wasm-bindgen/guide/src/reference.md

Reference

The table below provides an overview of all the types that wasm-bindgen can send/receive across the wasm ABI boundary.

Type	T parameter	&T parameter	&mut T parameter	T return value
str	No	Yes	No	Yes
char	Yes	No	No	Yes
bool	Yes	No	No	Yes
JsValue	Yes	Yes	Yes	Yes
Box<[JsValue]>	Yes	No	No	Yes
*const T	Yes	No	No	Yes
*mut T	Yes	No	No	Yes
u8 i8 u16 i16 u64 i64 isize size	Yes	No	No	Yes
u32 i32 f32 f64	Yes	Yes	Yes	Yes
Box<[u8]> Box<[i8]> Box<[u16]> Box<[i16]> Box<[u32]> Box<[i32]> Box<[u64]> Box<[i64]>	Yes	No	No	Yes
Box<[f32]> Box<[f64]>	Yes	No	No	Yes
[u8] [i8] [u16] [i16] [u32] [i32] [u64] [i64]	No	Yes	Yes	No
&[u8] &mut[u8] &[i8] &mut[i8] &[u16] &mut[u16] &[i16] &mut[i16] &[u32] &mut[u32] &[i32] &mut[i32] &[u64] &mut[u64] &[i64] &mut[i64]	No	No	No	Yes
[f32] [f64]	No	Yes	Yes	No
&[f32] &mut[f32] &[f64] &mut[f64]	No	No	No	Yes