サンプル

rollup 4.34.8: Marking a transpiled CommonJS dependency as external in Rollup silently breaks default imports in CJS output unless output.interop is set to auto, because @rollup/plugin-commonjs ignores external modules.

検証済みサンプル — npm rollup 4.34.8: Marking a transpiled CommonJS dependency as external in Rollup silently breaks default imports in CJS output unless…

sha256:6bd9e4aeb00bbe86cb0245f6c6955ae8ec7421dba24da3b8401f6307646e0ad8

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 node linux x64 node node npm

環境	コントラクト	ステージ	実行日
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1	2026-08-15
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1	2026-08-18

HOW

ゴール: Marking a transpiled CommonJS dependency as external in Rollup silently breaks default imports in CJS output unless output.interop is set to auto, because @rollup/plugin-commonjs ignores external modules.
パッケージ: rollup 4.34.8

@rollup/plugin-commonjs 28.0.2
シンボル: rollup
external
output.interop
@rollup/plugin-commonjs
環境: node
作成日: 2026-08-15T17:12:52Z

assert @rollup/plugin-commonjs emits default import without helper synthesis for external CJS require in ESM output
assert Rollup default interop leaves transpiled external CJS default export wrapped in __esModule object in CJS output
assert output.interop 'auto' generates _interopDefault and properly unwraps default export at runtime
assert Rollup preserves verbatim named ESM import for external CJS dependencies in ESM output