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+# @ava/pretty-format [![Travis build status](http://img.shields.io/travis/avajs/pretty-format.svg?style=flat)](https://travis-ci.org/avajs/pretty-format)
+
+> Stringify any JavaScript value.
+
+- Supports [all built-in JavaScript types](#type-support)
+- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd) (similar performance to v8's `JSON.stringify` and significantly faster than Node's `util.format`)
+- Plugin system for extending with custom types (i.e. [`ReactTestComponent`](#reacttestcomponent-plugin))
+
+
+## Installation
+
+```sh
+$ npm install @ava/pretty-format
+```
+
+## Usage
+
+```js
+var prettyFormat = require('pretty-format');
+
+var obj = { property: {} };
+obj.circularReference = obj;
+obj[Symbol('foo')] = 'foo';
+obj.map = new Map();
+obj.map.set('prop', 'value');
+obj.array = [1, NaN, Infinity];
+
+console.log(prettyFormat(obj));
+```
+
+**Result:**
+
+```js
+Object {
+  "property": Object {},
+  "circularReference": [Circular],
+  "map": Map {
+    "prop" => "value"
+  },
+  "array": Array [
+    1,
+    NaN,
+    Infinity
+  ],
+  Symbol(foo): "foo"
+}
+```
+
+#### Type Support
+
+`Object`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`, `arguments`, `Boolean`, `Date`, `Error`, `Function`, `Infinity`, `Map`, `NaN`, `null`, `Number`, `RegExp`, `Set`, `String`, `Symbol`, `undefined`, `WeakMap`, `WeakSet`
+
+### API
+
+```js
+console.log(prettyFormat(object));
+console.log(prettyFormat(object, options));
+```
+
+Options:
+
+* **`callToJSON`**<br>
+  Type: `boolean`, default: `true`<br>
+  Call `toJSON()` on passed object.
+* **`indent`**<br>
+  Type: `number`, default: `2`<br>
+  Number of spaces for indentation.
+* **`maxDepth`**<br>
+  Type: `number`, default: `Infinity`<br>
+  Print only this number of levels.
+* **`min`**<br>
+  Type: `boolean`, default: `false`<br>
+  Print without whitespace.
+* **`plugins`**<br>
+  Type: `array`, default: `[]`<br>
+  Plugins (see the next section).
+* **`printFunctionName`**<br>
+  Type: `boolean`, default: `true`<br>
+  Print function names or just `[Function]`.
+* **`escapeRegex`**<br>
+  Type: `boolean`, default: `false`<br>
+  Escape special characters in regular expressions.
+* **`highlight`**<br>
+  Type: `boolean`, default: `false`<br>
+  Highlight syntax for terminal (works only with `ReactTestComponent` and `ReactElement` plugins.
+* **`theme`**<br>
+  Type: `object`, default: `{tag: 'cyan', content: 'reset'...}`<br>
+  Syntax highlight theme.<br>
+  Uses [ansi-styles colors](https://github.com/chalk/ansi-styles#colors) + `reset` for no color.<br>
+  Available types: `tag`, `content`, `prop` and `value`.
+
+### Plugins
+
+Pretty format also supports adding plugins:
+
+```js
+var fooPlugin = {
+  test: function(val) {
+    return val && val.hasOwnProperty('foo');
+  },
+  print: function(val, print, indent) {
+    return 'Foo: ' + print(val.foo);
+  }
+};
+
+var obj = { foo: { bar: {} } };
+
+prettyFormat(obj, {
+  plugins: [fooPlugin]
+});
+// Foo: Object {
+//   "bar": Object {}
+// }
+```
+
+#### `ReactTestComponent` and `ReactElement` plugins
+
+```js
+var prettyFormat = require('pretty-format');
+var reactTestPlugin = require('pretty-format/plugins/ReactTestComponent');
+var reactElementPlugin = require('pretty-format/plugins/ReactElement');
+
+var React = require('react');
+var renderer = require('react-test-renderer');
+
+var jsx = React.createElement('h1', null, 'Hello World');
+
+prettyFormat(renderer.create(jsx).toJSON(), {
+  plugins: [reactTestPlugin, reactElementPlugin]
+});
+// <h1>
+//   Hello World
+// </h1>
+```