CODEWITHSUNDEEP
typescript
Dawid Zbiński
Dawid Zbiński

Reputation: 5826

Creating global variable in TypeScript

I've been working on a small "library" that I would use for Http requests. It's written in TypeScript and it has one primary class which is Http. I'd like to be able to use this class in my ordinary JavaScript after including my compiled bundle, so I'm thinking about the way to make it globally available.

I'm using gulp-tsify as a compiler and it does compile my TypeScript into the es5 bundle, which is great, but in a different scope as a self-invoking function. When I rewrite my bundle after it's compiled (code below) it works fine, but how to achieve that without rewriting the bundle script?

What I mean is... my compiled TypeScript looks like this:

(function e(t,n,r){ ... })(function(require, module, exports){
    ...
    // Somewhere here I've got var Http_1 = require('/...');
}, n, r)
// console.log(Http_1) -> undefined

when I declare the global http like that (manually)...

var http;
(function e(t,n,r){
    ...
})(function(require, module, exports){
    ...
    // Somewhere here I've got var Http_1 = require('/...')
    http = Http_1;
    // or I can do this without the Http_1
    http = require('./classes/Http');
}, n, r)
// console.log(http) -> everything's fine

... the user is able to use the http object, but I want it to be automatically done by the compiler.

I was thinking about something like declare var http = Http; inside TypeScript, but I'm unable to achieve that because the Initializers are not allowed in ambient contexts. Any thoughts on how it could be done? Thank you.

Upvotes: 3

Views: 1725

Answers (2)

Kevin Beal
Kevin Beal

Reputation: 10858

Use the special global syntax:

declare global {
    interface Window {
        you: IAreCookingWithFire;
    }

    var you: IAreCookingWithFire;
}

Upvotes: 1

Martin
Martin

Reputation: 16300

To add a browser global simply attach the item to the window object. 

window['Http'] = Http;

Upvotes: 1

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