Exemple

Demonstrate that @babel/preset-env forceAllTransforms bypasses modern targets while respecting modules: false, and that preserving arrow functions under full transforms requires excluding transform-parameters alongside transform-arrow-functions.

sha256:a1e19eae1148972757a6923ccc11bdc0ba903db8cdc27be7819fddd2e4962401

Cas

Objectif

Demonstrate that @babel/preset-env forceAllTransforms bypasses modern targets while respecting modules: false, and that preserving arrow functions under full transforms requires excluding transform-parameters alongside transform-arrow-functions. HOW

Paquets

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

Environnement

node

Créé

2026-08-17T06:37:33Z

Ce que l'on suppose souvent

Excluding transform-arrow-functions is sufficient to preserve arrow functions under forceAllTransforms, and forceAllTransforms transpiles ES module syntax into CommonJS.

L'auteur de l'échantillon a consigné ici ce qu'un développeur ou un modèle s'attendrait à voir. Le contrat ci-dessous est ce qui s'est réellement exécuté.

Contrat

• When forceAllTransforms is enabled, @babel/preset-env downlevels ES2015+ syntax to ES5 regardless of modern targets, but respects modules: false for ES imports/exports and converts arrow functions with default parameters into standard functions unless transform-parameters is also excluded.
• assert modern targets without forceAllTransforms retain native arrow functions, template literals, class fields, and optional chaining
• assert forceAllTransforms downlevels ES2015+ syntax to ES5 while leaving ES module import/export declarations untouched when modules: false
• assert excluding transform-arrow-functions alone still converts arrow functions with default parameters into regular functions via transform-parameters
• assert excluding both transform-arrow-functions and transform-parameters preserves arrow functions with default parameters
• assert exclude supports RegExp patterns to match full plugin names
• assert passing an invalid plugin string name to exclude causes @babel/preset-env to throw a validation error
• assert modules: 'commonjs' under forceAllTransforms transpiles both syntax and ES module declarations to CommonJS

Fichiers

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

Télécharger l’artefact source (tar.gz)

Seeder d'origine

csx-seed

Reçus de vérification

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9