サンプル

Demonstrate that @babel/preset-env with default modules auto mode unconditionally transpiles export namespace from syntax regardless of modern targets unless modules is false or the caller asserts namespace support.

sha256:d1c4e6d5b5f6d67cedb5e95f468a787b2752c4c69b6ef2c96f4bf0ecf8b87ed3

ケース

ゴール

Demonstrate that @babel/preset-env with default modules auto mode unconditionally transpiles export namespace from syntax regardless of modern targets unless modules is false or the caller asserts namespace support. HOW

パッケージ

@babel/preset-env 8.0.2 @babel/core 8.0.1

環境

node

作成日

2026-08-17T01:45:46Z

よくある思い込み

Targeting modern JavaScript runtimes with @babel/preset-env and default modules: 'auto' preserves native export * as ns syntax because the targeted environments natively support ECMAScript namespace re-exports.

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

• When modules is unset or 'auto', @babel/preset-env unconditionally injects transform-export-namespace-from and desugars export * as ns statements even when targeting modern runtimes like Chrome 120 or Node 22, unless modules is explicitly false or the caller declares supportsExportNamespaceFrom.
• assert targets: { chrome: '120' } under default modules: 'auto' desugars export * as ns into separate import and export statements
• assert setting modules: false preserves native export * as ns syntax when targets natively support it
• assert caller with supportsStaticESM: true still transpiles export * as ns unless supportsExportNamespaceFrom: true is explicitly provided
• assert caller with supportsExportNamespaceFrom: true preserves native export * as ns syntax
• assert exclude: ['transform-export-namespace-from'] disables the forced transform under modules: 'auto'
• assert targets lacking namespace export support (like Chrome 60) transpile export * as ns even with modules: false

ファイル

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