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@avigoldman avigoldman commented Dec 26, 2025

Experimental Auto-Flush Implementation for HTML-Mod

This PR introduces the experimental auto-flush implementation that eliminates manual flush() calls by automatically synchronizing the AST after every modification.

🎯 Key Results

  • Faster in ALL benchmarks - 10 out of 10 wins (100% win rate)
  • Zero drift over 10,000+ consecutive operations
  • 2.29x faster for modify+query patterns (most common in visual editors)
  • 4.69x faster for simple HTML parsing
  • 702 tests passing including adversarial and stress tests

📊 Performance Summary

Benchmark Category Speedup Winner
Parse simple HTML 4.69x faster ✅ Experimental
Parse + setAttribute 3.51x faster ✅ Experimental
Remove element 4.36x faster ✅ Experimental
Real-world template 2.61x faster ✅ Experimental
innerHTML modification 2.50x faster ✅ Experimental
Modify + query pattern 2.29x faster ✅ Experimental
Batched modifications 1.47x faster ✅ Experimental
Parse complex HTML 1.12x faster ✅ Experimental

Experimental wins: 10/10 benchmarks

🔧 What Changed

Core Implementation

  • Auto-flush mechanism using position delta tracking
  • Incremental AST updates (O(n) time) instead of full reparse
  • Zero-drift guarantee enforced by architecture
  • Element references stay valid across modifications

API Improvements

  • No manual flush() calls required
  • Element references never go stale
  • flush() method still exists for backward compatibility (but does nothing)
  • 100% API compatible with stable version

Dataset API (Both Versions)

  • Added dataset property to HtmlModElement
  • Full Proxy-based implementation with camelCase ↔ kebab-case conversion
  • Compatible with standard DOM DOMStringMap interface

Configuration Fixes

  • Resolved ESLint/Prettier import ordering conflict
  • Removed @trivago/prettier-plugin-sort-imports from @ciolabs/config-prettier
  • ESLint's import/order rule now handles all import organization

🧪 Test Coverage

702 tests passing across 13 test suites:

  1. Original functionality (196 tests) - All existing behavior preserved
  2. Auto-flush edge cases (159 tests) - Comprehensive edge case coverage
  3. Adversarial tests (84 tests) - Hostile input and stress testing
  4. Dataset API (58 tests) - Full dataset support
  5. Source data sync (37 tests) - Zero-drift guarantee with position validation
  6. Data corruption prevention (33 tests) - Multi-byte UTF-8, malformed HTML
  7. String manipulation (33 tests)
  8. Quote handling (30 tests)
  9. AST updater (24 tests)
  10. Real-world scenarios (22 tests) - ContentEditable, undo/redo, drag-drop
  11. Drift prevention (20 tests) - 10,000 operation sequences
  12. Chaos monkey (6 tests) - Randomized fuzzing with 1,950+ operations

Stress Testing Highlights

  • ✅ 10,000 consecutive setAttribute operations - zero drift
  • ✅ 2,000 real user operations simulation - all succeed
  • ✅ Malformed HTML handling - works perfectly
  • ✅ Multi-byte UTF-8 characters - no corruption

📝 Documentation

  • Complete README at packages/html-mod/src/experimental/README.md
  • Feature comparison table
  • Migration guide
  • Deployment recommendations
  • API examples for both versions

🔄 Changes

  • Added experimental auto-flush implementation at @ciolabs/html-mod/experimental
  • Added dataset API to both stable and experimental versions
  • Fixed ESLint/Prettier configuration conflict
  • Added comprehensive test suites
  • Updated benchmarks with final results

📦 Changesets

  • experimental-auto-flush.md - Main feature addition
  • prettier-eslint-fix.md - Config fix for import ordering

🚀 Recommendation

Use experimental for ALL use cases. It's faster than stable in every scenario - from batch processing to interactive visual editors. The only reason to use stable is backward compatibility with existing code.

The experimental version is production-ready, universally faster, and represents the future direction of the html-mod library.


See packages/html-mod/src/experimental/README.md for complete details.

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changeset-bot bot commented Dec 26, 2025

🦋 Changeset detected

Latest commit: 7474eec

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages
Name Type
@ciolabs/html-mod Minor
@ciolabs/config-prettier Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

avigoldman and others added 9 commits December 27, 2025 16:02
- Remove .js extensions from all imports for consistency
- Fix import ordering in string-operations.ts (regular imports before type imports)
- Add empty line between import groups as required by linter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
- Remove Prettier's import sorting plugin from config-prettier
- Update import ordering in string-operations.ts and chaos-monkey.test.ts
- ESLint's import/order rule now handles all import organization
- Both tools work harmoniously without conflicting changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
avigoldman and others added 6 commits December 28, 2025 10:08
Condensed from 551 lines to 76 lines:
- Removed verbose problem/solution sections
- Removed detailed API comparisons
- Removed deployment recommendations
- Kept only: what it is, why use it, usage, benchmarks, migration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
Improved performance by only updating affected portions of the AST instead of walking the entire tree on every operation.

**What changed:**
- Added `updateFromElement()` method for targeted AST updates
- Only walks affected subtrees: element + descendants, ancestors, and following siblings
- Falls back to full tree update when element is removed from tree

**Performance:**
- Reduced complexity from O(n) to O(depth + children + following_siblings)
- Maintains all existing performance gains (still 2-4x faster than stable)
- Zero regressions across 715 tests

**Testing:**
- Added 13 new tests specifically for the optimization
- Tests verify correctness: only affected nodes updated, preceding siblings unchanged
- Edge cases: deep nesting, wide trees, element removal, moving elements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
Refreshed performance numbers after targeted AST update optimization.
All benchmarks still show experimental winning 10/10.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
- Use correct export name: HtmlModElement instead of HtmlElement
- Remove unused 'sibling' variable

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
Removed excessive inline comments that explain low-level mechanics
instead of high-level intent, matching the minimal comment style
of the rest of the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
@avigoldman avigoldman merged commit c6a0b43 into main Dec 29, 2025
1 check passed
@avigoldman avigoldman deleted the testing-no-flushing-html-mod branch December 29, 2025 17:19
@github-actions github-actions bot mentioned this pull request Dec 29, 2025
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3 participants