Enhancing external access

I am currently working on enhancing the types of convict. The current definitions export convict using the following:

namespace convict { ... }
interface convict { ... }
declare var convict: convict;
export = convict;

To augment the interface, I have made changes in ./types/convict/index.d.ts:

declare module 'convict' {
  interface convict {
    <T>(
      config: convict.Schema<T> | string,
      options?: { env: Record<string, string> }
    ): convict.Config<T>;
  }
}

However, when importing the default export convict, the augmented interface is not recognized. It seems that this issue is caused by the presence of export = convict and declare var convict: convict. Nonetheless, importing the augmented interface directly works fine:

// Default import fails - same interface as @types/convict
import convict from 'convict';

// Import interface directly is ok - convict interface is augmented
import { convict } from 'convict';

Could someone assist me in comprehending why export = convict and declare var convict: convict are not recognizing the augmented interface?

Answer №1

Based on insights shared by Titian in a comment, the concept of augmenting an external interface is deemed unfeasible due to the export assignment restricting visibility solely to the exported declarations, rendering other declarations as private and untouchable.

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