Javascript Webpack使用Emscripten抛出错误：Can'；t解决'；财政司司长'；

将javascript文件导入vue.js组件时遇到错误：

这是/components子文件夹的内容：

/startingV/src/components$ ls -lah
total 132K
drwxr-xr-x 2 marco marco 4,0K dic 26 11:22 .
drwxr-xr-x 5 marco marco 4,0K dic 26 09:32 ..
-rw-r--r-- 1 marco marco  441 nov  2  2016 Counter.vue
-rw-r--r-- 1 marco marco  441 dic 21 15:13 FormValidation.vue
-rw-r--r-- 1 marco marco 100K dic 26 10:38 js_plumbing.js
-rw-r--r-- 1 marco marco 9,3K dic 26 10:38 js_plumbing.wasm
-rw-r--r-- 1 marco marco  473 dic 26 11:14 Result.vue

在编译时：

Failed to compile.

./src/components/js_plumbing.js
Module not found: Error: Can't resolve 'fs' in '/home/marco/cpp/WebAssemblyinAction
/Appendix_B/B.1_ccall/startingV/src/components'

这是Result.vue文件：

template>
    <p button @click="callAdd">Add!</p>
</template>

<script>
    import * as js_plumbing from './js_plumbing'
    export default {
      data () {
        return {
          result: null
        }
      },
      methods: {
        callAdd() {
          const result = Module.ccall('js_plumbing.Add',
              'number',
              ['number', 'number'],
              [1, 2]);
          console.log('Result: ${result}');
        }
      }
    }
</script>

其中，add.c是：

#include <stdlib.h>
#include <emscripten.h>

// If this is an Emscripten (WebAssembly) build then...
#ifdef __EMSCRIPTEN__
  #include <emscripten.h>
#endif

#ifdef __cplusplus
extern "C" { // So that the C++ compiler does not rename our function names
#endif

EMSCRIPTEN_KEEPALIVE
int Add(int value1, int value2) 
{
  return (value1 + value2); 
}

#ifdef __cplusplus
}
#endif

如何解决？ 马可

TLDR； 有两种解决方案：

在您的emcc命令中添加

-s ENVIRONMENT='web'

，因此请尝试

emcc Add.c-o js_peoping.js-s EXTRA_EXPORTED_RUNTIME_方法=['ccall'，'cwrap']-s ENVIRONMENT='web'

或

在

webpack.config.js

中添加

“节点”：{“fs”：“empty”}

字段。但我不知道如何以零配置的方式完成

为什么？ Emscripten的emcc命令同时生成

.js

和

.wasm

文件。

.js

文件不仅是

.wasm

的包装器，而且还为web提供了C/C++运行时，更重要的是，它是

.wasm

文件的通用加载程序

.js

文件的加载器非常全面，默认情况下包括节点、web、web工作者和。这通常会给Webpack之类的绑定器带来问题，因为绑定器尝试解析源代码中的所有模块，包括用于在nodejs环境中加载

.wasm

文件的

require（'fs'）

，如果任何模块不适用于web环境，则绑定器会产生错误

避免该问题的一种方法是在

emcc

命令中使用标志。这将删除一些有问题的代码，例如

require（'fs'）

---

另一种方法是让网页包忽略

fs

模块，方法是在网页包配置中添加

“节点”：{“fs”：“empty”}

。

js\u piping.js文件中有什么？Hi@Piyush！我用js_pipeoping.js文件的内容更新了我的问题，你用什么来编译返回错误？@bumsikim我用这个命令编译了add.c文件：emcc add.c-o js_pipeoping.js-s EXTRA_EXPORTED_RUNTIME_METHODS=['ccall'，'cwrap']哦，我问的第一个编译命令抱怨没有'fs'模块，不是emcc命令。我猜emcc命令不会出错，对吧？我尝试了两种方法：在webpack.config.js中使用ENVIRONMENT='web'和module.exports={node:{'fs'：'empty'}，效果很好。非常感谢您对webpack 5的出色解释resolve.fallback.fs:false

#include <stdlib.h>
#include <emscripten.h>

// If this is an Emscripten (WebAssembly) build then...
#ifdef __EMSCRIPTEN__
  #include <emscripten.h>
#endif

#ifdef __cplusplus
extern "C" { // So that the C++ compiler does not rename our function names
#endif

EMSCRIPTEN_KEEPALIVE
int Add(int value1, int value2) 
{
  return (value1 + value2); 
}

#ifdef __cplusplus
}
#endif

(base) marco@marco-U36SG:~/cpp/WebAssemblyinAction/Appendix_B 
/B.1_ccall/startingV$ npm run dev

> myproject@1.0.0 dev /home/marco/cpp/WebAssemblyinAction/Appendix_B 
/B.1_ccall/startingV
> cross-env NODE_ENV=development webpack-dev-server --open --hot

✖ ｢wdm｣: Hash: 12bee4de7abfde1cbc5d
Version: webpack 4.41.3
Time: 6707ms
Built at: 12/26/2019 12:37:07 PM
   Asset      Size  Chunks                    Chunk Names
build.js  2.18 MiB    main  [emitted]  [big]  main
Entrypoint main [big] = build.js
[0] multi (webpack)-dev-server/client?http://localhost:8080   
(webpack)/hot/dev-server.js ./src/main.js 52 bytes {main} [built]
[./node_modules/strip-ansi/index.js] 161 bytes {main} [built]
[./node_modules/vue/dist/vue.esm.js] 319 KiB {main} [built]
[./node_modules/webpack-dev-server/client/index.js?http:
//localhost:8080] (webpack)-dev-server/client?http://localhost:8080  
4.29 KiB {main} [built]
[./node_modules/webpack-dev-server/client/overlay.js] (webpack)-dev-
server/client/overlay.js 3.51 KiB {main} [built]
[./node_modules/webpack-dev-server/client/socket.js] (webpack)-dev-
server/client/socket.js 1.53 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/createSocketUrl.js]   
(webpack)-dev-server/client/utils/createSocketUrl.js 2.89 KiB {main} 
[built]
[./node_modules/webpack-dev-server/client/utils/log.js] (webpack)-dev-
server/client/utils/log.js 964 bytes {main} [built]
[./node_modules/webpack-dev-server/client/utils/reloadApp.js] 
(webpack)-dev-server/client/utils/reloadApp.js 1.59 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/sendMessage.js] 
(webpack)-dev-server/client/utils/sendMessage.js 402 bytes {main}   
[built]
[./node_modules/webpack/hot sync ^\.\/log$] (webpack)/hot sync 
nonrecursive ^\.\/log$ 170 bytes {main} [built]
[./node_modules/webpack/hot/dev-server.js] (webpack)/hot/dev-server.js
 1.59 KiB {main} [built]
[./node_modules/webpack/hot/emitter.js] (webpack)/hot/emitter.js 75 
bytes {main} [built]
[./node_modules/webpack/hot/log-apply-result.js] (webpack)/hot/log-
apply-result.js 1.27 KiB {main} [built]
[./src/main.js] 134 bytes {main} [built]
    + 34 hidden modules

ERROR in ./src/components/js_plumbing.js
Module not found: Error: Can't resolve 'fs' in '/home/marco 
/cpp/WebAssemblyinAction/Appendix_B/B.1_ccall/startingV
/src/components'
 @ ./src/components/js_plumbing.js 88:26-39
 @ ./node_modules/babel-loader/lib!./node_modules/vue-loader
/lib/selector.js?type=script&index=0!./src/components/Result.vue
 @ ./src/components/Result.vue
 @ ./node_modules/babel-loader/lib!./node_modules/vue-loader
/lib/selector.js?type=script&index=0!./src/App.vue
 @ ./src/App.vue
 @ ./src/main.js