feat: support optional proto3 fields for grpc (#165)

Upgrading ts-protoc-gen allowed TS protos to compile, but was
insufficient to get grpc codegen working; for that, we need to upgrade a
few other things.

Also add a test to assert that codegen works for protos with `optional`
fields.

Author: sxlijin

WORKSPACE

@@ -21,10 +21,10 @@ http_archive(
 
 http_archive(
     name = "rules_proto",
-    sha256 = "aa1ee19226f707d44bee44c720915199c20c84a23318bb0597ed4e5c873ccbd5",
-    strip_prefix = "rules_proto-40298556293ae502c66579620a7ce867d5f57311",
+    sha256 = "c22cfcb3f22a0ae2e684801ea8dfed070ba5bed25e73f73580564f250475e72d",
+    strip_prefix = "rules_proto-4.0.0-3.19.2",
     urls = [
-        "https://github.com/bazelbuild/rules_proto/archive/40298556293ae502c66579620a7ce867d5f57311.tar.gz",
+        "https://github.com/bazelbuild/rules_proto/archive/refs/tags/4.0.0-3.19.2.tar.gz",
     ],
 )
 

package.json

@@ -4,22 +4,22 @@
   "repository": "https://github.com/Dig-Doug/rules_typescript_proto",
   "license": "Apache-2.0",
   "dependencies": {
-    "google-protobuf": "3.12.2"
+    "google-protobuf": "3.15.5"
   },
   "devDependencies": {
     "@bazel/concatjs": "3.0.0",
     "@bazel/jasmine": "3.0.0",
     "@bazel/rollup": "3.0.0",
     "@bazel/typescript": "3.0.0",
     "@grpc/grpc-js": "1.2.1",
-    "@improbable-eng/grpc-web": "0.13.0",
-    "@types/google-protobuf": "3.7.2",
+    "@improbable-eng/grpc-web": "0.15.0",
+    "@types/google-protobuf": "3.15.5",
     "@types/jasmine": "3.5.11",
     "@types/node": "12.12.50",
     "c8": "^7.10.0",
     "clang-format": "1.4.0",
     "grpc": "1.24.9",
-    "grpc-tools": "1.10.0",
+    "grpc-tools": "1.11.2",
     "husky": "4.2.5",
     "jasmine": "^3.10.0",
     "jasmine-core": "^3.10.1",

test/proto/pizza_service.proto

@@ -13,6 +13,7 @@ service PizzaService {
 message OrderPizzaRequest {
   // The list of pizzas to order.
   repeated Pizza pizzas = 1;
+  optional string toppings = 2;
 }
 
 message OrderPizzaResponse {