Requiring a JavaScript Node.js module in TypeScript (allowJs' is not set)

Question

I have an Angular2 app inside Electron. Now, I would like to use the @pokusew/pcsclite library to use NFC functionality. This library uses native Node.js modules.

When I try to require the library in my component.ts like this:

declare var pcsclite: any;
var pcsclite = require('../../../node_modules/@pokusew/pcsclite/');

I get and error that says:

error TS6143: Module '../..' was resolved to '../../lib/pcsclite.js', but '--allowJs' is not set.

On the other hand, if I try to import the library via a <\script>-Tag in the index.html I get an error that says:

ZoneAwareError Error: Could not locate the bindings file. Tried:...

Finally, if I var pcsclite = require('@pokusew/pcsclite'); in the main.js, then it works, but then I don't have access to it from inside my Angular app.

Community · Accepted Answer · 2017-05-23 11:46:47Z

32

Add the allowJs option in your tsconfig.json like this:
as fabian lauer said also add outDir option to specify where your compiled files will be:

{
    "compilerOptions": {
        "outDir": "./built", <--- add this
        "allowJs": true,  <--- and this
        "target": "es5"
    },
    "include": [
        "./src/**/*"
    ]
}

edited May 23, 2017 at 11:46

CommunityBot

11 silver badge

answered Mar 17, 2017 at 22:14

El houcine bougarfaoui

37.6k10 gold badges40 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Phil Over a year ago

Unfortunately, then I get other errors for each of my .js files. "error TS5055: Cannot write file '...components.js' because it would overwrite input file"

Fabian Lauer Over a year ago

@Phil That's probably because you either didn't set "outDir" or you set the "outDir" in tsconfig.json to the same directory as the source files.

Phil Over a year ago

Ok, I set up the whole project again with Angular CLI to avoid these kind of problems. Using allowJs I am now able to import the module using import * as pcsclite from ".../node_modules/...", but when I try to use it const pcsc = pcsclite(); I get this error in the console: TypeError: exists is not a function(vendor.bundle.js) and some warnings regarding bindings.js when compiling.

El houcine bougarfaoui Over a year ago

i can't use pcsclite becaue Im on windows, try import * as pcsclite from "pcsclite"; or import {} from "pcsclite";

Phil Over a year ago

@Fabian Lauer, yes, instead I will open a new problem for the specific problem that appears now. And thanks to both of you for your help!

|

Collectives™ on Stack Overflow

Requiring a JavaScript Node.js module in TypeScript (allowJs' is not set)

1 Answer 1

6 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related