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Goal Develop a stable, repeatable testing workflow in Vitest 2.0 where each test file runs with a clean module cache and isolated global state, while keeping startup time and memory usage within acceptable limits. Constraints & Uncertainty The default pool is threads , which shares the Node.js module cache within a worker but does not automatically reset
When the CoffeeScript Node extension ( coffeescript/register ) is used, the compiler caches the generated JavaScript in Node's module cache so that subsequent require calls return the same compiled output. The goal is to determine whether the extension provides a mechanism to automatically refresh this cached JavaScript when the source .coffee file changes,
Swift's incremental build system caches compiled modules as .swiftmodule files to avoid recompiling unchanged dependencies. In recent Swift toolchains, the compiler evaluates file timestamps and dependency hashes to decide whether a cached module remains valid. A known area of uncertainty involves changes confined to a module's private implementation—such as
coffeescript
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