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We use the handlebars library to render HTML inside the browser.
Handlebars templates actually get compiled into JS functions that in turn get called via a runtime library.
We install handlebars as a node module, and then we copy the runtime
to the static directory and add some copyright info. The former files
reside in node_modules/handlebars.
In our installation we call ./tools/compile-handlebars-templates
to build the file static/templates/compiled.js. (Then in staging/prod,
that file also gets minified.) For the runtime, in dev mode we serve
it from the static/third directory, and in prod we minify from the
static/third directory.
There are also some node unit tests that use handlebars, and all the
code that they use comes directly from node_modules/handlebars,
including the runtime.