// Unstructured, no retry info, no HTTP mapping
if (!env.MY_KV) throw new Error("KV not bound")

try {
  await doSomething()
} catch (e) {
  // Is this retryable? What status code? Who knows.
  return new Response("error", { status: 500 })
}

import {
  NotFoundError,
  RateLimitError,
  ValidationError,
  errorToResponse,
  isRetryable,
} from "@workkit/errors"

// Typed errors with HTTP status codes and retry strategies
throw new NotFoundError("User not found") // 404, not retryable
throw new RateLimitError("Too many requests") // 429, retryable with backoff
throw new ValidationError("Invalid email", [
  { path: ["email"], message: "Must be a valid email" },
])

// Convert any WorkkitError to a proper HTTP Response
app.onError((err) => errorToResponse(err)) // { error: "...", code: "NOT_FOUND" }

// Check retryability and get delay
if (isRetryable(err)) {
  const delay = getRetryDelay(err, attempt) // respects error's retry strategy
}