Typescript declaration file for an external npm package - constructor - node.js

Question

I am using ES6 and Typescript for my Node project, however one library is a commonjs library.
For that library, I created my own .d.ts declaration file:
module "#alpacahq/alpaca-trade-api" {
export interface AlpacaParams { ... }
// ...
export class Alpaca implements Broker {
// ...
constructor(params: AlpacaParams);
}
export default Alpaca;
}
Everything works as expected, but I'm having a problem with the constructor.
If I use that class from within my project, and I try this:
this.alpaca = new Alpaca.Alpaca({...});
I get told that Alpaca.Alpaca is not a constructor.
The only way it seems to work is if I do:
this.alpaca = new Alpaca.default({...});
I'm quite new to Typescript, so I'm sure I'm doing something wrong. Any ideas?
The latter works, so I'm not blocked in my work, but I would like to set things up properly.
Thank you!
Edited to show TS config and imports
tsconfig.json
{
"compilerOptions": {
"target": "es6",
"module": "es6",
"lib": ["es6", "es5"],
"sourceMap": true,
"outDir": "dist",
"rootDir": "src",
"strict": true,
"moduleResolution": "node",
"typeRoots": ["./types"],
"esModuleInterop": true,
"resolveJsonModule": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true
}
}
This is how I import it. Couldn't figure out how to make it work otherwise. If I import modules ES6 style, it breaks unless I use commonjs. If I use commonjs, I get an "export undefined" error.
import * as Alpaca from '#alpacahq/alpaca-trade-api';

Answer 1

The problem is that you're importing all named exports with import * meaning that Alpaca refers to the module and .default refers to the exported class. Instead you should be importing just the default member.
Change your import to look like this:
// Import default member from module
import Alpaca from '#alpacahq/alpaca-trade-api';
this.alpaca = new Alpaca({...});