Definition files (.d.ts) for JavaScript modules

I'm currently working on creating Typescript typings for the link2aws package in order to incorporate it into my Angular project. Despite generating a .d.ts file, I am still encountering the following error message:

TypeError: (new link2aws__WEBPACK_IMPORTED_MODULE_1__.ARN(...)).consoleLink is not a function
.

The way I am importing ARN from link2aws is as follows:

import { ARN } from 'link2aws';

And I am using it like this:

arn = 'arn:aws:...'
let link = new ARN(arn).consoleLink();

link2aws.d.ts

// Type definitions for link2aws
// Project: https://github.com/link2aws/link2aws.github.io#readme
// Definitions by: me <url redacted> 

declare module 'link2aws' {
  class ARN {
    constructor(text: string);
    string(): string;
    console(): string;
    qualifiers(): string[];
    pathLast(): string;
    consoleLink(): string;
  }
}

Answer №1

When developing typings for an existing module, it is crucial that they align with the source code.

Referencing usage from the documentation

new ARN('arn:aws:s3:::abcdefgh1234').consoleLink;

It appears that consoleLink is a property of ARN, not a function.

Upon examining the source code, you will find

get consoleLink() { ... } 

this indicates a getter. Therefore, the runtime behavior is accurate. consoleLink (and likely other properties as well, without delving too deeply into specifics) is not a function and should not be treated as such when called.

A proper typing for that class might resemble

class ARN {

  ...

  public consoleLink: string;

}

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