Add test with polyfill injection

packages/babel-plugin-proposal-json-modules/package.json

@@ -38,7 +38,8 @@
   },
   "devDependencies": {
     "@babel/core": "workspace:^",
-    "@babel/helper-plugin-test-runner": "workspace:^"
+    "@babel/helper-plugin-test-runner": "workspace:^",
+    "babel-plugin-polyfill-corejs3": "^0.8.7"
   },
   "engines": {
     "node": ">=6.9.0"

packages/babel-plugin-proposal-json-modules/test/fixtures/integration/chrome-41-esm-polyfills/input.js

@@ -0,0 +1,2 @@
+import j1 from "./x1.json" with { type: "json" };
+import j2 from "./x2.json" with { type: "json" };

packages/babel-plugin-proposal-json-modules/test/fixtures/integration/chrome-41-esm-polyfills/options.json

@@ -0,0 +1,8 @@
+{
+  "sourceType": "module",
+  "targets": { "firefox": "41" },
+  "plugins": [
+    "proposal-json-modules",
+    ["babel-plugin-polyfill-corejs3", { "method": "usage-pure" }]
+  ]
+}

packages/babel-plugin-proposal-json-modules/test/fixtures/integration/chrome-41-esm-polyfills/output.mjs

@@ -0,0 +1,3 @@
+import _Promise from "core-js-pure/stable/promise/index.js";
+import _URL from "core-js-pure/stable/url/index.js";
+const [j1, j2] = await _Promise.all([fetch(import.meta.resolve?.("./x1.json") ?? new _URL("./x1.json", import.meta.url)).then(r => r.json()), fetch(import.meta.resolve?.("./x2.json") ?? new _URL("./x2.json", import.meta.url)).then(r => r.json())]);

yarn.lock

@@ -1566,6 +1566,7 @@ __metadata:
     "@babel/helper-plugin-test-runner": "workspace:^"
     "@babel/helper-plugin-utils": "workspace:^"
     "@babel/plugin-syntax-import-attributes": "workspace:^"
+    babel-plugin-polyfill-corejs3: "npm:^0.8.7"
   peerDependencies:
     "@babel/core": ^7.22.0
   languageName: unknown