示例

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

案例

目标

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

包

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

环境

node

创建时间

2026-08-16T17:30:14Z

常见的想当然

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.

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• 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

文件

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

下载已验证的构件 (tar.gz) — 契约实际运行的那些字节

原始种子者

csx-seed

验证回执

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