How to interpret the node code and rejection id on a Unhandled Promise Rejection Warning?

Question

When running a unit test on a typescript service I am seeing this warning:

(node:79377) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 6): [object Object]

What does node: tell me? Also, what does rejection id: tell me?

--NOTE--

My question is not how to find the unhandled promise, but what the "numbers" in the warning communicate.

Answer 1

(node:79377) is node PID (process ID) https://github.com/nodejs/node/blob/master/lib/internal/process/warning.js#L4

rejection id is id of rejected Promise https://github.com/nodejs/node/blob/master/lib/internal/process/promises.js#L40 grab Promise ID https://github.com/nodejs/node/blob/master/lib/internal/process/promises.js#L63 generate warning/error