refactor(timer): centralize microtask types and queueMicrotask access; expand nextTick and microtask coverage

[nev21]

• move MicrotaskFn and ScheduleMicrotaskFn from microtask.ts to types.ts
• move getQueueMicrotask and hasQueueMicrotask from microtask.ts to environment.ts
• update exports in index.ts to expose moved APIs from their new modules
• update internal imports across timer microtask modules and nextTick to use shared helper types/environment access
• update scheduleNextTick in nextTick.ts to prefer process.nextTick, then queueMicrotask, then existing fallback resolution
• add internal queue scheduler helper in microtaskQueue.ts
• extend tests in microtask.test.ts for internal microtask queue rescheduling behavior
• extend tests in nextTick.test.ts for Promise fallback ordering and no-Promise/no-microtask edge scenarios
• align nextTick tests to explicitly disable queueMicrotask where Promise/timer fallback behavior is being validated

[codecov]

Codecov Report

❌ Patch coverage is 96.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.17%. Comparing base (87cb303) to head (8247d96).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/timer/microtasks/microtaskQueue.ts	94.64%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
- Coverage   99.35%   99.17%   -0.18%     
==========================================
  Files         165      179      +14     
  Lines        5089     5475     +386     
  Branches     1116     1200      +84     
==========================================
+ Hits         5056     5430     +374     
- Misses         33       45      +12     

Files with missing lines	Coverage Δ
lib/src/helpers/environment.ts	97.84% <100.00%> (-0.95%)	⬇️
lib/src/helpers/types.ts	100.00% <ø> (ø)
lib/src/timer/microtask.ts	100.00% <100.00%> (ø)
lib/src/timer/microtasks/cancellableTask.ts	96.42% <100.00%> (ø)
lib/src/timer/microtasks/processNextTick.ts	100.00% <100.00%> (ø)
lib/src/timer/microtasks/promiseQueue.ts	95.45% <100.00%> (ø)
lib/src/timer/microtasks/resolveScheduleFn.ts	100.00% <100.00%> (ø)
lib/src/timer/microtasks/runMicrotask.ts	100.00% <100.00%> (ø)
lib/src/timer/nextTick.ts	98.52% <100.00%> (+0.02%)	⬆️
lib/src/timer/microtasks/microtaskQueue.ts	94.64% <94.64%> (ø)

... and 2 files with indirect coverage changes

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[Copilot]

Pull request overview

Centralizes microtask-related types and the queueMicrotask accessor into shared helper modules, threads them through the timer subsystem, updates scheduleNextTick to prefer queueMicrotask after process.nextTick, adds a new internal queue-batched microtask scheduler, and extends test coverage for fallback ordering and queue semantics.

Changes:

• Move MicrotaskFn/ScheduleMicrotaskFn to helpers/types.ts and getQueueMicrotask/hasQueueMicrotask to helpers/environment.ts; re-point internal imports and root exports accordingly.
• Update scheduleNextTick to fall back through queueMicrotask between process.nextTick and the Promise/timer paths, plus add a new _getMicrotaskQueueFn batching helper in microtaskQueue.ts.
• Expand microtask/nextTick tests to cover queueMicrotask batching across queue types and Promise/timer-fallback ordering scenarios.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
lib/src/helpers/types.ts	Adds MicrotaskFn and ScheduleMicrotaskFn type aliases.
lib/src/helpers/environment.ts	Adds getQueueMicrotask / hasQueueMicrotask exports.
lib/src/index.ts	Re-exports the moved types and environment helpers from their new modules.
lib/src/timer/microtask.ts	Removes the moved types/accessors and imports them from new locations.
lib/src/timer/nextTick.ts	Adds queueMicrotask to the fallback chain and updates TSDoc.
lib/src/timer/microtasks/microtaskQueue.ts	New helper batching queueMicrotask calls per queue type.
lib/src/timer/microtasks/{cancellableTask,processNextTick,promiseQueue,resolveScheduleFn,runMicrotask}.ts	Repoint type imports to helpers/types.
lib/test/src/common/timer/microtask.test.ts	Adds coverage for _getMicrotaskQueueFn rescheduling and queue-type ordering.
lib/test/src/common/timer/nextTick.test.ts	Disables queueMicrotask in fallback paths and adds Promise/timer-fallback ordering tests.

[nevware21-bot]

Approved by nevware21-bot

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

[nevware21-bot]

Approved by nevware21-bot