add some babel config

.babelrc

@@ -13,6 +13,7 @@
   "plugins": [
     "@babel/plugin-proposal-object-rest-spread",
     "@babel/plugin-proposal-export-default-from",
-    "@babel/plugin-proposal-async-generator-functions"
+    "@babel/plugin-proposal-async-generator-functions",
+    "@babel/plugin-proposal-class-properties"
   ]
 }

src/@types/it-pb-rpc/index.d.ts

@@ -1,15 +0,0 @@
-declare module "it-pb-rpc" {
-  import { Buffer } from "buffer";
-  import { Duplex } from "it-pair";
-  type WrappedDuplex = {
-    read(bytes?: number): Promise<Buffer>;
-    readLP(): Promise<Buffer>;
-    write(input: Buffer): void;
-    writeLP(input: Buffer): void;
-    unwrap(): Duplex;
-  }
-
-  function Wrap (duplex: any): WrappedDuplex;
-
-  export = Wrap;
-}

tsconfig.json

@@ -16,6 +16,7 @@
     "**/src/**/*.ts"
   ],
   "exclude": [
-    "node_modules"
+    "node_modules",
+    "./src/@types"
   ]
 }