setXX() method return type is wrong in .d.ts file

[DRL9]

Versions of relevant software used google-protobuf: 3.17.3 ts-protoc-gen: 0.15.0

What happened .d.ts file setXX() and addXXs() return type are wrong

What you expected to happen That method should return this replace void

How to reproduce it (as minimally and precisely as possible):

syntax = "proto3";

package pd;

message Test {
  string a_string = 1;
  repeated string a_array = 2;
}

output js code segment

/**
 * @param {string} value
 * @return {!proto.pd.Test} returns this
 */
proto.pd.Test.prototype.setAString = function(value) {
  return jspb.Message.setProto3StringField(this, 1, value);
};

/**
 * @param {!Array<string>} value
 * @return {!proto.pd.Test} returns this
 */
proto.pd.Test.prototype.setAArrayList = function(value) {
  return jspb.Message.setField(this, 2, value || []);
};

/**
 * @param {string} value
 * @param {number=} opt_index
 * @return {!proto.pd.Test} returns this
 */
proto.pd.Test.prototype.addAArray = function(value, opt_index) {
  return jspb.Message.addToRepeatedField(this, 2, value, opt_index);
};

output .d.ts segment

setAString(value: string): void;

setAArrayList(value: Array<string>): void;
addAArray(value: string, index?: number): string;

google-protobuf marked the return type of these method as this. However, output'ssetX() return void, and addXX() return the inputValue's type.

I expect to generate the following code:

setAString(value: string): this;

setAArrayList(value: Array<string>): this;
addAArray(value: string, index?: number): this;

[DRL9]

duplicated #218