toString(),
-        };
-      } else if (asset.env.isBrowser() && asset.env.engines.browsers) {
-        targets = {};
+    if (asset.env.isElectron() && asset.env.engines.electron) {
+      targets = {
+        electron: semver.minVersion(asset.env.engines.electron)?.toString(),
+      };
+    } else if (asset.env.isBrowser() && asset.env.engines.browsers) {
+      targets = {};
 
-        let browsers = Array.isArray(asset.env.engines.browsers)
-          ? asset.env.engines.browsers
-          : [asset.env.engines.browsers];
+      let browsers = Array.isArray(asset.env.engines.browsers)
+        ? asset.env.engines.browsers
+        : [asset.env.engines.browsers];
 
-        // If the output format is esmodule, exclude browsers
-        // that support them natively so that we transpile less.
-        if (asset.env.outputFormat === 'esmodule') {
-          browsers = [...browsers, ...ESMODULE_BROWSERS];
-        }
+      // If the output format is esmodule, exclude browsers
+      // that support them natively so that we transpile less.
+      if (asset.env.outputFormat === 'esmodule') {
+        browsers = [...browsers, ...ESMODULE_BROWSERS];
+      }
 
-        browsers = browserslist(browsers);
-        for (let browser of browsers) {
-          let [name, version] = browser.split(' ');
-          if (BROWSER_MAPPING.hasOwnProperty(name)) {
-            name = BROWSER_MAPPING[name];
-            if (!name) {
-              continue;
-            }
+      browsers = browserslist(browsers);
+      for (let browser of browsers) {
+        let [name, version] = browser.split(' ');
+        if (BROWSER_MAPPING.hasOwnProperty(name)) {
+          name = BROWSER_MAPPING[name];
+          if (!name) {
+            continue;
           }
+        }
 
-          let [major, minor = '0', patch = '0'] = version
-            .split('-')[0]
-            .split('.');
-          let semverVersion = `${major}.${minor}.${patch}`;
+        let [major, minor = '0', patch = '0'] = version
+          .split('-')[0]
+          .split('.');
+        if (isNaN(major) || isNaN(minor) || isNaN(patch)) {
+          continue;
+        }
+        let semverVersion = `${major}.${minor}.${patch}`;
 
-          if (
-            targets[name] == null ||
-            semver.gt(targets[name], semverVersion)
-          ) {
-            targets[name] = semverVersion;
-          }
+        if (targets[name] == null || semver.gt(targets[name], semverVersion)) {
+          targets[name] = semverVersion;
         }
-      } else if (asset.env.isNode() && asset.env.engines.node) {
-        targets = {node: semver.minVersion(asset.env.engines.node)?.toString()};
       }
+    } else if (asset.env.isNode() && asset.env.engines.node) {
+      targets = {node: semver.minVersion(asset.env.engines.node)?.toString()};
     }
 
     let env: EnvMap = {};