Using an External JavaScript Library in TypeScript and Angular 4: A Comprehensive Guide

My current project involves implementing Google Login and Jquery in Typescript. I have ensured that the necessary files are included in the project: jquery.min and the import of Google using 

<script defer src="https://apis.google.com/js/platform.js"></script>

In my component, I have added the following:

declare var gapi: any;
declare var $: any;

Despite this, I continue to encounter an error when running ng serve:

The error message states "Cannot find namespace 'gapi'."

Could anyone provide guidance on properly referencing or importing external JavaScript libraries/namespaces/functions in Angular 4 with Typescript?

javascriptangulartypescript

Answer №1

One way to enhance your project is by installing third-party libraries locally. An example of this in action is:

npm i jquery --save

For Angular CLI projects, the config file .angular-cli.json plays a significant role. By adding jquery to the scripts section within this file, you can make it accessible globally for your application. Here's a sample configuration:

"scripts": [

"../node_modules/jquery/dist/jquery.js"

Additionally, consider installing type definition files when they are provided. Doing so eliminates the need to declare variables of type any. An installation command could look like this:

npm i @types/jquery --save-dev

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