code: function die(reason = "", error = null, exitCode = 0){
  	reason = (reason || "").trim();
  	
  	// ANSI escape sequences (disabled if output is redirected)
  	const [reset,, underline,, noUnderline, red] = process.stderr.isTTY
  		? [0, 1, 4, 22, 24, [31, 9, 38]].map(s => `\x1B[${ Array.isArray(s) ? s.join(";") : s}m`)
  		: Array.of("", 40);
  	
  	if(error){
  		const {inspect} = require("util");
  		process.stderr.write(red + inspect(error) + reset + "\n\n");
  	}
  	
  	// Underline all occurrences of target-file's name
  	const target = underline + file + noUnderline;
  	
  	// "Not found" -> "package.json not found"
  	if(reason && !reason.match(file))
  		reason = (file + " ")
  			+ reason[0].toLowerCase()
  			+ reason.substr(1);
  	
  	// Pedantic polishes
  	reason = reason
  		.replace(/(?:\r\n|\s)+/g,  " ")
  		.replace(/^\s+|[.!]*\s*$/g, "")
  		.replace(/^(?!\.$)/, ": ")
  		.replace(file, target);
  	
  	const output = `${red}Unable to finish installing Atom-Mocha${reason}${reset}
  	
  	The following field must be added to your project's ${target} file:
  	
  		"${key}": "${value}"
  	
  	See ${underline}README.md${reset} for setup instructions.
  	
  	`.replace(/^\t/gm, "");
  	process.stderr.write(output);
  	process.exit(exitCode);
  }
docs: Print an error message to the standard error stream, then quit.
  
  @param {String} [reason=""] - Brief description of the error.
  @param {Error} [error=null] - Possible error object preceding output
  @param {Number} [exitCode=1] - Error code to exit with.
  @private