runner: use dynamic-rerequire to reload applications #31
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Related to #19. Significantly improves the time it takes to reload applications after a change. Technically, this is a breaking change for the runner. Apps may need to add a `before-reload` function to their "dynamic.rkt" module and instruct libraries like deta to be more lenient.
Reloading will already surface any compilation errors that occur.
Also, put a mutex around compilation.
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Related to #19. Significantly improves the time it takes to reload
applications after a change.
Technically, this is a breaking change for the runner. Apps may need
to add a
before-reloadfunction to their "dynamic.rkt" module andinstruct libraries like deta to be more lenient.