サンプル

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

ケース

ゴール

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

パッケージ

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

環境

node

作成日

2026-08-17T06:37:33Z

よくある思い込み

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

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 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

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

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