webpack-dynamic-public-path/README.md

Webpack dynamic public path plugin.

# Dynamic Public Path Plugin

Replace publicPath inside a chunk, or chunks, to a variable.

[![NPM](https://nodei.co/npm/webpack-dynamic-public-path.png?downloads=true&downloadRank=true&stars=true)](https://nodei.co/npm/webpack-dynamic-public-path/)

## Usage

> :warning: This plugin is compatible only with webpack 4. If you use webpack 5 - check official guide https://webpack.js.org/guides/public-path/#automatic-publicpath

**webpack.config.js**
```js
const WebpackDynamicPublicPathPlugin = require("webpack-dynamic-public-path");

module.exports = {
    output: {
        publicPath: "publicPathPlaceholder",
    },
    plugins: [
        new WebpackDynamicPublicPathPlugin({
            externalPublicPath: "window.externalPublicPath"
        }),
    ]
}
```

**bundle.js**
```js
// before
__webpack_require__.p = "publicPathPlaceholder";

// after
__webpack_require__.p = window.externalPublicPath;
```

## Options

```ts
interface Options {
    externalPublicPath: string; // JavaScript code, here you can define some variable or condition.
    chunkNames: string[]; // Chunk names in which `publicPath` will be replaced.
}

new WebpackDynamicPublicPathPlugin(options: Options);
```

### `chunkNames`

In case if you have several entries you should define plugin instance for each of them.
Check example.

**webpack.config.js**
```js
const WebpackDynamicPublicPathPlugin = require("webpack-dynamic-public-path");

module.exports = {
    entry: {
        'index': path.resolve(__dirname, 'src', 'index.js'),
        'second-chunk': path.resolve(__dirname, 'src', 'second-chunk.js')
    },
    output: {
        filename: '[name].bundle.js',
        publicPath: "publicPathPlaceholder"
    },
    plugins: [
        new WebpackDynamicPublicPathPlugin({
            externalPublicPath: "window.externalPublicPathForMainChunk",
            chunkNames: ['index']
        }),
        new WebpackDynamicPublicPathPlugin({
            externalPublicPath: '"./"',
            chunkNames: ['second-chunk']
        }),
    ]
}
```

**index.bundle.js**
```js
__webpack_require__.p = window.externalPublicPathForMainChunk;
```

**second-chunk.bundle.js**
```js
__webpack_require__.p = "./";
```