Workaround for deprecated grpc.load() method

Author: rsgowman

packages/firestore/package.json

@@ -30,6 +30,7 @@
     "@firebase/firestore-types": "1.1.1",
     "@firebase/logger": "0.1.10",
     "@firebase/webchannel-wrapper": "0.2.16",
+    "@grpc/proto-loader": "^0.4.0",
     "grpc": "1.19.0",
     "tslib": "1.9.3"
   },

packages/firestore/src/platform_node/load_protos.ts

@@ -15,15 +15,34 @@
  * limitations under the License.
  */
 
+import * as protoLoader from '@grpc/proto-loader';
 import * as grpc from 'grpc';
 import { resolve } from 'path';
+import * as ProtobufJS from 'protobufjs';
 
 /**
  * Loads the protocol buffer definitions for Firestore.
  *
  * @returns The GrpcObject representing our protos.
  */
 export function loadProtos(): grpc.GrpcObject {
+  const root = resolve(
+    __dirname,
+    process.env.FIRESTORE_PROTO_ROOT || '../protos'
+  );
+  const firestoreProtoFile = root + '/google/firestore/v1/firestore.proto';
+
+  // Beware that converting fields to camel case (the default behaviour with
+  // protoLoader) does not convert the tag fields in oneof groups (!!!). This
+  // will likely be fixed when we upgrade to protobufjs 6.x
+  const packageDefinition = protoLoader.loadSync(
+      firestoreProtoFile,
+      { longs: String, enums: String, defaults: true, oneofs: true, includeDirs: [root] });
+
+  return grpc.loadPackageDefinition(packageDefinition);
+}
+
+export function loadRawProtos(): any {
   const options = {
     // Beware that converting fields to camel case does not convert the tag
     // fields in oneof groups (!!!). This will likely be fixed when we upgrade
@@ -38,5 +57,8 @@ export function loadProtos(): grpc.GrpcObject {
     root,
     file: 'google/firestore/v1/firestore.proto'
   };
-  return grpc.load(firestoreProtoFile, /*format=*/ 'proto', options);
+
+  let builder = ProtobufJS.newBuilder(options);
+  builder = ProtobufJS.loadProtoFile(firestoreProtoFile, builder);
+  return builder.build();
 }