Improve KV Store Publishing algorithm #32
Merged
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This PR makes the following changes:
Node.js 20 is now a requirement. This is a version of Node.js where fetch() is marked as "Stable"
callFastlyApinow throwsFetchError, a custom error type that includes the status code. This simplifies error handling logic as error status codes and connection problems can be handled/retried together.retryablecan mark certain errors as "possible to retry". This includes certain error codes as well as problems with the network (fetch itself failing).A "fetch pool" of 12 concurrent workers all submitting to the KV store in parallel. This speeds up publishes. Whenever a submit fails, there is a backoff for retries so that the system tries again.
Some TypeScript code cleanup
Fixes #29