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webpack.config.js
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webpack.config.js
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const assert = require("assert");
const path = require("path");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const mode = process.env.NODE_ENV || "development";
class PreloadPlugin {
insertLinks(html, compilation) {
const links = [];
Object.keys(compilation.assets).forEach((asset) => {
if (/\.(png|gif|jpe?g|svg)/.test(asset)) {
links.push(`<link rel="preload" as="image" href="${asset}"/>`);
}
});
if (html.includes("</head>")) {
// If a valid closing </head> is found, insert the new <link>s right before it.
return html.replace("</head>", links.join("") + "</head>");
}
if (html.includes("<body>")) {
// If there's a <body> but no <head>, create a <head> containing the <head>.
return html.replace("<body>", `<head>${links.join("")}\n</head><body>`);
}
throw new Error(`The HTML provided did not contain a </head> or a <body>`);
}
apply(compiler) {
compiler.hooks.compilation.tap(this.constructor.name, (compilation) => {
const [HtmlWebpackPlugin] = compiler.options.plugins.filter(
(plugin) => plugin.constructor.name === "HtmlWebpackPlugin"
);
assert(HtmlWebpackPlugin, "Unable to find an instance of HtmlWebpackPlugin in the current compilation.");
const hook = HtmlWebpackPlugin.constructor.getHooks(compilation).beforeEmit;
hook.tapAsync(this.constructor.name, (htmlPluginData, callback) => {
try {
htmlPluginData.html = this.insertLinks(htmlPluginData.html, compilation);
callback(null, htmlPluginData);
} catch (error) {
callback(error);
}
});
});
}
}
module.exports = {
mode: mode,
entry: "./src/js/index.js",
output: {
clean: true,
filename: "assets/js/bundle.min.js",
},
plugins: [
new MiniCssExtractPlugin({
filename: "assets/css/bundle.min.css",
}),
new HtmlWebpackPlugin({
template: "./src/index.html",
hash: true,
favicon: "./src/img/favicon.ico",
}),
new PreloadPlugin(),
],
module: {
rules: [
{
test: /\.(png|gif|ico|jpe?g|svg)$/,
type: "asset/resource",
generator: {
filename: "assets/img/[name][ext]?[hash]",
},
},
{
test: /\.(woff2?|ttf|eot)$/,
type: "asset/resource",
generator: {
filename: "assets/fonts/[name][ext]?[hash]",
},
},
{
test: /\.(s[ac]|c)ss$/i,
use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
},
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: "babel-loader",
},
},
],
},
devServer: {
static: {
directory: path.join(__dirname, "dist"),
},
port: 3000,
},
stats: "errors-only",
};