Specify runtime exports (#10853)

test/esm/README.md

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+# test/esm
+
+Holds esm related test for `@babel/*` packages. They should be migrated to Jest tests once Jest supports esm

test/esm/babel-runtime-corejs3.mjs

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+import assert from "assert";
+
+export default {
+  title: "@babel/runtime-corejs3",
+  testcases: [
+    [
+      "it should throw on unknown helpers",
+      () =>
+        assert.rejects(
+          async () =>
+            import("@babel/runtime-corejs3/helpers/esm/unknown-helper"),
+          {
+            name: "Error",
+            code: "ERR_MODULE_NOT_FOUND",
+          }
+        ),
+    ],
+    [
+      "it should not throw on helpers importing internal helpers",
+      () =>
+        assert.doesNotReject(
+          async () =>
+            import("@babel/runtime-corejs3/helpers/esm/wrapNativeSuper"),
+          Error
+        ),
+    ],
+    [
+      "it supports importing with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime/helpers/esm/wrapNativeSuper.js"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing core-js helpers",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/core-js/array/is-array"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing core-js helpers with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () =>
+            import("@babel/runtime-corejs3/core-js/array/is-array.js"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing regenerator helpers",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/regenerator"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing regenerator helpers with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/regenerator/index.js"),
+          Error
+        ),
+    ],
+  ],
+};

test/esm/babel-runtime.mjs

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+import assert from "assert";
+
+export default {
+  title: "@babel/runtime",
+  testcases: [
+    [
+      "it should throw on unknown helpers",
+      () =>
+        assert.rejects(
+          async () => import("@babel/runtime/helpers/esm/unknown-helper"),
+          {
+            name: "Error",
+            code: "ERR_MODULE_NOT_FOUND",
+          }
+        ),
+    ],
+    [
+      "it supports importing with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime/helpers/esm/wrapNativeSuper.js"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on helpers importing internal helpers",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime/helpers/esm/wrapNativeSuper"),
+          Error
+        ),
+    ],
+  ],
+};

test/esm/index.mjs

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+import babelRuntimeTestcases from "./babel-runtime.mjs";
+import babelRuntimeCorejs3Testcases from "./babel-runtime-corejs3.mjs";
+import testRunner from "./test-runner.mjs";
+
+(async () => {
+  await testRunner(babelRuntimeTestcases);
+  await testRunner(babelRuntimeCorejs3Testcases);
+})();

test/esm/package.json

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+{
+  "name": "@babel/test-esm",
+  "private": true,
+  "type": "module",
+  "exports": "./index.mjs",
+  "devDependencies": {
+    "@babel/runtime": "workspace:*",
+    "@babel/runtime-corejs3": "workspace:*",
+    "chalk": "^4.1.0"
+  }
+}

test/esm/test-runner.mjs

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+import chalk from "chalk";
+
+export default async function testRunner({ title, testcases }) {
+  console.log(title);
+  const indent = "  ";
+  for (const [subtitle, testcase] of testcases) {
+    try {
+      await testcase();
+      console.log(chalk.green(indent + "✓ " + subtitle));
+    } catch (e) {
+      console.log(chalk.red(indent + "✗ " + subtitle));
+      console.error(e);
+    }
+  }
+}