Use ESM in Node.js code generation scripts (#2739)

package.json

@@ -18,9 +18,11 @@
     "@mapbox/mvt-fixtures": "3.10.0",
     "@octokit/plugin-retry": "^7.1.0",
     "@octokit/rest": "^20.1.0",
-    "@types/node": "^20.12.7",
+    "@types/argparse": "^2.0.16",
+    "@types/ejs": "^3.1.5",
+    "@types/node": "^20.16.1",
     "argparse": "^2.0.1",
-    "csscolorparser": "~1.0.3",
+    "csscolorparser": "^1.0.3",
     "d3-queue": "3.0.7",
     "diff": "5.2.0",
     "ejs": "^3.1.10",
@@ -42,5 +44,6 @@
     "typescript": "^5.4.5",
     "xcode": "^3.0.1"
   },
-  "scripts": {}
+  "scripts": {},
+  "type": "module"
 }