Javascript Library Issue: "Implicitly Declared Type 'Any' Error"

I am currently in the process of developing a JavaScript library that will interact with an API. My goal is to create a module that can be easily published on npm and utilized across various frameworks such as Angular or React. Below is the code snippet for my class along with the necessary files for publishing:

masivPushWebService.js

import { MANAGMENT_API_URL, WEB_PLATFORM } from './constants.js';
import { sendPost } from './httpUtils.js';

class masivPushWebService {

    constructor(externalApplicationId) {
        this.externalApplicationId = externalApplicationId;
    }

    async registerToken(payload) {
        let body = {
            token: payload,
            platform: WEB_PLATFORM,
            externalApplicationId: this.externalApplicationId
        }
        const response = await sendPost(MANAGMENT_API_URL + "tokens", body)
        return response
    }

}

export default masivPushWebService;

package.json

{
  "name": "npm-servtest",
  "version": "1.0.0",
  "description": "",
  "main": "src/masivPushWebService.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "strict": true,
    "esModuleInterop": true
  }
}

After successfully publishing the library, I encountered an error while trying to install it in an Angular project. The error message reads:

Could not find a declaration file for module 'npm-servtest'. '.../masivPushWebService.js' implicitly has an 'any' type. Try

npm i --save-dev @types/npm-servtest
if it exists or add a new declaration (.d.ts) file containing `declare module 'npm-servtest';

As someone who is relatively new to front-end development, I have attempted to troubleshoot this issue without success. Any assistance would be greatly appreciated. Thank you!

Even after including the tsconfig.json file, the problem persists.

Answer №1

Begin by deleting the tsconfig.json file if you are not using TypeScript, as it is unnecessary.

Next, pay attention to how you import the library into your Angular project. The correct way to do this is:

import masivPushWebService from 'library';

If your library exports a global variable, you may also need to include:

declare const globalVar: any;

Lastly, modify your tsconfig.json to exclude checking external libraries. Your Angular application should not be concerned with external libraries that do not adhere to your configuration. To do this, add the following line:

  "exclude": [
    "node_modules"
  ]

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