Fails to compile, when I try to use include with EJS files. (Error: Child compilation failed.)

Question

我已经将其设为 github 问题，但我怀疑可能存在一些我不知道的琐碎问题。

非常感谢您提供一些帮助我进行调试的意见。

演示：

https://github.com/andrasna/html-ejs-webpack-config-issue-demo

index.ejs

<% const title = 'Hello' %>

<%- include('partial') -%>

<h1><%= `${title} World` %></h1> 

webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: 'index.ejs',
    })
  ]
}

预期行为

我正在尝试根据文档将一个 EJS 文件包含到另一个文件中：

https://ejs.co/#docs

<%- include('header'); -%>
<h1>
  Title
</h1>
<p>
  My page
</p>
<%- include('footer'); -%>

我希望 partial.ejs 中的 HTML 包含在 index.ejs 文件中。

当前行为

我得到 "Error: Child compilation failed"（请参阅下面的完整错误消息）。

但是，如果我在 index.ejs 中删除带有 include 的行，EJS 会被编译。这就是为什么我认为问题是特定于包含的。

有什么想法吗？

错误信息

> npm start

> html-ejs-webpack-config-issue-demo@1.0.0 start /Users/user/Dev/html-ejs-webpack-config--issue-demo
> webpack-dev-server --mode development

ℹ ｢wds｣: Project is running at http://localhost:8080/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: Content not from webpack is served from /Users/user/Dev/html-ejs-webpack-config--issue-demo
✖ ｢wdm｣: Hash: f9f8666f87ab7acd22cd
Version: webpack 4.41.2
Time: 595ms
Built at: 19/10/2019 15:34:18
     Asset      Size  Chunks             Chunk Names
index.html  1.72 KiB          [emitted]  
   main.js   360 KiB    main  [emitted]  main
Entrypoint main = main.js
[0] multi (webpack)-dev-server/client?http://localhost:8080 ./src 40 bytes {main} [built]
[./node_modules/ansi-html/index.js] 4.16 KiB {main} [built]
[./node_modules/ansi-regex/index.js] 135 bytes {main} [built]
[./node_modules/html-entities/index.js] 231 bytes {main} [built]
[./node_modules/loglevel/lib/loglevel.js] 7.68 KiB {main} [built]
[./node_modules/strip-ansi/index.js] 161 bytes {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]
[./src/index.js] 0 bytes {main} [built]
    + 18 hidden modules

ERROR in   Error: Child compilation failed:
  Module build failed (from ./node_modules/html-webpack-plugin/lib/loader.js):
  SyntaxError: Unexpected token )

  - Function

  - lodash.js:14870 
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:14870:16

  - lodash.js:473 apply
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:473:27

  - lodash.js:15254 
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:15254:16

  - lodash.js:475 apply
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:475:27

  - lodash.js:6563 
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:6563:16

  - lodash.js:14869 Function.template
    [html-ejs-webpack-config--issue-demo]/[lodash]/lodash.js:14869:20


  - SyntaxError: Unexpected token )

  - compiler.js:79 childCompiler.runAsChild
    [html-ejs-webpack-config--issue-demo]/[html-webpack-plugin]/lib/compiler.js:79:16

  - Compiler.js:343 compile
    [html-ejs-webpack-config--issue-demo]/[webpack]/lib/Compiler.js:343:11

  - Compiler.js:681 hooks.afterCompile.callAsync.err
    [html-ejs-webpack-config--issue-demo]/[webpack]/lib/Compiler.js:681:15


  - Hook.js:154 AsyncSeriesHook.lazyCompileHook
    [html-ejs-webpack-config--issue-demo]/[tapable]/lib/Hook.js:154:20

  - Compiler.js:678 compilation.seal.err
    [html-ejs-webpack-config--issue-demo]/[webpack]/lib/Compiler.js:678:31


  - Hook.js:154 AsyncSeriesHook.lazyCompileHook
    [html-ejs-webpack-config--issue-demo]/[tapable]/lib/Hook.js:154:20

  - Compilation.js:1423 hooks.optimizeAssets.callAsync.err
    [html-ejs-webpack-config--issue-demo]/[webpack]/lib/Compilation.js:1423:35



Child html-webpack-plugin for "index.html":
     1 asset
    Entrypoint undefined = index.html
    [./node_modules/html-webpack-plugin/lib/loader.js!./index.ejs] 922 bytes {0} [built] [failed] [1 error]

    ERROR in ./index.ejs (./node_modules/html-webpack-plugin/lib/loader.js!./index.ejs)
    Module build failed (from ./node_modules/html-webpack-plugin/lib/loader.js):
    SyntaxError: Unexpected token )
        at Function (<anonymous>)
        at /Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:14870:16
        at apply (/Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:473:27)
        at /Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:15254:16
        at apply (/Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:475:27)
        at /Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:6563:16
        at Function.template (/Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/lodash/lodash.js:14869:20)
        at Object.module.exports (/Users/user/Dev/html-ejs-webpack-config--issue-demo/node_modules/html-webpack-plugin/lib/loader.js:28:22)
ℹ ｢wdm｣: Failed to compile.

Answer 1

将 ejs-compiled-loader 与 HtmlWebpackPlugin

结合使用

npm install --save-dev ejs-compiled-loader

将webpack.config.js更改为：

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: '!!ejs-compiled-loader!index.ejs', //Here is the Loader plugged in
    })
  ]
}

(as described here)

然后将您的模板更改为有效的 EJS。 HtmlWebpackPlugin 说："By default (if you don't specify any loader in any way) a fallback lodash loader kicks in." 它使用 lodash 呈现模板作为一个简约的加载器。这就是为什么您的错误来自 lodash.js .

index.ejs:

<% title = 'Hello' %>

<%- include partial -%>

<h1><%= title%> World</h1> 

然后 npm start 和您新编译的 "Lorem Ipsum ...Hello World" 将在您的本地主机上提供。

或 npx webpack --mode=development 让您的 'dist/index.html' 享受源代码:)

Answer 2

您的用例存在问题，您的 webpack 文件没有使用 ejs 编译器。

我进行了一些更改并重构了您的一些不良做法。

您可以在下面找到最终代码：

https://gitlab.com/akhileshcoder/ejs-webpack-starter

现在您的 webpack.config 如下所示（作为客户端的 task/project 处理程序）

module.exports = {
  devServer: {
    inline:true,
    port: 8080
  },
  entry: './src/index.js',
  output: {
    path: __dirname + '/public/dist',
    filename: 'bundle.js',
    publicPath: '/public/dist',
    library: 'bundle',
    libraryTarget: 'var'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['es2015']
            }
          }
        ]
      }
    ]
  }
};

并且 ejb 在 express 上得到渲染如下：

app.set('views', path.join(__dirname, '../views'));
app.set('view engine', 'ejs');
app.get('/', function(req, res, next) {
  res.render('index', {title: 'Hello World'});
});