unplugin-inject-preload

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unplugin-inject-preload

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A plugin for injecting <link rel='preload'> for ViteJS, HTMLWebpackPlugin and HTMLRspackPlugin

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# unplugin-inject-preload

[![NPM Version](https://img.shields.io/npm/v/unplugin-inject-preload)](https://www.npmjs.com/package/unplugin-inject-preload) [![jsr](https://img.shields.io/endpoint?url=https%3A%2F%2Fjsr-api.sxzz.moe%2Fbadge%2F%40applelo%2Funplugin-inject-preload)](https://jsr.io/@applelo/unplugin-inject-preload) [![node-current](https://img.shields.io/node/v/unplugin-inject-preload)](https://nodejs.org/) [![Coverage Status](https://coveralls.io/repos/github/Applelo/unplugin-inject-preload/badge.svg?branch=main)](https://coveralls.io/github/Applelo/unplugin-inject-preload?branch=main)

This plugin adds preload links by getting output assets from the build tools you are using.

Supporting:
- Vite 4 and 5 **(on build only)**
- Webpack 5 (with [HtmlWebpackPlugin 5](https://github.com/jantimon/html-webpack-plugin))
- Rspack 1.0 (with [HtmlWebpackPlugin 5](https://github.com/jantimon/html-webpack-plugin) or [HtmlRspackPlugin](https://www.rspack.dev/config/plugins.html#htmlrspackplugin))

> [!NOTE]
> This plugin combines [vite-plugin-inject-preload](https://github.com/Applelo/vite-plugin-inject-preload) and [html-webpack-inject-preload](https://github.com/principalstudio/html-webpack-inject-preload) into one package.
>
> See the [migration guide](#migration) for `vite-plugin-inject-preload` and `html-webpack-inject-preload` .

## Install

```bash
#npm
npm i -D unplugin-inject-preload
#yarn
yarn add -D unplugin-inject-preload
#pnpm
pnpm i -D unplugin-inject-preload
```

```ts
// vite.config.ts
import UnpluginInjectPreload from 'unplugin-inject-preload/vite'

export default defineConfig({
  plugins: [
    UnpluginInjectPreload({ /* options */ }),
  ],
})
```

Example: [`playground/vitejs`](./playground/vitejs)

> The Vite plugin [only works on build](https://github.com/Applelo/vite-plugin-inject-preload/issues/15) because of the way Vite behave.

</details>

<details>
<summary>Webpack (with HtmlWebpackPlugin)</summary>

```ts
// webpack.config.js
const HtmlWebpackPlugin = require('html-webpack-plugin')
const UnpluginInjectPreload = require('unplugin-inject-preload/webpack')

module.exports = {
  plugins: [
    HtmlWebpackPlugin({ /*  HtmlWebpackPlugin options */ }),
    UnpluginInjectPreload({ /* options */ }),
  ]
}
```

Example: [`playground/webpack`](./playground/webpack)

</details>

<details>
<summary>Rspack (with HtmlWebpackPlugin)</summary>

```ts
// rspack.config.js
const HtmlWebpackPlugin = require('html-webpack-plugin')
const UnpluginInjectPreload = require('unplugin-inject-preload/rspack')

module.exports = {
  plugins: [
    HtmlWebpackPlugin({ /*  HtmlWebpackPlugin options */ }),
    UnpluginInjectPreload({ /* options */ }),
  ]
}
```

Example: [`playground/rspack`](./playground/rspack)

</details>

<details>
<summary>Rspack (with HtmlRspackPlugin)</summary>

```ts
// rspack.config.js
const HtmlWebpackPlugin = require('html-webpack-plugin')
const UnpluginInjectPreload = require('unplugin-inject-preload/rspack')

module.exports = {
  plugins: [
    new rspack.HtmlRspackPlugin({ /* HtmlRspackPlugin options */ }),
    UnpluginInjectPreload({ /* options */ }),
  ]
}
```

Example: [`playground/rspack`](./playground/rspack)

</details>

## 👨‍💻 Usage

> All example are presented for ViteJS but this is the same behavior for Webpack and RsPack

All the files needs to be process by the bundler to be find by the plugin. For example, if I load this CSS file :

```css
@font-face {
  font-family: 'Roboto';
  src: url('./../fonts/Roboto-Italic.woff2');
  font-weight: 400;
  font-style: italic;
}

@font-face {
  font-family: 'Roboto';
  src: url('./../fonts/Roboto-Regular.woff2');
  font-weight: 400;
  font-style: normal;
}
```

I can make the following configuration for UnpluginInjectPreload :

```js
// vite.config.js / vite.config.ts
import UnpluginInjectPreload from 'unplugin-inject-preload/vite'

export default {
  plugins: [
    UnpluginInjectPreload({
      files: [
        {
          entryMatch: /Roboto-[a-zA-Z]*\.woff2$/,
        },
        {
          outputMatch: /lazy.[a-z-0-9]*.(css|js)$/,
        }
      ]
    })
  ]
}
```

### Options

* files: An array of files object
  * entryMatch: A regular expression to target entry files you want to preload
  * outputMatch: A regular expression to target output build files you want to preload
  > You need to set at least `entryMatch` or/and `outputMatch`. Be aware that entry file is not always present for webpack and `entryMatch` will do nothing.

* attributes (optional):
 If this option is ommited, it will determine the `mime` and the `as` attributes automatically.
 You can also add/override any attributes you want.
* injectTo (optional): By default, the preload links are injected with the `'head-prepend'` options. But you can pass `'head'` to inject preload links at bottom of the head tag if you need it. You can pass the `'custom'` option and put `` in your `.html` file where you want to inject the preload links.

With the full options usage, you can do something like this :

```js
// vite.config.js / vite.config.ts
import UnpluginInjectPreload from 'unplugin-inject-preload/vite'

export default {
  plugins: [
    UnpluginInjectPreload({
      files: [
        {
          entryMatch: /Roboto-[a-zA-Z]*\.woff2$/,
          outputMatch: /Roboto-[a-zA-Z]*-[a-z-0-9]*\.woff2$/,
          attributes: {
            'type': 'font/woff2',
            'as': 'font',
            'crossorigin': 'anonymous',
            'data-font': 'Roboto'
          }
        },
        {
          outputMatch: /lazy.[a-z-0-9]*.(js)$/,
          attributes: {
            rel: 'modulepreload',
            type: undefined,
          }
        }
      ],
      injectTo: 'head-prepend'
    })
  ]
}
```

## Migration

### From vite-plugin-inject-preload

`package.json`

```diff
{
  "devDependencies": {
-   "vite-plugin-inject-preload": "*",
+   "unplugin-inject-preload": "^3.0.0",
  }
}
```

`vite.config.js`

```diff
- import VitePluginInjectPreload from 'vite-plugin-inject-preload'
+ import UnpluginInjectPreload from 'unplugin-inject-preload/vite'

export default {
  plugins: [
-   VitePluginInjectPreload({
+   UnpluginInjectPreload({
      files: [
        {
-         match: /Roboto-[a-zA-Z]*-[a-z-0-9]*\.woff2$/,
+         outputMatch: /Roboto-[a-zA-Z]*-[a-z-0-9]*\.woff2$/,
          attributes: {
            'type': 'font/woff2',
            'as': 'font',
            'crossorigin': 'anonymous',
            'data-font': 'Roboto'
          }
        },
      ],
      injectTo: 'head-prepend'
    })
  ]
}
```

### From html-webpack-inject-preload

`package.json`

```diff
{
  "devDependencies": {
-   "@principalstudio/html-webpack-inject-preload": "*",
+   "unplugin-inject-preload": "^3.0.0",
  }
}
```

```diff
const HtmlWebpackPlugin = require('html-webpack-plugin');
- const HtmlWebpackInjectPreload = require('@principalstudio/html-webpack-inject-preload');
+ const UnpluginInjectPreload = require('unplugin-inject-preload/webpack');

module.exports = {
  entry: 'index.js',
  output: {
    path: __dirname + '/dist',
    filename: 'index_bundle.js'
  },
  plugins: [
    new HtmlWebpackPlugin(),
-   new HtmlWebpackInjectPreload({
+   UnpluginInjectPreload({
      files: [
        {
-         match: /.*\.woff2$/,
+         outputMatch: /.*\.woff2$/,
          attributes: {
            as: 'font',
            type: 'font/woff2', crossorigin: true
          },
        },
      ]
    })
  ]
}
```

## 👨‍💼 Licence

MIT

unplugin-inject-preload

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