import { DurableObject } from "cloudflare:workers";import { msUntilFull, take, type Bucket, type Decision } from "./bucket.ts";// One RateLimiter per client, named by the client's IP (src/worker.ts). A Durable Object runs// one call at a time, so two requests can never spend the same token.export class RateLimiter extends DurableObject {  async take(): Promise<Decision> {    const now = Date.now();    const { bucket, decision } = take(await this.ctx.storage.get<Bucket>("bucket"), now);    await this.ctx.storage.put("bucket", bucket);    // A full bucket is the same as an empty object, so clear it then instead of keeping one    // row per IP we have ever seen.    await this.ctx.storage.setAlarm(now + msUntilFull(bucket));    return decision;  }  async alarm(): Promise<void> {    await this.ctx.storage.deleteAll();  }}