intro.js

//whitespaces added for clarification
(function(){
    dust.register("intro",body_0);

    function body_0(chk,ctx){
        return chk.write("Hello ").reference(ctx._get(false, ["name"]),ctx,"h").write("!");
    }

    return body_0;
})();

readTemplateFromDiskAndRender.js

var fs = require('fs');

var dust = require('dustjs-linkedin');

var tmplSource = fs.readFileSync(__dirname + '/intro.js').toString();

var tmpl = createTemplate(tmplSource, 'intro');

tmpl({name: 'fooobar'}, function(error, result) {
    console.log(arguments);
});

function createTemplate(tmplSource, name) {
    dust.loadSource(tmplSource);

    return function(data, callback) {
        dust.render(name, data, callback);
    };
}