$ npm install handlebars
$ node
> var Handlebars=require('handlebars');
> Handlebars.compile('foo');
[Function]
> Handlebars.compile(' ');
[Function]
> Handlebars.compile('');
Error: You must pass a string or Handlebars AST to Handlebars.compile. You passed 
    at new Error (unknown source)
    at Error.Handlebars.Exception (/Users/ananthk/tmp/node_modules/handlebars/lib/handlebars/utils.js:8:41)
    at Object.exports.attach.Handlebars.compile (/Users/ananthk/tmp/node_modules/handlebars/lib/handlebars/compiler/compiler.js:1254:11)
    at repl:1:12
    at REPLServer.self.eval (repl.js:109:21)
    at rli.on.self.bufferedCmd (repl.js:258:20)
    at REPLServer.self.eval (repl.js:116:5)
    at Interface.<anonymous> (repl.js:248:12)
    at Interface.EventEmitter.emit (events.js:96:17)
    at Interface._onLine (readline.js:200:10)