What is the best way to include multiple modules in a single TypeScript declaration file?

I've encountered a peculiar issue with Module augmentation. I currently have an agument.d.ts file located in my src folder at <ROOT>/src/augment.d.ts. Within this file, I am defining a module for Webpack's raw-loader and extending the existing hapi module. The code snippet is as follows:

import { Server } from 'hapi';

declare module '*.view.html' {
    const contents: string;
    export default contents;
}

declare module 'hapi' {

    interface Server {
        x: string;
    }
}

In my tsconfig.json configuration, I'm utilizing the default settings for typeRoots. Additionally, the include parameter is set to ["src/**/*.ts"].

The issue arises when attempting to augment the hapi module works fine, but the process fails for *.view.html; The compiler consistently throws errors for all imports related to html files.

What's intriguing is that when I relocate the definition for *.view.html to another file such as - xyz.html.d.ts, everything functions perfectly.

Is this behavior intended? Is there a restriction on having only one module augmentation per declaration file? Are there any unspoken rules that I might be overlooking?

Answer №1

To improve your code structure, consider relocating the import statement within the module declaration:

declare module '*.html' {
    const content: string;
    export default content;
}

declare module 'express' {
    import { Application } from 'express';
    interface Application {
        y: number;
    }
}

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