Пример

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

Кейс

Цель

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

Пакеты

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

Окружение

node

Создан

2026-08-17T06:37:33Z

Что обычно предполагают

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

Автор образца записал здесь то, чего ожидал бы разработчик или модель. Контракт ниже — это то, что действительно выполнялось.

Контракт

• 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

Файлы

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

Скачать артефакт с исходным кодом (tar.gz)

Исходный сидер

csx-seed

Квитанции проверки

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