[FSSDK-11787] fix config parsing performance#1080
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Pull Request Overview
This PR optimizes the performance of config parsing by improving how the variationIdMap is populated. Instead of creating new objects through spread operations for each experiment, it modifies the keyBy utility function to accept an optional base object parameter and directly mutates it.
- Modified
keyByfunction to accept an optional base object parameter and mutate it directly - Removed the now-unused
keyByUtilhelper function - Updated all
variationIdMappopulation calls to use the more efficient in-place approach
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| lib/utils/fns/index.ts | Enhanced keyBy function with optional base parameter and removed keyByUtil |
| lib/utils/fns/index.spec.ts | Updated test to use keyBy instead of removed keyByUtil |
| lib/project_config/project_config.ts | Replaced spread operations with direct mutation calls for performance |
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raju-opti
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Sep 2, 2025
Currently, variationIdMap is being populated as follows:
```
projectConfig.variationIdMap = {
...projectConfig.variationIdMap,
...keyBy(experiment.variations, 'id')
};
```
This creates a new objects for each experiment unnecessarily. This causes large slowdown in project config parsing for datafiles containing a large number of experiments containing a large number of variations.
This commit makes this more efficient.
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Summary
Currently, variationIdMap is being populated as follows:
This creates a new objects for each experiment unnecessarily. This causes large slowdown in project config parsing for datafiles containing a large number of experiments containing a large number of variations.
This PR makes this more efficient.
Test plan
Issues