NotAShelf/nix-evaluator-stats
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Signed-off-by: NotAShelf <raf@notashelf.dev>
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# @ns/core
Core types and parsing logic for Nix evaluator statistics. This package is
framework-agnostic and can be used in any JavaScript/TypeScript environment.
## Usage
```typescript
import { calculateChange, parseStats, StatsData } from "@ns/core";
// Parse raw stats from Nix
const raw = JSON.parse(statsJson);
const stats: StatsData = parseStats(raw);
console.log(`CPU Time: ${stats.cpuTime}s`);
console.log(`Expressions: ${stats.nrExprs}`);
// Compare two values
const change = calculateChange(stats.nrThunks, previousStats.nrThunks);
console.log(`Thunks changed by ${change.percent.toFixed(2)}%`);
```
## Version Compatibility
The parser handles different Nix implementations (Nix, Lix, Snix, etc.) by
checking for field existence in the raw JSON, since not all implementations
expose the same statistics.