fix(deps): drop dependency on through2 (#457)

Author: JustinBeckwith

handwritten/datastore/package.json

@@ -57,8 +57,7 @@
     "google-gax": "^1.0.0",
     "is": "^3.3.0",
     "split-array-stream": "^2.0.0",
-    "stream-events": "^1.0.5",
-    "through2": "^3.0.1"
+    "stream-events": "^1.0.5"
   },
   "devDependencies": {
     "@types/extend": "^3.0.1",
@@ -68,7 +67,6 @@
     "@types/ncp": "^2.0.1",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "^7.0.11",
-    "@types/through2": "^2.0.34",
     "@types/tmp": "0.1.0",
     "assert-rejects": "^1.0.0",
     "codecov": "^3.5.0",

handwritten/datastore/src/request.ts

@@ -22,7 +22,6 @@ const concat = require('concat-stream');
 import * as extend from 'extend';
 import {split} from 'split-array-stream';
 import * as streamEvents from 'stream-events';
-import * as through from 'through2';
 import {google} from '../proto/datastore';
 import {CallOptions} from 'google-gax';
 import {Transform} from 'stream';
@@ -302,7 +301,7 @@ class DatastoreRequest {
       );
     };
 
-    const stream = streamEvents(through.obj());
+    const stream = streamEvents(new Transform({objectMode: true}));
     stream.once('reading', () => {
       makeRequest(keys);
     });
@@ -778,7 +777,7 @@ class DatastoreRequest {
       });
     }
 
-    const stream = streamEvents(through.obj());
+    const stream = streamEvents(new Transform({objectMode: true}));
     stream.once('reading', () => {
       makeRequest(query);
     });

handwritten/datastore/test/request.ts

@@ -18,11 +18,10 @@ import * as pjy from '@google-cloud/projectify';
 import * as pfy from '@google-cloud/promisify';
 import * as assert from 'assert';
 import * as extend from 'extend';
-import {CallOptions} from '@grpc/grpc-js';
 import * as is from 'is';
 import * as proxyquire from 'proxyquire';
 import * as sinon from 'sinon';
-import * as through from 'through2';
+import {Transform} from 'stream';
 
 import {google} from '../proto/datastore';
 import * as ds from '../src';
@@ -367,12 +366,11 @@ describe('Request', () => {
 
       it('should end stream', done => {
         const stream = request.createReadStream(key);
-
         stream
           .on('data', () => {})
           .on('error', () => {
             setImmediate(() => {
-              assert.strictEqual((stream as Any)._destroyed, true);
+              assert.strictEqual(stream.destroyed, true);
               done();
             });
           });
@@ -604,7 +602,7 @@ describe('Request', () => {
 
       beforeEach(() => {
         request.createReadStream = sandbox.spy(() => {
-          const stream = through.obj();
+          const stream = new Transform({objectMode: true});
           setImmediate(() => {
             fakeEntities.forEach(entity => stream.push(entity));
             stream.push(null);
@@ -656,7 +654,7 @@ describe('Request', () => {
 
       beforeEach(() => {
         request.createReadStream = sandbox.spy(() => {
-          const stream = through.obj();
+          const stream = new Transform({objectMode: true});
           setImmediate(() => {
             stream.emit('error', error);
           });
@@ -1081,7 +1079,7 @@ describe('Request', () => {
 
       beforeEach(() => {
         request.runQueryStream = sandbox.spy(() => {
-          const stream = through.obj();
+          const stream = new Transform({objectMode: true});
 
           setImmediate(() => {
             stream.emit('info', fakeInfo);
@@ -1139,7 +1137,7 @@ describe('Request', () => {
 
       beforeEach(() => {
         request.runQueryStream = sandbox.spy(() => {
-          const stream = through.obj();
+          const stream = new Transform({objectMode: true});
 
           setImmediate(() => {
             stream.emit('error', error);