fix: Use a separate cached PostCSS config for each CSS plugin instantiation #3985
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Description
The PostCSS config is currently cached once for the entire lifetime of the Node process. This assumes that, for a given Node process, Vite only runs on a single project. That assumption breaks for example when using Vite's API to preview different projects, each with their own PostCSS config.
This PR moves the
cachedPostcssConfig
variable to thecssPlugin
function scope, so that each Vite server has its own independently cached value (enabling multiple projects to run in parallel).Additional context
What is the purpose of this pull request?
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fixes #123
).