cannot resolve module 'fs' on edgejs

i am using latest edgejs(6.5.1) in my node project. but when i use edge in my project,

var edge = require('edge');

i am getting this error "cannot resolve module 'fs' " later when i checked the edge.js file i see that edge is using 'fs'

var fs = require('fs') , path = require('path') , builtEdge = path.resolve(__dirname, '../build/Release/' + (process.env.EDGE_USE_CORECLR || !fs.existsSync(path.resolve(__dirname, '../build/Release/edge_nativeclr.node')) ? 'edge_coreclr.node' : 'edge_nativeclr.node')) , edge;

How can i fix this error?

via Kapoor