JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="app">
    <div ng-controller="ctrlA">
    </div>
    <div ng-controller="ctrlB">
    </div>
</div>

JavaScript

var app = angular.module('app',
    [
    ]);

app.service('sharedService', [function () {
    this.someValue = 'yo!'
}]);

app.controller('ctrlB', ['$scope', 'sharedService', function($scope, sharedService) {
    console.log(sharedService.someValue)
}]);

app.controller('ctrlA', ['$scope', 'sharedService', function($scope, sharedService) {
    console.log(sharedService.someValue)
}]);