chore: setup Yarn constraints (#13363)

packages/babel-code-frame/package.json

@@ -2,7 +2,7 @@
   "name": "@babel/code-frame",
   "version": "7.12.13",
   "description": "Generate errors that contain a code frame that point to source locations.",
-  "author": "Sebastian McKenzie <sebmck@gmail.com>",
+  "author": "The Babel Team (https://babel.dev/team)",
   "homepage": "https://babel.dev/docs/en/next/babel-code-frame",
   "bugs": "https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen",
   "license": "MIT",
@@ -14,7 +14,7 @@
     "url": "https://github.com/babel/babel.git",
     "directory": "packages/babel-code-frame"
   },
-  "main": "lib/index.js",
+  "main": "./lib/index.js",
   "dependencies": {
     "@babel/highlight": "workspace:^7.12.13"
   },
@@ -22,5 +22,8 @@
     "@types/chalk": "^2.0.0",
     "chalk": "^2.0.0",
     "strip-ansi": "^4.0.0"
+  },
+  "engines": {
+    "node": ">=6.9.0"
   }
 }