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In a monorepo setup, a dependency may be a linked package from the same repo. Vite automatically detects dependencies that are not resolved from `node_modules` and treats the linked dep as source code. It will not attempt to bundle the linked dep, and will analyze the linked dep's dependency list instead.
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However, this requires the linked dep to be exported as ESM. If not, you can add the dependency to [`optimizeDeps.include`](/config/#optimizedeps-include) and [`build.commonjsOptions.include`](/config/#build-commonjsoptions) in your config.
Due to differences in linked dependency resolution, transitive dependencies can deduplicated incorrectly, causing issues when used in runtime. If you stumble on this issue, use `npm pack` on the linked dependency to fix it.
In some bundlers, the dev server runs the bundling in memory so that it only needs to invalidate part of its module graph when a file changes, but it still needs to re-construct the entire bundle and reload the web page. Reconstructing the bundle can be expensive, and reloading the page blows away the current state of the application. This is why some bundlers support Hot Module Replacement (HMR): allowing a module to "hot replace" itself without affecting the rest of the page. This greatly improves DX - however, in practice we've found that even HMR update speed deteriorates significantly as the size of the application grows.
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在 Vite 中,HMR 是在原生 ESM 上执行的。当编辑一个文件时,Vite 只需要精确地使已编辑的模块与其最近的 HMR 边界之间的链失活<sup>[[1]](#footnote-1)</sup>(大多数时候只是模块本身),使得无论应用大小如何,HMR 始终能保持快速更新。
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