(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('react')) :
	typeof define === 'function' && define.amd ? define(['exports', 'react'], factory) :
	(factory((global.ReachRouter = {}),global.React));
}(this, (function (exports,React) { 'use strict';

React = React && React.hasOwnProperty('default') ? React['default'] : React;

/**
 * Copyright 2014-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function unwrapExports (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */

function makeEmptyFunction(arg) {
  return function () {
    return arg;
  };
}

/**
 * This function accepts and discards inputs; it has no side effects. This is
 * primarily useful idiomatically for overridable function endpoints which
 * always need to be callable, since JS lacks a null-call idiom ala Cocoa.
 */
var emptyFunction = function emptyFunction() {};

emptyFunction.thatReturns = makeEmptyFunction;
emptyFunction.thatReturnsFalse = makeEmptyFunction(false);
emptyFunction.thatReturnsTrue = makeEmptyFunction(true);
emptyFunction.thatReturnsNull = makeEmptyFunction(null);
emptyFunction.thatReturnsThis = function () {
  return this;
};
emptyFunction.thatReturnsArgument = function (arg) {
  return arg;
};

var emptyFunction_1 = emptyFunction;

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

/**
 * Use invariant() to assert state which your program assumes to be true.
 *
 * Provide sprintf-style format (only %s is supported) and arguments
 * to provide information about what broke and what you were
 * expecting.
 *
 * The invariant message will be stripped in production, but the invariant
 * will remain to ensure logic does not differ in production.
 */

var validateFormat = function validateFormat(format) {};

{
  validateFormat = function validateFormat(format) {
    if (format === undefined) {
      throw new Error('invariant requires an error message argument');
    }
  };
}

function invariant(condition, format, a, b, c, d, e, f) {
  validateFormat(format);

  if (!condition) {
    var error;
    if (format === undefined) {
      error = new Error('Minified exception occurred; use the non-minified dev environment ' + 'for the full error message and additional helpful warnings.');
    } else {
      var args = [a, b, c, d, e, f];
      var argIndex = 0;
      error = new Error(format.replace(/%s/g, function () {
        return args[argIndex++];
      }));
      error.name = 'Invariant Violation';
    }

    error.framesToPop = 1; // we don't care about invariant's own frame
    throw error;
  }
}

var invariant_1 = invariant;

/**
 * Similar to invariant but only logs a warning if the condition is not met.
 * This can be used to log issues in development environments in critical
 * paths. Removing the logging code for production environments will keep the
 * same logic and follow the same code paths.
 */

var warning$1 = emptyFunction_1;

{
  var printWarning = function printWarning(format) {
    for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      args[_key - 1] = arguments[_key];
    }

    var argIndex = 0;
    var message = 'Warning: ' + format.replace(/%s/g, function () {
      return args[argIndex++];
    });
    if (typeof console !== 'undefined') {
      console.error(message);
    }
    try {
      // --- Welcome to debugging React ---
      // This error was thrown as a convenience so that you can use this stack
      // to find the callsite that caused this warning to fire.
      throw new Error(message);
    } catch (x) {}
  };

  warning$1 = function warning(condition, format) {
    if (format === undefined) {
      throw new Error('`warning(condition, format, ...args)` requires a warning ' + 'message argument');
    }

    if (format.indexOf('Failed Composite propType: ') === 0) {
      return; // Ignore CompositeComponent proptype check.
    }

    if (!condition) {
      for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
        args[_key2 - 2] = arguments[_key2];
      }

      printWarning.apply(undefined, [format].concat(args));
    }
  };
}

var warning_1$1 = warning$1;

/*
object-assign
(c) Sindre Sorhus
@license MIT
*/
/* eslint-disable no-unused-vars */
var getOwnPropertySymbols = Object.getOwnPropertySymbols;
var hasOwnProperty = Object.prototype.hasOwnProperty;
var propIsEnumerable = Object.prototype.propertyIsEnumerable;

function toObject(val) {
	if (val === null || val === undefined) {
		throw new TypeError('Object.assign cannot be called with null or undefined');
	}

	return Object(val);
}

function shouldUseNative() {
	try {
		if (!Object.assign) {
			return false;
		}

		// Detect buggy property enumeration order in older V8 versions.

		// https://bugs.chromium.org/p/v8/issues/detail?id=4118
		var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
		test1[5] = 'de';
		if (Object.getOwnPropertyNames(test1)[0] === '5') {
			return false;
		}

		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
		var test2 = {};
		for (var i = 0; i < 10; i++) {
			test2['_' + String.fromCharCode(i)] = i;
		}
		var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
			return test2[n];
		});
		if (order2.join('') !== '0123456789') {
			return false;
		}

		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
		var test3 = {};
		'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
			test3[letter] = letter;
		});
		if (Object.keys(Object.assign({}, test3)).join('') !==
				'abcdefghijklmnopqrst') {
			return false;
		}

		return true;
	} catch (err) {
		// We don't expect any of the above to throw, but better to be safe.
		return false;
	}
}

var objectAssign = shouldUseNative() ? Object.assign : function (target, source) {
	var from;
	var to = toObject(target);
	var symbols;

	for (var s = 1; s < arguments.length; s++) {
		from = Object(arguments[s]);

		for (var key in from) {
			if (hasOwnProperty.call(from, key)) {
				to[key] = from[key];
			}
		}

		if (getOwnPropertySymbols) {
			symbols = getOwnPropertySymbols(from);
			for (var i = 0; i < symbols.length; i++) {
				if (propIsEnumerable.call(from, symbols[i])) {
					to[symbols[i]] = from[symbols[i]];
				}
			}
		}
	}

	return to;
};

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

var ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

var ReactPropTypesSecret_1 = ReactPropTypesSecret;

{
  var invariant$1 = invariant_1;
  var warning$2 = warning_1$1;
  var ReactPropTypesSecret$1 = ReactPropTypesSecret_1;
  var loggedTypeFailures = {};
}

/**
 * Assert that the values match with the type specs.
 * Error messages are memorized and will only be shown once.
 *
 * @param {object} typeSpecs Map of name to a ReactPropType
 * @param {object} values Runtime values that need to be type-checked
 * @param {string} location e.g. "prop", "context", "child context"
 * @param {string} componentName Name of the component for error messages.
 * @param {?Function} getStack Returns the component stack.
 * @private
 */
function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
  {
    for (var typeSpecName in typeSpecs) {
      if (typeSpecs.hasOwnProperty(typeSpecName)) {
        var error;
        // Prop type validation may throw. In case they do, we don't want to
        // fail the render phase where it didn't fail before. So we log it.
        // After these have been cleaned up, we'll let them throw.
        try {
          // This is intentionally an invariant that gets caught. It's the same
          // behavior as without this statement except with a better message.
          invariant$1(typeof typeSpecs[typeSpecName] === 'function', '%s: %s type `%s` is invalid; it must be a function, usually from ' + 'the `prop-types` package, but received `%s`.', componentName || 'React class', location, typeSpecName, typeof typeSpecs[typeSpecName]);
          error = typeSpecs[typeSpecName](values, typeSpecName, componentName, location, null, ReactPropTypesSecret$1);
        } catch (ex) {
          error = ex;
        }
        warning$2(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', location, typeSpecName, typeof error);
        if (error instanceof Error && !(error.message in loggedTypeFailures)) {
          // Only monitor this failure once because there tends to be a lot of the
          // same error.
          loggedTypeFailures[error.message] = true;

          var stack = getStack ? getStack() : '';

          warning$2(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
        }
      }
    }
  }
}

var checkPropTypes_1 = checkPropTypes;

var factoryWithTypeCheckers = function(isValidElement, throwOnDirectAccess) {
  /* global Symbol */
  var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
  var FAUX_ITERATOR_SYMBOL = '@@iterator'; // Before Symbol spec.

  /**
   * Returns the iterator method function contained on the iterable object.
   *
   * Be sure to invoke the function with the iterable as context:
   *
   *     var iteratorFn = getIteratorFn(myIterable);
   *     if (iteratorFn) {
   *       var iterator = iteratorFn.call(myIterable);
   *       ...
   *     }
   *
   * @param {?object} maybeIterable
   * @return {?function}
   */
  function getIteratorFn(maybeIterable) {
    var iteratorFn = maybeIterable && (ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]);
    if (typeof iteratorFn === 'function') {
      return iteratorFn;
    }
  }

  /**
   * Collection of methods that allow declaration and validation of props that are
   * supplied to React components. Example usage:
   *
   *   var Props = require('ReactPropTypes');
   *   var MyArticle = React.createClass({
   *     propTypes: {
   *       // An optional string prop named "description".
   *       description: Props.string,
   *
   *       // A required enum prop named "category".
   *       category: Props.oneOf(['News','Photos']).isRequired,
   *
   *       // A prop named "dialog" that requires an instance of Dialog.
   *       dialog: Props.instanceOf(Dialog).isRequired
   *     },
   *     render: function() { ... }
   *   });
   *
   * A more formal specification of how these methods are used:
   *
   *   type := array|bool|func|object|number|string|oneOf([...])|instanceOf(...)
   *   decl := ReactPropTypes.{type}(.isRequired)?
   *
   * Each and every declaration produces a function with the same signature. This
   * allows the creation of custom validation functions. For example:
   *
   *  var MyLink = React.createClass({
   *    propTypes: {
   *      // An optional string or URI prop named "href".
   *      href: function(props, propName, componentName) {
   *        var propValue = props[propName];
   *        if (propValue != null && typeof propValue !== 'string' &&
   *            !(propValue instanceof URI)) {
   *          return new Error(
   *            'Expected a string or an URI for ' + propName + ' in ' +
   *            componentName
   *          );
   *        }
   *      }
   *    },
   *    render: function() {...}
   *  });
   *
   * @internal
   */

  var ANONYMOUS = '<<anonymous>>';

  // Important!
  // Keep this list in sync with production version in `./factoryWithThrowingShims.js`.
  var ReactPropTypes = {
    array: createPrimitiveTypeChecker('array'),
    bool: createPrimitiveTypeChecker('boolean'),
    func: createPrimitiveTypeChecker('function'),
    number: createPrimitiveTypeChecker('number'),
    object: createPrimitiveTypeChecker('object'),
    string: createPrimitiveTypeChecker('string'),
    symbol: createPrimitiveTypeChecker('symbol'),

    any: createAnyTypeChecker(),
    arrayOf: createArrayOfTypeChecker,
    element: createElementTypeChecker(),
    instanceOf: createInstanceTypeChecker,
    node: createNodeChecker(),
    objectOf: createObjectOfTypeChecker,
    oneOf: createEnumTypeChecker,
    oneOfType: createUnionTypeChecker,
    shape: createShapeTypeChecker,
    exact: createStrictShapeTypeChecker,
  };

  /**
   * inlined Object.is polyfill to avoid requiring consumers ship their own
   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
   */
  /*eslint-disable no-self-compare*/
  function is(x, y) {
    // SameValue algorithm
    if (x === y) {
      // Steps 1-5, 7-10
      // Steps 6.b-6.e: +0 != -0
      return x !== 0 || 1 / x === 1 / y;
    } else {
      // Step 6.a: NaN == NaN
      return x !== x && y !== y;
    }
  }
  /*eslint-enable no-self-compare*/

  /**
   * We use an Error-like object for backward compatibility as people may call
   * PropTypes directly and inspect their output. However, we don't use real
   * Errors anymore. We don't inspect their stack anyway, and creating them
   * is prohibitively expensive if they are created too often, such as what
   * happens in oneOfType() for any type before the one that matched.
   */
  function PropTypeError(message) {
    this.message = message;
    this.stack = '';
  }
  // Make `instanceof Error` still work for returned errors.
  PropTypeError.prototype = Error.prototype;

  function createChainableTypeChecker(validate) {
    {
      var manualPropTypeCallCache = {};
      var manualPropTypeWarningCount = 0;
    }
    function checkType(isRequired, props, propName, componentName, location, propFullName, secret) {
      componentName = componentName || ANONYMOUS;
      propFullName = propFullName || propName;

      if (secret !== ReactPropTypesSecret_1) {
        if (throwOnDirectAccess) {
          // New behavior only for users of `prop-types` package
          invariant_1(
            false,
            'Calling PropTypes validators directly is not supported by the `prop-types` package. ' +
            'Use `PropTypes.checkPropTypes()` to call them. ' +
            'Read more at http://fb.me/use-check-prop-types'
          );
        } else if ("development" !== 'production' && typeof console !== 'undefined') {
          // Old behavior for people using React.PropTypes
          var cacheKey = componentName + ':' + propName;
          if (
            !manualPropTypeCallCache[cacheKey] &&
            // Avoid spamming the console because they are often not actionable except for lib authors
            manualPropTypeWarningCount < 3
          ) {
            warning_1$1(
              false,
              'You are manually calling a React.PropTypes validation ' +
              'function for the `%s` prop on `%s`. This is deprecated ' +
              'and will throw in the standalone `prop-types` package. ' +
              'You may be seeing this warning due to a third-party PropTypes ' +
              'library. See https://fb.me/react-warning-dont-call-proptypes ' + 'for details.',
              propFullName,
              componentName
            );
            manualPropTypeCallCache[cacheKey] = true;
            manualPropTypeWarningCount++;
          }
        }
      }
      if (props[propName] == null) {
        if (isRequired) {
          if (props[propName] === null) {
            return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required ' + ('in `' + componentName + '`, but its value is `null`.'));
          }
          return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required in ' + ('`' + componentName + '`, but its value is `undefined`.'));
        }
        return null;
      } else {
        return validate(props, propName, componentName, location, propFullName);
      }
    }

    var chainedCheckType = checkType.bind(null, false);
    chainedCheckType.isRequired = checkType.bind(null, true);

    return chainedCheckType;
  }

  function createPrimitiveTypeChecker(expectedType) {
    function validate(props, propName, componentName, location, propFullName, secret) {
      var propValue = props[propName];
      var propType = getPropType(propValue);
      if (propType !== expectedType) {
        // `propValue` being instance of, say, date/regexp, pass the 'object'
        // check, but we can offer a more precise error message here rather than
        // 'of type `object`'.
        var preciseType = getPreciseType(propValue);

        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + preciseType + '` supplied to `' + componentName + '`, expected ') + ('`' + expectedType + '`.'));
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createAnyTypeChecker() {
    return createChainableTypeChecker(emptyFunction_1.thatReturnsNull);
  }

  function createArrayOfTypeChecker(typeChecker) {
    function validate(props, propName, componentName, location, propFullName) {
      if (typeof typeChecker !== 'function') {
        return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside arrayOf.');
      }
      var propValue = props[propName];
      if (!Array.isArray(propValue)) {
        var propType = getPropType(propValue);
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an array.'));
      }
      for (var i = 0; i < propValue.length; i++) {
        var error = typeChecker(propValue, i, componentName, location, propFullName + '[' + i + ']', ReactPropTypesSecret_1);
        if (error instanceof Error) {
          return error;
        }
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createElementTypeChecker() {
    function validate(props, propName, componentName, location, propFullName) {
      var propValue = props[propName];
      if (!isValidElement(propValue)) {
        var propType = getPropType(propValue);
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected a single ReactElement.'));
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createInstanceTypeChecker(expectedClass) {
    function validate(props, propName, componentName, location, propFullName) {
      if (!(props[propName] instanceof expectedClass)) {
        var expectedClassName = expectedClass.name || ANONYMOUS;
        var actualClassName = getClassName(props[propName]);
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + actualClassName + '` supplied to `' + componentName + '`, expected ') + ('instance of `' + expectedClassName + '`.'));
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createEnumTypeChecker(expectedValues) {
    if (!Array.isArray(expectedValues)) {
      warning_1$1(false, 'Invalid argument supplied to oneOf, expected an instance of array.');
      return emptyFunction_1.thatReturnsNull;
    }

    function validate(props, propName, componentName, location, propFullName) {
      var propValue = props[propName];
      for (var i = 0; i < expectedValues.length; i++) {
        if (is(propValue, expectedValues[i])) {
          return null;
        }
      }

      var valuesString = JSON.stringify(expectedValues);
      return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of value `' + propValue + '` ' + ('supplied to `' + componentName + '`, expected one of ' + valuesString + '.'));
    }
    return createChainableTypeChecker(validate);
  }

  function createObjectOfTypeChecker(typeChecker) {
    function validate(props, propName, componentName, location, propFullName) {
      if (typeof typeChecker !== 'function') {
        return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside objectOf.');
      }
      var propValue = props[propName];
      var propType = getPropType(propValue);
      if (propType !== 'object') {
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an object.'));
      }
      for (var key in propValue) {
        if (propValue.hasOwnProperty(key)) {
          var error = typeChecker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
          if (error instanceof Error) {
            return error;
          }
        }
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createUnionTypeChecker(arrayOfTypeCheckers) {
    if (!Array.isArray(arrayOfTypeCheckers)) {
      warning_1$1(false, 'Invalid argument supplied to oneOfType, expected an instance of array.');
      return emptyFunction_1.thatReturnsNull;
    }

    for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
      var checker = arrayOfTypeCheckers[i];
      if (typeof checker !== 'function') {
        warning_1$1(
          false,
          'Invalid argument supplied to oneOfType. Expected an array of check functions, but ' +
          'received %s at index %s.',
          getPostfixForTypeWarning(checker),
          i
        );
        return emptyFunction_1.thatReturnsNull;
      }
    }

    function validate(props, propName, componentName, location, propFullName) {
      for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
        var checker = arrayOfTypeCheckers[i];
        if (checker(props, propName, componentName, location, propFullName, ReactPropTypesSecret_1) == null) {
          return null;
        }
      }

      return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`.'));
    }
    return createChainableTypeChecker(validate);
  }

  function createNodeChecker() {
    function validate(props, propName, componentName, location, propFullName) {
      if (!isNode(props[propName])) {
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`, expected a ReactNode.'));
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createShapeTypeChecker(shapeTypes) {
    function validate(props, propName, componentName, location, propFullName) {
      var propValue = props[propName];
      var propType = getPropType(propValue);
      if (propType !== 'object') {
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
      }
      for (var key in shapeTypes) {
        var checker = shapeTypes[key];
        if (!checker) {
          continue;
        }
        var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
        if (error) {
          return error;
        }
      }
      return null;
    }
    return createChainableTypeChecker(validate);
  }

  function createStrictShapeTypeChecker(shapeTypes) {
    function validate(props, propName, componentName, location, propFullName) {
      var propValue = props[propName];
      var propType = getPropType(propValue);
      if (propType !== 'object') {
        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
      }
      // We need to check all keys in case some are required but missing from
      // props.
      var allKeys = objectAssign({}, props[propName], shapeTypes);
      for (var key in allKeys) {
        var checker = shapeTypes[key];
        if (!checker) {
          return new PropTypeError(
            'Invalid ' + location + ' `' + propFullName + '` key `' + key + '` supplied to `' + componentName + '`.' +
            '\nBad object: ' + JSON.stringify(props[propName], null, '  ') +
            '\nValid keys: ' +  JSON.stringify(Object.keys(shapeTypes), null, '  ')
          );
        }
        var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
        if (error) {
          return error;
        }
      }
      return null;
    }

    return createChainableTypeChecker(validate);
  }

  function isNode(propValue) {
    switch (typeof propValue) {
      case 'number':
      case 'string':
      case 'undefined':
        return true;
      case 'boolean':
        return !propValue;
      case 'object':
        if (Array.isArray(propValue)) {
          return propValue.every(isNode);
        }
        if (propValue === null || isValidElement(propValue)) {
          return true;
        }

        var iteratorFn = getIteratorFn(propValue);
        if (iteratorFn) {
          var iterator = iteratorFn.call(propValue);
          var step;
          if (iteratorFn !== propValue.entries) {
            while (!(step = iterator.next()).done) {
              if (!isNode(step.value)) {
                return false;
              }
            }
          } else {
            // Iterator will provide entry [k,v] tuples rather than values.
            while (!(step = iterator.next()).done) {
              var entry = step.value;
              if (entry) {
                if (!isNode(entry[1])) {
                  return false;
                }
              }
            }
          }
        } else {
          return false;
        }

        return true;
      default:
        return false;
    }
  }

  function isSymbol(propType, propValue) {
    // Native Symbol.
    if (propType === 'symbol') {
      return true;
    }

    // 19.4.3.5 Symbol.prototype[@@toStringTag] === 'Symbol'
    if (propValue['@@toStringTag'] === 'Symbol') {
      return true;
    }

    // Fallback for non-spec compliant Symbols which are polyfilled.
    if (typeof Symbol === 'function' && propValue instanceof Symbol) {
      return true;
    }

    return false;
  }

  // Equivalent of `typeof` but with special handling for array and regexp.
  function getPropType(propValue) {
    var propType = typeof propValue;
    if (Array.isArray(propValue)) {
      return 'array';
    }
    if (propValue instanceof RegExp) {
      // Old webkits (at least until Android 4.0) return 'function' rather than
      // 'object' for typeof a RegExp. We'll normalize this here so that /bla/
      // passes PropTypes.object.
      return 'object';
    }
    if (isSymbol(propType, propValue)) {
      return 'symbol';
    }
    return propType;
  }

  // This handles more types than `getPropType`. Only used for error messages.
  // See `createPrimitiveTypeChecker`.
  function getPreciseType(propValue) {
    if (typeof propValue === 'undefined' || propValue === null) {
      return '' + propValue;
    }
    var propType = getPropType(propValue);
    if (propType === 'object') {
      if (propValue instanceof Date) {
        return 'date';
      } else if (propValue instanceof RegExp) {
        return 'regexp';
      }
    }
    return propType;
  }

  // Returns a string that is postfixed to a warning about an invalid type.
  // For example, "undefined" or "of type array"
  function getPostfixForTypeWarning(value) {
    var type = getPreciseType(value);
    switch (type) {
      case 'array':
      case 'object':
        return 'an ' + type;
      case 'boolean':
      case 'date':
      case 'regexp':
        return 'a ' + type;
      default:
        return type;
    }
  }

  // Returns class name of the object, if any.
  function getClassName(propValue) {
    if (!propValue.constructor || !propValue.constructor.name) {
      return ANONYMOUS;
    }
    return propValue.constructor.name;
  }

  ReactPropTypes.checkPropTypes = checkPropTypes_1;
  ReactPropTypes.PropTypes = ReactPropTypes;

  return ReactPropTypes;
};

var propTypes = createCommonjsModule(function (module) {
/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

{
  var REACT_ELEMENT_TYPE = (typeof Symbol === 'function' &&
    Symbol.for &&
    Symbol.for('react.element')) ||
    0xeac7;

  var isValidElement = function(object) {
    return typeof object === 'object' &&
      object !== null &&
      object.$$typeof === REACT_ELEMENT_TYPE;
  };

  // By explicitly using `prop-types` you are opting into new development behavior.
  // http://fb.me/prop-types-in-prod
  var throwOnDirectAccess = true;
  module.exports = factoryWithTypeCheckers(isValidElement, throwOnDirectAccess);
}
});

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/**
 * Use invariant() to assert state which your program assumes to be true.
 *
 * Provide sprintf-style format (only %s is supported) and arguments
 * to provide information about what broke and what you were
 * expecting.
 *
 * The invariant message will be stripped in production, but the invariant
 * will remain to ensure logic does not differ in production.
 */

var NODE_ENV = "development";

var invariant$2 = function(condition, format, a, b, c, d, e, f) {
  if (NODE_ENV !== 'production') {
    if (format === undefined) {
      throw new Error('invariant requires an error message argument');
    }
  }

  if (!condition) {
    var error;
    if (format === undefined) {
      error = new Error(
        'Minified exception occurred; use the non-minified dev environment ' +
        'for the full error message and additional helpful warnings.'
      );
    } else {
      var args = [a, b, c, d, e, f];
      var argIndex = 0;
      error = new Error(
        format.replace(/%s/g, function() { return args[argIndex++]; })
      );
      error.name = 'Invariant Violation';
    }

    error.framesToPop = 1; // we don't care about invariant's own frame
    throw error;
  }
};

var invariant_1$1 = invariant$2;

var key = '__global_unique_id__';

var gud = function() {
  return commonjsGlobal[key] = (commonjsGlobal[key] || 0) + 1;
};

var implementation = createCommonjsModule(function (module, exports) {

exports.__esModule = true;



var _react2 = _interopRequireDefault(React);



var _propTypes2 = _interopRequireDefault(propTypes);



var _gud2 = _interopRequireDefault(gud);



var _warning2 = _interopRequireDefault(warning_1$1);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var MAX_SIGNED_31_BIT_INT = 1073741823;

// Inlined Object.is polyfill.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
function objectIs(x, y) {
  if (x === y) {
    return x !== 0 || 1 / x === 1 / y;
  } else {
    return x !== x && y !== y;
  }
}

function createEventEmitter(value) {
  var handlers = [];
  return {
    on: function on(handler) {
      handlers.push(handler);
    },
    off: function off(handler) {
      handlers = handlers.filter(function (h) {
        return h !== handler;
      });
    },
    get: function get() {
      return value;
    },
    set: function set(newValue, changedBits) {
      value = newValue;
      handlers.forEach(function (handler) {
        return handler(value, changedBits);
      });
    }
  };
}

function onlyChild(children) {
  return Array.isArray(children) ? children[0] : children;
}

function createReactContext(defaultValue, calculateChangedBits) {
  var _Provider$childContex, _Consumer$contextType;

  var contextProp = '__create-react-context-' + (0, _gud2.default)() + '__';

  var Provider = function (_Component) {
    _inherits(Provider, _Component);

    function Provider() {
      var _temp, _this, _ret;

      _classCallCheck(this, Provider);

      for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      return _ret = (_temp = (_this = _possibleConstructorReturn(this, _Component.call.apply(_Component, [this].concat(args))), _this), _this.emitter = createEventEmitter(_this.props.value), _temp), _possibleConstructorReturn(_this, _ret);
    }

    Provider.prototype.getChildContext = function getChildContext() {
      var _ref;

      return _ref = {}, _ref[contextProp] = this.emitter, _ref;
    };

    Provider.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {
      if (this.props.value !== nextProps.value) {
        var oldValue = this.props.value;
        var newValue = nextProps.value;
        var changedBits = void 0;

        if (objectIs(oldValue, newValue)) {
          changedBits = 0; // No change
        } else {
          changedBits = typeof calculateChangedBits === 'function' ? calculateChangedBits(oldValue, newValue) : MAX_SIGNED_31_BIT_INT;
          {
            (0, _warning2.default)((changedBits & MAX_SIGNED_31_BIT_INT) === changedBits, 'calculateChangedBits: Expected the return value to be a ' + '31-bit integer. Instead received: %s', changedBits);
          }

          changedBits |= 0;

          if (changedBits !== 0) {
            this.emitter.set(nextProps.value, changedBits);
          }
        }
      }
    };

    Provider.prototype.render = function render() {
      return this.props.children;
    };

    return Provider;
  }(React.Component);

  Provider.childContextTypes = (_Provider$childContex = {}, _Provider$childContex[contextProp] = _propTypes2.default.object.isRequired, _Provider$childContex);

  var Consumer = function (_Component2) {
    _inherits(Consumer, _Component2);

    function Consumer() {
      var _temp2, _this2, _ret2;

      _classCallCheck(this, Consumer);

      for (var _len2 = arguments.length, args = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
        args[_key2] = arguments[_key2];
      }

      return _ret2 = (_temp2 = (_this2 = _possibleConstructorReturn(this, _Component2.call.apply(_Component2, [this].concat(args))), _this2), _this2.state = {
        value: _this2.getValue()
      }, _this2.onUpdate = function (newValue, changedBits) {
        var observedBits = _this2.observedBits | 0;
        if ((observedBits & changedBits) !== 0) {
          _this2.setState({ value: _this2.getValue() });
        }
      }, _temp2), _possibleConstructorReturn(_this2, _ret2);
    }

    Consumer.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {
      var observedBits = nextProps.observedBits;

      this.observedBits = observedBits === undefined || observedBits === null ? MAX_SIGNED_31_BIT_INT // Subscribe to all changes by default
      : observedBits;
    };

    Consumer.prototype.componentDidMount = function componentDidMount() {
      if (this.context[contextProp]) {
        this.context[contextProp].on(this.onUpdate);
      }
      var observedBits = this.props.observedBits;

      this.observedBits = observedBits === undefined || observedBits === null ? MAX_SIGNED_31_BIT_INT // Subscribe to all changes by default
      : observedBits;
    };

    Consumer.prototype.componentWillUnmount = function componentWillUnmount() {
      if (this.context[contextProp]) {
        this.context[contextProp].off(this.onUpdate);
      }
    };

    Consumer.prototype.getValue = function getValue() {
      if (this.context[contextProp]) {
        return this.context[contextProp].get();
      } else {
        return defaultValue;
      }
    };

    Consumer.prototype.render = function render() {
      return onlyChild(this.props.children)(this.state.value);
    };

    return Consumer;
  }(React.Component);

  Consumer.contextTypes = (_Consumer$contextType = {}, _Consumer$contextType[contextProp] = _propTypes2.default.object, _Consumer$contextType);


  return {
    Provider: Provider,
    Consumer: Consumer
  };
}

exports.default = _react2.default.createContext || createReactContext;
module.exports = exports['default'];
});

unwrapExports(implementation);

var lib = createCommonjsModule(function (module, exports) {

exports.__esModule = true;



var _react2 = _interopRequireDefault(React);



var _implementation2 = _interopRequireDefault(implementation);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

exports.default = _react2.default.createContext || _implementation2.default;
module.exports = exports['default'];
});

var createContext = unwrapExports(lib);

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

function componentWillMount() {
  // Call this.constructor.gDSFP to support sub-classes.
  var state = this.constructor.getDerivedStateFromProps(this.props, this.state);
  if (state !== null && state !== undefined) {
    this.setState(state);
  }
}

function componentWillReceiveProps(nextProps) {
  // Call this.constructor.gDSFP to support sub-classes.
  // Use the setState() updater to ensure state isn't stale in certain edge cases.
  function updater(prevState) {
    var state = this.constructor.getDerivedStateFromProps(nextProps, prevState);
    return state !== null && state !== undefined ? state : null;
  }
  // Binding "this" is important for shallow renderer support.
  this.setState(updater.bind(this));
}

function componentWillUpdate(nextProps, nextState) {
  try {
    var prevProps = this.props;
    var prevState = this.state;
    this.props = nextProps;
    this.state = nextState;
    this.__reactInternalSnapshotFlag = true;
    this.__reactInternalSnapshot = this.getSnapshotBeforeUpdate(
      prevProps,
      prevState
    );
  } finally {
    this.props = prevProps;
    this.state = prevState;
  }
}

// React may warn about cWM/cWRP/cWU methods being deprecated.
// Add a flag to suppress these warnings for this special case.
componentWillMount.__suppressDeprecationWarning = true;
componentWillReceiveProps.__suppressDeprecationWarning = true;
componentWillUpdate.__suppressDeprecationWarning = true;

function polyfill(Component) {
  var prototype = Component.prototype;

  if (!prototype || !prototype.isReactComponent) {
    throw new Error('Can only polyfill class components');
  }

  if (
    typeof Component.getDerivedStateFromProps !== 'function' &&
    typeof prototype.getSnapshotBeforeUpdate !== 'function'
  ) {
    return Component;
  }

  // If new component APIs are defined, "unsafe" lifecycles won't be called.
  // Error if any of these lifecycles are present,
  // Because they would work differently between older and newer (16.3+) versions of React.
  var foundWillMountName = null;
  var foundWillReceivePropsName = null;
  var foundWillUpdateName = null;
  if (typeof prototype.componentWillMount === 'function') {
    foundWillMountName = 'componentWillMount';
  } else if (typeof prototype.UNSAFE_componentWillMount === 'function') {
    foundWillMountName = 'UNSAFE_componentWillMount';
  }
  if (typeof prototype.componentWillReceiveProps === 'function') {
    foundWillReceivePropsName = 'componentWillReceiveProps';
  } else if (typeof prototype.UNSAFE_componentWillReceiveProps === 'function') {
    foundWillReceivePropsName = 'UNSAFE_componentWillReceiveProps';
  }
  if (typeof prototype.componentWillUpdate === 'function') {
    foundWillUpdateName = 'componentWillUpdate';
  } else if (typeof prototype.UNSAFE_componentWillUpdate === 'function') {
    foundWillUpdateName = 'UNSAFE_componentWillUpdate';
  }
  if (
    foundWillMountName !== null ||
    foundWillReceivePropsName !== null ||
    foundWillUpdateName !== null
  ) {
    var componentName = Component.displayName || Component.name;
    var newApiName =
      typeof Component.getDerivedStateFromProps === 'function'
        ? 'getDerivedStateFromProps()'
        : 'getSnapshotBeforeUpdate()';

    throw Error(
      'Unsafe legacy lifecycles will not be called for components using new component APIs.\n\n' +
        componentName +
        ' uses ' +
        newApiName +
        ' but also contains the following legacy lifecycles:' +
        (foundWillMountName !== null ? '\n  ' + foundWillMountName : '') +
        (foundWillReceivePropsName !== null
          ? '\n  ' + foundWillReceivePropsName
          : '') +
        (foundWillUpdateName !== null ? '\n  ' + foundWillUpdateName : '') +
        '\n\nThe above lifecycles should be removed. Learn more about this warning here:\n' +
        'https://fb.me/react-async-component-lifecycle-hooks'
    );
  }

  // React <= 16.2 does not support static getDerivedStateFromProps.
  // As a workaround, use cWM and cWRP to invoke the new static lifecycle.
  // Newer versions of React will ignore these lifecycles if gDSFP exists.
  if (typeof Component.getDerivedStateFromProps === 'function') {
    prototype.componentWillMount = componentWillMount;
    prototype.componentWillReceiveProps = componentWillReceiveProps;
  }

  // React <= 16.2 does not support getSnapshotBeforeUpdate.
  // As a workaround, use cWU to invoke the new lifecycle.
  // Newer versions of React will ignore that lifecycle if gSBU exists.
  if (typeof prototype.getSnapshotBeforeUpdate === 'function') {
    if (typeof prototype.componentDidUpdate !== 'function') {
      throw new Error(
        'Cannot polyfill getSnapshotBeforeUpdate() for components that do not define componentDidUpdate() on the prototype'
      );
    }

    prototype.componentWillUpdate = componentWillUpdate;

    var componentDidUpdate = prototype.componentDidUpdate;

    prototype.componentDidUpdate = function componentDidUpdatePolyfill(
      prevProps,
      prevState,
      maybeSnapshot
    ) {
      // 16.3+ will not execute our will-update method;
      // It will pass a snapshot value to did-update though.
      // Older versions will require our polyfilled will-update value.
      // We need to handle both cases, but can't just check for the presence of "maybeSnapshot",
      // Because for <= 15.x versions this might be a "prevContext" object.
      // We also can't just check "__reactInternalSnapshot",
      // Because get-snapshot might return a falsy value.
      // So check for the explicit __reactInternalSnapshotFlag flag to determine behavior.
      var snapshot = this.__reactInternalSnapshotFlag
        ? this.__reactInternalSnapshot
        : maybeSnapshot;

      componentDidUpdate.call(this, prevProps, prevState, snapshot);
    };
  }

  return Component;
}

////////////////////////////////////////////////////////////////////////////////
// startsWith(string, search) - Check if `string` starts with `search`
var startsWith = function startsWith(string, search) {
  return string.substr(0, search.length) === search;
};

////////////////////////////////////////////////////////////////////////////////
// pick(routes, uri)
//
// Ranks and picks the best route to match. Each segment gets the highest
// amount of points, then the type of segment gets an additional amount of
// points where
//
//     static > dynamic > splat > root
//
// This way we don't have to worry about the order of our routes, let the
// computers do it.
//
// A route looks like this
//
//     { path, default, value }
//
// And a returned match looks like:
//
//     { route, params, uri }
//
// I know, I should use TypeScript not comments for these types.
var pick = function pick(routes, uri) {
  var match = void 0;
  var default_ = void 0;

  var _uri$split = uri.split("?"),
      uriPathname = _uri$split[0];

  var uriSegments = segmentize(uriPathname);
  var isRootUri = uriSegments[0] === "";
  var ranked = rankRoutes(routes);

  for (var i = 0, l = ranked.length; i < l; i++) {
    var missed = false;
    var route = ranked[i].route;

    if (route.default) {
      default_ = {
        route: route,
        params: {},
        uri: uri
      };
      continue;
    }

    var routeSegments = segmentize(route.path);
    var params = {};
    var max = Math.max(uriSegments.length, routeSegments.length);
    var index = 0;

    for (; index < max; index++) {
      var routeSegment = routeSegments[index];
      var uriSegment = uriSegments[index];

      var _isSplat = routeSegment === "*";
      if (_isSplat) {
        // Hit a splat, just grab the rest, and return a match
        // uri:   /files/documents/work
        // route: /files/*
        params["*"] = uriSegments.slice(index).map(decodeURIComponent).join("/");
        break;
      }

      if (uriSegment === undefined) {
        // URI is shorter than the route, no match
        // uri:   /users
        // route: /users/:userId
        missed = true;
        break;
      }

      var dynamicMatch = paramRe.exec(routeSegment);

      if (dynamicMatch && !isRootUri) {
        var matchIsNotReserved = reservedNames.indexOf(dynamicMatch[1]) === -1;
        !matchIsNotReserved ? invariant_1$1(false, "<Router> dynamic segment \"" + dynamicMatch[1] + "\" is a reserved name. Please use a different name in path \"" + route.path + "\".") : void 0;
        var value = decodeURIComponent(uriSegment);
        params[dynamicMatch[1]] = value;
      } else if (routeSegment !== uriSegment) {
        // Current segments don't match, not dynamic, not splat, so no match
        // uri:   /users/123/settings
        // route: /users/:id/profile
        missed = true;
        break;
      }
    }

    if (!missed) {
      match = {
        route: route,
        params: params,
        uri: "/" + uriSegments.slice(0, index).join("/")
      };
      break;
    }
  }

  return match || default_ || null;
};

////////////////////////////////////////////////////////////////////////////////
// match(path, uri) - Matches just one path to a uri, also lol
var match = function match(path, uri) {
  return pick([{ path: path }], uri);
};

////////////////////////////////////////////////////////////////////////////////
// resolve(to, basepath)
//
// Resolves URIs as though every path is a directory, no files.  Relative URIs
// in the browser can feel awkward because not only can you be "in a directory"
// you can be "at a file", too. For example
//
//     browserSpecResolve('foo', '/bar/') => /bar/foo
//     browserSpecResolve('foo', '/bar') => /foo
//
// But on the command line of a file system, it's not as complicated, you can't
// `cd` from a file, only directories.  This way, links have to know less about
// their current path. To go deeper you can do this:
//
//     <Link to="deeper"/>
//     // instead of
//     <Link to=`{${props.uri}/deeper}`/>
//
// Just like `cd`, if you want to go deeper from the command line, you do this:
//
//     cd deeper
//     # not
//     cd $(pwd)/deeper
//
// By treating every path as a directory, linking to relative paths should
// require less contextual information and (fingers crossed) be more intuitive.
var resolve = function resolve(to, base) {
  // /foo/bar, /baz/qux => /foo/bar
  if (startsWith(to, "/")) {
    return to;
  }

  var _to$split = to.split("?"),
      toPathname = _to$split[0],
      toQuery = _to$split[1];

  var _base$split = base.split("?"),
      basePathname = _base$split[0];

  var toSegments = segmentize(toPathname);
  var baseSegments = segmentize(basePathname);

  // ?a=b, /users?b=c => /users?a=b
  if (toSegments[0] === "") {
    return addQuery(basePathname, toQuery);
  }

  // profile, /users/789 => /users/789/profile
  if (!startsWith(toSegments[0], ".")) {
    var pathname = baseSegments.concat(toSegments).join("/");
    return addQuery((basePathname === "/" ? "" : "/") + pathname, toQuery);
  }

  // ./         /users/123  =>  /users/123
  // ../        /users/123  =>  /users
  // ../..      /users/123  =>  /
  // ../../one  /a/b/c/d    =>  /a/b/one
  // .././one   /a/b/c/d    =>  /a/b/c/one
  var allSegments = baseSegments.concat(toSegments);
  var segments = [];
  for (var i = 0, l = allSegments.length; i < l; i++) {
    var segment = allSegments[i];
    if (segment === "..") segments.pop();else if (segment !== ".") segments.push(segment);
  }

  return addQuery("/" + segments.join("/"), toQuery);
};

////////////////////////////////////////////////////////////////////////////////
// insertParams(path, params)
var insertParams = function insertParams(path, params) {
  var segments = segmentize(path);
  return "/" + segments.map(function (segment) {
    var match = paramRe.exec(segment);
    return match ? params[match[1]] : segment;
  }).join("/");
};

var validateRedirect = function validateRedirect(from, to) {
  var filter = function filter(segment) {
    return isDynamic(segment);
  };
  var fromString = segmentize(from).filter(filter).sort().join("/");
  var toString = segmentize(to).filter(filter).sort().join("/");
  return fromString === toString;
};

////////////////////////////////////////////////////////////////////////////////
// Junk
var paramRe = /^:(.+)/;

var SEGMENT_POINTS = 4;
var STATIC_POINTS = 3;
var DYNAMIC_POINTS = 2;
var SPLAT_PENALTY = 1;
var ROOT_POINTS = 1;

var isRootSegment = function isRootSegment(segment) {
  return segment === "";
};
var isDynamic = function isDynamic(segment) {
  return paramRe.test(segment);
};
var isSplat = function isSplat(segment) {
  return segment === "*";
};

var rankRoute = function rankRoute(route, index) {
  var score = route.default ? 0 : segmentize(route.path).reduce(function (score, segment) {
    score += SEGMENT_POINTS;
    if (isRootSegment(segment)) score += ROOT_POINTS;else if (isDynamic(segment)) score += DYNAMIC_POINTS;else if (isSplat(segment)) score -= SEGMENT_POINTS + SPLAT_PENALTY;else score += STATIC_POINTS;
    return score;
  }, 0);
  return { route: route, score: score, index: index };
};

var rankRoutes = function rankRoutes(routes) {
  return routes.map(rankRoute).sort(function (a, b) {
    return a.score < b.score ? 1 : a.score > b.score ? -1 : a.index - b.index;
  });
};

var segmentize = function segmentize(uri) {
  return uri
  // strip starting/ending slashes
  .replace(/(^\/+|\/+$)/g, "").split("/");
};

var addQuery = function addQuery(pathname, query) {
  return pathname + (query ? "?" + query : "");
};

var reservedNames = ["uri", "path"];

var classCallCheck = function (instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
};

var _extends = Object.assign || function (target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i];

    for (var key in source) {
      if (Object.prototype.hasOwnProperty.call(source, key)) {
        target[key] = source[key];
      }
    }
  }

  return target;
};

var inherits = function (subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
};

var objectWithoutProperties = function (obj, keys) {
  var target = {};

  for (var i in obj) {
    if (keys.indexOf(i) >= 0) continue;
    if (!Object.prototype.hasOwnProperty.call(obj, i)) continue;
    target[i] = obj[i];
  }

  return target;
};

var possibleConstructorReturn = function (self, call) {
  if (!self) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return call && (typeof call === "object" || typeof call === "function") ? call : self;
};

var getLocation = function getLocation(source) {
  return _extends({}, source.location, {
    state: source.history.state,
    key: source.history.state && source.history.state.key || "initial"
  });
};

var createHistory = function createHistory(source, options) {
  var listeners = [];
  var location = getLocation(source);
  var transitioning = false;
  var resolveTransition = function resolveTransition() {};

  return {
    get location() {
      return location;
    },

    get transitioning() {
      return transitioning;
    },

    _onTransitionComplete: function _onTransitionComplete() {
      transitioning = false;
      resolveTransition();
    },
    listen: function listen(listener) {
      listeners.push(listener);

      var popstateListener = function popstateListener() {
        location = getLocation(source);
        listener({ location: location, action: "POP" });
      };

      source.addEventListener("popstate", popstateListener);

      return function () {
        source.removeEventListener("popstate", popstateListener);
        listeners = listeners.filter(function (fn) {
          return fn !== listener;
        });
      };
    },
    navigate: function navigate(to) {
      var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
          state = _ref.state,
          _ref$replace = _ref.replace,
          replace = _ref$replace === undefined ? false : _ref$replace;

      state = _extends({}, state, { key: Date.now() + "" });
      // try...catch iOS Safari limits to 100 pushState calls
      try {
        if (transitioning || replace) {
          source.history.replaceState(state, null, to);
        } else {
          source.history.pushState(state, null, to);
        }
      } catch (e) {
        source.location[replace ? "replace" : "assign"](to);
      }

      location = getLocation(source);
      transitioning = true;
      var transition = new Promise(function (res) {
        return resolveTransition = res;
      });
      listeners.forEach(function (listener) {
        return listener({ location: location, action: "PUSH" });
      });
      return transition;
    }
  };
};

////////////////////////////////////////////////////////////////////////////////
// Stores history entries in memory for testing or other platforms like Native
var createMemorySource = function createMemorySource() {
  var initialPathname = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : "/";

  var index = 0;
  var stack = [{ pathname: initialPathname, search: "" }];
  var states = [];

  return {
    get location() {
      return stack[index];
    },
    addEventListener: function addEventListener(name, fn) {},
    removeEventListener: function removeEventListener(name, fn) {},

    history: {
      get entries() {
        return stack;
      },
      get index() {
        return index;
      },
      get state() {
        return states[index];
      },
      pushState: function pushState(state, _, uri) {
        var _uri$split = uri.split("?"),
            pathname = _uri$split[0],
            _uri$split$ = _uri$split[1],
            search = _uri$split$ === undefined ? "" : _uri$split$;

        index++;
        stack.push({ pathname: pathname, search: search });
        states.push(state);
      },
      replaceState: function replaceState(state, _, uri) {
        var _uri$split2 = uri.split("?"),
            pathname = _uri$split2[0],
            _uri$split2$ = _uri$split2[1],
            search = _uri$split2$ === undefined ? "" : _uri$split2$;

        stack[index] = { pathname: pathname, search: search };
        states[index] = state;
      }
    }
  };
};

////////////////////////////////////////////////////////////////////////////////
// global history - uses window.history as the source if available, otherwise a
// memory history
var canUseDOM = !!(typeof window !== "undefined" && window.document && window.document.createElement);
var getSource = function getSource() {
  return canUseDOM ? window : createMemorySource();
};

var globalHistory = createHistory(getSource());
var navigate = globalHistory.navigate;

/* eslint-disable jsx-a11y/anchor-has-content */

////////////////////////////////////////////////////////////////////////////////

var createNamedContext = function createNamedContext(name, defaultValue) {
  var Ctx = createContext(defaultValue);
  Ctx.Consumer.displayName = name + ".Consumer";
  Ctx.Provider.displayName = name + ".Provider";
  return Ctx;
};

////////////////////////////////////////////////////////////////////////////////
// Location Context/Provider
var LocationContext = createNamedContext("Location");

// sets up a listener if there isn't one already so apps don't need to be
// wrapped in some top level provider
var Location = function Location(_ref) {
  var children = _ref.children;
  return React.createElement(
    LocationContext.Consumer,
    null,
    function (context) {
      return context ? children(context) : React.createElement(
        LocationProvider,
        null,
        children
      );
    }
  );
};

var LocationProvider = function (_React$Component) {
  inherits(LocationProvider, _React$Component);

  function LocationProvider() {
    var _temp, _this, _ret;

    classCallCheck(this, LocationProvider);

    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    return _ret = (_temp = (_this = possibleConstructorReturn(this, _React$Component.call.apply(_React$Component, [this].concat(args))), _this), _this.state = {
      context: _this.getContext(),
      refs: { unlisten: null }
    }, _temp), possibleConstructorReturn(_this, _ret);
  }

  LocationProvider.prototype.getContext = function getContext() {
    var _props$history = this.props.history,
        navigate$$1 = _props$history.navigate,
        location = _props$history.location;

    return { navigate: navigate$$1, location: location };
  };

  LocationProvider.prototype.componentDidCatch = function componentDidCatch(error, info) {
    if (isRedirect(error)) {
      var _navigate = this.props.history.navigate;

      _navigate(error.uri, { replace: true });
    } else {
      throw error;
    }
  };

  LocationProvider.prototype.componentDidUpdate = function componentDidUpdate(prevProps, prevState) {
    if (prevState.context.location !== this.state.context.location) {
      this.props.history._onTransitionComplete();
    }
  };

  LocationProvider.prototype.componentDidMount = function componentDidMount() {
    var _this2 = this;

    var refs = this.state.refs,
        history = this.props.history;

    refs.unlisten = history.listen(function () {
      Promise.resolve().then(function () {
        // TODO: replace rAF with react deferred update API when it's ready https://github.com/facebook/react/issues/13306
        requestAnimationFrame(function () {
          if (!_this2.unmounted) {
            _this2.setState(function () {
              return { context: _this2.getContext() };
            });
          }
        });
      });
    });
  };

  LocationProvider.prototype.componentWillUnmount = function componentWillUnmount() {
    var refs = this.state.refs;

    this.unmounted = true;
    refs.unlisten();
  };

  LocationProvider.prototype.render = function render() {
    var context = this.state.context,
        children = this.props.children;

    return React.createElement(
      LocationContext.Provider,
      { value: context },
      typeof children === "function" ? children(context) : children || null
    );
  };

  return LocationProvider;
}(React.Component);

////////////////////////////////////////////////////////////////////////////////


LocationProvider.defaultProps = {
  history: globalHistory
};
LocationProvider.propTypes = {
  history: propTypes.object.isRequired
};
var ServerLocation = function ServerLocation(_ref2) {
  var url = _ref2.url,
      children = _ref2.children;
  return React.createElement(
    LocationContext.Provider,
    {
      value: {
        location: {
          pathname: url,
          search: "",
          hash: ""
        },
        navigate: function navigate$$1() {
          throw new Error("You can't call navigate on the server.");
        }
      }
    },
    children
  );
};

////////////////////////////////////////////////////////////////////////////////
// Sets baseuri and basepath for nested routers and links
var BaseContext = createNamedContext("Base", { baseuri: "/", basepath: "/" });

////////////////////////////////////////////////////////////////////////////////
// The main event, welcome to the show everybody.
var Router = function Router(props) {
  return React.createElement(
    BaseContext.Consumer,
    null,
    function (baseContext) {
      return React.createElement(
        Location,
        null,
        function (locationContext) {
          return React.createElement(RouterImpl, _extends({}, baseContext, locationContext, props));
        }
      );
    }
  );
};

var RouterImpl = function (_React$PureComponent) {
  inherits(RouterImpl, _React$PureComponent);

  function RouterImpl() {
    classCallCheck(this, RouterImpl);
    return possibleConstructorReturn(this, _React$PureComponent.apply(this, arguments));
  }

  RouterImpl.prototype.render = function render() {
    var _props = this.props,
        location = _props.location,
        _navigate2 = _props.navigate,
        basepath = _props.basepath,
        primary = _props.primary,
        children = _props.children,
        baseuri = _props.baseuri,
        _props$component = _props.component,
        component = _props$component === undefined ? "div" : _props$component,
        domProps = objectWithoutProperties(_props, ["location", "navigate", "basepath", "primary", "children", "baseuri", "component"]);

    var routes = React.Children.map(children, createRoute(basepath));
    var pathname = location.pathname;


    var match$$1 = pick(routes, pathname);

    if (match$$1) {
      var params = match$$1.params,
          uri = match$$1.uri,
          route = match$$1.route,
          element = match$$1.route.value;

      // remove the /* from the end for child routes relative paths

      basepath = route.default ? basepath : route.path.replace(/\*$/, "");

      var props = _extends({}, params, {
        uri: uri,
        location: location,
        navigate: function navigate$$1(to, options) {
          return _navigate2(resolve(to, uri), options);
        }
      });

      var clone = React.cloneElement(element, props, element.props.children ? React.createElement(
        Router,
        { primary: primary },
        element.props.children
      ) : undefined);

      // using 'div' for < 16.3 support
      var FocusWrapper = primary ? FocusHandler : component;
      // don't pass any props to 'div'
      var wrapperProps = primary ? _extends({ uri: uri, location: location, component: component }, domProps) : domProps;

      return React.createElement(
        BaseContext.Provider,
        { value: { baseuri: uri, basepath: basepath } },
        React.createElement(
          FocusWrapper,
          wrapperProps,
          clone
        )
      );
    } else {
      // Not sure if we want this, would require index routes at every level
      // warning(
      //   false,
      //   `<Router basepath="${basepath}">\n\nNothing matched:\n\t${
      //     location.pathname
      //   }\n\nPaths checked: \n\t${routes
      //     .map(route => route.path)
      //     .join(
      //       "\n\t"
      //     )}\n\nTo get rid of this warning, add a default NotFound component as child of Router:
      //   \n\tlet NotFound = () => <div>Not Found!</div>
      //   \n\t<Router>\n\t  <NotFound default/>\n\t  {/* ... */}\n\t</Router>`
      // );
      return null;
    }
  };

  return RouterImpl;
}(React.PureComponent);

RouterImpl.defaultProps = {
  primary: true
};


var FocusContext = createNamedContext("Focus");

var FocusHandler = function FocusHandler(_ref3) {
  var uri = _ref3.uri,
      location = _ref3.location,
      component = _ref3.component,
      domProps = objectWithoutProperties(_ref3, ["uri", "location", "component"]);
  return React.createElement(
    FocusContext.Consumer,
    null,
    function (requestFocus) {
      return React.createElement(FocusHandlerImpl, _extends({}, domProps, {
        component: component,
        requestFocus: requestFocus,
        uri: uri,
        location: location
      }));
    }
  );
};

// don't focus on initial render
var initialRender = true;
var focusHandlerCount = 0;

var FocusHandlerImpl = function (_React$Component2) {
  inherits(FocusHandlerImpl, _React$Component2);

  function FocusHandlerImpl() {
    var _temp2, _this4, _ret2;

    classCallCheck(this, FocusHandlerImpl);

    for (var _len2 = arguments.length, args = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
      args[_key2] = arguments[_key2];
    }

    return _ret2 = (_temp2 = (_this4 = possibleConstructorReturn(this, _React$Component2.call.apply(_React$Component2, [this].concat(args))), _this4), _this4.state = {}, _this4.requestFocus = function (node) {
      if (!_this4.state.shouldFocus) {
        node.focus();
      }
    }, _temp2), possibleConstructorReturn(_this4, _ret2);
  }

  FocusHandlerImpl.getDerivedStateFromProps = function getDerivedStateFromProps(nextProps, prevState) {
    var initial = prevState.uri == null;
    if (initial) {
      return _extends({
        shouldFocus: true
      }, nextProps);
    } else {
      var myURIChanged = nextProps.uri !== prevState.uri;
      var navigatedUpToMe = prevState.location.pathname !== nextProps.location.pathname && nextProps.location.pathname === nextProps.uri;
      return _extends({
        shouldFocus: myURIChanged || navigatedUpToMe
      }, nextProps);
    }
  };

  FocusHandlerImpl.prototype.componentDidMount = function componentDidMount() {
    focusHandlerCount++;
    this.focus();
  };

  FocusHandlerImpl.prototype.componentWillUnmount = function componentWillUnmount() {
    focusHandlerCount--;
    if (focusHandlerCount === 0) {
      initialRender = true;
    }
  };

  FocusHandlerImpl.prototype.componentDidUpdate = function componentDidUpdate(prevProps, prevState) {
    if (prevProps.location !== this.props.location && this.state.shouldFocus) {
      this.focus();
    }
  };

  FocusHandlerImpl.prototype.focus = function focus() {

    var requestFocus = this.props.requestFocus;


    if (requestFocus) {
      requestFocus(this.node);
    } else {
      if (initialRender) {
        initialRender = false;
      } else {
        // React polyfills [autofocus] and it fires earlier than cDM,
        // so we were stealing focus away, this line prevents that.
        if (!this.node.contains(document.activeElement)) {
          this.node.focus();
        }
      }
    }
  };

  FocusHandlerImpl.prototype.render = function render() {
    var _this5 = this;

    var _props2 = this.props,
        children = _props2.children,
        style = _props2.style,
        requestFocus = _props2.requestFocus,
        _props2$role = _props2.role,
        role = _props2$role === undefined ? "group" : _props2$role,
        _props2$component = _props2.component,
        Comp = _props2$component === undefined ? "div" : _props2$component,
        uri = _props2.uri,
        location = _props2.location,
        domProps = objectWithoutProperties(_props2, ["children", "style", "requestFocus", "role", "component", "uri", "location"]);

    return React.createElement(
      Comp,
      _extends({
        style: _extends({ outline: "none" }, style),
        tabIndex: "-1",
        role: role,
        ref: function ref(n) {
          return _this5.node = n;
        }
      }, domProps),
      React.createElement(
        FocusContext.Provider,
        { value: this.requestFocus },
        this.props.children
      )
    );
  };

  return FocusHandlerImpl;
}(React.Component);

polyfill(FocusHandlerImpl);

var k = function k() {};

////////////////////////////////////////////////////////////////////////////////
var forwardRef = React.forwardRef;

if (typeof forwardRef === "undefined") {
  forwardRef = function forwardRef(C) {
    return C;
  };
}

var Link = forwardRef(function (_ref4, ref) {
  var innerRef = _ref4.innerRef,
      props = objectWithoutProperties(_ref4, ["innerRef"]);
  return React.createElement(
    BaseContext.Consumer,
    null,
    function (_ref5) {
      var basepath = _ref5.basepath,
          baseuri = _ref5.baseuri;
      return React.createElement(
        Location,
        null,
        function (_ref6) {
          var location = _ref6.location,
              navigate$$1 = _ref6.navigate;
          var to = props.to,
              state = props.state,
              replace = props.replace,
              _props$getProps = props.getProps,
              getProps = _props$getProps === undefined ? k : _props$getProps,
              anchorProps = objectWithoutProperties(props, ["to", "state", "replace", "getProps"]);

          var href = resolve(to, baseuri);
          var isCurrent = location.pathname === href;
          var isPartiallyCurrent = startsWith(location.pathname, href);

          return React.createElement("a", _extends({
            ref: ref || innerRef,
            "aria-current": isCurrent ? "page" : undefined
          }, anchorProps, getProps({ isCurrent: isCurrent, isPartiallyCurrent: isPartiallyCurrent, href: href, location: location }), {
            href: href,
            onClick: function onClick(event) {
              if (anchorProps.onClick) anchorProps.onClick(event);
              if (shouldNavigate(event)) {
                event.preventDefault();
                navigate$$1(href, { state: state, replace: replace });
              }
            }
          }));
        }
      );
    }
  );
});

////////////////////////////////////////////////////////////////////////////////
function RedirectRequest(uri) {
  this.uri = uri;
}

var isRedirect = function isRedirect(o) {
  return o instanceof RedirectRequest;
};

var redirectTo = function redirectTo(to) {
  throw new RedirectRequest(to);
};

var RedirectImpl = function (_React$Component3) {
  inherits(RedirectImpl, _React$Component3);

  function RedirectImpl() {
    classCallCheck(this, RedirectImpl);
    return possibleConstructorReturn(this, _React$Component3.apply(this, arguments));
  }

  // Support React < 16 with this hook
  RedirectImpl.prototype.componentDidMount = function componentDidMount() {
    var _props3 = this.props,
        navigate$$1 = _props3.navigate,
        to = _props3.to,
        from = _props3.from,
        _props3$replace = _props3.replace,
        replace = _props3$replace === undefined ? true : _props3$replace,
        state = _props3.state,
        noThrow = _props3.noThrow,
        props = objectWithoutProperties(_props3, ["navigate", "to", "from", "replace", "state", "noThrow"]);

    Promise.resolve().then(function () {
      navigate$$1(insertParams(to, props), { replace: replace, state: state });
    });
  };

  RedirectImpl.prototype.render = function render() {
    var _props4 = this.props,
        navigate$$1 = _props4.navigate,
        to = _props4.to,
        from = _props4.from,
        replace = _props4.replace,
        state = _props4.state,
        noThrow = _props4.noThrow,
        props = objectWithoutProperties(_props4, ["navigate", "to", "from", "replace", "state", "noThrow"]);

    if (!noThrow) redirectTo(insertParams(to, props));
    return null;
  };

  return RedirectImpl;
}(React.Component);

var Redirect = function Redirect(props) {
  return React.createElement(
    Location,
    null,
    function (locationContext) {
      return React.createElement(RedirectImpl, _extends({}, locationContext, props));
    }
  );
};

Redirect.propTypes = {
  from: propTypes.string,
  to: propTypes.string.isRequired
};

////////////////////////////////////////////////////////////////////////////////
var Match = function Match(_ref7) {
  var path = _ref7.path,
      children = _ref7.children;
  return React.createElement(
    BaseContext.Consumer,
    null,
    function (_ref8) {
      var baseuri = _ref8.baseuri;
      return React.createElement(
        Location,
        null,
        function (_ref9) {
          var navigate$$1 = _ref9.navigate,
              location = _ref9.location;

          var resolvedPath = resolve(path, baseuri);
          var result = match(resolvedPath, location.pathname);
          return children({
            navigate: navigate$$1,
            location: location,
            match: result ? _extends({}, result.params, {
              uri: result.uri,
              path: path
            }) : null
          });
        }
      );
    }
  );
};

////////////////////////////////////////////////////////////////////////////////
// Junk
var stripSlashes = function stripSlashes(str) {
  return str.replace(/(^\/+|\/+$)/g, "");
};

var createRoute = function createRoute(basepath) {
  return function (element) {
    if (!element) {
      return null;
    }

    !(element.props.path || element.props.default || element.type === Redirect) ? invariant_1$1(false, "<Router>: Children of <Router> must have a `path` or `default` prop, or be a `<Redirect>`. None found on element type `" + element.type + "`") : void 0;

    !!(element.type === Redirect && (!element.props.from || !element.props.to)) ? invariant_1$1(false, "<Redirect from=\"" + element.props.from + " to=\"" + element.props.to + "\"/> requires both \"from\" and \"to\" props when inside a <Router>.") : void 0;

    !!(element.type === Redirect && !validateRedirect(element.props.from, element.props.to)) ? invariant_1$1(false, "<Redirect from=\"" + element.props.from + " to=\"" + element.props.to + "\"/> has mismatched dynamic segments, ensure both paths have the exact same dynamic segments.") : void 0;

    if (element.props.default) {
      return { value: element, default: true };
    }

    var elementPath = element.type === Redirect ? element.props.from : element.props.path;

    var path = elementPath === "/" ? basepath : stripSlashes(basepath) + "/" + stripSlashes(elementPath);

    return {
      value: element,
      default: element.props.default,
      path: element.props.children ? stripSlashes(path) + "/*" : path
    };
  };
};

var shouldNavigate = function shouldNavigate(event) {
  return !event.defaultPrevented && event.button === 0 && !(event.metaKey || event.altKey || event.ctrlKey || event.shiftKey);
};

exports.Link = Link;
exports.Location = Location;
exports.LocationProvider = LocationProvider;
exports.Match = Match;
exports.Redirect = Redirect;
exports.Router = Router;
exports.ServerLocation = ServerLocation;
exports.createHistory = createHistory;
exports.createMemorySource = createMemorySource;
exports.isRedirect = isRedirect;
exports.navigate = navigate;
exports.redirectTo = redirectTo;
exports.globalHistory = globalHistory;

Object.defineProperty(exports, '__esModule', { value: true });

})));