Definition for TypeScript for an individual JavaScript document

I am currently attempting to integrate an Ionic2 app within a Movilizer HTML5 view. To facilitate communication between the Movilizer container client and the Ionic2 app, it is crucial to incorporate a plugins/Movilizer.js file. The functionality of this file will be replaced by the Movilizer system with a fully implemented version. Below is the content of the initial file:

//File location: src/plugins/Movilizer.js
var Movilizer = function() {};

Movilizer.prototype.readGlobalVariable = function(varName, successCB, errorCB)
{
    result = "Hello World";
    successCB(result);
}

var movilizer = new Movilizer();

In order to utilize the Movilizer interface in my TypeScript code, I understand that creating a Movilizer.d.ts definition file is necessary. However, I am encountering difficulties in this process. The following approach was attempted:

//File location: src/plugins/Movilizer/index.d.ts
//Also attempted at: src/plugins/Movilizer.d.ts
export = Movilizer;

declare class Movilizer {
    constructor();

    readGlobalVariable(key: string, onSuccess: (value: string) => void, onError: () => void): void;
}

Additionally, I attempted to reference the .d.ts file within my tsconfig.json without any observed changes:

//File location: tsconfig.json
(...)
"files": [
    "src/plugins/Movilizer/index.d.ts"
],
(...)

The usage of the file within my FooPage TypeScript file looks like this and successfully compiles:

//File location: src/pages/foo/foo.ts
import {Component} from '@angular/core';
import {NavController} from 'ionic-angular';
import Movilizer from '../../plugins/Movilizer';

@Component({
    selector: 'page-foo',
    templateUrl: 'foo.html'
})
export class FooPage {

    constructor(public navCtrl: NavController) {
        new Movilizer().readGlobalVariable("myGlobalVariable", (result) => {
            console.log('readGlobalVariable Success: ' + result);
        }, () => {
            console.log('readGlobalVariable Failure!');
        });
    }

}

During testing of the application using the command $ ionic serve, an immediate crash occurs with the subsequent error message:

EXCEPTION: Error in ./FooPage class FooPage_Host - inline template:0:0 caused by: __WEBPACK_IMPORTED_MODULE_2__plugins_Movilizer___default.a is not a constructor
ErrorHandler.prototype.handleError
_callAndReportToErrorHandler/<
sg</d</t.prototype.invoke
NgZone.prototype.forkInnerZoneWithAngularBehavior/this.inner<.onInvoke
sg</d</t.prototype.invoke
sg</v</e.prototype.run
h/<
sg</d</t.prototype.invokeTask
NgZone.prototype.forkInnerZoneWithAngularBehavior/this.inner<.onInvokeTask
sg</d</t.prototype.invokeTask
sg</v</e.prototype.runTask
i
mh/</u
mh/<
Vl/r 

My Inquiry
How can I effectively implement the Movilizer.js file into my TypeScript files? Should I create a .d.ts file, what is the correct procedure for doing so?

Answer №1

It's interesting to note that the code in Movilizer.js does not include an export, indicating that it is not a module. Therefore, you won't be able to use the import statement with it.

If you want to use this file in the browser, you can load it as a script instead of as a module (for example, by including it with the <script> tag in your markup). This way, it will exist as a global variable. In TypeScript, the file Movilizer/index.d.ts likely declares this global variable, allowing you to simply utilize it.

For further information:

  • Here are some distinctions between using modules and scripts;
  • Perhaps you could incorporate Movilizer.js into your Webpack bundle using something like the expose loader?

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