示例

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

案例

目标

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

包

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

环境

node

创建时间

2026-08-17T01:45:46Z

常见的想当然

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.

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 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

文件

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs
• test_explore.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 · 2026-08-17 · ed25519:d91480838ac982c9