Fix esmodules: true without specified browsers (#12908)

* Fix `esmodules: true` without specified browsers

* fix

config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  targets: { esmodules: true },
+};

packages/babel-helper-compilation-targets/src/index.js

@@ -205,7 +205,7 @@ export default function getTargets(
 
   // `esmodules` as a target indicates the specific set of browsers supporting ES Modules.
   // These values OVERRIDE the `browsers` field.
-  if (esmodules && (esmodules !== "intersect" || !browsers)) {
+  if (esmodules && (esmodules !== "intersect" || !browsers?.length)) {
     browsers = Object.keys(ESM_SUPPORT)
       .map(browser => `${browser} >= ${ESM_SUPPORT[browser]}`)
       .join(", ");

packages/babel-helper-compilation-targets/test/targets-parser.spec.js

@@ -267,6 +267,12 @@ describe("getTargets", () => {
     });
 
     it("'intersect' behaves like 'true' if no browsers are specified", () => {
+      expect(getTargets({ esmodules: "intersect" })).toEqual(
+        getTargets({ esmodules: true }, { ignoreBrowserslistConfig: true }),
+      );
+    });
+
+    it("'intersect' behaves like 'true' if no browsers are specified and the browserslist config is ignored", () => {
       expect(
         getTargets(
           { esmodules: "intersect" },

packages/babel-preset-env/test/fixtures/sanity/top-level-targets-esmodules/input.js

@@ -0,0 +1 @@
+a ** b;

packages/babel-preset-env/test/fixtures/sanity/top-level-targets-esmodules/options.json

@@ -0,0 +1,4 @@
+{
+  "targets": { "esmodules": true },
+  "presets": ["env"]
+}

packages/babel-preset-env/test/fixtures/sanity/top-level-targets-esmodules/output.js

@@ -0,0 +1 @@
+a ** b;