Best way to auto-restart, on file changes? about jasmine-node HOT 4 CLOSED

/**
 * Restart jasmine tests on file changes in spec folder
*/
var fs = require("fs")
,   exec = require('child_process').exec;


var justRunning = false;
fs.watch("spec", {persistent: true}, function(event, filename) {
    if (event === "change" && !justRunning) {
        justRunning = true;
        execJasmineNode(function() {
            justRunning = false;
        });
    }
})
function execJasmineNode(onComplete) {
    exec("jasmine-node --coffee spec", function(err, stdout, stderr) {
        err && console.log(err);
        console.log(stdout);
        console.log(stderr);
        onComplete && onComplete();
    });
}

execJasmineNode();