fs.readFileSync is not a function Meteor, React

I'm getting a 'fs.readFileSync is not a function' in Chrome debugger after trying to call readFileSync();

I call it...

const fs = require('fs');

call the function...

let content = fs.readFileSync('/path/to/my/file.stuff');

And attempt to display content..

console.log(content);

I get nothing. When I do...

console.log(fs);

I appear to get a generic javascript object... I'm completely stuck.

Meteor version: 1.5.1 npm version: 3.10.10 node version: v6.10.1