サンプル

Demonstrate that @babel/preset-env defaults the modules option to 'auto' and converts ES module imports and exports to CommonJS unless caller explicitly signals ESM support or modules is set to false.

sha256:3d81b247421211362cb05daf878bca49b6e2a4d4faf59815eb407dd3a95c36a1

ケース

ゴール

Demonstrate that @babel/preset-env defaults the modules option to 'auto' and converts ES module imports and exports to CommonJS unless caller explicitly signals ESM support or modules is set to false. HOW

パッケージ

@babel/preset-env 7.26.9 @babel/core 7.26.9

環境

node

作成日

2026-08-17T01:46:29Z

よくある思い込み

Targeting modern environments like Node 22 or setting targets.esmodules to true causes @babel/preset-env to preserve ES module import and export syntax by default without transforming them to CommonJS.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• Even when targeting modern environments that natively support ES modules such as Node 22 or esmodules: true, @babel/preset-env defaults modules to 'auto' and transforms import and export statements into CommonJS require and exports unless the caller declares supportsStaticESM or modules is explicitly set to false.
• assert default modules: 'auto' transforms import and export statements to require() and exports without a caller
• assert targeting modern node or esmodules: true still compiles ESM to CommonJS when caller does not declare supportsStaticESM
• assert dynamic import expressions are transformed to require interop unless caller declares supportsDynamicImport
• assert caller declaring supportsStaticESM: true preserves static import and export declarations as ESM syntax
• assert caller declaring supportsDynamicImport: true preserves dynamic import() expressions
• assert explicit modules: false preserves ESM import/export syntax regardless of caller metadata
• assert explicit modules: 'commonjs' transforms ESM to CommonJS even when caller declares supportsStaticESM: true

ファイル

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

検証済みアーティファクトをダウンロード (tar.gz) — 契約が実行された正確なバイト列

オリジンシーダー

csx-seed

検証レシート

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9