a.js

// current implementation of JavaScriptHtmlTemplatePipeline

(function(d) {
var addTemplate = function(id, content) {
    var script = d.createElement('script');
    script.type = 'text/html';
    script.id = id;
    if (typeof script.textContent !== 'undefined') {
        script.textContent = content;
    } else {
        script.innerText = content;
    }
    var x = d.getElementsByTagName('script')[0];
    x.parentNode.insertBefore(script, x);
};
addTemplate("todo/index","<div id=\"todo-container\">\r\n    Todo\r\n</div>");
}(document));

b.js

JST || (JST = {});
JST["todo/index"] = "<div id=\"todo-container\">\r\n    Todo\r\n</div>";

c.js

// allow source to be preprocessed too

JST || (JST = {});
JST["todo/index"] = ....compiled template from server (so no need to compile it in client side)...;