Beispiel

Demonstrate that @babel/preset-env retains in-memory browserslist configuration caches across transforms, requiring explicit browserslist.clearCaches() when on-disk target files change.

sha256:5230d1d8374292e6b338e3af9d42b2f705868895b5c720d33aec72599fd6f335

Fall

Ziel

Demonstrate that @babel/preset-env retains in-memory browserslist configuration caches across transforms, requiring explicit browserslist.clearCaches() when on-disk target files change. HOW

Pakete

@babel/preset-env 7.29.7 @babel/core 7.29.7 browserslist 4.28.8

Umgebung

node

Erstellt

2026-08-16T17:30:14Z

Häufige Annahme

Modifying .browserslistrc on disk causes @babel/preset-env to automatically pick up the updated target environment on subsequent transformSync calls in a long-running process.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• When .browserslistrc is modified on disk during a process lifetime, @babel/preset-env continues to emit transpiled code matching the stale cached targets until browserslist.clearCaches() is explicitly invoked.
• assert modifying .browserslistrc on disk without clearing caches produces output transpiled against stale cached targets
• assert browserslist.clearCaches() evicts memoized config files and forces @babel/preset-env to re-read updated target definitions
• assert passing explicit in-memory targets option bypasses file configuration caching

Dateien

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

Verifiziertes Artefakt herunterladen (tar.gz) — genau die Bytes, gegen die der Contract lief

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9