As of August 2025, work on Wasm and Wasm::Wasmtime has stalled, in the meantime. Checkout these modules which have more recent releases:
What follows is the original description of the project:
The goal of the Perl Wasm project is for Perl and WebAssembly to be able to call each other transparently without having to know or care which module is implemented ion which langauge. Using Wasm, Perl subroutines and WebAssembly functions can easily be imported and exported between both Perl and WebAssembly.
package MathStuff;
use strict;
use warnings;
use base qw( Exporter );
use Wasm
-api => 0,
-exporter => 'ok',
-wat => q{
(module
(func (export "add") (param i32 i32) (result i32)
local.get 0
local.get 1
i32.add)
(func (export "subtract") (param i32 i32) (result i32)
local.get 0
local.get 1
i32.sub)
(memory (export "frooble") 2 3)
)
};
1;
use MathStuff qw( add subtract ); print add(1,2), "\n"; # prints 3 print subtract(3,2), "\n", # prints 1
The current implementation uses wasmtime.dev. The API is structured on two levels. The module Wasm allows simply importing WebAssembly functions into your Perl code without having to know or care about the lowerlevel Wasm::Wasmtime. Wasm::Wasmtime in contrast provides a powerful low level interface for interacting with WebAssembly.