Use top-evel Babel deps to build babel-helpers

packages/babel-helpers/scripts/generate-helpers.js

@@ -3,8 +3,7 @@ import fs from "fs";
 import { join } from "path";
 import { URL, fileURLToPath } from "url";
 import { minify } from "terser";
-import { transformSync } from "@babel/core";
-import presetTypescript from "@babel/preset-typescript";
+import { babel, presetTypescript } from "$repo-utils/babel-top-level";
 import { gzipSync } from "zlib";
 import { IS_BABEL_8 } from "$repo-utils";
 
@@ -59,7 +58,7 @@ export default Object.freeze({
     const mangleFns = code.includes("@mangleFns");
     const noMangleFns = [];
 
-    code = transformSync(code, {
+    code = babel.transformSync(code, {
       configFile: false,
       babelrc: false,
       filename: filePath,

scripts/repo-utils/babel.js

@@ -0,0 +1,2 @@
+export * as babel from "@babel/core";
+export { default as presetTypescript } from "@babel/preset-typescript";

scripts/repo-utils/package.json

@@ -1,4 +1,8 @@
 {
   "type": "module",
-  "main": "index.cjs"
+  "main": "index.cjs",
+  "exports": {
+    ".": "./index.cjs",
+    "./babel-top-level": "./babel.js"
+  }
 }