サンプル

Configuring treeshake.moduleSideEffects to false silently removes bare side-effect imports lacking consumed bindings, whereas setting it to 'no-external' preserves internal side-effect modules while pruning external ones.

sha256:92601fd5622eb4523c4c39713473c67395bc60dbed071830173bede138b89a13

ケース

ゴール

Configuring treeshake.moduleSideEffects to false silently removes bare side-effect imports lacking consumed bindings, whereas setting it to 'no-external' preserves internal side-effect modules while pruning external ones. HOW

パッケージ

rollup 4.34.8

環境

node

作成日

2026-08-17T11:12:35Z

よくある思い込み

A bare import with no specifiers, such as import './polyfill.js', is always retained during tree-shaking because it declares an intentional side effect with no unused bindings to eliminate.

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

• Setting treeshake: { moduleSideEffects: false } causes Rollup to strip bare side-effect imports that have no consumed exports, whereas treeshake: { moduleSideEffects: 'no-external' } retains internal side-effect imports and strips unused external ones.
• Executing a bundle built with moduleSideEffects: false leaves global state uninitialized by the stripped polyfill, while executing a bundle built with moduleSideEffects: 'no-external' triggers the top-level side effects on module load.
• Default tree-shaking (moduleSideEffects: true) retains both internal and external side-effect imports unconditionally.

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