Hit Multiple snags following rust-wasm tutorial. Hoping for some help

[Rennzie]

Hi, I'm hoping someone could help me out. I've been working through the RustWasm book wasm-game-of-life tutorial but hit a snag.

When I compile Rust to wasm and import it into Javascript the struct turns into a class fine but I cannot invoke any of its methods. The console shows a Universe.new is not a function error - which is weird because the generated .d.ts file includes the method. If I invoke the class with new Universe() I get another error: Error: null pointer passed to rust. Finally I tried adding a #[wasm_bindgen(constructor)] macro to the Universe.new() struct impl which resulted in wasm-pack build throwing yet another error Caused by: failed to execute wasm-bindgen: exited with exit status: 101.

I've googled all these errors and can't find a way to move forward. It'd love if someone could take a look at my code (https://github.com/Rennzie/wasm-game-of-life) and help me out?

I've upgrade to the latest edition of rust (2021) and all my packages in cargo.toml are at latest:

[package]
name = "wasm-game-of-life"
version = "0.1.0"
authors = ["Sean.Rennie <rnnsea001@gmail.com>"]
edition = "2021"

[lib]
crate-type = ["cdylib", "rlib"]

[features]
default = ["console_error_panic_hook"]

[dependencies]
wasm-bindgen = "0.2.79"


[dev-dependencies]
wasm-bindgen-test = "0.3.29"

[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"