How to build WASM from Rust?

Following MDN's WASM tutorial I've built a wasm that runs in the browser.

Importing the generated

wasm.js

wasm.js

wasm.js

wasm.js works fine, when I try to import the

wasm_bg.wasm

wasm_bg.wasm

wasm_bg.wasm

wasm_bg.wasm directly, it throws this error.

Uncaught TypeError: Relative import path "__wbindgen_placeholder__" not prefixed with / or ./ or ../
    at async <anonymous>:1:51

Uncaught TypeError: Relative import path "__wbindgen_placeholder__" not prefixed with / or ./ or ../
    at async <anonymous>:1:51

Uncaught TypeError: Relative import path "__wbindgen_placeholder__" not prefixed with / or ./ or ../
    at async <anonymous>:1:51

Uncaught TypeError: Relative import path "__wbindgen_placeholder__" not prefixed with / or ./ or ../
    at async <anonymous>:1:51

Not really understanding how bindgen works, but how do I build a Deno compatible WASM from Rust