add linting (and some initial fixes)

8 files changed, 726 insertions, 0 deletions

diff --git a/node_modules/@ava/pretty-format/.npmignore b/node_modules/@ava/pretty-format/.npmignore
new file mode 100644
index 000000000..a2dd48210
--- /dev/null
+++ b/node_modules/@ava/pretty-format/.npmignore
@@ -0,0 +1,3 @@
+__tests__
+perf
+.travis.yml
diff --git a/node_modules/@ava/pretty-format/LICENSE.md b/node_modules/@ava/pretty-format/LICENSE.md
new file mode 100755
index 000000000..42a40bb10
--- /dev/null
+++ b/node_modules/@ava/pretty-format/LICENSE.md
@@ -0,0 +1,15 @@
+## ISC License
+
+Copyright (c) 2016, James Kyle <me@thejameskyle.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
diff --git a/node_modules/@ava/pretty-format/README.md b/node_modules/@ava/pretty-format/README.md
new file mode 100755
index 000000000..57e24fc79
--- /dev/null
+++ b/node_modules/@ava/pretty-format/README.md
@@ -0,0 +1,134 @@
+# @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>
+```
diff --git a/node_modules/@ava/pretty-format/index.js b/node_modules/@ava/pretty-format/index.js
new file mode 100644
index 000000000..b9fc698d8
--- /dev/null
+++ b/node_modules/@ava/pretty-format/index.js
@@ -0,0 +1,397 @@
+'use strict';
+
+const keyword = require('esutils').keyword;
+const style = require('ansi-styles');
+const printString = require('./printString');
+
+const toString = Object.prototype.toString;
+const toISOString = Date.prototype.toISOString;
+const errorToString = Error.prototype.toString;
+const regExpToString = RegExp.prototype.toString;
+const symbolToString = Symbol.prototype.toString;
+
+const SYMBOL_REGEXP = /^Symbol\((.*)\)(.*)$/;
+const NEWLINE_REGEXP = /\n/ig;
+
+const getSymbols = Object.getOwnPropertySymbols || (obj => []);
+
+function isToStringedArrayType(toStringed) {
+  return (
+    toStringed === '[object Array]' ||
+    toStringed === '[object ArrayBuffer]' ||
+    toStringed === '[object DataView]' ||
+    toStringed === '[object Float32Array]' ||
+    toStringed === '[object Float64Array]' ||
+    toStringed === '[object Int8Array]' ||
+    toStringed === '[object Int16Array]' ||
+    toStringed === '[object Int32Array]' ||
+    toStringed === '[object Uint8Array]' ||
+    toStringed === '[object Uint8ClampedArray]' ||
+    toStringed === '[object Uint16Array]' ||
+    toStringed === '[object Uint32Array]'
+  );
+}
+
+function printNumber(val) {
+  if (val != +val) return 'NaN';
+  const isNegativeZero = val === 0 && (1 / val) < 0;
+  return isNegativeZero ? '-0' : '' + val;
+}
+
+function printFunction(val, printFunctionName) {
+  if (!printFunctionName) {
+    return '[Function]';
+  } else if (val.name === '') {
+    return '[Function anonymous]'
+  } else {
+    return '[Function ' + val.name + ']';
+  }
+}
+
+function printSymbol(val) {
+  return symbolToString.call(val).replace(SYMBOL_REGEXP, 'Symbol($1)');
+}
+
+function printError(val) {
+  return '[' + errorToString.call(val) + ']';
+}
+
+function printBasicValue(val, printFunctionName, escapeRegex, colors) {
+  if (val === true || val === false) return colors.boolean.open + val + colors.boolean.close;
+  if (val === undefined) return colors.misc.open + 'undefined' + colors.misc.close;
+  if (val === null) return colors.misc.open + 'null' + colors.misc.close;
+
+  const typeOf = typeof val;
+
+  if (typeOf === 'number') return colors.number.open + printNumber(val) + colors.number.close;
+  if (typeOf === 'string') return colors.string.open + '"' + printString(val) + '"' + colors.string.close;
+  if (typeOf === 'function') return colors.function.open + printFunction(val, printFunctionName) + colors.function.close;
+  if (typeOf === 'symbol') return colors.symbol.open + printSymbol(val) + colors.symbol.close;
+
+  const toStringed = toString.call(val);
+
+  if (toStringed === '[object WeakMap]') return colors.label.open + 'WeakMap ' + colors.label.close + colors.bracket.open + '{}' + colors.bracket.close;
+  if (toStringed === '[object WeakSet]') return colors.label.open + 'WeakSet ' + colors.label.close + colors.bracket.open + '{}' + colors.bracket.close;
+  if (toStringed === '[object Function]' || toStringed === '[object GeneratorFunction]') return colors.function.open + printFunction(val, printFunctionName) + colors.function.close;
+  if (toStringed === '[object Symbol]') return colors.symbol.open + printSymbol(val) + colors.symbol.close;
+  if (toStringed === '[object Date]') return colors.date.open + toISOString.call(val) + colors.date.close;
+  if (toStringed === '[object Error]') return colors.error.open + printError(val) + colors.error.close;
+  if (toStringed === '[object RegExp]') {
+    if (escapeRegex) {
+      return colors.regex.open + printString(regExpToString.call(val)) + colors.regex.close;
+    }
+    return colors.regex.open + regExpToString.call(val) + colors.regex.close;
+  };
+  if (toStringed === '[object Arguments]' && val.length === 0) return colors.label.open + 'Arguments ' + colors.label.close + colors.bracket.open + '[]' + colors.bracket.close;
+  if (isToStringedArrayType(toStringed) && val.length === 0) return val.constructor.name + colors.bracket.open + ' []' + colors.bracket.close;
+
+  if (val instanceof Error) return colors.error.open + printError(val) + colors.error.close;
+
+  return false;
+}
+
+function printList(list, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  let body = '';
+
+  if (list.length) {
+    body += edgeSpacing;
+
+    const innerIndent = prevIndent + indent;
+
+    for (let i = 0; i < list.length; i++) {
+      body += innerIndent + print(list[i], indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+
+      if (i < list.length - 1) {
+        body += colors.comma.open + ',' + colors.comma.close + spacing;
+      }
+    }
+
+    body += (min ? '' : colors.comma.open + ',' + colors.comma.close) + edgeSpacing + prevIndent;
+  }
+
+  return colors.bracket.open + '[' + colors.bracket.close + body + colors.bracket.open + ']' + colors.bracket.close;
+}
+
+function printArguments(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  return colors.label.open + (min ? '' : 'Arguments ') + colors.label.close + printList(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+}
+
+function printArray(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  return colors.label.open + (min ? '' : val.constructor.name + ' ') + colors.label.close + printList(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+}
+
+function printKey(key, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  const typeOf = typeof key;
+  if (typeOf === 'string') {
+    if (keyword.isIdentifierNameES6(key, true)) return colors.key.open + key + colors.key.close;
+    if (/^\d+$/.test(key)) return colors.key.open + key + colors.key.close;
+    return colors.key.open + '"' + printString(key) + '"' + colors.key.close;
+  }
+  if (typeOf === 'symbol') return colors.key.open + printSymbol(key) + colors.key.close;
+
+  return print(key, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+}
+
+function printMap(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  let result = colors.label.open + 'Map ' + colors.label.close + colors.bracket.open + '{' + colors.bracket.close;
+  const iterator = val.entries();
+  let current = iterator.next();
+
+  if (!current.done) {
+    result += edgeSpacing;
+
+    const innerIndent = prevIndent + indent;
+
+    while (!current.done) {
+      const key = printKey(current.value[0], indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+      const value = print(current.value[1], indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+
+      result += innerIndent + key + ' => ' + value;
+
+      current = iterator.next();
+
+      if (!current.done) {
+        result += colors.comma.open + ',' + colors.comma.close + spacing;
+      }
+    }
+
+    result += (min ? '' : colors.comma.open + ',' + colors.comma.close) + edgeSpacing + prevIndent;
+  }
+
+  return result + colors.bracket.open + '}' + colors.bracket.close;
+}
+
+function printObject(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  const constructor = min ? '' : (val.constructor ?  val.constructor.name + ' ' : 'Object ');
+  let result = colors.label.open + constructor + colors.label.close + colors.bracket.open + '{' + colors.bracket.close;
+  let keys = Object.keys(val).sort();
+  const symbols = getSymbols(val);
+
+  if (symbols.length) {
+    keys = keys
+      .filter(key => !(typeof key === 'symbol' || toString.call(key) === '[object Symbol]'))
+      .concat(symbols);
+  }
+
+  if (keys.length) {
+    result += edgeSpacing;
+
+    const innerIndent = prevIndent + indent;
+
+    for (let i = 0; i < keys.length; i++) {
+      const key = keys[i];
+      const name = printKey(key, indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+      const value = print(val[key], indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+
+      result += innerIndent + name + ': ' + value;
+
+      if (i < keys.length - 1) {
+        result += colors.comma.open + ',' + colors.comma.close + spacing;
+      }
+    }
+
+    result += (min ? '' : colors.comma.open + ',' + colors.comma.close) + edgeSpacing + prevIndent;
+  }
+
+  return result + colors.bracket.open + '}' + colors.bracket.close;
+}
+
+function printSet(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  let result = colors.label.open + 'Set ' + colors.label.close + colors.bracket.open + '{' + colors.bracket.close;
+  const iterator = val.entries();
+  let current = iterator.next();
+
+  if (!current.done) {
+    result += edgeSpacing;
+
+    const innerIndent = prevIndent + indent;
+
+    while (!current.done) {
+      result += innerIndent + print(current.value[1], indent, innerIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+
+      current = iterator.next();
+
+      if (!current.done) {
+        result += colors.comma.open + ',' + colors.comma.close + spacing;
+      }
+    }
+
+    result += (min ? '' : colors.comma.open + ',' + colors.comma.close) + edgeSpacing + prevIndent;
+  }
+
+  return result + colors.bracket.open + '}' + colors.bracket.close;
+}
+
+function printComplexValue(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  refs = refs.slice();
+  if (refs.indexOf(val) > -1) {
+    return '[Circular]';
+  } else {
+    refs.push(val);
+  }
+
+  currentDepth++;
+
+  const hitMaxDepth = currentDepth > maxDepth;
+
+  if (callToJSON && !hitMaxDepth && val.toJSON && typeof val.toJSON === 'function') {
+    return print(val.toJSON(), indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  }
+
+  const toStringed = toString.call(val);
+  if (toStringed === '[object Arguments]') {
+    return hitMaxDepth ? '[Arguments]' : printArguments(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  } else if (isToStringedArrayType(toStringed)) {
+    return hitMaxDepth ? '[Array]' : printArray(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  } else if (toStringed === '[object Map]') {
+    return hitMaxDepth ? '[Map]' : printMap(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  } else if (toStringed === '[object Set]') {
+    return hitMaxDepth ? '[Set]' : printSet(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  } else if (typeof val === 'object') {
+    return hitMaxDepth ? '[Object]' : printObject(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  }
+}
+
+function printPlugin(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  let match = false;
+  let plugin;
+
+  for (let p = 0; p < plugins.length; p++) {
+    plugin = plugins[p];
+
+    if (plugin.test(val)) {
+      match = true;
+      break;
+    }
+  }
+
+  if (!match) {
+    return false;
+  }
+
+  function boundPrint(val) {
+    return print(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  }
+
+  function boundIndent(str) {
+    const indentation = prevIndent + indent;
+    return indentation + str.replace(NEWLINE_REGEXP, '\n' + indentation);
+  }
+
+  const opts = {
+    edgeSpacing: edgeSpacing,
+    spacing: spacing
+  };
+  return plugin.print(val, boundPrint, boundIndent, opts, colors);
+}
+
+function print(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors) {
+  const basic = printBasicValue(val, printFunctionName, escapeRegex, colors);
+  if (basic) return basic;
+
+  const plugin = printPlugin(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+  if (plugin) return plugin;
+
+  return printComplexValue(val, indent, prevIndent, spacing, edgeSpacing, refs, maxDepth, currentDepth, plugins, min, callToJSON, printFunctionName, escapeRegex, colors);
+}
+
+const DEFAULTS = {
+  callToJSON: true,
+  indent: 2,
+  maxDepth: Infinity,
+  min: false,
+  plugins: [],
+  printFunctionName: true,
+  escapeRegex: false,
+  highlight: false,
+  theme: {
+    tag: 'cyan',
+    content: 'reset',
+    prop: 'yellow',
+    value: 'green',
+    number: 'yellow',
+    string: 'red',
+    date: 'red',
+    symbol: 'red',
+    regex: 'red',
+    function: 'blue',
+    error: 'red',
+    boolean: 'yellow',
+    label: 'blue',
+    bracket: 'grey',
+    comma: 'grey',
+    misc: 'grey',
+    key: 'reset'
+  }
+};
+
+function validateOptions(opts) {
+  Object.keys(opts).forEach(key => {
+    if (!DEFAULTS.hasOwnProperty(key)) {
+      throw new Error('prettyFormat: Invalid option: ' + key);
+    }
+  });
+
+  if (opts.min && opts.indent !== undefined && opts.indent !== 0) {
+    throw new Error('prettyFormat: Cannot run with min option and indent');
+  }
+}
+
+function normalizeOptions(opts) {
+  const result = {};
+
+  Object.keys(DEFAULTS).forEach(key =>
+    result[key] = opts.hasOwnProperty(key) ? opts[key] : DEFAULTS[key]
+  );
+
+  if (result.min) {
+    result.indent = 0;
+  }
+
+  return result;
+}
+
+function createIndent(indent) {
+  return new Array(indent + 1).join(' ');
+}
+
+function prettyFormat(val, opts) {
+  if (!opts) {
+    opts = DEFAULTS;
+  } else {
+    validateOptions(opts)
+    opts = normalizeOptions(opts);
+  }
+
+  let colors = {};
+  Object.keys(opts.theme).forEach(key => {
+    if (opts.highlight) {
+      colors[key] = style[opts.theme[key]];
+    } else {
+      colors[key] = {open: '', close: ''};
+    }
+  });
+
+  let indent;
+  let refs;
+  const prevIndent = '';
+  const currentDepth = 0;
+  const spacing = opts.min ? ' ' : '\n';
+  const edgeSpacing = opts.min ? '' : '\n';
+
+  if (opts && opts.plugins.length) {
+    indent = createIndent(opts.indent);
+    refs = [];
+    var pluginsResult = printPlugin(val, indent, prevIndent, spacing, edgeSpacing, refs, opts.maxDepth, currentDepth, opts.plugins, opts.min, opts.callToJSON, opts.printFunctionName, opts.escapeRegex, colors);
+    if (pluginsResult) return pluginsResult;
+  }
+
+  var basicResult = printBasicValue(val, opts.printFunctionName, opts.escapeRegex, colors);
+  if (basicResult) return basicResult;
+
+  if (!indent) indent = createIndent(opts.indent);
+  if (!refs) refs = [];
+  return printComplexValue(val, indent, prevIndent, spacing, edgeSpacing, refs, opts.maxDepth, currentDepth, opts.plugins, opts.min, opts.callToJSON, opts.printFunctionName, opts.escapeRegex, colors);
+}
+
+module.exports = prettyFormat;
diff --git a/node_modules/@ava/pretty-format/package.json b/node_modules/@ava/pretty-format/package.json
new file mode 100644
index 000000000..9cd6a7b19
--- /dev/null
+++ b/node_modules/@ava/pretty-format/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "@ava/pretty-format",
+  "version": "1.1.0",
+  "description": "Stringify any JavaScript value",
+  "license": "MIT",
+  "repository": "avajs/pretty-format",
+  "author": "James Kyle <me@thejameskyle.com>",
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "test": "jest",
+    "perf": "node perf/test.js"
+  },
+  "dependencies": {
+    "ansi-styles": "^2.2.1",
+    "esutils": "^2.0.2"
+  },
+  "devDependencies": {
+    "chalk": "^1.1.3",
+    "jest": "^15.1.1",
+    "left-pad": "^1.1.1",
+    "react": "15.3.0"
+  },
+  "jest": {
+    "testEnvironment": "node",
+    "verbose": true
+  }
+}
diff --git a/node_modules/@ava/pretty-format/plugins/ReactElement.js b/node_modules/@ava/pretty-format/plugins/ReactElement.js
new file mode 100644
index 000000000..0acd7ea10
--- /dev/null
+++ b/node_modules/@ava/pretty-format/plugins/ReactElement.js
@@ -0,0 +1,83 @@
+'use strict';
+
+const printString = require('../printString');
+
+const reactElement = Symbol.for('react.element');
+
+function traverseChildren(opaqueChildren, cb) {
+  if (Array.isArray(opaqueChildren)) {
+    opaqueChildren.forEach(child => traverseChildren(child, cb));
+  } else if (opaqueChildren != null && opaqueChildren !== false) {
+    cb(opaqueChildren);
+  }
+}
+
+function printChildren(flatChildren, print, indent, colors, opts) {
+  return flatChildren.map(node => {
+    if (typeof node === 'object') {
+      return printElement(node, print, indent, colors, opts);
+    } else if (typeof node === 'string') {
+      return printString(colors.content.open + node + colors.content.close);
+    } else {
+      return print(node);
+    }
+  }).join(opts.edgeSpacing);
+}
+
+function printProps(props, print, indent, colors, opts) {
+  return Object.keys(props).sort().map(name => {
+    if (name === 'children') {
+      return '';
+    }
+
+    const prop = props[name];
+    let printed = print(prop);
+
+    if (typeof prop !== 'string') {
+      if (printed.indexOf('\n') !== -1) {
+        printed = '{' + opts.edgeSpacing + indent(indent(printed) + opts.edgeSpacing + '}');
+      } else {
+        printed = '{' + printed + '}';
+      }
+    }
+
+    return opts.spacing + indent(colors.prop.open + name + colors.prop.close + '=') + colors.value.open + printed + colors.value.close;
+  }).join('');
+}
+
+function printElement(element, print, indent, colors, opts) {
+  let result = colors.tag.open + '<';
+  let elementName;
+  if (typeof element.type === 'string') {
+    elementName = element.type;
+  } else if (typeof element.type === 'function') {
+    elementName = element.type.displayName || element.type.name || 'Unknown';
+  } else {
+    elementName = 'Unknown';
+  }
+  result += elementName + colors.tag.close;
+  result += printProps(element.props, print, indent, colors, opts);
+
+  const opaqueChildren = element.props.children;
+  if (opaqueChildren) {
+    let flatChildren = [];
+    traverseChildren(opaqueChildren, child => {
+      flatChildren.push(child);
+    });
+    const children = printChildren(flatChildren, print, indent, colors, opts);
+    result += colors.tag.open + '>' + colors.tag.close + opts.edgeSpacing + indent(children) + opts.edgeSpacing + colors.tag.open + '</' + elementName + '>' + colors.tag.close;
+  } else {
+    result += colors.tag.open + ' />' + colors.tag.close;
+  }
+
+  return result;
+}
+
+module.exports = {
+  test(object) {
+    return object && object.$$typeof === reactElement;
+  },
+  print(val, print, indent, opts, colors) {
+    return printElement(val, print, indent, colors, opts);
+  }
+};
diff --git a/node_modules/@ava/pretty-format/plugins/ReactTestComponent.js b/node_modules/@ava/pretty-format/plugins/ReactTestComponent.js
new file mode 100644
index 000000000..7d7c79c65
--- /dev/null
+++ b/node_modules/@ava/pretty-format/plugins/ReactTestComponent.js
@@ -0,0 +1,58 @@
+'use strict';
+
+const printString = require('../printString');
+
+const reactTestInstance = Symbol.for('react.test.json');
+
+function printChildren(children, print, indent, colors, opts) {
+  return children.map(child => printInstance(child, print, indent, colors, opts)).join(opts.edgeSpacing);
+}
+
+function printProps(props, print, indent, colors, opts) {
+  return Object.keys(props).sort().map(name => {
+    const prop = props[name];
+    let printed = print(prop);
+
+    if (typeof prop !== 'string') {
+      if (printed.indexOf('\n') !== -1) {
+        printed = '{' + opts.edgeSpacing + indent(indent(printed) + opts.edgeSpacing + '}');
+      } else {
+        printed = '{' + printed + '}';
+      }
+    }
+
+    return opts.spacing + indent(colors.prop.open + name + colors.prop.close + '=') + colors.value.open + printed + colors.value.close;
+  }).join('');
+}
+
+function printInstance(instance, print, indent, colors, opts) {
+  if (typeof instance == 'number') {
+    return print(instance);
+  } else if (typeof instance === 'string') {
+    return printString(colors.content.open + instance + colors.content.close);
+  }
+
+  let result = colors.tag.open + '<' + instance.type + colors.tag.close;
+
+  if (instance.props) {
+    result += printProps(instance.props, print, indent, colors, opts);
+  }
+
+  if (instance.children) {
+    const children = printChildren(instance.children, print, indent, colors, opts);
+    result += colors.tag.open + '>' + colors.tag.close + opts.edgeSpacing + indent(children) + opts.edgeSpacing + colors.tag.open + '</' + instance.type + '>' + colors.tag.close;
+  } else {
+    result += colors.tag.open + ' />' + colors.tag.close;
+  }
+
+  return result;
+}
+
+module.exports = {
+  test(object) {
+    return object && object.$$typeof === reactTestInstance;
+  },
+  print(val, print, indent, opts, colors) {
+    return printInstance(val, print, indent, colors, opts);
+  }
+};
diff --git a/node_modules/@ava/pretty-format/printString.js b/node_modules/@ava/pretty-format/printString.js
new file mode 100644
index 000000000..bf5ea0313
--- /dev/null
+++ b/node_modules/@ava/pretty-format/printString.js
@@ -0,0 +1,7 @@
+'use strict';
+
+const ESCAPED_CHARACTERS = /(\\|\"|\')/g;
+
+module.exports = function printString(val) {
+  return val.replace(ESCAPED_CHARACTERS, '\\$1');
+}