Export babel tooling packages in @babel/standalone (#11696)

Co-authored-by: Nicolò Ribaudo <hello@nicr.dev>

packages/babel-standalone/package.json

@@ -11,6 +11,8 @@
   ],
   "devDependencies": {
     "@babel/core": "workspace:^",
+    "@babel/generator": "workspace:^",
+    "@babel/parser": "workspace:^",
     "@babel/plugin-external-helpers": "workspace:^",
     "@babel/plugin-proposal-decorators": "workspace:^",
     "@babel/plugin-proposal-destructuring-private": "workspace:^",
@@ -116,6 +118,9 @@
     "@babel/preset-flow": "workspace:^",
     "@babel/preset-react": "workspace:^",
     "@babel/preset-typescript": "workspace:^",
+    "@babel/template": "workspace:^",
+    "@babel/traverse": "workspace:^",
+    "@babel/types": "workspace:^",
     "acorn": "^8.7.0",
     "jsdom": "^22.1.0"
   },

packages/babel-standalone/src/index.ts

@@ -30,6 +30,8 @@ import type { InputOptions } from "@babel/core";
 
 import { runScripts } from "./transformScriptTags.ts";
 
+export * as packages from "./packages.ts";
+
 // We import this file from another package using a relative path because it's
 // meant to just be build-time script; it's ok because @babel/standalone is
 // bundled anyway.

packages/babel-standalone/src/packages.ts

@@ -0,0 +1,5 @@
+export * as generator from "@babel/generator";
+export * as parser from "@babel/parser";
+export * as template from "@babel/template";
+export * as traverse from "@babel/traverse";
+export * as types from "@babel/types";

packages/babel-standalone/test/babel.js

@@ -8,6 +8,26 @@ describe("@babel/standalone", () => {
     Babel = require("../babel.js");
   });
 
+  describe("export packages", () => {
+    it("list", () => {
+      expect(Object.keys(Babel.packages)).toMatchInlineSnapshot(`
+        Array [
+          "generator",
+          "parser",
+          "template",
+          "traverse",
+          "types",
+        ]
+      `);
+    });
+
+    it("they work", () => {
+      const generate = Babel.packages.generator.default;
+      const parser = Babel.packages.parser;
+      expect(generate(parser.parse("foo")).code).toBe("foo;");
+    });
+  });
+
   it("handles the es2015-no-commonjs preset", () => {
     const output = Babel.transform('const getMessage = () => "Hello World"', {
       presets: ["es2015-no-commonjs"],

yarn.lock

@@ -4176,6 +4176,8 @@ __metadata:
   resolution: "@babel/standalone@workspace:packages/babel-standalone"
   dependencies:
     "@babel/core": "workspace:^"
+    "@babel/generator": "workspace:^"
+    "@babel/parser": "workspace:^"
     "@babel/plugin-external-helpers": "workspace:^"
     "@babel/plugin-proposal-decorators": "workspace:^"
     "@babel/plugin-proposal-destructuring-private": "workspace:^"
@@ -4281,6 +4283,9 @@ __metadata:
     "@babel/preset-flow": "workspace:^"
     "@babel/preset-react": "workspace:^"
     "@babel/preset-typescript": "workspace:^"
+    "@babel/template": "workspace:^"
+    "@babel/traverse": "workspace:^"
+    "@babel/types": "workspace:^"
     acorn: "npm:^8.7.0"
     jsdom: "npm:^22.1.0"
   languageName: unknown