如何使用 nunjucks 文件作为 webpack 的入口点?

How do I use a nunjucks file as an entry point with webpack?

我和 ejs 一起看过这个 post。但是如何使用 webpack 实现同样的效果?

我尝试将 nunjucks-loader 与 html-webpack-plugin 结合使用,但出现以下错误:[nunjucks-loader] non-web targets are not supported.

这是我的代码:

配置如下:

const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
  //template: './client/index.html',
  filename: 'index.html',
  inject: 'body',
  template: 'nunjucks-html-loader!./client/templates/index.njk',
});

module: {
    loaders: [
      {
        test: /\.html$/,
        use: ['html-loader']
      }, 
      {
        test: /\.|njk|nunjucks$/,
        use: ['nunjucks-loader']
      }]
  };

这可能很长,但请耐心等待:

问题是 nunjucks-loader 将其作为 JavaScript 文件 (According to the first paragraph) 传递。

而是使用 nunjucks-html-loader

使用 npm 或 yarn 安装它: 首先,我们安装nunjucks-html-loader:

npm i nunjucks-html-loader -D

yarn add nunjucks-html-loader -D

我还建议安装(这是可选的)webpack-glob-folder-entries(更多信息)

npm i webpack-glob-folder-entries -D

yarn add webpack-glob-folder-entries -D

然后,如果我们考虑我们有以下文件夹结构:

- client/
     -templates/
          -index.njk   
          -layout.njk
          -_partials/
- webpack.config.js

在 index.njk 里面,我们有这样的东西:

<!-- index.nunjucks -->
{% extends "layout.njk" %}
{% block content %}
   <h1> Here comes my content that is injected to layout.njk!</h1>
{% endblock %}

我们可以直接配置webpack,设置如下:

//#1: Define the HTML Webpack Plugin:
const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
    filename: 'index.html',
    inject: 'body',

// Here is part of the magic, we get the index.njk but we tell
// webpack to pass it through the nunjucks-html-loader
    template: 'nunjucks-html-loader!./client/templates/index.njk',
  });

// Optional, but highly recommended. Create a returnEntries:
// Webpack doesn't support glob paths. For the nunjucks-html-loader
// we need each path to be specified for it to work (YES, even subdirectories!)

function returnEntries(globPath){
  let entries = glob_entries(globPath, true);
  let folderList = new Array();
  for (let folder in entries){
     folderList.push(path.join(__dirname, entries[folder]));
  }
  return folderList;
}

module.exports = {
// You should not have this the same. This is from my site. Go down to see the important part:
    entry: './client/index.js',
    output: {
      filename: production ? '[name]-[hash].js' : 'bundle.js',
      path: __dirname + '/dist',
      publicPath: 'dist/' //Important!!! : https://github.com/webpack/webpack/issues/1426
    },
   // #2  We load the HTMLWebpackPluginConfig
    plugins: [
      HtmlWebpackPluginConfig,
      extractTextPlugin
    ],

    resolve: {
      extensions: ['.Webpack.js', '.web.js', '.ts', '.js', '.tsx']
    },

// HERE is the important part
    module: {
      loaders: [
        {
          // HTML LOADER
          // Super important: We need to test for the html 
          // as well as the nunjucks files
          test: /\.html$|njk|nunjucks/,
          use: ['html-loader',{
            loader: 'nunjucks-html-loader',
            options : {
               // Other super important. This will be the base
               // directory in which webpack is going to find 
               // the layout and any other file index.njk is calling.
               searchPaths: [...returnEntries('./client/templates/**/')]
               // Use the one below if you want to use a single path.
               // searchPaths: ['./client/templates'],
            }
          }]
        }
        ]
    }
}

然后 运行 webpack,就可以了。

注:

searchPaths: ['./client/templates'],

很重要。这是 Webpack 将用来查找 index.njk 正在调用的任何文件的基本路径。尝试稍微弄乱路径以了解其工作原理。但是不要删除它。

此外,webpack 支持 glob 目录。我使用 webpack-glob-folder-entries 编写了一个辅助函数,它为我提供了 nunjucks-html-loader 可以查看的所有子文件夹的列表。请理解,如果您不指定文件夹(即使它是一个子目录),它将工作。

换句话说,如果你想使用_partials 文件夹(如上),而你没有将它指定为'./client/templates/_partials',加载器将不会拾取它!

此外,

 test: /\.html$|njk|nunjucks/,

不用于 index.njk,但 用于 index.njk 调用的文件 ,在本例中为 layout.njk。未能包含 njk 或 nunjucks 扩展将不会加载 layout.njk 并且会给您一个错误。

我在寻找解决方案时也遇到了这个问题,公认的解决方案对我不起作用,所以我发现将我的解决方案添加到混合中是合适的,关于如何使用 nunjucks 作为 web-pack 中的条目.

我一直 运行 解决具有多个入口点的问题,直到最后我找到了以下 repo 并解决了这个问题。

使用Nunjucks-Isomorphic-Loader

在撰写本文时请注意,npm 注册表尚未更新最近的代码更改,因此您需要 link 直接从您 package.json 到 repo

这是我的:proof of concept repository

下面是我写的webpack配置供参考:

const webpack = require('webpack');
const path = require('path');
const fs = require('fs');
const HtmlWebpackPlugin = require('html-webpack-plugin')

// Notice, the below methods searches src/components and adds a HtmlWebpackPlugin for each folder
// This is required, even for subfolders otherwise you nunjuck includes will nto work.
const d = './src/components';
const entryFolders = fs.readdirSync(path.resolve(d))
   .map(f => path.join(__dirname, path.join(d, f))  )
   .filter(f => fs.statSync(f).isDirectory());

function getHtmlComponentPlugins() {
 return entryFolders.map(templatePath => {
  const name = templatePath.split('\').pop()

  const sett = {
      customData: { foo: 'bar' },
      filename: path.relative(__dirname, templatePath.replace('src\', '') + `\${name}.html`),
      template: templatePath + `\${name}.njk`
    };

  return new HtmlWebpackPlugin(sett)
 });
}

module.exports = function() {
 return {
  devtool: '#source-map',
  mode: 'development',
  entry: [
   './src/index.js'
  ],
  output: {
   path: path.resolve(__dirname, 'dist')
  },
     resolve: {
       extensions: [ '.js' ]
     },
  module: {
      rules : [
    {
       test: /\.(njk|nunjucks|html|tpl|tmpl)$/,
       use: [
         {
          loader: 'nunjucks-isomorphic-loader',
            query: {
             root: [
              path.resolve(__dirname, 'src'),
              
             ].concat(entryFolders)
           }
        }
      ]
    }
      ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      customData: { foo: 'bar' },
      filename: 'index.html',
      template: 'src/index.njk'
    })
  ].concat(getHtmlComponentPlugins())
 };
}

与其混合使用加载程序 (nunjucks-loader) 和 Webpack 插件 (HtmlWebpackPlugin),不如尝试 nunjucks-webpack-plugin

它看起来是 HtmlWebpackPlugin 的一个很好的替代品!