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    \$\begingroup\$ What about writing c or x to the file? Saves 2 bytes. Also, doesn't require`fs` work? \$\endgroup\$ Commented Apr 7, 2016 at 14:43
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    \$\begingroup\$ @Charlie Good point with writing c or x. require`fs` unfortunately doesn't work, because using backticks to call a function calls it with the first arguments as ["fs"] (array, which first and only element is the passed string) instead of "fs" (just the string). Try console.log`test` for example. \$\endgroup\$ Commented Apr 7, 2016 at 15:02