feat: return empty functions if analytics disabled

Author: Rokas Lengvenis

src/index.js

@@ -79,11 +79,22 @@ async function eventHandle(track, key, e) {
 }
 
 // Export out init() function that kicks everything off
-export default function init(key) {
+export default function init(key, config) {
   if (!key) {
     throw new Error('A segment key must be passed to init');
   }
 
+  // If analytics are explicitly disabled
+  if (config && config.disableBrowserAnalytics) {
+    return {
+      track: () => {},
+      identify: () => {},
+      page: () => {},
+      group: () => {},
+      alias: () => {},
+    };
+  }
+
   const track = trackFactory(key);
 
   // Listen to all click events in a page and track if enabled

src/index.test.js

@@ -52,4 +52,16 @@ describe('init', () => {
     expect(spy).toHaveBeenCalled();
     expect(spy.mock.calls[0][0]).toEqual('click');
   });
+
+  it('should return empty functions in case analytics are disabled', () => {
+    const { track, identify, page, group, alias } = init(KEY, {
+      disableBrowserAnalytics: true,
+    });
+
+    expect(track()).toBeUndefined();
+    expect(identify()).toBeUndefined();
+    expect(page()).toBeUndefined();
+    expect(group()).toBeUndefined();
+    expect(alias()).toBeUndefined();
+  });
 });