Zarith is an OCaml library that
implements common operations over arbitrary-precision integers and
rationals. It is implemented via a C api that primarily calls out to
Gnu Multiple Precision Arithmetic Library.
Because of that C API, Zarith could not be compiled via Js_of_ocaml
until now.

Zarith Stubs JS is a
reimplementation of the native C functions in JavaScript. It makes
extensive use of
peterolson/BigInteger.js
as a shim for browser BigInt functionality and also for the
implementations of many numerical algorithms.

How to use it ?

In order to use zarith with js_of_ocaml, just provide the
javascript runtime files to the js_of_ocaml compiler and use zarith
as you would normally do.

In practice,

• if you use dune to build your
  project, just add zarith_stubs_js as a library dependency.

• if you don't use dune, you need to find a way to pass both
  biginteger.js and runtime.js files to
  the js_of_ocaml compiler command line.