Check if Office.js is loaded outside of Office client

If we load a webpage referencing office.js outside Office client, we will get a warning: Office.js is loaded outside of Office client.

This information is useful.

Does anyone know if there is an API to check that inside my code?

Edit 1:

I explain a little bit my scenario and why I ask this question. I am making an application with angularjs which can be loaded in a browser as a web page or in Office as an add-in. And I realise that we should not do <body ng-app="myApp"> and angular.bootstrap(document, ['myApp']) together, otherwise controllers will execute twice. So I decided to not write <body ng-app="myApp"> and always use angular.bootstrap in both cases (ie, web page & add-in).

So for a web page, I could write:

$(document).ready(function () {
    angular.bootstrap(document, ['myApp'])  
})

app = angular.module('myApp', ['ui.router', 'ui.bootstrap'])
...

So for a web page, I need to write angular.bootstrap inside Office.initialize, and share other code with the case of add-in:

Office.initialize = function (reason) {
    $(document).ready(function () {
        angular.bootstrap(document, ['myApp'])
    });
}

app = angular.module('myApp', ['ui.router', 'ui.bootstrap'])
// share the same code

However, if I write these two cases together as follows, it works for a web page, whereas I gives Error: ng:btstrpd App Already Bootstrapped with this Element for add-in.

$(document).ready(function () {
    angular.bootstrap(document, ['myApp'])
    console.log("bootstrapped outside Office.initialize")   
})

Office.initialize = function (reason) {
    $(document).ready(function () {
        angular.bootstrap(document, ['myApp'])
        console.log("bootstrapped inside Office.initialize")
    })
}

app = angular.module('myApp', ['ui.router', 'ui.bootstrap']).

If I set a flag, console will display bootstrapped outside Office.initialize followed by isBootstrapped, then running the code will show that Office.context or Office.context.document is undefined:

var isBootstrapped = false;

$(document).ready(function () {
    angular.bootstrap(document, ['myApp'])
    isBootstrapped = true
    console.log("bootstrapped outside Office.initialize")
})

Office.initialize = function (reason) {
    $(document).ready(function () {
        if (isBootstrapped) console.log("isBootstrapped")
        else {
            angular.bootstrap(document, ['myApp'])
            console.log("bootstrapped inside Office.initialize")
        }
    })
}

app = angular.module('myApp', ['ui.router', 'ui.bootstrap'])

So I really need an efficient way to check if Office.js is loaded outside of Office client (ie, whether it is a web page or an add-in), to decide which piece of angular.bootstrap should be executed.

Solution

One way is to use https://github.com/OfficeDev/office-js-helpers.

Both OfficeHelpers.Utilities.host and OfficeHelpers.Utilities.platform provide useful information.