If you name your livescript files like <desired_file_name>.ls, this build system will automatically generate the desired files.

lsc.sublime-build

{
    "cmd": ["lsc", "${file_path}/${file_name}", ">", "${file_path}/${file_base_name}"],
    "file_regex": "^(..[^:]*):([0-9]+):?([0-9]+)?:? (.*)$",
    "working_dir": "${file_path}",
    "path": "D:/msys64/mingw64/bin/",
    "shell": true
}