Module lib/util

Wraps fetch with retry-on-transient-failure and throws FetchError on non-2xx. Retries on HTTP 5xx, HTTP 429, and TypeError (network errors like "Failed to fetch"); returns immediately on other 4xx so typo'd URLs fail fast. AbortError and other exceptions propagate untouched.

Are we in Node?

Are we in a web worker?

Attempt to parse a stack trace from a dynamically created function.