# jestjs/jest · RepoSense Release & Migration Intelligence

> `[@jest/transform]` Strip TypeScript types with Node when. Drop-in upgrade. Migration: None.

## Metadata
- **Repository URL**: https://github.com/jestjs/jest
- **Primary Package**: `jest` (NPM)
- **Categories**: `BUILD_TOOL`, `TESTING`
- **Latest Version**: `v30.5.2`
- **Semantic Status**: `COMPATIBLE`
- **Bundle Size Impact (unavailable)**: `Size Unavailable`
- **Atom Ingestion Feed**: https://github.com/jestjs/jest/releases.atom

## The Human Context (Plain-English Pitch)
jest is an open-source library and developer tool in the jestjs/jest ecosystem. It saves developers from writing repetitive low-level boilerplate from scratch by providing a battle-tested, open-source implementation ready for production.

## Stage 1 Executive Summary ([Core Change] + [Required Action] + [Migration Effort])
`[@jest/transform]` Strip TypeScript types with Node when. Drop-in upgrade. Migration: None.

## Breaking Changes & Required Actions
- `[@jest/transform]` Strip TypeScript types with Node when no transformer claims a `.ts`, `.mts` or `.cts` file (#16421)
- `[jest-core, jest-haste-map, jest-transform]` Keep `require('../package.json')` external when bundling, so `jest --version` and the transform and haste-map cache keys report the...
- `[jest-each]` Escape a table row's keys before building the `$variable` interpolation `RegExp`, so a column name such as `count(*)` no longer fails the whole table with `Invalid...
- `[@jest/source-map]` Resolve absolute Windows paths in a source map's `sources` and `sourceRoot` again, instead of appending them to the transformed file's directory (#16439)

## Migration Snippet
```ts
npm install jest@30.5.2
```

## Ecosystem Compatibility Matrix & Graph Warnings
- **TypeScript 5.x** [`COMPATIBLE`]: Ships standard TypeScript declaration files without type regressions.

## Zero-Noise Release Timeline
- **v30.5.2** (2026-09-18) [COMPATIBLE]: `[@jest/transform]` Strip TypeScript types with Node when. Drop-in upgrade. Migration: None.

## Upgrade & Migration Q&A (GEO Direct Answers)
### Is jestjs/jest v30.5.2 safe to upgrade in production?
jestjs/jest v30.5.2 is classified as COMPATIBLE (PATCH release). `[@jest/transform]` Strip TypeScript types with Node when. Drop-in upgrade. Migration: None.

### What breaking changes or compatibility risks exist in jestjs/jest v30.5.2?
No breaking API changes or peer dependency conflicts are recorded for jestjs/jest v30.5.2 in the RepoSense compatibility graph.

### What is the bundle size impact of jest v30.5.2?
Measured bundle size telemetry is currently unavailable for jest v30.5.2; verify build output locally before deploying.

### How do I upgrade jest to v30.5.2?
Upgrade jest to v30.5.2 by running "npm install jest@30.5.2" and applying the migration steps: npm install jest@30.5.2