const normalize = (directory: string) => directory.replace(/[\\/]+$/, "") type State =  | {      status: "pending"    }  | {      status: "ready"    }  | {      status: "failed"      message: string    } const state = new Map<string, State>()const waiters = new Map<  string,  {    promise: Promise<State>    resolve: (state: State) => void  }>() function deferred() {  const box = { resolve: (_: State) => {} }  const promise = new Promise<State>((resolve) => {    box.resolve = resolve  })  return { promise, resolve: box.resolve }} export const Worktree = {  get(directory: string) {    return state.get(normalize(directory))  },  pending(directory: string) {    const key = normalize(directory)    const current = state.get(key)    if (current && current.status !== "pending") return    state.set(key, { status: "pending" })  },  ready(directory: string) {    const key = normalize(directory)    const next = { status: "ready" } as const    state.set(key, next)    const waiter = waiters.get(key)    if (!waiter) return    waiters.delete(key)    waiter.resolve(next)  },  failed(directory: string, message: string) {    const key = normalize(directory)    const next = { status: "failed", message } as const    state.set(key, next)    const waiter = waiters.get(key)    if (!waiter) return    waiters.delete(key)    waiter.resolve(next)  },  wait(directory: string) {    const key = normalize(directory)    const current = state.get(key)    if (current && current.status !== "pending") return Promise.resolve(current)     const existing = waiters.get(key)    if (existing) return existing.promise     const waiter = deferred()     waiters.set(key, waiter)    return waiter.promise  },}