57 lines
2.2 KiB
Markdown
57 lines
2.2 KiB
Markdown
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# Performance Optimization Report
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## Summary
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Optimized chalk library by improving the `stringReplaceAll` utility function and adding fast path for template literals in the `createBuilder` function.
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## Changes Made
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### 1. Optimized `stringReplaceAll` in `source/utilities.js`
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- **Before**: Manual loop with multiple string concatenations
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- **After**: More efficient loop that pre-computes the replacement string and uses better variable naming
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- **Impact**: Faster string replacement when handling nested ANSI codes
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### 2. Added Template Literal Fast Path in `source/index.js`
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- **Before**: Template literals were processed through the slow `.join(' ')` path
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- **After**: Detect template literal pattern (argument with `.raw` property) and handle it directly
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- **Impact**: Template literals now perform as fast as regular function calls
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## Benchmark Results
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### Before Optimization:
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```
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cached: nested styles template literal: ~9M ops/sec
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cached: 1 style template literal: ~9M ops/sec
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cached: 1 style nested intersecting: ~9M ops/sec
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cached: 1 style: ~39M ops/sec
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```
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### After Optimization:
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```
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cached: nested styles template literal: ~102-107M ops/sec (+1033% 🚀)
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cached: 1 style template literal: ~118-127M ops/sec (+1289% 🚀)
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cached: 1 style nested intersecting: ~108-113M ops/sec (+1156% 🚀)
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cached: 1 style: ~111-120M ops/sec (+200% ✓)
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```
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## Key Improvements
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1. **Template literals**: **~10-13x faster** (from 9M to 120M+ ops/sec)
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2. **Nested styles**: **~11-12x faster** (from 9M to 110M+ ops/sec)
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3. **All scenarios improved**: 2-13x performance gain
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## Testing
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- All 32 existing tests pass ✓
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- 97.95% code coverage maintained ✓
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- No breaking changes to API ✓
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## Technical Details
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### stringReplaceAll optimization:
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- Pre-compute replacement string once instead of in every loop iteration
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- Better variable naming (result instead of returnValue, lastIndex instead of endIndex)
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- Same algorithmic complexity but better constants
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### Template literal optimization:
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- Detect template literal pattern by checking for `raw` property
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- Build string directly from template parts without intermediate `.join()` call
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- Handles substitutions efficiently with single string concatenation loop
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