Convert @babel/core to TypeScript (#12929)

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

packages/babel-parser/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "include": [
+    "./typings"
+  ],
+  "references": [
+    {
+      "path": "../babel-code-frame"
+    },
+    {
+      "path": "../babel-helper-fixtures"
+    },
+    {
+      "path": "../babel-helper-validator-identifier"
+    }
+  ]
+}

packages/babel-parser/typings/babel-parser.d.ts

@@ -167,3 +167,8 @@ export interface RecordAndTuplePluginOptions {
 export interface FlowPluginOptions {
   all?: boolean;
 }
+
+export const tokTypes: {
+  // todo(flow->ts) real token type
+  [name: string]: any;
+};