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Javascript – Imported npm package module is undefined at runtime

I installed a package called "js-linq" (https://github.com/battousai999/js-linq) via npm install js-linq and it appeared to install correctly. This is explicitly in the documentation on npm (https://www.npmjs.com/package/js-linq).

I import it with the usual syntax import { Linq } from 'js-linq' and then try to use it in my React project according to the documentation: const items = Linq.from([1, 2, 3, 4, 5]).

There are no typescript errors or anything suggesting the import is bad.

But at runtime it fails, saying Linq is undefined.

What am I doing wrong here?

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2

Answers


  1. 0

    It seems like the types in this package in jslinq.ts don’t match up with what’s actually exported in the Javascript jslinq.js. You can get it to work as follows:

    import Linq from 'js-linq'
console.log(Linq)
// doesn't work despite the types suggesting it should
// const items = new Linq.Linq([1, 2, 3, 4, 5])

// this works
// @ts-ignore
const items = Linq.from([1, 2, 3, 4, 5])
console.log(items.where((x) => x > 2).toArray()) // [3, 4, 5]
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  2. 0

    Please use yarn

    • Install it using : npm install –global yarn
    • Then install your dependency: yarn add js-linq
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