feat: support deprecatedOnly option to make deprecated fields optional

integration/use-optionals-deprecated-only/optionals-test.ts

@@ -0,0 +1,56 @@
+import { OptionalsTest, StateEnum } from './test'
+
+describe('useOptionals=deprecatedOnly', () => {
+  it('has deprecated fields optional members', () => {
+    const test: OptionalsTest = {
+      id: 1,
+      long: 10,
+      repId: [1, 2],
+      repStateV2: [StateEnum.ON, StateEnum.OFF],
+      repLong: [11, 12],
+      repTruth: [true, false],
+      repDescription: ["hello", "world"],
+      repData: [Buffer.alloc(3).fill(0x33), Buffer.alloc(4).fill(0x34), Buffer.alloc(5).fill(0x35)],
+
+      optId: 2,
+      optLong: 13,
+      optTruth: true,
+      optDescription: "mumble",
+      optData: Buffer.alloc(6).fill(0x36),
+
+      translations: {
+        "hello": "hallo",
+        "world": "wereld",
+      },
+    };
+    const data = OptionalsTest.encode(test).finish();
+    const test2 = OptionalsTest.decode(data);
+    expect(test2).toEqual({
+      id: 1,
+      state: StateEnum.UNKNOWN,
+      long: 10,
+      truth: false,
+      description: "",
+      data: new Uint8Array(0),
+
+      repId: [1, 2],
+      repState: [],
+      repStateV2: [StateEnum.ON, StateEnum.OFF],
+      repLong: [11, 12],
+      repTruth: [true, false],
+      repDescription: ["hello", "world"],
+      repData: [Buffer.alloc(3).fill(0x33), Buffer.alloc(4).fill(0x34), Buffer.alloc(5).fill(0x35)],
+
+      optId: 2,
+      optLong: 13,
+      optTruth: true,
+      optDescription: "mumble",
+      optData: Buffer.alloc(6).fill(0x36),
+
+      translations: {
+        "hello": "hallo",
+        "world": "wereld",
+      },
+    });
+  });
+})

integration/use-optionals-deprecated-only/parameters.txt

@@ -0,0 +1 @@
+useOptionals=deprecatedOnly

integration/use-optionals-deprecated-only/test.proto

@@ -0,0 +1,35 @@
+syntax = "proto3";
+package optionalstest;
+
+message OptionalsTest {
+  int32 id = 1;
+  StateEnum state = 2 [deprecated = true];
+  int64 long = 3;
+  bool truth = 4 [deprecated = true];
+  string description = 5 [deprecated = true];
+  bytes data = 6 [deprecated = true];
+
+  repeated int32 rep_id = 7;
+  repeated StateEnum rep_state = 8 [deprecated = true];
+  repeated StateEnum rep_state_v2 = 9;
+  repeated int64 rep_long = 10;
+  repeated bool rep_truth = 11;
+  repeated string rep_description = 12;
+  repeated bytes rep_data = 13;
+
+  optional int32 opt_id = 14;
+  optional StateEnum opt_state = 15 [deprecated = true];
+  optional int64 opt_long = 16;
+  optional bool opt_truth = 17;
+  optional string opt_description = 18;
+  optional bytes opt_data = 19;
+
+  map<string, string> translations = 20;
+}
+
+enum StateEnum {
+  option deprecated = true;
+  UNKNOWN = 0;
+  ON = 1;
+  OFF = 2;
+}