Guide to importing a javascript file and referencing it in an Ionic2 project using TypeScript

When attempting to import a JavaScript file into my Ionic2 project for data encryption, I encountered the following error:

TypeScript error: /app/service/Util.service.ts(49,23): Error TS2663: Cannot find name 'RSAKey'. Did you mean the instance member 'this.RSAKey'?

TypeScript error: /app/service/Util.service.ts(52,16): Error TS2304: Cannot find name 'hex2b64'.

I have tried copying the library into a folder and referencing it in index.html as I would with Angular v1, but that did not work. According to the ionic2 documentation, I need to install it via npm, but I am unsure how to do this. Any suggestions on how to proceed? Thanks!

javascriptangulartypescriptionic2

Answer №1

If you're looking to integrate this into your project, there are a couple of approaches you can take.

Firstly, you could go for the more unconventional route and forcefully introduce TypeScript like so:

(<any>window).RSAKey

Alternatively, you can create a proper type definition for your library, similar to the following example:

interface IRSAKey{
  doSomething(): Promise<IRSAKeyResult>;
  hex2b64:string;
}

interface IRSAKeyResult{

}

declare var RSAKey: IRSAKey;

Once you've completed these steps, simply import your interface and make use of RSAKey without any restrictions.

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