flow.txt
hello
require('flow.txt'); // hello
fs.writeSync('flow.txt', 'helloagain');
require('flow.txt'); // hello
delete require.cache['flow.txt'];
require('flow.txt'); // helloagain
flow.txt
hello
require('flow.txt'); // hello
fs.writeSync('flow.txt', 'helloagain');
require('flow.txt'); // hello
delete require.cache['flow.txt'];
require('flow.txt'); // helloagain