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docs: clarify server.deps.fallbackCJS heuristic (#9479)
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docs/config/server.md
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docs/config/server.md
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- **Type:** `boolean`
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- **Default:** `false`
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When a dependency is a valid ESM package, try to guess the cjs version based on the path. This might be helpful, if a dependency has the wrong ESM file.
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When enabled, Vitest will try to guess a CommonJS build for an ESM entry by checking a few common CJS/UMD file name and folder patterns (like `.mjs`, `.umd.js`, `.cjs.js`, `umd/`, `cjs/`, `lib/`).
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This might potentially cause some misalignment if a package has different logic in ESM and CJS mode.
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This is a best-effort heuristic to work around confusing or incorrect ESM/CJS packaging and may not work for all dependencies.