New to typescript, how do the /** @type comments work with installed NPM modules?

[groovy9]

Edited to add: Turns out this is a problem with the better-sqlite3 and @types/better-sqlite3 packages. better-sqlite3 has no typescript support and the @types package is from a different repo and is known to have such problems.

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So I have a Sveltekit project running and am trying to come up to speed with typescript. But I can't figure out how to get typescript to let me use types from an installed npm package, better-sqlite3. I have both better-sqlite3 and @types/better-sqlite3 installed and in the right places in package.json.

How do I get the following to work? I took a crack at the @type comment but haven't been able to find a concise example of using them with installed NPM nodules.

/** @type {import('better-sqlite3').Database} */
import Database from 'better-sqlite3'
let db:Database = new Database('foo.db');

But LSP throws the error "Cannot use namespace 'Database' as a type."