repl: avoid deprecated require.extensions in tab completion

[gulbaki]

This PR replaces the usage of require.extensions in the REPL autocompletion logic with Module._extensions.

require.extensions has been runtime-deprecated under DEP0039, and its usage triggers a warning in recent Node.js versions. Since require.extensions is just a user-land alias for Module._extensions, we can safely access the same object via Module._extensions without any behavioral change or deprecation warning.

Changes:

• this.context.require.extensions → Module._extensions in the REPL complete() function
• Adds an inline comment explaining the deprecation and replacement
• No functional behavior change

Fixes: #58641

[dario-piotrowicz]

Very nice, thanks for the PR @gulbaki 😃🙏

I've left a couple of small comments

[Ethan-Arrowood]

Could you also include a test for this? Here is an example of how I tested process warnings: https://github.com/nodejs/node/blob/main/test/parallel/test-process-warnings.mjs

[Ethan-Arrowood]

Consider moving this to the top of the file.

[marco-ippolito]

Could you also include a test for this? Here is an example of how I tested process warnings: https://github.com/nodejs/node/blob/main/test/parallel/test-process-warnings.mjs

It's not runtime deprecated (doc only) so it's not possible to capture the experimental warning

[dario-piotrowicz]

LGTM 🙂

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.14%. Comparing base (905a722) to head (5cb5079).
Report is 71 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #58653 +/- ## ========================================== - Coverage 90.15% 90.14% -0.01%  ========================================== Files 636 636 Lines 188040 188057 +17 Branches 36903 36895 -8 ========================================== - Hits 169535 169532 -3 - Misses 11239 11278 +39 + Partials 7266 7247 -19 

Files with missing lines	Coverage Δ
lib/repl.js	95.13% <100.00%> (ø)

... and 36 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/67409/

[nodejs-github-bot]

Landed in dcfdaab