Guide on utilizing a declaration within a third-party module

I have encountered an issue while using the fingerprintjs2 library, as the declaration provided in DefinitelyTyped seems incomplete and incompatible.

In order to resolve this, I decided to create my own declaration within my project. However, I am facing difficulties when trying to load this custom declaration in my code, resulting in the error:

Cannot find module 'fingerprintjs2'

specifically for this import statement:

import Fingerprint2, { TCallback, TComponent } from 'fingerprintjs2';

The declaration I wrote is isolated within a module, located at

// ./src/@types/fingerprintjs2/index.d.ts

// ...other exported types

export type TComponent = {
    key: string;
    value: string | number | boolean | string[];
};

export type TCallback = (components: TComponent[]) => void;

export default interface fingerprintjs2 {
    get(callback: TCallback): void;
    get(options: TOptions, callback: TCallback): void;
    getPromise(options: TOptions): Promise<TComponent[]>;
}

This issue persists despite configuring my tsconfig.json file as follows:

{
    "include": ["src/**/*"],
    "exclude": ["node_modules"],
    "compilerOptions": {
        "allowSyntheticDefaultImports": true,
        "baseUrl": ".",
        "declaration": true,
        "declarationDir": "./dist",
        "lib": ["dom", "es5", "scripthost"],
        "module": "es6",
        "noImplicitAny": true,
        "outDir": "./dist",
        "paths": { "*": ["./src/@types*"] },
        "target": "es5"
    }
}

I would greatly appreciate any advice or assistance on how to properly address this issue. Thank you for your help.

For reference, I am working with Typescript 3.1.6 in Webstorm 2018.2

Answer №2

An issue arose with resolving the module due to changes made in the tscongif.json file's compiler options

++ "moduleResolution": "node",
-- "paths": { "*": ["./src/@types*"] },
++ "paths": { "*": ["./node_modules/*", "./src/@types/*"] },

After adjusting the paths, the module was successfully resolved.

An error was encountered stating that the module exports a type only, when in fact it should export an interface. To resolve this, the interface had to be implemented before exporting the value as shown below:

// declare const value with interface
declare const fingerprint: fingerprintjs2;
// export that const value
export default fingerprint;

Following these adjustments, the module is now functioning correctly.

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