Access function from require()'d file

Following is a code sample:

test.js:

function print(t){
    console.log(t);
}

index.js:

var test = require('./test.js');
test.print("ok");

I get a test.show is not a function error, and I'm not sure why it won't work if with other npm modules seem to work. I am using browserify to make the require work in the browser.

How does requiring files that are not from a module work in npm?