Exploring the potential of TypeScript with native dynamic ES2020 modules, all without the need for Node.js, while also enhancing

I have a TypeScript application that utilizes es16 modules, with most being statically imported. I am now looking to incorporate a (validator) module that is only imported in debug mode. Everything seems to be functioning properly, but I am struggling to figure out how to type things to enable code completion and error-checking.

In my main class within main.ts, I have the following:

...
if(debug){
  import('./validator.js').then((module) => this.validate(module))
}
...

The validate method is implemented as follows:

private validate(module):void{
  new module.Validator(dataToValidate);
}

The content of validator.js includes:

export class Validator{
  coonstructor(data:MyDatatype){
     stuff going on here...
  }
}

What I am seeking to understand/achieve is:

In the validate method:

private validate(module:someMeaningfulType){...}

Additionally, I would like to import the Validator class without actually importing it. If I were to write

import {Validator} from './validate.ts' 

at the beginning of main.ts, I would load the file regardless of whether I need it, which contradicts the purpose of dynamic imports.

I could attempt to write a type declaration for module and Validator in main.ts, but even if there were no conflicts, I would still have to manually maintain synchronization with the actual module, which is not ideal - obviously.

I might be overlooking something obvious, but I am struggling to pinpoint it. Finding information solely on the use of native es2020/2022 modules with Typescript can be challenging due to an abundance of details about node-modules overshadowing it.

Answer №1

If you want to determine the type of an imported module, you can make use of import along with typeof:

private checkType(module: typeof import("./checker.js")) { ... }

Another approach is to opt for a type-only import, which will not appear in the final output:

import type * as CheckerModule from "./checker.js";

// ...

private checkType(module: CheckerModule) { ... }

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