CODEWITHSUNDEEP
typescript
helion3
helion3

Reputation: 37481

Extend class in third party definition file

I provide a typescript definition file for a non-ts library I've written. My library extends EventEmitter2 as a "native" event system so I'm trying to determine how to define that:

/// <reference types="eventemitter2" />

declare module "my-module" {
  class MyClass extends EventEmitter2 {
    // ...
  }
}

... which doesn't work. EventEmitter2 provides a d.ts file so it should be available, but the error I get is:

Cannot find name 'EventEmitter2'

I don't work with ts enough to know where I'm going wrong. I've tried reading docs/looking for examples but nothing seems to address this type of issue.

Upvotes: 3

Views: 856

Answers (1)

cartant
cartant

Reputation: 58430

Rather than using a triple-slash directive, you can import the type declarations from eventemitter2:

import { EventEmitter2 } from 'eventemitter2';

declare module "my-module" {
  class MyClass extends EventEmitter2 {
    // ...
  }
}

The triple-slash directive does not work because the .d.ts file is in the module itself and is not under node_modules/@types.

Upvotes: 2

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