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Merge Vitest configurations with mergeConfig to prove array options are concatenated, nested poolOptions are merged, scalar settings overwrite base values, and callback configs throw synchronously.

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CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17

ゴール: Merge Vitest configurations with mergeConfig to prove array options are concatenated, nested poolOptions are merged, scalar settings overwrite base values, and callback configs throw synchronously. HOW
パッケージ: vitest 3.2.7
環境: node
作成日: 2026-08-17T13:23:39Z

mergeConfig replaces array options like test.include and test.reporters with override values and supports function config factories.

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。

mergeConfig concatenates array options like test.include, test.exclude, and test.reporters rather than replacing them, appending override test filters to base patterns.
mergeConfig coerces scalar string values to arrays and appends them when merged with existing array options like test.setupFiles.
mergeConfig deeply merges nested configuration objects such as test.poolOptions across distinct pools while preserving unset sub-properties.
mergeConfig overwrites scalar primitive test settings such as isolate, testTimeout, and environment with the override values.
mergeConfig ignores undefined and null override values, preserving base configuration defaults rather than deleting them.
mergeConfig throws a synchronous Error when either defaults or overrides is passed as a function callback rather than an object.

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