@chialab/esbuild-plugin-html

Esbuild Plugin HTML • A HTML loader plugin for esbuild.

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How it works

Esbuild Plugin HTML instructs esbuild to load a HTML file as entrypoint. It parses the HTML and runs esbuild on scripts, styles, assets and icons.

Scripts

It handles both inline and file scripts. When the type="module" attribute is found in the <script> tag, it runs esbuild with format: 'esm', otherwise it will produce an iife bundle.

Sample

<script src="src/index.js" type="module"></script>
<script src="src/index.js" nomodule></script>

This will result in producing two bundles:

<script src="index-[hash].js" type="module"></script>
<script src="index-[hash].js" nomodule></script>

Styles

It supports both <link rel="stylesheet"> and <style> nodes for styling.

Sample

<link rel="stylesheet" href="app.css" />
<style>
    .inline {
        color: red;
    }
</style>

This will result in producing two css bundles:

<link rel="stylesheet" href="css/app-[hash].css" />
<style>@import url('css/inline-[hash].css');</style>

Assets

Referenced files by src and href attributes are copy along the html file in the assets directory.

Sample

<img src="img/logo.png" />

This will result in:

<img src="assets/logo-[hash].png" />

Icons

Manually generate favicons can be a pain. This plugin detects a <link rel="icon"> node and uses its reference to generate icons and launch screens for (almost) every browser.

Sample

<link rel="shortcut icon" href="icon.png" type="image/png">

This will result in:

<link rel="icon" sizes="16x16" href="icons/favicon-16x16.png">
<link rel="icon" sizes="32x32" href="icons/favicon-32x32.png">
<link rel="icon" sizes="48x48" href="icons/favicon-48x48.png">
<link rel="shortcut icon" href="icons/favicon-196x196.png">
<link rel="icon" sizes="196x196" href="icons/favicon-196x196.png">
<link rel="apple-touch-icon" sizes="180x180" href="icons/apple-touch-icon.png">
<link rel="apple-touch-icon" sizes="167x167" href="icons/apple-touch-icon-ipad.png">
<link rel="apple-touch-startup-image" media="(device-width: 375px) and (device-height: 812px) and (-webkit-device-pixel-ratio: 3)" href="icons/apple-launch-iphonex.png">
<link rel="apple-touch-startup-image" media="(device-width: 375px) and (device-height: 667px) and (-webkit-device-pixel-ratio: 2)" href="icons/apple-launch-iphone8.png">
<link rel="apple-touch-startup-image" media="(device-width: 414px) and (device-height: 736px) and (-webkit-device-pixel-ratio: 3)" href="icons/apple-launch-iphone8-plus.png">
<link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" href="icons/apple-launch-iphone5.png">
<link rel="apple-touch-startup-image" media="(device-width: 768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2)" href="icons/apple-launch-ipadair.png">
<link rel="apple-touch-startup-image" media="(device-width: 834px) and (device-height: 1112px) and (-webkit-device-pixel-ratio: 2)" href="icons/apple-launch-ipadpro10.png">
<link rel="apple-touch-startup-image" media="(device-width: 1024px) and (device-height: 1366px) and (-webkit-device-pixel-ratio: 2)" href="icons/apple-launch-ipadpro12.png">

It also update <link rel="manifest"> content if found.

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Install

$ npm i @chialab/esbuild-plugin-html -D
$ yarn add @chialab/esbuild-plugin-html -D

Usage

Build artifacts will respect your esbuild configuration. Since the plugin treats HTML files as entrypoints, the resulting documents will use the pattern provided by entryNames, while JavaScript and CSS files will be written using the chunkNames config. Other files use the assetNames option.

This is a common esbuild configuration with the html plugin:

import esbuild from 'esbuild';
import htmlPlugin from '@chialab/esbuild-plugin-html';

await esbuild.build({
    entryPoints: ['src/index.html'],
    outdir: 'public',
    assetNames: 'assets/[name]-[hash]',
    chunkNames: '[ext]/[name]-[hash]',
    plugins: [
        htmlPlugin({
            // scriptsTarget: 'es6',
            // modulesTarget: 'es2020',
        }),
    ],
});

The output structure would be something similar to:

public
├── index.html
├── assets/favicon.png
├── css/style-YYYYY.css
├── css/style-YYYYY.css.map
├── js/index-YYYYY.js
└── js/index-YYYYY.js.map

Options

The HTML plugin accepts an options object with the following properties:

scriptsTarget

The target of the plain scripts build (type="text/javascript").

modulesTarget

The target of the ES modules build (type="module").

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License

Esbuild Plugin HTML is released under the MIT license.