babel-plugin-file-loader

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babel-plugin-file-loader

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Like webpack's file-loader, but on server side. Allows for production-grade require('./file.png')

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# babel-plugin-file-loader [![CI](https://img.shields.io/travis/sheerun/babel-plugin-file-loader/master.svg)](https://travis-ci.org/sheerun/babel-plugin-file-loader) [![Modern Node](https://img.shields.io/badge/modern-node-9BB48F.svg)](https://github.com/sheerun/modern-node)

Works the same as Webpack's [file-loader](https://github.com/webpack-contrib/file-loader/), but on server side. With 95% test coverage!

## Installation

```
yarn add babel-plugin-file-loader
```

Or if you like npm:

```
npm install babel-plugin-file-loader --save
```

Then put following "file-loader" as plugin in .babelrc:

```json
{
  "plugins": ["file-loader"]
}
```

This is equivalent to following default configuration:

```json
{
  "plugins": [
    [
      "file-loader",
      {
        "name": "[hash].[ext]",
        "extensions": ["png", "jpg", "jpeg", "gif", "svg"],
        "publicPath": "/public",
        "outputPath": "/public",
        "context": "",
        "limit": 0
      }
    ]
  ]
}
```

## How it works

More or less as follows:

1. Processes only `import` and `require` that reference files ending with one of `"extensions"`
2. Calculates actual `$name` of resource by substituting placeholders in `"name"`
3. Copies resource into `$ROOT/$outputPath/$name` where `$ROOT` is `.babelrc` location.
4. Replaces `import` and `require` in code with `"$publicPath/$name"` string

## Example usage

```js
import img from './file.png'
const img2 = require('./file.svg')
```

Puts `0dcbbaa7013869e351f.png` and `8d3fe267fe578005541.svg` in the `/public` and replaces code with:

```
const img = "/public/0dcbbaa7013869e351f.png"
const img2 = "/public/8d3fe267fe578005541.svg"
```

For real-life example go to [examples](https://github.com/sheerun/babel-plugin-file-loader/tree/master/examples).

## Options

### outputPath

Tells where to put static files. By default it's `"/public"`.

This path is relative to the root of project. Setting value `null` prevents the plugin to copy the file.

### publicPath

Tells what prefix to output in the source. By default it's `"/public"` as well but it can be even full url, like so: `"http://cdn.example.com/foobar/"`

In this case the resulting code is:

```
const img = "http://cdn.example.com/foobar/0dcbbaa7013869e351f.png"
```

### name

The default is `[hash].[ext]` where:

|     Name     |    Type    |     Default     | Description                                        |
| :----------: | :--------: | :-------------: | :------------------------------------------------- |
| **`[ext]`**  | `{String}` | `file.extname`  | The extension of the resource                      |
| **`[name]`** | `{String}` | `file.basename` | The basename of the resource                       |
| **`[path]`** | `{String}` | `file.dirname`  | The path of the resource relative to the `context` |
| **`[hash]`** | `{String}` |      `md5`      | The hash of the content, see below for more info   |

The full format `[hash]` is: `[<hashType>:hash:<digestType>:<length>]`, where:

|       Name       |    Type    | Default  | Description                                                                           |
| :--------------: | :--------: | :------: | :------------------------------------------------------------------------------------ |
|  **`hashType`**  | `{String}` |  `md5`   | `sha1`, `md5`, `sha256`, `sha512`                                                     |
| **`digestType`** | `{String}` | `base64` | `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64` |
|   **`length`**   | `{Number}` |  `128`   | The length in chars                                                                   |

For example: `[md5:hash:base58:8]` or `[hash:base36]`.

### extensions

List of extension file-loader should look for in imports. All other imports are ignored.

### context

Path to directory relative to `.babelrc` where application source resides. By default `""`, but can be e.g. `"/src"`.

### limit

Value in byte to determine if the content is base64 inlined. In that case, the file is not copy to `outputPath`. It replicates [url-loader](https://github.com/webpack-contrib/url-loader) webpack loader behaviour.

Default is 0 which means nothing is inlined.

## Contributing

Yes, please!

## License

MIT

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