Does the method in the superclass "not exist" within this type....?

Our TS application utilizes a JavaScript library, for which we crafted a .d.ts file to integrate it with TypeScript. Initially, the file resided in a "typings" directory within the project and everything operated smoothly. Subsequently, we opted to relocate these typings to a separate repository to facilitate sharing across multiple projects.

The problem arises post the relocation of typings to an external repository; the IDEs (Idea and VSCode) fail to recognize properties and methods from the super type. Interestingly, despite the IDEs indicating errors, the application compiles, runs, and all functionalities operate as expected.

Do you have any insights on how to address this issue?

The structure of the typing repository is as follows:

-custom-typings
  - index.d.ts
  - tsconfig.json
  - package.json

package.json:

{
  "name": "custom-typings",
  "author": "Author Name",
  "version": "0.1.3",
  "types": "./index.d.ts",
  "dependencies": {
    "typescript": "next"
  }
}

tsconfig:

{
  "compilerOptions": {
    "target": "ES2015",
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictBindCallApply": true,
    "esModuleInterop": true,
    "alwaysStrict": true,
    "lib": [
      "ES2015",
      "ES2016",
      "dom"
    ],
    "pretty": true,
    "moduleResolution": "node",
    "module": "ES2020"
  },
  "exclude": [
    "dist",
    "node_modules",
  ],
  "typeAcquisition": {
    "enable": true
  }
}

index.d.ts

declare module 'custom-typings' {

  export class A {
    aMethod();
  }

  export class B extends A{
    bProperty: any = {foo: 'Foo'};
  }

  const CustomTypes: {
    B: typeof B;
  };

  export default CustomTypes
}

Utilizing the types:

import CustomTypes from 'custom-typings';

class MyComponent extends CustomTypes.B {
  
  init() {
    console.log(this.bProperty.foo); // property 'bProperty' does not exist in type MyComponent
    this.aMethod(); // property 'aMethod' does not exist in type MyComponent
  }
}

Answer №1

It turned out that the arrangement of the "custom-typings" repository was causing issues with resolving types in the project.

We were creating type definitions for a pre-existing library that already had its own module declared. Our repository was also declaring a module with the same name as the library's, which we'll refer to as "lib-module".

In order for the types repository to work properly, it must include a directory named "lib-module" and declare the module using that exact name:

declare module "lib-module" {
    // properties and functions go here
}

The updated structure looks like this:

-custom-typings
  - lib-module
    - index.d.ts
  - tsconfig.json
  - package.json

This way, any project can easily import the types using:

import CustomTypes from 'lib-module';

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