How to use collections.js in typescript?

Question

I want to use collections.js in my typescript Angular2 project. I want to start with multimap. There's no @types/collections package and there's no collections.js in typings.

When I write

const MultiMap = require('collections/multi-map')

I got "NoProviderError for PlatformRef" in Agnular2.

Yes, that's where I started. @types/collections is not in the npm registry. — norekhov
– norekhov, Commented Mar 23, 2017 at 9:52
Do you also have a definition for require function somewhere? — eur00t
– eur00t, Commented Mar 23, 2017 at 10:30
No, I dont think so. I'm using github.com/AngularClass/angular2-webpack-starter as a startet kit. — norekhov
– norekhov, Commented Mar 23, 2017 at 10:31
Yes, I can see that they include "node" typings in their tsconfig.json — eur00t
– eur00t, Commented Mar 23, 2017 at 10:36
I dont understand why I getting this NoProviderError in case i require "collections/multi-map" — norekhov
– norekhov, Commented Mar 23, 2017 at 10:40

eur00t · Accepted Answer · 2017-03-23 12:02:45Z

8

An error NoProviderError is caused by the fact that collection.js library changes the way how built-in primitives work, particularly Array.

Internally, zone.js (which is a part of Angular) invokes Array.from with an instance of MapIterator as an argument. In collections/shim-array.js file, this library overrides Array.from with an implementation, that doesn't work with MapIterator. In screenshot you can see, that it returns an empty array, while native implementation returns an array of 13 elements.

A conclusion is, that sadly you can't use Collections.js library with Angular.

edited Mar 23, 2017 at 12:02

answered Mar 23, 2017 at 11:49

eur00t

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1 Comment

El pupi Over a year ago

Wrong. You can still use it. Just override Array.from after the library 'collections' is imported in the entry point.

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