How to use generator function in typescript

I am trying to use generator function in typescript. But the compiler throws error

error TS2339: Property 'next' does not exist on type

Below is an closest sample of my code.

export default class GeneratorClass {
    constructor() {
        this.generator(10);
        this.generator.next();
    }
    *generator(count:number): Iterable<number | undefined> {
        while(true)
            yield count++;
    }   
}

Here is the playground link for the same

Answer

The next method exists on the generator that the function returns, not on the generator function itself.

export default class GeneratorClass {
    constructor() {
        const iterator = this.generator(10);
        iterator.next();
    }
    *generator(count:number): IterableIterator<number> {
        while(true)
            yield count++;
    }   
}