Child Process Node.js with CasperJs: Cannot find module 'casper'; require statement

Question

I am not sure if I am missing a general understanding of the 'require' but if I try to include casperJs into a node child process I cannot use the module casper.

parent.js

var exec = require('child_process').exec;
for (var i = 0; i < 3; i++) {
    exec('node child.js', {},
        function(err, stdout, stderr) {
            if (err) {
                throw err;
            }
            console.log(stdout);
        }
    );
};

child.js

var casper = require('casper').create({
    timeout: 180000
});
var meteorUrl = "http://hiddenURL/";

casper.start(meteorUrl, function(response) {
    var _status = response.status;
    if (_status == '200') {
        this.echo("Page: " + meteorUrl + " loaded.");
    } else {
        this.die("Page not loaded! [" + _status + "]", 1);
    }
});

casper.run();

Terminal

$ casperjs --version
1.1.0-beta3

$ casperjs child.js
Page: http://hiddenURL/ loaded.

$ node parent.js
Error: Cannot find module 'casper'

Answer 1

CasperJS is not a node.js module which is what the error message is actually saying. It is a standalone program that is only installed through NPM for convenience.

Change

exec('node child.js', {},

to

exec('casperjs child.js', {},