[npm]: https://img.shields.io/npm/v/@rollup/plugin-json
[npm-url]: https://www.npmjs.com/package/@rollup/plugin-json
[size]: https://packagephobia.now.sh/badge?p=@rollup/plugin-json
[size-url]: https://packagephobia.now.sh/result?p=@rollup/plugin-json

[![npm][npm]][npm-url]
[![size][size]][size-url]
[![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)](https://liberamanifesto.com)

# @rollup/plugin-json

🍣 A Rollup plugin which Converts .json files to ES6 modules.

## Requirements

This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v1.20.0+.

## Install

Using npm:

```console
npm install @rollup/plugin-json --save-dev
```

## Usage

Create a `rollup.config.js` [configuration file](https://www.rollupjs.org/guide/en/#configuration-files) and import the plugin:

```js
import json from '@rollup/plugin-json';

export default {
  input: 'src/index.js',
  output: {
    dir: 'output',
    format: 'cjs'
  },
  plugins: [json()]
};
```

Then call `rollup` either via the [CLI](https://www.rollupjs.org/guide/en/#command-line-reference) or the [API](https://www.rollupjs.org/guide/en/#javascript-api).

With an accompanying file `src/index.js`, the local `package.json` file would now be importable as seen below:

```js
// src/index.js
import { readFileSync } from 'fs';

const pkg = JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf8'));
console.log(`running version ${pkg.version}`);
```

## Options

### `compact`

Type: `Boolean`<br>
Default: `false`

If `true`, instructs the plugin to ignore `indent` and generates the smallest code.

### `exclude`

Type: `String` | `Array[...String]`<br>
Default: `null`

A [picomatch pattern](https://github.com/micromatch/picomatch), or array of patterns, which specifies the files in the build the plugin should _ignore_. By default no files are ignored.

### `include`

Type: `String` | `Array[...String]`<br>
Default: `null`

A [picomatch pattern](https://github.com/micromatch/picomatch), or array of patterns, which specifies the files in the build the plugin should operate on. By default all files are targeted.

### `includeArbitraryNames`

Type: `Boolean`<br>
Default: `false`

If `true` and `namedExports` is `true`, generates a named export for not a valid identifier properties of the JSON object by leveraging the ["Arbitrary Module Namespace Identifier Names" feature](https://github.com/tc39/ecma262/pull/2154).

### `indent`

Type: `String`<br>
Default: `'\t'`

Specifies the indentation for the generated default export.

### `namedExports`

Type: `Boolean`<br>
Default: `true`

If `true`, instructs the plugin to generate a named export for every property of the JSON object.

### `preferConst`

Type: `Boolean`<br>
Default: `false`

If `true`, instructs the plugin to declare properties as variables, using either `var` or `const`. This pertains to tree-shaking.

## Meta

[CONTRIBUTING](/.github/CONTRIBUTING.md)

[LICENSE (MIT)](/LICENSE)
