This is a very bare bones calculator made for the purposes of exploring Web Assembly. I don't think there is any viable reason for using it. So don't.
But if you want to...
npm install rust-calculator
Importing a web assembly module is a little different than normals JS modules. They must be imported asynchronously.
const wasm = import('rust-calculator');
wasm.then(calculator => {
calculator.calculate(4.0, 3.0, '*');
});
I believe you can get around the asynchronous syntax with some configuring in Webpack 4.
The operator must be a string, and one of +, -, /, *. Returns a number.