wit-bindgen-cli 0.57.0

CLI tool to generate bindings for WIT documents and the component model. 
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package test:variants;

interface to-test {
  roundtrip-option: func(a: option<f32>) -> option<u8>;
  roundtrip-result: func(a: result<u32, f32>) -> result<f64, u8>;

  enum e1 { a, b }
  roundtrip-enum: func(a: e1) -> e1;

  invert-bool: func(a: bool) -> bool;

  variant c1 { a(s32), b(s64) }
  variant c2 { a(s32), b(f32) }
  variant c3 { a(s32), b(f64) }
  variant c4 { a(s64), b(f32) }
  variant c5 { a(s64), b(f64) }
  variant c6 { a(f32), b(f64) }
  type casts = tuple<c1, c2, c3, c4, c5, c6>;
  variant-casts: func(a: casts) -> casts;

  variant z1 { a(s32), b }
  variant z2 { a(s64), b }
  variant z3 { a(f32), b }
  variant z4 { a(f64), b }
  type zeros = tuple<z1, z2, z3, z4>;
  variant-zeros: func(a: zeros) -> zeros;

  type option-typedef = option<u32>;
  type bool-typedef = bool;
  type result-typedef = result<u32>;
  variant-typedefs: func(a: option-typedef, b: bool-typedef, c: result-typedef);

  enum my-errno { success, a, b }
  variant-enums: func(a: bool, b: result, c: my-errno) -> tuple<bool, result, my-errno>;
}

world runner {
  import to-test;

  export run: func();
}

world test {
  export to-test;
}