Exploring the world of external libraries with NPM in Angular 2 using TypeScript

I am currently utilizing Ionic2 (Browserify) and Typescript with NPM.

I have been exploring how typescript compiles the code into bundles and what gets included in the bundle. I noticed that some of my node require files are referenced automatically, while others require manual script tag additions.

It appears that dependencies like jquery require manual script tags, whereas libraries like lodash are resolved seamlessly and bundled without any extra steps.

What determines the correct referencing of files during the typescript compilation process, and what needs to be handled outside of it?

For instance, in my typescript setup:

import * as jQuery from 'jquery';
-- requires manual script tag addition in index.html

import * as _ from 'lodash'; -- does not need a script tag - it is added automatically

You can see in the image below that some libraries are loaded while others from the node_modules folder are not.

https://i.sstatic.net/5O7vI.png

Is there something specific to the Ionic platform bundling that I might be overlooking?

Thank you!

Package JSON content below:

{
  "name": "ionic-conference-app",
  "description": "Ionic Conference App",
   ...
}

Standard Ionic2 Gulpfile:

var gulp = require('gulp'),
    gulpWatch = require('gulp-watch'),
   ...
}

Answer №1

The issue may arise from the absence of a proper utilization of the jQuery import. When TypeScript encounters this situation, it may not emit a require call - leading to exclusion of the jquery module from the bundle. To address this, consider using the following import syntax:

import 'jquery';

Dive into the discussion on this TypeScript feature in this GitHub thread.

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