Bourbon 4 -> Bourbon 5 find replace script for replacing em()-calls with a pre-calculated value.

findReplace.js

var glob = require('glob');
var fs = require('fs');

// Find files to replace in.
glob('src/sass/**/*.scss', function(err, files) {
    if (err) { throw err; }
    files.forEach(function(item, index, array) {
        fs.readFile(item, 'utf8', function (err, data) {
            if (err) {
                return console.log(err);
            }

            // Perform replacement.
            var result = data.replace(/em\( ?([\d]+) ?px ?\)/g, function(match, value) {
                return value / 16 + 'em';
            });

            fs.writeFile(item, result, 'utf8', function (err) {
                if (err) return console.log(err);
            });
        });
      });
});