Is there a way to define a third-party module that is structured like this:
Within the third-party module:
module.exports = function foo(){
// perform an action
}
In my code:
import * as foo from 'foo-module'; // Unable to locate a declaration module for ...
foo();
For detailed information on how to work with 3rd party modules, take a look at the official documentation.
The way you write the declaration for a module depends on its structure and exports.
In the provided example, it's a CommonJS module (module.exports = ...) which may not align perfectly with an ES6 module as ES6 does not support exporting a function directly as the module itself.
If you are using TypeScript version 2.7 or above, the addition of esModuleInterop compiler option eliminates the need for certain hacks when dealing with non-ES6 compatible exports in CommonJS modules.
To leverage this feature, ensure that you have set esModuleInterop: true in your tsconfig.json file:
{
"compilerOptions" {
...
"esModuleInterop": true,
...
}
}
To declare a module like foo-example, create a .d.ts file with this format:
declare module "foo-module" {
function foo(): void;
export = foo;
}
You can then import it either as a namespace or as a default import.
In case you are working with an older setup, you can still define a module like foo-example in a .d.ts file using a slightly different syntax:
declare module "foo-module" {
function foo(): void;
namespace foo { } // This hack enables ES6 wildcard imports
export = foo;
}
This allows you to import the module as you intended.
The official TypeScript documentation offers valuable insights into creating declaration files and provides templates for various types of declarations. Check out their resources on declaration files and templates for reference.
I encountered a similar issue and faced challenges while trying to add a type definition to my project. However, after much effort, I managed to solve it by following these steps.
Consider the module below (consisting of constants only), referred to as some-module - located at node_modules/some-module/index.js.
'use strict';
exports.__esModule = true;
var APPS = exports.APPS = {
ona: 'ona',
tacq: 'tacq',
inetAcq: 'inetAcq'
};
Firstly, I included baseUrl and typeRoots in tsconfig.json
{
...
"compilerOptions": {
...
"baseUrl": "types",
"typeRoots": ["types"]
}
...
}
Next, within my project root directory, I created a folder named types with an identical folder structure to the module's typings in types/some-module/index.js, where I placed the following code:
declare module 'some-module' {
type Apps = {
ona: string;
tacq: string;
inetAcq: string;
};
let APPS: Apps
}
Finally, I was able to import it into my my-file.ts file with proper typings!
import { APPS } from 'some-module';
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