Convert @babel/traverse to TypeScript (#12488)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

packages/babel-traverse/scripts/generators/asserts.js

@@ -0,0 +1,26 @@
+"use strict";
+const t = require("@babel/types");
+
+module.exports = function generateAsserts() {
+  let output = `/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'make build'
+ */
+import * as t from "@babel/types";
+import NodePath from "../index";
+
+
+export interface NodePathAssetions {`;
+
+  for (const type of t.TYPES) {
+    output += `
+  assert${type}(
+    opts?: object,
+  ): asserts this is NodePath<t.${type}>;`;
+  }
+
+  output += `
+}`;
+
+  return output;
+};