# 一.loader

# 安装

package.json

{
  "devDependencies": {
    "webpack": "^4.29.6",
    "webpack-cli": "^3.3.0"
  }
}

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# 文件

src/index.js

console.log("loader")

loaders/loader1.js

function loader(source) {
  return source
}
module.exports = loader

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# 配置

webpack.config.js

let path = require("path")
module.exports = {
  mode: "development",
  entry: "./src/index.js",
  output: {
    filename: "build.js",
    path: path.resolve(__dirname, "dist"),
  },
  resolveLoader: {
    modules: ["node_modules", path.resolve(__dirname, "loaders")],
    // //别名
    // alias: {
    //   loader1: path.resolve(__dirname, "loaders", "loader1.js")
    // }
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: "loader1",
      },
    ],
  },
}

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# 打包

npx webpack

完整代码 (opens new window)

← 常见的 loader 二.deploy →