Node.js 18.8.0 changed return type of `module.findSourceMap()`

[danez]

Version

18.8.0

Platform

not relevant

Subsystem

module

What steps will reproduce the bug?

assert(require('node:module').findSourceMap('') === undefined)

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior?

Return undefined

What do you see instead?

Return null

Additional information

avajs/ava#3092

https://github.com/nodejs/node/pull/43875/files#r954804828

[legendecas]

Thank you for reporting this! I'll submit a regression for this.

[sindresorhus]

I also noticed that the return value in the docs does not show that it can be undefined (or null).