[mcollina]

async_hooks.createHook() now emits a DEP0212 deprecation warning. This is the first step of the deprecation cycle suggested in #61030 (comment): warn in the 27 alpha, then require --enable-async-hooks in 27 current.

The AsyncHook class moves to internal/async_hooks, so the inspector and the node.async_hooks trace event category keep using it without emitting the warning.

Printing the warning schedules a tick that a freshly enabled hook sees without a matching init, so the tests that check exact hook invocations now run with --no-deprecation.

Refs: #61030

[nodejs-github-bot]

Review requested:

• @nodejs/inspector
• @nodejs/userland-migrations

[codecov]

Codecov Report

❌ Patch coverage is 42.26804% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.39%. Comparing base (9365fff) to head (2fb146d).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/async_hooks.js	36.78%	55 Missing ⚠️
lib/internal/inspector_async_hook.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #67271      +/-   ##
==========================================
- Coverage   92.99%   90.39%   -2.61%     
==========================================
  Files         428      797     +369     
  Lines      195754   279470   +83716     
  Branches    30292    53617   +23325     
==========================================
+ Hits       182049   252618   +70569     
- Misses      13378    17158    +3780     
- Partials      327     9694    +9367     

Files with missing lines	Coverage Δ
lib/async_hooks.js	100.00% <100.00%> (ø)
lib/internal/trace_events_async_hooks.js	65.97% <100.00%> (-27.84%)	⬇️
lib/internal/inspector_async_hook.js	19.35% <0.00%> (-80.65%)	⬇️
lib/internal/async_hooks.js	59.38% <36.78%> (-38.87%)	⬇️

... and 501 files with indirect coverage changes

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