fix: generate canonical JSON encoding for FieldMasks (#510)

* fix: generate canonical JSON encoding for FieldMasks

* rm pb.js-dependency, make sub-tests self-contained

integration/fieldmask/fieldmask-test.ts

@@ -0,0 +1,27 @@
+import { FieldMaskMessage } from './fieldmask';
+
+let data = {
+  fieldMask: 'a,b,c.d',
+};
+
+describe('fieldmask', () => {
+  it('can decode JSON', () => {
+    const f = FieldMaskMessage.fromJSON(data);
+    expect(f).toMatchInlineSnapshot(`
+      Object {
+        "fieldMask": Object {
+          "paths": Array [
+            "a",
+            "b",
+            "c.d",
+          ],
+        },
+      }
+    `);
+  });
+
+  it('can encode JSON', () => {
+    const f = FieldMaskMessage.toJSON({ fieldMask: { paths: ['a', 'b', 'c.d'] } });
+    expect(f).toEqual(data);
+  });
+});

integration/fieldmask/fieldmask.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+import "google/protobuf/field_mask.proto";
+
+message FieldMaskMessage {
+  google.protobuf.FieldMask field_mask = 1;
+}

integration/fieldmask/fieldmask.ts

@@ -0,0 +1,88 @@
+/* eslint-disable */
+import { util, configure, Writer, Reader } from 'protobufjs/minimal';
+import * as Long from 'long';
+import { FieldMask } from './google/protobuf/field_mask';
+
+export const protobufPackage = '';
+
+export interface FieldMaskMessage {
+  fieldMask: FieldMask | undefined;
+}
+
+function createBaseFieldMaskMessage(): FieldMaskMessage {
+  return { fieldMask: undefined };
+}
+
+export const FieldMaskMessage = {
+  encode(message: FieldMaskMessage, writer: Writer = Writer.create()): Writer {
+    if (message.fieldMask !== undefined) {
+      FieldMask.encode(message.fieldMask, writer.uint32(10).fork()).ldelim();
+    }
+    return writer;
+  },
+
+  decode(input: Reader | Uint8Array, length?: number): FieldMaskMessage {
+    const reader = input instanceof Reader ? input : new Reader(input);
+    let end = length === undefined ? reader.len : reader.pos + length;
+    const message = createBaseFieldMaskMessage();
+    while (reader.pos < end) {
+      const tag = reader.uint32();
+      switch (tag >>> 3) {
+        case 1:
+          message.fieldMask = FieldMask.decode(reader, reader.uint32());
+          break;
+        default:
+          reader.skipType(tag & 7);
+          break;
+      }
+    }
+    return message;
+  },
+
+  fromJSON(object: any): FieldMaskMessage {
+    return {
+      fieldMask: isSet(object.fieldMask) ? { paths: object.fieldMask.split(',') } : undefined,
+    };
+  },
+
+  toJSON(message: FieldMaskMessage): unknown {
+    const obj: any = {};
+    message.fieldMask !== undefined && (obj.fieldMask = message.fieldMask.paths.join());
+    return obj;
+  },
+
+  fromPartial<I extends Exact<DeepPartial<FieldMaskMessage>, I>>(object: I): FieldMaskMessage {
+    const message = createBaseFieldMaskMessage();
+    message.fieldMask =
+      object.fieldMask !== undefined && object.fieldMask !== null ? FieldMask.fromPartial(object.fieldMask) : undefined;
+    return message;
+  },
+};
+
+type Builtin = Date | Function | Uint8Array | string | number | boolean | undefined;
+
+export type DeepPartial<T> = T extends Builtin
+  ? T
+  : T extends Array<infer U>
+  ? Array<DeepPartial<U>>
+  : T extends ReadonlyArray<infer U>
+  ? ReadonlyArray<DeepPartial<U>>
+  : T extends {}
+  ? { [K in keyof T]?: DeepPartial<T[K]> }
+  : Partial<T>;
+
+type KeysOfUnion<T> = T extends T ? keyof T : never;
+export type Exact<P, I extends P> = P extends Builtin
+  ? P
+  : P & { [K in keyof P]: Exact<P[K], I[K]> } & Record<Exclude<keyof I, KeysOfUnion<P>>, never>;
+
+// If you get a compile-error about 'Constructor<Long> and ... have no overlap',
+// add '--ts_proto_opt=esModuleInterop=true' as a flag when calling 'protoc'.
+if (util.Long !== Long) {
+  util.Long = Long as any;
+  configure();
+}
+
+function isSet(value: any): boolean {
+  return value !== null && value !== undefined;
+}