未为 `HashMap<i32, i32> 实现特性 `IntoWasmAbi`

问题描述

尝试将以下 rust 代码编译为 wasm 以使其与现有 js 兼容运行。试图从函数返回哈希映射值。

lib.rs

    use wasm_bindgen::prelude::*;
    use std::collections::HashMap;

   #[wasm_bindgen]
    pub fn get_transformed_filters()-> HashMap<i32,i32> { 
        let mut hm = HashMap::new();
        for i in 1..9990000 {
            hm.insert(i + i,i * i);
        }  
        return hm 
    }

运行命令 wasm-pack build 后控制台错误

[INFO]: ?  Checking for the Wasm target...
[INFO]: ?  Compiling to Wasm...
   Compiling hello-wasm v0.1.0 (/Users/mfe/ui/rustService/test-wasm)
error[E0277]: the trait bound `HashMap<i32,i32>: IntoWasmAbi` is not satisfied
  --> src/lib.rs:15:1
   |
15 | #[wasm_bindgen]
   | ^^^^^^^^^^^^^^^ the trait `IntoWasmAbi` is not implemented for `HashMap<i32,i32>`
   |
   = note: required because of the requirements on the impl of `ReturnWasmAbi` for `HashMap<i32,i32>`
   = note: this error originates in an attribute macro (in Nightly builds,run with -Z macro-backtrace for more info)

error: aborting due to prevIoUs error

For more information about this error,try `rustc --explain E0277`.
error: Could not compile `test-wasm`

To learn more,run the command again with --verbose.
Error: Compiling your crate to WebAssembly Failed
Caused by: Failed to execute `cargo build`: exited with exit code: 101
  full command: "cargo" "build" "--lib" "--release" "--target" "wasm32-unkNown-unkNown"

有什么办法可以实现吗？

解决方法

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