doesn't work bro

test.ts

type State = 'initialized' | 'processing' | 'completed' | 'failed';

interface Pipeline<T extends State> {
  state: T;
  start(this: Pipeline<'initialized'>): Pipeline<'processing'>;
  finish(this: Pipeline<'processing'>): Pipeline<'completed'>;
  retry(this: Pipeline<'failed'>): Pipeline<'processing'>;
}

declare const p: Pipeline<'initialized'>;

p.start();
p.finish();

// p.retry();