Using the Handlebars precompiler, you can precompile your
Handlebars templates to save time on the client and reduce
the required runtime size of the handlebars library.
First, you will need to install node and npm. On OS X:
$ brew install node
This assumes you already have Homebrew installed. If not,
Next, install the Handlebars npm package.
$ npm install handlebars -g
-g flag installs the package globally,
so it can be used in any project.
Now, you're ready to use the precompiler:
$ handlebars <input> -f <output>
The compiler will insert templates in
If your input file is
person.handlebars, the compiler will
insert it at
Handlebars.templates.person. This template will
be a function that may be directly executed in the same manner as templates
compiled locally. I.e.
If you're working with precompiled templates, you don't need to ship
the compiler with your deployed application. Instead, you can use the
smaller "runtime" build.
In addition to reducing the download size, eliminating client-side
compilation will significantly speed up boot time, as compilation
is the most expensive part of Handlebars.
Because you are precompiling templates, you can also apply several
optimization to the compiler. The first allows you to specify a
list of the known helpers to the compiler
handlebars <input> -f <output> -k each -k if -k unless
The Handlebars compiler will optimize accesses to those helpers for