Incorporating a particular JavaScript library into Angular 4 (in case the library doesn't have a variable export)

I am attempting to display the difference between two JSON objects in an Angular 4 view. I have been using a library called angular-object-diff, which was originally created for AngularJS.

You can view a demo of this library here: Link

I have tried to import the JS library by referencing this file: angular-object-diff.js, however it does not export a variable.
In my typings.d.ts file, I included the following:

declare var ObjectDiff: any;


In my angular-cli.json configuration, I added the following:

"scripts": [
    "../node_modules/angular-object-diff/dist/angular-object-diff.js"
  ],

In my component file:

const json1 = {
  name: 'John'
};
const json2 = {
  name: 'Johnny'
};
const diff = ObjectDiff.diffOwnProperties(json1, json2);
this.jsonViewData = ObjectDiff.toJsonDiffView(diff);

In my view:

<pre ng-bind-html="jsonViewData"></pre>
<pre> {{jsonViewData}}</pre>

Despite my efforts, I am encountering an error stating that "ObjectDiff" is not defined in the console.

If anyone could provide insight on where I may be going wrong or offer suggestions for displaying the JSON diff, it would be greatly appreciated :)

** Thank you

jsonangulartypescripttypescript-typings

Answer №1

The software library does not have any exports in order to prevent global scope contamination with local variables. The use of an IIFE ensures that the local variables cannot be accessed from outside, which is why the Module pattern is both effective and sometimes frustrating.

One issue with the library is its reliance on the AngularJS global variable angular, assuming that it will always be present. This poses a problem for newer versions like Angular 4, where mocking the angular global becomes necessary. Furthermore, the code makes use of AngularJS-specific components such as the $sce service.

To address these issues, the library should be forked and modified accordingly to remove all references to angular. Since the script will be executed within a module scope, the IIFE can be eliminated and proper exports should be included instead.

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