Using npm modules in Typescript

Question

I would like to use npm module in Typescript project but there is no typings or tsd for this module. When I try use import Module from 'module' I had an error : Cannot find module 'module'. Is there way to fix it?

[EDIT] My tsconfig.json:

{
  "compilerOptions": {
    "target": "ES5",
    "moduleResolution": "node",
    "module": "commonjs",
    "noEmitOnError": true,
    "noImplicitAny": true,
    "experimentalDecorators": true,
    "sourceMap": true,
    "sourceRoot": "src",
    "outDir": "bld"
  },
  "exclude": [
    "bld"
  ]
}

Has been answered in this other S/O question

Offirmo
– Offirmo

2016-07-06 16:37:16 +00:00
Commented Jul 6, 2016 at 16:37 — Offirmo
– Offirmo, Commented Jul 6, 2016 at 16:37

Amid · Accepted Answer · 2016-03-31 08:10:55Z

20

I assume your question is related to importing the module

import Module from 'module'

And not exporting it as you stated. If this is the case your can fall back to plain javascript and require module like this:

var Module = require('module');

[EDIT]

Verify that in tsconfig.json you have the following lines in compiler options:

"compilerOptions": { 
    "moduleResolution": "node",
    "module": "commonjs"
}

Hope this helps.

edited Mar 31, 2016 at 8:10

answered Mar 30, 2016 at 13:12

Amid

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6 Comments

qwe asd Over a year ago

Yes, it's question about importing. For me doesn't work both variants. I guess, the problem is that there is no type definition for module, and typescript don't looking for it in node_modules. But I don't know how to fix it.

Amid Over a year ago

No you do not need type definitions for the second version. Check updated answer.

qwe asd Over a year ago

I fixed tsconfig.json according to your changes, but had the same error: Cannot find module 'module'. Check updated tsconfig.json, please

Amid Over a year ago

Have you installed the module? can you verify that the module's folder is present in your 'node_modules' folder?

Amid Over a year ago

The only thing that comes to mind is that your module is not compiled targeting commonjs. You can test this with using any other module without definitions. Take for example 'merge2' install it via npm and verify that var merge = require('merge2'); works.

|

Nahush Farkande · Accepted Answer · 2017-02-27 06:36:41Z

2

In case you wish not to pollute your imports with requires, you can follow the following method.

You can create a module.d.ts definition file which contains the following

declare module Module {}

Your imports should work now.

If you wish to import something like

import { abc } from 'module';

just go ahead and add the following to module.d.ts

declare module Module {
    export let abc: any
}

answered Feb 27, 2017 at 6:36

Nahush Farkande

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Comments

jmpeace · Accepted Answer · 2020-10-01 16:13:03Z

1

By example: npm install numwords

Then added the import the .ts file: import * as numwords from 'num-words';

And then the usage: console.log((numwords(5));

answered Oct 1, 2020 at 16:13

jmpeace

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