feat(provider): Added GoSquared provider (#341)

- **What kind of change does this PR introduce?**
Addition of [GoSquared](https://gosquared.com) to the providers

- **What is the current behavior? Link to open issue?**
N/A

- **What is the new behavior?**
GoSquared provider is added with unit tests for the core functionality.

src/lib/providers/gosquared/README.md

@@ -0,0 +1,12 @@
+<img 
+    src="../../../assets/svg/gosquared.svg" 
+    alt="GoSquared logo"
+    height="100px"
+    width="200px" />
+
+# GoSquared
+__homepage__: [www.gosquared.com](https://www.gosquared.com/)  
+__docs__: [gosquared.com/docs](https://gosquared.com/docs)  
+__import__: `import { Angulartics2GoSquared } from 'angulartics2/gosquared';`  
+
+## Setup

src/lib/providers/gosquared/gosquared.spec.ts

@@ -0,0 +1,114 @@
+import {
+  fakeAsync,
+  inject,
+  ComponentFixture,
+  TestBed,
+} from '@angular/core/testing';
+
+import { Angulartics2 } from 'angulartics2';
+import { advance, createRoot, RootCmp, TestModule } from '../../test.mocks';
+import { Angulartics2GoSquared } from './gosquared';
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 5000;
+declare var window: any;
+
+describe('Angulartics2GoSquared', () => {
+  let fixture: ComponentFixture<any>;
+  let _gs: any;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [TestModule],
+      providers: [Angulartics2GoSquared]
+    });
+
+    window._gs = _gs = jasmine.createSpy('_gs');
+    const provider: Angulartics2GoSquared = TestBed.get(Angulartics2GoSquared);
+    provider.startTracking();
+  });
+
+  it('should track pages', fakeAsync(
+    inject(
+      [Angulartics2, Angulartics2GoSquared],
+      (
+        angulartics2: Angulartics2,
+        angulartics2GoSquared: Angulartics2GoSquared
+      ) => {
+        fixture = createRoot(RootCmp);
+        angulartics2.pageTrack.next({ path: '/abc' });
+        advance(fixture);
+        expect(_gs).toHaveBeenCalledWith('track', '/abc');
+      }
+    )
+  ));
+
+  it('should track events', fakeAsync(
+    inject(
+      [Angulartics2, Angulartics2GoSquared],
+      (
+        angulartics2: Angulartics2,
+        angulartics2GoSquared: Angulartics2GoSquared
+      ) => {
+        fixture = createRoot(RootCmp);
+        angulartics2.eventTrack.next({
+          action: 'do',
+          properties: { category: 'cat' }
+        });
+        advance(fixture);
+        expect(_gs).toHaveBeenCalledWith('event', 'do', {
+          category: 'cat'
+        });
+      }
+    )
+  ));
+
+  it('should set user properties', fakeAsync(
+    inject(
+      [Angulartics2, Angulartics2GoSquared],
+      (
+        angulartics2: Angulartics2,
+        angulartics2GoSquared: Angulartics2GoSquared
+      ) => {
+        fixture = createRoot(RootCmp);
+        angulartics2.setUserProperties.next({
+          id: '1',
+          email: '1',
+          first_name: 'John',
+          last_name: 'Doe'
+        });
+        advance(fixture);
+        expect(_gs).toHaveBeenCalledWith('identify', {
+          id: '1',
+          email: '1',
+          first_name: 'John',
+          last_name: 'Doe'
+        });
+      }
+    )
+  ));
+
+  it('should set user properties once', fakeAsync(
+    inject(
+      [Angulartics2, Angulartics2GoSquared],
+      (
+        angulartics2: Angulartics2,
+        angulartics2GoSquared: Angulartics2GoSquared
+      ) => {
+        fixture = createRoot(RootCmp);
+        angulartics2.setUserPropertiesOnce.next({
+          id: '1',
+          email: '1',
+          first_name: 'John',
+          last_name: 'Doe'
+        });
+        advance(fixture);
+        expect(_gs).toHaveBeenCalledWith('identify', {
+          id: '1',
+          email: '1',
+          first_name: 'John',
+          last_name: 'Doe'
+        });
+      }
+    )
+  ));
+});

src/lib/providers/gosquared/gosquared.ts

@@ -0,0 +1,56 @@
+import { Injectable } from '@angular/core';
+
+import { Angulartics2 } from 'angulartics2';
+
+declare var _gs: any;
+
+@Injectable({ providedIn: 'root' })
+export class Angulartics2GoSquared {
+  constructor(private angulartics2: Angulartics2) {
+    this.angulartics2.setUserProperties.subscribe(x =>
+      this.setUserProperties(x),
+    );
+    this.angulartics2.setUserPropertiesOnce.subscribe(x =>
+      this.setUserProperties(x),
+    );
+  }
+
+  startTracking(): void {
+    this.angulartics2.pageTrack
+      .pipe(this.angulartics2.filterDeveloperMode())
+      .subscribe(x => this.pageTrack(x.path));
+    this.angulartics2.eventTrack
+      .pipe(this.angulartics2.filterDeveloperMode())
+      .subscribe(x => this.eventTrack(x.action, x.properties));
+  }
+
+  pageTrack(path: string) {
+    try {
+      _gs('track', path);
+    } catch (e) {
+      if (!(e instanceof ReferenceError)) {
+        throw e;
+      }
+    }
+  }
+
+  eventTrack(action: string, properties: any) {
+    try {
+      _gs('event', action, properties);
+    } catch (e) {
+      if (!(e instanceof ReferenceError)) {
+        throw e;
+      }
+    }
+  }
+
+  setUserProperties(properties: any) {
+    try {
+      _gs('identify', properties);
+    } catch (e) {
+      if (!(e instanceof ReferenceError)) {
+        throw e;
+      }
+    }
+  }
+}

src/lib/providers/gosquared/package.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "../../../../node_modules/ng-packagr/package.schema.json",
+  "name": "angulartics2/gosquared",
+  "description": "The gosquared module",
+  "homepage": "https://angulartics.github.io/angulartics2/",
+  "author": "Ben White <ben@benjackwhite.co.uk> (http://github.com/benjackwhite)",
+  "repository": "angulartics/angulartics2",
+  "license": "MIT",
+  "ngPackage": {
+    "lib": {
+      "entryFile": "gosquared.ts",
+      "umdModuleIds": {
+        "angulartics2": "angulartics2"
+      }
+    },
+    "dest": "../../../../dist/packages-dist/gosquared"
+  }
+}