Component Model & WIT IDL

[mizchi]

I added component model support proposal.

It includes these proposals.

• moonc generates component-model definitions
• moonbit as wit guest
• moonbit as wit host
• wit file generation

It provides structured input/output with other languages.

Expected Usages

moonbit code

// lib.mbt
struct Point {
  x: Int
  y: Int
}
pub fn new_point(x: Int, y: Int) -> Point {
  Point::{x, y}
}

compile with jco (js host code generator)

$ moon build --target wasm-gc
$ npx jco transpile target/wasm-gc/release/build/mylib/mylib.wasm -o out

js host runner

const { new_point } = await import("./out/mylib.js");
console.log(new_point(3, 4)); // => {x: 3, y: 4}

[mizchi]

I found component model registry.

https://wa.dev/

If moonbit supports it, moonbit can use this ecosystem.