React Typescript - Cannot find module ... or its corresponding type declarations even after creating declaration

I'm trying to use collections/sorted-map in my React TS project. sorted-map doesn't have a declaration. I found out that I need to create my own sorted-map.d.ts declaration (React, Typescript - Cannot find module ... or its corresponding type declarations).

Luckily there is a declaration for sorted-set which is part of sorted-map so it should be relatively easy.

The problem is - even after creating sorted-map.d.ts I still get the same error:

Cannot find module 'collections/sorted-map' or its corresponding type declarations.ts(2307)

Sandbox

src/sorted-map.d.ts:

import {SortedSet} from "collections/sorted-set"

declare module 'collections/sorted-map'
// declare const SortedMap: internal.SortedMapStatic;

declare namespace SortedMap {
    type Iterator<T> = internal.Iterator<T>;
    type SortedMap<T> = internal.SortedMap<T>;
}

declare namespace internal {
    interface SortedMapStatic {
        <T>(
            values?: T[],
            equals?: (a: T, b: T) => boolean,
            compare?: (a: T, b: T) => number,
            getDefault?: any,
        ): SortedMap<T>;
        new <T>(
            values?: T[],
            equals?: (a: T, b: T) => boolean,
            compare?: (a: T, b: T) => number,
            getDefault?: any,
        ): SortedMap<T>;
    }

    class Iterator<T> {
        constructor(set: SortedMap<T>, start?: T, end?: T);
        next(): { done: boolean; value: T | undefined };
    }

    class SortedMap<T> {
        readonly length: number;

        constructor(values?: T[], equals?: (a: T, b: T) => boolean, compare?: (a: T, b: T) => number, getDefault?: any);
        constructClone(values?: T[]): SortedMap<T>;
        iterate(): Iterator<T>;
        store: SortedSet<T>;
    }
}

export = SortedMap;

App.tsx:

import { SortedMap } from "collections/sorted-map";

export default function App() {
  return <div>Test</div>;
}