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FS.mkdir() will throw a javascript exception if the scratch directory already exists, so catch/ignore that. Wrap the rest of the scratch i/o in a try/catch block; the event will only send if everything works out. Wrap some calls from Javascript to the C runtime's free() in an EMSCRIPTEN_KEEPALIVE function, so that the compiler doesn't optimize the function out and crash at runtime. Fixes #14999.