Compiles a template string to a function string. Most often users just use compile(), which calls compileToString and creates a new function using the result

Example

compileToString("Hi <%= it.user %>", eta.config)
// "var tR='',include=E.include.bind(E),includeFile=E.includeFile.bind(E);tR+='Hi ';tR+=E.e(it.user);if(cb){cb(null,tR)} return tR"