Beispiel

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

Fall

Ziel

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

Pakete

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

Umgebung

node

Erstellt

2026-08-17T01:45:46Z

Häufige Annahme

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.

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 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

Dateien

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