Leverage classes from a CommonJS module within a Typescript environment

I am facing an issue with my npm package setup. Here is a snippet from one of the files:

'use strict'

module.exports = class TModel {
  constructor (app) {
    this.app = app
  }

  static schema () {

  }
}

I am trying to incorporate this into a Typescript file like this:

import Model from 't-model';

export class Book extends Model {
    static schema() : any {
        return {
            title: {
                type: 'string'
            }
        }
    }
}

Unfortunately, I am encountering errors. PHPStorm displays the message:

Cannot resolve file

Additionally, when compiling with tsc, I receive the error:

error TS2307: Cannot find module 't-model'

Even after attempting to switch to 't-model/index', PHPStorm stopped showing an error but tsc still raises the same issue.

I am striving to create cohesive packages that work for both backend APIs and front-end applications using Typescript. Is there a solution to this merging dilemma?

Answer №1

My npm package includes a file structured like this:

In the case of TypeScript

Instead of using:

module.exports = class TModel {

Use export class TModel and let TypeScript handle the generation of module.exports (compile with module: commonjs). This approach helps TypeScript comprehend the exports being used.

For more information, visit: https://basarat.gitbooks.io/typescript/content/docs/project/modules.html

If the file is written in JavaScript

You will need to declare it as follows:

declare module 't-model' {
   class TModel // .....
   export = TModel;
}

For further details, check out: https://basarat.gitbooks.io/typescript/content/docs/types/migrating.html

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