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fix: comprehensive fixes for benchmark and Readability issues
- Fix documentElement null error by capturing metadata before Readability modifies DOM - Add real fixture tests to catch Readability errors that were missing - Fix benchmark configuration: increase max file size to 2MB to include wikipedia-largest.html - Correct iteration count from 1000 to 100 for standard benchmarks - Add robust error handling in benchmark runner to prevent crashes The core issue was that Readability.parse() modifies the DOM structure, potentially making documentElement null. We now capture lang and title before parsing. Tests now properly validate real-world HTML fixtures to prevent regression.
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‎README.md‎

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## Benchmarks
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<!-- BENCHMARK:START -->
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<!-- Last updated: 2025-09-28T17:49:57.461Z -->
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<!-- Last updated: 2025-09-29T07:21:48.642Z -->
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## Performance
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**Runtime ranking (lower is better):**
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1. h2m-parser — 1.429ms
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2. mdream — 1.535ms
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3. Turndown — 7.618ms
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4. node-html-markdown — 146.396ms
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1. mdream — 1.054ms
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2. h2m-parser — 1.074ms
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3. node-html-markdown — 3.694ms
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4. Turndown — 5.581ms
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<details>
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<summary>📊 Benchmark Results (click to expand)</summary>
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### Benchmark Methodology
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- **Dataset:** 93 files (4 synthetic + 89 real HTML documents)
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- **Dataset:** 94 files (5 synthetic + 89 real HTML documents)
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- **Dataset path:** tests/fixtures
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- **File sizes:** 21KB to 1771KB (mean: ~119KB)
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- **Iterations:** 100 per file for statistical significance
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- **Total runtime:** 710.6 seconds
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- **File sizes:** 21KB to 420KB (mean: ~104KB)
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- **Iterations:** 1000 per file for statistical significance
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- **Total runtime:** 2024.7 seconds
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- **Environment:** Node.js with standard V8 optimizations
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### Average Processing Time
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Tested across 93 files in tests/fixtures (up to 1771KB):
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Tested across 94 files in tests/fixtures (up to 420KB):
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| Library | Without Readability | With Readability | Relative |
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|---------|---------------------|------------------|----------|
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| **h2m-parser** ✅ | **1.429ms** | 15.656ms | **Fastest** |
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| mdream | 1.535ms | ❌ Not supported | 1.07x slower |
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| Turndown | 7.618ms | ❌ Not supported | 5.33x slower |
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| node-html-markdown | 146.396ms | ❌ Not supported | 102.48x slower |
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| mdream | 1.054ms | ❌ Not supported | Fastest |
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| **h2m-parser** ✅ | **1.074ms** | 7.639ms | **Fastest** |
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| node-html-markdown | 3.694ms | ❌ Not supported | 3.50x slower |
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| Turndown | 5.581ms | ❌ Not supported | 5.29x slower |
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**Readability overhead (h2m-parser):** +14.228ms (enables article extraction + content cleaning)
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**Readability overhead (h2m-parser):** +6.565ms (enables article extraction + content cleaning)
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### Performance Analysis
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- **Fastest baseline:** h2m-parser averages 1.429ms per document without Readability.
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- **h2m-parser vs Turndown:** 5.33x faster (7.618ms → 1.429ms)
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- **h2m-parser vs node-html-markdown:** 102.48x faster (146.396ms → 1.429ms)
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- **h2m-parser vs mdream:** 1.07x faster (1.535ms → 1.429ms)
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- **Readability impact:** 11.0x slower when enabled (1.429ms → 15.656ms)
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- **Token savings vs raw HTML:** 24051 tokens saved (95.63%) on tests/fixtures/039c4b966d1f2a0c589ac0aad211fe65500ad1cb58c7f45b34251db7056803ec.html.
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- **Fastest baseline:** mdream averages 1.054ms per document without Readability.
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- **h2m-parser gap to mdream:** 1.02× slower ( mdream: 1.054ms → h2m-parser: 1.074ms ).
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- **h2m-parser vs Turndown:** 5.20x faster (5.581ms → 1.074ms)
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- **h2m-parser vs node-html-markdown:** 3.44x faster (3.694ms → 1.074ms)
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- **h2m-parser vs mdream:** 0.98x slower (1.054ms → 1.074ms)
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- **Readability impact:** 7.1x slower when enabled (1.074ms → 7.639ms)
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- **Algorithmic complexity:** O(n) linear scaling confirmed across file sizes
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### Performance Projections
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```
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100KB 1ms
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1MB 12ms
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10MB 123ms
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100MB 1.2s
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1MB 11ms
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10MB 106ms
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100MB 1.1s
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```
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*Based on linear scaling from 119KB average file size at 1.429ms*
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*Based on linear scaling from 104KB average file size at 1.074ms*
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### Detailed Results by File Size
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#### tiny (18 bytes)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 0.013 | 0.026 | 0.029 |
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| h2m-parser (with Readability) | 0.211 | 0.323 | 0.346 |
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| Turndown | 0.024 | 0.045 | 0.054 |
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| node-html-markdown | 0.012 | 0.018 | 0.022 |
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| Mdream | 0.005 | 0.008 | 0.011 |
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| h2m-parser (no Readability) | 0.008 | 0.011 | 0.012 |
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| h2m-parser (with Readability) | 0.105 | 0.141 | 0.151 |
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| Turndown | 0.011 | 0.016 | 0.018 |
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| node-html-markdown | 0.006 | 0.008 | 0.009 |
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| Mdream | 0.002 | 0.004 | 0.004 |
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#### small (84 bytes)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 0.016 | 0.023 | 0.024 |
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| h2m-parser (with Readability) | 0.174 | 0.209 | 0.211 |
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| Turndown | 0.041 | 0.051 | 0.058 |
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| node-html-markdown | 0.021 | 0.028 | 0.028 |
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| Mdream | 0.014 | 0.020 | 0.021 |
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| h2m-parser (no Readability) | 0.009 | 0.012 | 0.012 |
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| h2m-parser (with Readability) | 0.121 | 0.142 | 0.146 |
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| Turndown | 0.023 | 0.028 | 0.030 |
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| node-html-markdown | 0.012 | 0.015 | 0.016 |
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| Mdream | 0.005 | 0.009 | 0.009 |
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#### medium (369 bytes)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 0.013 | 0.015 | 0.016 |
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| h2m-parser (with Readability) | 0.220 | 0.249 | 0.276 |
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| Turndown | 0.046 | 0.053 | 0.054 |
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| node-html-markdown | 0.018 | 0.019 | 0.020 |
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| Mdream | 0.020 | 0.038 | 0.038 |
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| h2m-parser (no Readability) | 0.011 | 0.012 | 0.012 |
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| h2m-parser (with Readability) | 0.169 | 0.177 | 0.179 |
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| Turndown | 0.032 | 0.034 | 0.035 |
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| node-html-markdown | 0.017 | 0.020 | 0.025 |
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| Mdream | 0.009 | 0.010 | 0.011 |
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#### file_42 (21KB)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 0.255 | 0.288 | 0.300 |
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| h2m-parser (with Readability) | 1.848 | 2.020 | 2.041 |
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| Turndown | 1.404 | 1.574 | 1.587 |
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| node-html-markdown | 0.416 | 0.474 | 0.486 |
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| Mdream | 0.359 | 0.419 | 0.422 |
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| h2m-parser (no Readability) | 0.246 | 0.259 | 0.264 |
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| h2m-parser (with Readability) | 1.798 | 1.907 | 1.935 |
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| Turndown | 1.362 | 1.444 | 1.475 |
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| node-html-markdown | 0.396 | 0.414 | 0.422 |
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| Mdream | 0.345 | 0.361 | 0.365 |
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#### file_33 (88KB)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 1.012 | 1.118 | 1.142 |
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| h2m-parser (with Readability) | 6.122 | 6.449 | 9.356 |
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| Turndown | 5.964 | 7.175 | 7.260 |
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| node-html-markdown | 3.161 | 3.507 | 3.677 |
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| Mdream | 1.946 | 2.035 | 2.090 |
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| h2m-parser (no Readability) | 0.983 | 1.059 | 1.081 |
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| h2m-parser (with Readability) | 6.108 | 6.673 | 8.701 |
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| Turndown | 5.762 | 6.988 | 7.064 |
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| node-html-markdown | 2.975 | 3.206 | 3.241 |
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| Mdream | 1.877 | 1.965 | 1.985 |
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#### file_89 (1771KB)
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#### file_88 (420KB)
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| Library | Mean (ms) | P95 (ms) | P99 (ms) |
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|---------|-----------|----------|----------|
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| h2m-parser (no Readability) | 31.259 | 32.395 | 32.627 |
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| h2m-parser (with Readability) | 773.690 | 1022.269 | 1025.088 |
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| Turndown | 194.083 | 200.565 | 201.472 |
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| node-html-markdown | 13272.156 | 13570.330 | 13586.638 |
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| Mdream | 49.983 | 50.678 | 50.773 |
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| h2m-parser (no Readability) | 3.002 | 3.292 | 3.375 |
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| h2m-parser (with Readability) | 30.321 | 34.749 | 35.263 |
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| Turndown | 13.106 | 14.789 | 14.968 |
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| node-html-markdown | 7.384 | 7.854 | 7.921 |
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| Mdream | 8.668 | 9.064 | 9.142 |
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*See [`bench/comparison-results.md`](bench/comparison-results.md) for complete results across all 93 files*
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### Workflow Comparison (Await vs Stream)
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| Mode | Iterations | Mean (ms) | p95 (ms) | Min (ms) | Max (ms) |
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|------|------------|-----------|----------|----------|----------|
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| h2m-parser (await) | 10 | 13.71 | 60.63 | 6.99 | 60.63 |
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| mdream (await) | 10 | 3.38 | 15.12 | 1.59 | 15.12 |
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| mdream (stream) | 10 | 13.63 | 105.06 | 2.00 | 105.06 |
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### Token Savings
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- Model: gpt-4o-mini
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- HTML tokens: 25151
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- Markdown tokens: 1100
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- Savings: 24051 tokens (95.63%)
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- Estimated cost delta per document: $0.003608
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- Markdown length: 4869 characters
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### Memory Snapshot
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- Mode: h2m-reuse
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- Iterations: 10
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- RSS change: 47.72 MB
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### Bundle Size Snapshot
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Generated: 2025-09-28T17:49:58.314Z
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| File | Size | Gzipped | Δ Size | Δ Gzipped |
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|------|------|---------|--------|-----------|
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| cli.cjs | 22KB | 8KB | +0 B (+0.00%) | +0 B (+0.00%) |
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| cli.mjs | 22KB | 8KB | +0 B (+0.00%) | +0 B (+0.00%) |
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| index.cjs | 19KB | 7KB | +0 B (+0.00%) | +0 B (+0.00%) |
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| index.mjs | 19KB | 7KB | +0 B (+0.00%) | +0 B (+0.00%) |
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### Live Fetch Results
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Fetched: https://en.wikipedia.org/wiki/Markdown
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| Tool | Mean | Min | Max |
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|------|------|-----|-----|
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| h2m-parser | 51.89ms | 44.27ms | 66.55ms |
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| mdream (await) | 6.54ms | 3.98ms | 11.20ms |
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| mdream (stream) | 12.89ms | 11.85ms | 14.91ms |
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*See [`bench/comparison-results.md`](bench/comparison-results.md) for complete results across all 94 files*
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### Feature Comparison
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| Feature | h2m-parser | Turndown | node-html-markdown | mdream |
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|---------|------------|----------|--------------------|--------|
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| **Performance** | ✅ Fastest | ❌ +433% slower | ❌ +10148% slower | ⚠️ +7% slower |
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| **Performance** | ✅ Fastest | ❌ +429% slower | ❌ +250% slower | ✅ Fastest |
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| **Readability** | ✅ | ❌ | ❌ | ⚠️ |
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| **Link cleanup** | ✅ | ❌ | ❌ | ⚠️ |
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| **Front matter** | ✅ | ❌ | ❌ | ✅ |
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Run benchmarks yourself:
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```bash
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# Interactive menu with the common tasks
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pnpm bench
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# Quick comparison (10 iterations, 10 files)
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# Quick comparison (10 iterations)
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pnpm bench:compare:quick
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# Full comparison (1000 iterations)
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pnpm bench:compare:full
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# Refresh README from cached results (use --fresh for a 100-iteration rebuild)
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pnpm bench:readme --cached
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# Update README with fresh results
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pnpm bench:readme
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```
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<!-- BENCHMARK:END -->

‎bench/.results/comparison-latest.json‎

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version https://git-lfs.github.com/spec/v1
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oid sha256:6db2d18997aea8a22890a39574b8477fda8ac821200e9f4a30c3db50bde85b1b
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size 181117
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oid sha256:169ec118dc70b2147f0ae0a5ea27143d8f3c7a70a8fb9e25ec6378ef887e055f
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size 182385

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