Mapping already loaded JavaScript

[achim.has...@gmail.com]

I have a 3rd party TypeScript library that loads an external JavaScript library using SystemJS. In my case it is loading moment.js, a popular date library.

I already bundle moment.js in a combined script called scripts.js which I load before SystemJS with a simple <script>. This has all my legacy external JS libraries.

Now SystemJS errors out when it tries to load "moment". I somehow need to map this request in SystemJS to "null" so it doesn't do anything because it's already loaded. How can that be achieved?

I'm also not sure about the namespace, would SystemJS do anything to moment when importing it or just load it?

[Guy Bedford]

You can do this empty mapping by `System.config({ map: { 'moment': '@empty' } })` and then just use the global value for `moment` directly in the modules.

Alternatively create an alias module `moment.js` that contains `module.exports = window.moment` say. Then create a map to that alias module - `map: { 'moment': 'path/to/moment.js' }`.

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