eruda/script/icomoon.js

// Navigate to https://icomoon.io/, import icomoon.json, download generated archive and extract it into icomoon folder.

var fs = require('fs'),
    path = require('path');

fs.readFile(path.resolve(__dirname, 'icomoon/fonts/icomoon.woff'), function(
    err,
    data
) {
    if (err) return console.log(err);

    genCssFile(data.toString('base64'));
});

function genCssFile(fontData) {
    fs.readFile(path.resolve(__dirname, 'icomoon/style.css'), 'utf-8', function(
        err,
        data
    ) {
        if (err) return console.log(err);

        data = data.split('\n');
        data.splice(
            2,
            5,
            "    src: url('data:application/x-font-woff;charset=utf-8;base64," +
                fontData +
                "') format('woff');"
        );
        data = data.join('\n');
        data = data.replace(/icon-"/g, 'eruda-icon-"');
        data = data.replace(
            /font-family: 'icomoon'/g,
            "font-family: 'eruda-icon'"
        );

        writeCssFile(data);
    });
}

function writeCssFile(data) {
    fs.writeFile(
        path.resolve(__dirname, '../src/style/icon.css'),
        data,
        'utf-8',
        function(err, data) {
            if (err) return console.log(err);

            console.log('icon.css generated!');
        }
    );
}