import { Request as ExpressRequest, Response as ExpressResponse } from 'express';
declare module 'kvl' {
export = kvl;
}
declare const kvl: {
ValidationDone:(param:(error: any, response: ExpressResponse) => void) => void;
}
Module augmentations do not allow exports or export assignments.
Even though I was declared in a .d.ts file, am I unable to use it in this way?
Enhancing Modules:
In Typescript, the concept of module augmentation refers to extending an existing module by adding new definitions to it. This process comes with its own specific syntax:
To learn more about module augmentation, you can visit this link.
Following the documentation provided, your code should resemble the following example:
// file1.ts
import { Request as ExpressRequest, Response as ExpressResponse } from 'express';
// module name must align with "express"
declare module 'express' {
// no exports are allowed here
const kvl : {
ValidationDone:(param:(error: any, response: ExpressResponse) => void) => void;
}
}
Now that you have extended the express module, you can utilize it in this manner:
// file2.ts
import {kvl} from "express";
// ...
Creating Declaration Files:
If you prefer not to inject your new types into the express module directly, you can opt for a declaration file dedicated to your new module. There are multiple approaches available, details of which are provided here.
Essentially, you need to analyze how the code will be used and structure your declarations accordingly. In this scenario, it seems like you intend to import kvl as a module. A reference template for such a declaration file can be found at this location.
I have updated your code snippet with the correct syntax suitable for a .d.ts file:
//kvl.d.ts
import { Request as ExpressRequest, Response as ExpressResponse } from 'express';
export as namespace kvl;
export const kvl : {
ValidationDone:(param:(error: any, response: ExpressResponse) => void) => void;
};
Implementing a Module:
If kvl represents your custom code, there is no necessity for working with declaration files. TypeScript is capable of analyzing your modules on its own. A sample implementation for a module definition generating a kvl constant with appropriate type might appear similar to this:
// kvl.ts
import { Request as ExpressRequest, Response as ExpressResponse } from 'express';
export const kvl : {
ValidationDone:(param:(error: any, response: ExpressResponse) => void) => void;
} = {ValidationDone: function(param){}};
Kindly note that modules automatically derive their modulename from the filename where they reside. Therefore, the above code should reside in a file named kvl.ts.
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