react-art/umd/react-art.development.js

React ART is a JavaScript library for drawing vector graphics using React. It provides declarative and reactive bindings to the ART library. Using the same declarative API you can render the output to either Canvas, SVG or VML (IE8).

/** @license React v16.7.0
 * react-art.development.js
 *
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

'use strict';

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

var ReactInternals = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

var _assign = ReactInternals.assign;

// TODO: this is special because it gets imported during build.

var ReactVersion = '16.7.0';

/**
 * 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 = function (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 = void 0;
    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;
  }
}

// Relying on the `invariant()` implementation lets us
// preserve the format and params in the www builds.

/**
 * 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 warningWithoutStack = function () {};

{
  warningWithoutStack = function (condition, format) {
    for (var _len = arguments.length, args = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
      args[_key - 2] = arguments[_key];
    }

    if (format === undefined) {
      throw new Error('`warningWithoutStack(condition, format, ...args)` requires a warning ' + 'message argument');
    }
    if (args.length > 8) {
      // Check before the condition to catch violations early.
      throw new Error('warningWithoutStack() currently supports at most 8 arguments.');
    }
    if (condition) {
      return;
    }
    if (typeof console !== 'undefined') {
      var argsWithFormat = args.map(function (item) {
        return '' + item;
      });
      argsWithFormat.unshift('Warning: ' + format);

      // We intentionally don't use spread (or .apply) directly because it
      // breaks IE9: https://github.com/facebook/react/issues/13610
      Function.prototype.apply.call(console.error, console, argsWithFormat);
    }
    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.
      var argIndex = 0;
      var message = 'Warning: ' + format.replace(/%s/g, function () {
        return args[argIndex++];
      });
      throw new Error(message);
    } catch (x) {}
  };
}

var warningWithoutStack$1 = warningWithoutStack;

/**
 * `ReactInstanceMap` maintains a mapping from a public facing stateful
 * instance (key) and the internal representation (value). This allows public
 * methods to accept the user facing instance as an argument and map them back
 * to internal methods.
 *
 * Note that this module is currently shared and assumed to be stateless.
 * If this becomes an actual Map, that will break.
 */

/**
 * This API should be called `delete` but we'd have to make sure to always
 * transform these to strings for IE support. When this transform is fully
 * supported we can rename it.
 */


function get(key) {
  return key._reactInternalFiber;
}



function set(key, value) {
  key._reactInternalFiber = value;
}

var ReactSharedInternals = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

// The Symbol used to tag the ReactElement-like types. If there is no native Symbol
// nor polyfill, then a plain number is used for performance.
var hasSymbol = typeof Symbol === 'function' && Symbol.for;

var REACT_ELEMENT_TYPE = hasSymbol ? Symbol.for('react.element') : 0xeac7;
var REACT_PORTAL_TYPE = hasSymbol ? Symbol.for('react.portal') : 0xeaca;
var REACT_FRAGMENT_TYPE = hasSymbol ? Symbol.for('react.fragment') : 0xeacb;
var REACT_STRICT_MODE_TYPE = hasSymbol ? Symbol.for('react.strict_mode') : 0xeacc;
var REACT_PROFILER_TYPE = hasSymbol ? Symbol.for('react.profiler') : 0xead2;
var REACT_PROVIDER_TYPE = hasSymbol ? Symbol.for('react.provider') : 0xeacd;
var REACT_CONTEXT_TYPE = hasSymbol ? Symbol.for('react.context') : 0xeace;

var REACT_CONCURRENT_MODE_TYPE = hasSymbol ? Symbol.for('react.concurrent_mode') : 0xeacf;
var REACT_FORWARD_REF_TYPE = hasSymbol ? Symbol.for('react.forward_ref') : 0xead0;
var REACT_SUSPENSE_TYPE = hasSymbol ? Symbol.for('react.suspense') : 0xead1;
var REACT_MEMO_TYPE = hasSymbol ? Symbol.for('react.memo') : 0xead3;
var REACT_LAZY_TYPE = hasSymbol ? Symbol.for('react.lazy') : 0xead4;

var MAYBE_ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
var FAUX_ITERATOR_SYMBOL = '@@iterator';

function getIteratorFn(maybeIterable) {
  if (maybeIterable === null || typeof maybeIterable !== 'object') {
    return null;
  }
  var maybeIterator = MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL];
  if (typeof maybeIterator === 'function') {
    return maybeIterator;
  }
  return null;
}

var Pending = 0;
var Resolved = 1;
var Rejected = 2;

function refineResolvedLazyComponent(lazyComponent) {
  return lazyComponent._status === Resolved ? lazyComponent._result : null;
}

function getWrappedName(outerType, innerType, wrapperName) {
  var functionName = innerType.displayName || innerType.name || '';
  return outerType.displayName || (functionName !== '' ? wrapperName + '(' + functionName + ')' : wrapperName);
}

function getComponentName(type) {
  if (type == null) {
    // Host root, text node or just invalid type.
    return null;
  }
  {
    if (typeof type.tag === 'number') {
      warningWithoutStack$1(false, 'Received an unexpected object in getComponentName(). ' + 'This is likely a bug in React. Please file an issue.');
    }
  }
  if (typeof type === 'function') {
    return type.displayName || type.name || null;
  }
  if (typeof type === 'string') {
    return type;
  }
  switch (type) {
    case REACT_CONCURRENT_MODE_TYPE:
      return 'ConcurrentMode';
    case REACT_FRAGMENT_TYPE:
      return 'Fragment';
    case REACT_PORTAL_TYPE:
      return 'Portal';
    case REACT_PROFILER_TYPE:
      return 'Profiler';
    case REACT_STRICT_MODE_TYPE:
      return 'StrictMode';
    case REACT_SUSPENSE_TYPE:
      return 'Suspense';
  }
  if (typeof type === 'object') {
    switch (type.$$typeof) {
      case REACT_CONTEXT_TYPE:
        return 'Context.Consumer';
      case REACT_PROVIDER_TYPE:
        return 'Context.Provider';
      case REACT_FORWARD_REF_TYPE:
        return getWrappedName(type, type.render, 'ForwardRef');
      case REACT_MEMO_TYPE:
        return getComponentName(type.type);
      case REACT_LAZY_TYPE:
        {
          var thenable = type;
          var resolvedThenable = refineResolvedLazyComponent(thenable);
          if (resolvedThenable) {
            return getComponentName(resolvedThenable);
          }
        }
    }
  }
  return null;
}

var FunctionComponent = 0;
var ClassComponent = 1;
var IndeterminateComponent = 2; // Before we know whether it is function or class
var HostRoot = 3; // Root of a host tree. Could be nested inside another node.
var HostPortal = 4; // A subtree. Could be an entry point to a different renderer.
var HostComponent = 5;
var HostText = 6;
var Fragment = 7;
var Mode = 8;
var ContextConsumer = 9;
var ContextProvider = 10;
var ForwardRef = 11;
var Profiler = 12;
var SuspenseComponent = 13;
var MemoComponent = 14;
var SimpleMemoComponent = 15;
var LazyComponent = 16;
var IncompleteClassComponent = 17;

// Don't change these two values. They're used by React Dev Tools.
var NoEffect = /*              */0;
var PerformedWork = /*         */1;

// You can change the rest (and add more).
var Placement = /*             */2;
var Update = /*                */4;
var PlacementAndUpdate = /*    */6;
var Deletion = /*              */8;
var ContentReset = /*          */16;
var Callback = /*              */32;
var DidCapture = /*            */64;
var Ref = /*                   */128;
var Snapshot = /*              */256;
var Passive = /*               */512;

// Passive & Update & Callback & Ref & Snapshot
var LifecycleEffectMask = /*   */932;

// Union of all host effects
var HostEffectMask = /*        */1023;

var Incomplete = /*            */1024;
var ShouldCapture = /*         */2048;

var ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;

var MOUNTING = 1;
var MOUNTED = 2;
var UNMOUNTED = 3;

function isFiberMountedImpl(fiber) {
  var node = fiber;
  if (!fiber.alternate) {
    // If there is no alternate, this might be a new tree that isn't inserted
    // yet. If it is, then it will have a pending insertion effect on it.
    if ((node.effectTag & Placement) !== NoEffect) {
      return MOUNTING;
    }
    while (node.return) {
      node = node.return;
      if ((node.effectTag & Placement) !== NoEffect) {
        return MOUNTING;
      }
    }
  } else {
    while (node.return) {
      node = node.return;
    }
  }
  if (node.tag === HostRoot) {
    // TODO: Check if this was a nested HostRoot when used with
    // renderContainerIntoSubtree.
    return MOUNTED;
  }
  // If we didn't hit the root, that means that we're in an disconnected tree
  // that has been unmounted.
  return UNMOUNTED;
}

function isFiberMounted(fiber) {
  return isFiberMountedImpl(fiber) === MOUNTED;
}

function isMounted(component) {
  {
    var owner = ReactCurrentOwner.current;
    if (owner !== null && owner.tag === ClassComponent) {
      var ownerFiber = owner;
      var instance = ownerFiber.stateNode;
      !instance._warnedAboutRefsInRender ? warningWithoutStack$1(false, '%s is accessing isMounted inside its render() function. ' + 'render() should be a pure function of props and state. It should ' + 'never access something that requires stale data from the previous ' + 'render, such as refs. Move this logic to componentDidMount and ' + 'componentDidUpdate instead.', getComponentName(ownerFiber.type) || 'A component') : void 0;
      instance._warnedAboutRefsInRender = true;
    }
  }

  var fiber = get(component);
  if (!fiber) {
    return false;
  }
  return isFiberMountedImpl(fiber) === MOUNTED;
}

function assertIsMounted(fiber) {
  !(isFiberMountedImpl(fiber) === MOUNTED) ? invariant(false, 'Unable to find node on an unmounted component.') : void 0;
}

function findCurrentFiberUsingSlowPath(fiber) {
  var alternate = fiber.alternate;
  if (!alternate) {
    // If there is no alternate, then we only need to check if it is mounted.
    var state = isFiberMountedImpl(fiber);
    !(state !== UNMOUNTED) ? invariant(false, 'Unable to find node on an unmounted component.') : void 0;
    if (state === MOUNTING) {
      return null;
    }
    return fiber;
  }
  // If we have two possible branches, we'll walk backwards up to the root
  // to see what path the root points to. On the way we may hit one of the
  // special cases and we'll deal with them.
  var a = fiber;
  var b = alternate;
  while (true) {
    var parentA = a.return;
    var parentB = parentA ? parentA.alternate : null;
    if (!parentA || !parentB) {
      // We're at the root.
      break;
    }

    // If both copies of the parent fiber point to the same child, we can
    // assume that the child is current. This happens when we bailout on low
    // priority: the bailed out fiber's child reuses the current child.
    if (parentA.child === parentB.child) {
      var child = parentA.child;
      while (child) {
        if (child === a) {
          // We've determined that A is the current branch.
          assertIsMounted(parentA);
          return fiber;
        }
        if (child === b) {
          // We've determined that B is the current branch.
          assertIsMounted(parentA);
          return alternate;
        }
        child = child.sibling;
      }
      // We should never have an alternate for any mounting node. So the only
      // way this could possibly happen is if this was unmounted, if at all.
      invariant(false, 'Unable to find node on an unmounted component.');
    }

    if (a.return !== b.return) {
      // The return pointer of A and the return pointer of B point to different
      // fibers. We assume that return pointers never criss-cross, so A must
      // belong to the child set of A.return, and B must belong to the child
      // set of B.return.
      a = parentA;
      b = parentB;
    } else {
      // The return pointers point to the same fiber. We'll have to use the
      // default, slow path: scan the child sets of each parent alternate to see
      // which child belongs to which set.
      //
      // Search parent A's child set
      var didFindChild = false;
      var _child = parentA.child;
      while (_child) {
        if (_child === a) {
          didFindChild = true;
          a = parentA;
          b = parentB;
          break;
        }
        if (_child === b) {
          didFindChild = true;
          b = parentA;
          a = parentB;
          break;
        }
        _child = _child.sibling;
      }
      if (!didFindChild) {
        // Search parent B's child set
        _child = parentB.child;
        while (_child) {
          if (_child === a) {
            didFindChild = true;
            a = parentB;
            b = parentA;
            break;
          }
          if (_child === b) {
            didFindChild = true;
            b = parentB;
            a = parentA;
            break;
          }
          _child = _child.sibling;
        }
        !didFindChild ? invariant(false, 'Child was not found in either parent set. This indicates a bug in React related to the return pointer. Please file an issue.') : void 0;
      }
    }

    !(a.alternate === b) ? invariant(false, 'Return fibers should always be each others\' alternates. This error is likely caused by a bug in React. Please file an issue.') : void 0;
  }
  // If the root is not a host container, we're in a disconnected tree. I.e.
  // unmounted.
  !(a.tag === HostRoot) ? invariant(false, 'Unable to find node on an unmounted component.') : void 0;
  if (a.stateNode.current === a) {
    // We've determined that A is the current branch.
    return fiber;
  }
  // Otherwise B has to be current branch.
  return alternate;
}

function findCurrentHostFiber(parent) {
  var currentParent = findCurrentFiberUsingSlowPath(parent);
  if (!currentParent) {
    return null;
  }

  // Next we'll drill down this component to find the first HostComponent/Text.
  var node = currentParent;
  while (true) {
    if (node.tag === HostComponent || node.tag === HostText) {
      return node;
    } else if (node.child) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === currentParent) {
      return null;
    }
    while (!node.sibling) {
      if (!node.return || node.return === currentParent) {
        return null;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
  // Flow needs the return null here, but ESLint complains about it.
  // eslint-disable-next-line no-unreachable
  return null;
}

var ReactInternals$1 = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

var _ReactInternals$Sched = ReactInternals$1.Scheduler;
var unstable_cancelCallback = _ReactInternals$Sched.unstable_cancelCallback;
var unstable_now = _ReactInternals$Sched.unstable_now;
var unstable_scheduleCallback = _ReactInternals$Sched.unstable_scheduleCallback;
var unstable_shouldYield = _ReactInternals$Sched.unstable_shouldYield;
var unstable_getFirstCallbackNode = _ReactInternals$Sched.unstable_getFirstCallbackNode;
var unstable_continueExecution = _ReactInternals$Sched.unstable_continueExecution;
var unstable_pauseExecution = _ReactInternals$Sched.unstable_pauseExecution;

var _class = function(mixins){
	var proto = {};
	for (var i = 0, l = arguments.length; i < l; i++){
		var mixin = arguments[i];
		if (typeof mixin == 'function') mixin = mixin.prototype;
		for (var key in mixin) proto[key] = mixin[key];
	}
	if (!proto.initialize) proto.initialize = function(){};
	proto.constructor = function(a,b,c,d,e,f,g,h){
		return new proto.initialize(a,b,c,d,e,f,g,h);
	};
	proto.constructor.prototype = proto.initialize.prototype = proto;
	return proto.constructor;
};

function Transform(xx, yx, xy, yy, x, y){
	if (xx && typeof xx == 'object'){
		yx = xx.yx; yy = xx.yy; y = xx.y;
		xy = xx.xy; x = xx.x; xx = xx.xx;
	}
	this.xx = xx == null ? 1 : xx;
	this.yx = yx || 0;
	this.xy = xy || 0;
	this.yy = yy == null ? 1 : yy;
	this.x = (x == null ? this.x : x) || 0;
	this.y = (y == null ? this.y : y) || 0;
	this._transform();
	return this;
}

var transform = _class({

	initialize: Transform,

	_transform: function(){},

	xx: 1, yx: 0, x: 0,
	xy: 0, yy: 1, y: 0,

	transform: function(xx, yx, xy, yy, x, y){
		var m = this;
		if (xx && typeof xx == 'object'){
			yx = xx.yx; yy = xx.yy; y = xx.y;
			xy = xx.xy; x = xx.x; xx = xx.xx;
		}
		if (!x) x = 0;
		if (!y) y = 0;
		return this.transformTo(
			m.xx * xx + m.xy * yx,
			m.yx * xx + m.yy * yx,
			m.xx * xy + m.xy * yy,
			m.yx * xy + m.yy * yy,
			m.xx * x + m.xy * y + m.x,
			m.yx * x + m.yy * y + m.y
		);
	},

	transformTo: Transform,

	translate: function(x, y){
		return this.transform(1, 0, 0, 1, x, y);
	},

	move: function(x, y){
		this.x += x || 0;
		this.y += y || 0;
		this._transform();
		return this;
	},

	scale: function(x, y){
		if (y == null) y = x;
		return this.transform(x, 0, 0, y, 0, 0);
	},

	rotate: function(deg, x, y){
		if (x == null || y == null){
			x = (this.left || 0) + (this.width || 0) / 2;
			y = (this.top || 0) + (this.height || 0) / 2;
		}

		var rad = deg * Math.PI / 180, sin = Math.sin(rad), cos = Math.cos(rad);

		this.transform(1, 0, 0, 1, x, y);
		var m = this;

		return this.transformTo(
			cos * m.xx - sin * m.yx,
			sin * m.xx + cos * m.yx,
			cos * m.xy - sin * m.yy,
			sin * m.xy + cos * m.yy,
			m.x,
			m.y
		).transform(1, 0, 0, 1, -x, -y);
	},

	moveTo: function(x, y){
		var m = this;
		return this.transformTo(m.xx, m.yx, m.xy, m.yy, x, y);
	},

	rotateTo: function(deg, x, y){
		var m = this;
		var flip = m.yx / m.xx > m.yy / m.xy ? -1 : 1;
		if (m.xx < 0 ? m.xy >= 0 : m.xy < 0) flip = -flip;
		return this.rotate(deg - Math.atan2(flip * m.yx, flip * m.xx) * 180 / Math.PI, x, y);
	},

	scaleTo: function(x, y){
		// Normalize
		var m = this;

		var h = Math.sqrt(m.xx * m.xx + m.yx * m.yx);
		m.xx /= h; m.yx /= h;

		h = Math.sqrt(m.yy * m.yy + m.xy * m.xy);
		m.yy /= h; m.xy /= h;

		return this.scale(x, y);
	},

	resizeTo: function(width, height){
		var w = this.width, h = this.height;
		if (!w || !h) return this;
		return this.scaleTo(width / w, height / h);
	},

	/*
	inverse: function(){
		var a = this.xx, b = this.yx,
			c = this.xy, d = this.yy,
			e = this.x, f = this.y;
		if (a * d - b * c == 0) return null;
		return new Transform(
			d/(a * d-b * c), b/(b * c-a * d),
			c/(b * c-a * d), a/(a * d-b * c),
			(d * e-c * f)/(b * c-a * d), (b * e-a * f)/(a * d-b * c)
		);
	},
	*/

	inversePoint: function(x, y){
		var a = this.xx, b = this.yx,
			c = this.xy, d = this.yy,
			e = this.x, f = this.y;
		var det = b * c - a * d;
		if (det == 0) return null;
		return {
			x: (d * (e - x) + c * (y - f)) / det,
			y: (a * (f - y) + b * (x - e)) / det
		};
	},

	point: function(x, y){
		var m = this;
		return {
			x: m.xx * x + m.xy * y + m.x,
			y: m.yx * x + m.yy * y + m.y
		};
	}	

});

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





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

var current = createCommonjsModule(function (module, exports) {
function warning(){
	throw new Error('You must require a mode before requiring anything else.');
}

exports.Surface = warning;
exports.Path = warning;
exports.Shape = warning;
exports.Group = warning;
exports.ClippingRectangle = warning;
exports.Text = warning;

exports.setCurrent = function(mode){
	for (var key in mode){
		exports[key] = mode[key];
	}
};
});

var current_1 = current.Surface;
var current_2 = current.Path;
var current_3 = current.Shape;
var current_4 = current.Group;
var current_5 = current.ClippingRectangle;
var current_6 = current.Text;
var current_7 = current.setCurrent;

var TYPES = {
  CLIPPING_RECTANGLE: 'ClippingRectangle',
  GROUP: 'Group',
  SHAPE: 'Shape',
  TEXT: 'Text'
};

var EVENT_TYPES = {
  onClick: 'click',
  onMouseMove: 'mousemove',
  onMouseOver: 'mouseover',
  onMouseOut: 'mouseout',
  onMouseUp: 'mouseup',
  onMouseDown: 'mousedown'
};

function childrenAsString(children) {
  if (!children) {
    return '';
  } else if (typeof children === 'string') {
    return children;
  } else if (children.length) {
    return children.join('');
  } else {
    return '';
  }
}

// Renderers that don't support persistence
// can re-export everything from this module.

function shim() {
  invariant(false, 'The current renderer does not support persistence. This error is likely caused by a bug in React. Please file an issue.');
}

// Persistence (when unsupported)
var supportsPersistence = false;
var cloneInstance = shim;
var createContainerChildSet = shim;
var appendChildToContainerChildSet = shim;
var finalizeContainerChildren = shim;
var replaceContainerChildren = shim;
var cloneHiddenInstance = shim;
var cloneUnhiddenInstance = shim;
var createHiddenTextInstance = shim;

// Renderers that don't support hydration
// can re-export everything from this module.

function shim$1() {
  invariant(false, 'The current renderer does not support hydration. This error is likely caused by a bug in React. Please file an issue.');
}

// Hydration (when unsupported)
var supportsHydration = false;
var canHydrateInstance = shim$1;
var canHydrateTextInstance = shim$1;
var getNextHydratableSibling = shim$1;
var getFirstHydratableChild = shim$1;
var hydrateInstance = shim$1;
var hydrateTextInstance = shim$1;
var didNotMatchHydratedContainerTextInstance = shim$1;
var didNotMatchHydratedTextInstance = shim$1;
var didNotHydrateContainerInstance = shim$1;
var didNotHydrateInstance = shim$1;
var didNotFindHydratableContainerInstance = shim$1;
var didNotFindHydratableContainerTextInstance = shim$1;
var didNotFindHydratableInstance = shim$1;
var didNotFindHydratableTextInstance = shim$1;

var pooledTransform = new transform();

var NO_CONTEXT = {};
var UPDATE_SIGNAL = {};
{
  Object.freeze(NO_CONTEXT);
  Object.freeze(UPDATE_SIGNAL);
}

/** Helper Methods */

function addEventListeners(instance, type, listener) {
  // We need to explicitly unregister before unmount.
  // For this reason we need to track subscriptions.
  if (!instance._listeners) {
    instance._listeners = {};
    instance._subscriptions = {};
  }

  instance._listeners[type] = listener;

  if (listener) {
    if (!instance._subscriptions[type]) {
      instance._subscriptions[type] = instance.subscribe(type, createEventHandler(instance), instance);
    }
  } else {
    if (instance._subscriptions[type]) {
      instance._subscriptions[type]();
      delete instance._subscriptions[type];
    }
  }
}

function createEventHandler(instance) {
  return function handleEvent(event) {
    var listener = instance._listeners[event.type];

    if (!listener) {
      // Noop
    } else if (typeof listener === 'function') {
      listener.call(instance, event);
    } else if (listener.handleEvent) {
      listener.handleEvent(event);
    }
  };
}

function destroyEventListeners(instance) {
  if (instance._subscriptions) {
    for (var type in instance._subscriptions) {
      instance._subscriptions[type]();
    }
  }

  instance._subscriptions = null;
  instance._listeners = null;
}

function getScaleX(props) {
  if (props.scaleX != null) {
    return props.scaleX;
  } else if (props.scale != null) {
    return props.scale;
  } else {
    return 1;
  }
}

function getScaleY(props) {
  if (props.scaleY != null) {
    return props.scaleY;
  } else if (props.scale != null) {
    return props.scale;
  } else {
    return 1;
  }
}

function isSameFont(oldFont, newFont) {
  if (oldFont === newFont) {
    return true;
  } else if (typeof newFont === 'string' || typeof oldFont === 'string') {
    return false;
  } else {
    return newFont.fontSize === oldFont.fontSize && newFont.fontStyle === oldFont.fontStyle && newFont.fontVariant === oldFont.fontVariant && newFont.fontWeight === oldFont.fontWeight && newFont.fontFamily === oldFont.fontFamily;
  }
}

/** Render Methods */

function applyClippingRectangleProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  applyNodeProps(instance, props, prevProps);

  instance.width = props.width;
  instance.height = props.height;
}

function applyGroupProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  applyNodeProps(instance, props, prevProps);

  instance.width = props.width;
  instance.height = props.height;
}

function applyNodeProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  var scaleX = getScaleX(props);
  var scaleY = getScaleY(props);

  pooledTransform.transformTo(1, 0, 0, 1, 0, 0).move(props.x || 0, props.y || 0).rotate(props.rotation || 0, props.originX, props.originY).scale(scaleX, scaleY, props.originX, props.originY);

  if (props.transform != null) {
    pooledTransform.transform(props.transform);
  }

  if (instance.xx !== pooledTransform.xx || instance.yx !== pooledTransform.yx || instance.xy !== pooledTransform.xy || instance.yy !== pooledTransform.yy || instance.x !== pooledTransform.x || instance.y !== pooledTransform.y) {
    instance.transformTo(pooledTransform);
  }

  if (props.cursor !== prevProps.cursor || props.title !== prevProps.title) {
    instance.indicate(props.cursor, props.title);
  }

  if (instance.blend && props.opacity !== prevProps.opacity) {
    instance.blend(props.opacity == null ? 1 : props.opacity);
  }

  if (props.visible !== prevProps.visible) {
    if (props.visible == null || props.visible) {
      instance.show();
    } else {
      instance.hide();
    }
  }

  for (var type in EVENT_TYPES) {
    addEventListeners(instance, EVENT_TYPES[type], props[type]);
  }
}

function applyRenderableNodeProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  applyNodeProps(instance, props, prevProps);

  if (prevProps.fill !== props.fill) {
    if (props.fill && props.fill.applyFill) {
      props.fill.applyFill(instance);
    } else {
      instance.fill(props.fill);
    }
  }
  if (prevProps.stroke !== props.stroke || prevProps.strokeWidth !== props.strokeWidth || prevProps.strokeCap !== props.strokeCap || prevProps.strokeJoin !== props.strokeJoin ||
  // TODO: Consider deep check of stokeDash; may benefit VML in IE.
  prevProps.strokeDash !== props.strokeDash) {
    instance.stroke(props.stroke, props.strokeWidth, props.strokeCap, props.strokeJoin, props.strokeDash);
  }
}

function applyShapeProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  applyRenderableNodeProps(instance, props, prevProps);

  var path = props.d || childrenAsString(props.children);

  var prevDelta = instance._prevDelta;
  var prevPath = instance._prevPath;

  if (path !== prevPath || path.delta !== prevDelta || prevProps.height !== props.height || prevProps.width !== props.width) {
    instance.draw(path, props.width, props.height);

    instance._prevDelta = path.delta;
    instance._prevPath = path;
  }
}

function applyTextProps(instance, props) {
  var prevProps = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  applyRenderableNodeProps(instance, props, prevProps);

  var string = props.children;

  if (instance._currentString !== string || !isSameFont(props.font, prevProps.font) || props.alignment !== prevProps.alignment || props.path !== prevProps.path) {
    instance.draw(string, props.font, props.alignment, props.path);

    instance._currentString = string;
  }
}

function appendInitialChild(parentInstance, child) {
  if (typeof child === 'string') {
    // Noop for string children of Text (eg <Text>{'foo'}{'bar'}</Text>)
    invariant(false, 'Text children should already be flattened.');
    return;
  }

  child.inject(parentInstance);
}

function createInstance(type, props, internalInstanceHandle) {
  var instance = void 0;

  switch (type) {
    case TYPES.CLIPPING_RECTANGLE:
      instance = current.ClippingRectangle();
      instance._applyProps = applyClippingRectangleProps;
      break;
    case TYPES.GROUP:
      instance = current.Group();
      instance._applyProps = applyGroupProps;
      break;
    case TYPES.SHAPE:
      instance = current.Shape();
      instance._applyProps = applyShapeProps;
      break;
    case TYPES.TEXT:
      instance = current.Text(props.children, props.font, props.alignment, props.path);
      instance._applyProps = applyTextProps;
      break;
  }

  !instance ? invariant(false, 'ReactART does not support the type "%s"', type) : void 0;

  instance._applyProps(instance, props);

  return instance;
}

function createTextInstance(text, rootContainerInstance, internalInstanceHandle) {
  return text;
}

function finalizeInitialChildren(domElement, type, props) {
  return false;
}

function getPublicInstance(instance) {
  return instance;
}

function prepareForCommit() {
  // Noop
}

function prepareUpdate(domElement, type, oldProps, newProps) {
  return UPDATE_SIGNAL;
}

function resetAfterCommit() {
  // Noop
}

function resetTextContent(domElement) {
  // Noop
}

function shouldDeprioritizeSubtree(type, props) {
  return false;
}

function getRootHostContext() {
  return NO_CONTEXT;
}

function getChildHostContext() {
  return NO_CONTEXT;
}

var scheduleTimeout = setTimeout;
var cancelTimeout = clearTimeout;
var noTimeout = -1;

function shouldSetTextContent(type, props) {
  return typeof props.children === 'string' || typeof props.children === 'number';
}

// The ART renderer is secondary to the React DOM renderer.
var isPrimaryRenderer = false;

var supportsMutation = true;

function appendChild(parentInstance, child) {
  if (child.parentNode === parentInstance) {
    child.eject();
  }
  child.inject(parentInstance);
}

function appendChildToContainer(parentInstance, child) {
  if (child.parentNode === parentInstance) {
    child.eject();
  }
  child.inject(parentInstance);
}

function insertBefore(parentInstance, child, beforeChild) {
  !(child !== beforeChild) ? invariant(false, 'ReactART: Can not insert node before itself') : void 0;
  child.injectBefore(beforeChild);
}

function insertInContainerBefore(parentInstance, child, beforeChild) {
  !(child !== beforeChild) ? invariant(false, 'ReactART: Can not insert node before itself') : void 0;
  child.injectBefore(beforeChild);
}

function removeChild(parentInstance, child) {
  destroyEventListeners(child);
  child.eject();
}

function removeChildFromContainer(parentInstance, child) {
  destroyEventListeners(child);
  child.eject();
}





function commitUpdate(instance, updatePayload, type, oldProps, newProps) {
  instance._applyProps(instance, newProps, oldProps);
}

function hideInstance(instance) {
  instance.hide();
}



function unhideInstance(instance, props) {
  if (props.visible == null || props.visible) {
    instance.show();
  }
}

function unhideTextInstance(textInstance, text) {
  // Noop
}

/**
 * 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$1 = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

var ReactPropTypesSecret_1 = ReactPropTypesSecret$1;

/**
 * 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 printWarning = function() {};

{
  var ReactPropTypesSecret = ReactPropTypesSecret_1;
  var loggedTypeFailures = {};

  printWarning = function(text) {
    var message = 'Warning: ' + text;
    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) {}
  };
}

/**
 * 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.
          if (typeof typeSpecs[typeSpecName] !== 'function') {
            var err = Error(
              (componentName || 'React class') + ': ' + location + ' type `' + typeSpecName + '` is invalid; ' +
              'it must be a function, usually from the `prop-types` package, but received `' + typeof typeSpecs[typeSpecName] + '`.'
            );
            err.name = 'Invariant Violation';
            throw err;
          }
          error = typeSpecs[typeSpecName](values, typeSpecName, componentName, location, null, ReactPropTypesSecret);
        } catch (ex) {
          error = ex;
        }
        if (error && !(error instanceof Error)) {
          printWarning(
            (componentName || 'React class') + ': type specification of ' +
            location + ' `' + typeSpecName + '` is invalid; the type checker ' +
            'function must return `null` or an `Error` but returned a ' + typeof error + '. ' +
            'You may have forgotten to pass an argument to the type checker ' +
            'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' +
            'shape all require an argument).'
          );

        }
        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() : '';

          printWarning(
            'Failed ' + location + ' type: ' + error.message + (stack != null ? stack : '')
          );
        }
      }
    }
  }
}

var checkPropTypes_1 = checkPropTypes;

var BEFORE_SLASH_RE = /^(.*)[\\\/]/;

var describeComponentFrame = function (name, source, ownerName) {
  var sourceInfo = '';
  if (source) {
    var path = source.fileName;
    var fileName = path.replace(BEFORE_SLASH_RE, '');
    {
      // In DEV, include code for a common special case:
      // prefer "folder/index.js" instead of just "index.js".
      if (/^index\./.test(fileName)) {
        var match = path.match(BEFORE_SLASH_RE);
        if (match) {
          var pathBeforeSlash = match[1];
          if (pathBeforeSlash) {
            var folderName = pathBeforeSlash.replace(BEFORE_SLASH_RE, '');
            fileName = folderName + '/' + fileName;
          }
        }
      }
    }
    sourceInfo = ' (at ' + fileName + ':' + source.lineNumber + ')';
  } else if (ownerName) {
    sourceInfo = ' (created by ' + ownerName + ')';
  }
  return '\n    in ' + (name || 'Unknown') + sourceInfo;
};

var ReactDebugCurrentFrame = ReactSharedInternals.ReactDebugCurrentFrame;

function describeFiber(fiber) {
  switch (fiber.tag) {
    case HostRoot:
    case HostPortal:
    case HostText:
    case Fragment:
    case ContextProvider:
    case ContextConsumer:
      return '';
    default:
      var owner = fiber._debugOwner;
      var source = fiber._debugSource;
      var name = getComponentName(fiber.type);
      var ownerName = null;
      if (owner) {
        ownerName = getComponentName(owner.type);
      }
      return describeComponentFrame(name, source, ownerName);
  }
}

function getStackByFiberInDevAndProd(workInProgress) {
  var info = '';
  var node = workInProgress;
  do {
    info += describeFiber(node);
    node = node.return;
  } while (node);
  return info;
}

var current$1 = null;
var phase = null;

function getCurrentFiberOwnerNameInDevOrNull() {
  {
    if (current$1 === null) {
      return null;
    }
    var owner = current$1._debugOwner;
    if (owner !== null && typeof owner !== 'undefined') {
      return getComponentName(owner.type);
    }
  }
  return null;
}

function getCurrentFiberStackInDev() {
  {
    if (current$1 === null) {
      return '';
    }
    // Safe because if current fiber exists, we are reconciling,
    // and it is guaranteed to be the work-in-progress version.
    return getStackByFiberInDevAndProd(current$1);
  }
  return '';
}

function resetCurrentFiber() {
  {
    ReactDebugCurrentFrame.getCurrentStack = null;
    current$1 = null;
    phase = null;
  }
}

function setCurrentFiber(fiber) {
  {
    ReactDebugCurrentFrame.getCurrentStack = getCurrentFiberStackInDev;
    current$1 = fiber;
    phase = null;
  }
}

function setCurrentPhase(lifeCyclePhase) {
  {
    phase = lifeCyclePhase;
  }
}

var enableUserTimingAPI = true;

var enableHooks = false;
// Helps identify side effects in begin-phase lifecycle hooks and setState reducers:
var debugRenderPhaseSideEffects = false;

// In some cases, StrictMode should also double-render lifecycles.
// This can be confusing for tests though,
// And it can be bad for performance in production.
// This feature flag can be used to control the behavior:
var debugRenderPhaseSideEffectsForStrictMode = true;

// To preserve the "Pause on caught exceptions" behavior of the debugger, we
// replay the begin phase of a failed component inside invokeGuardedCallback.
var replayFailedUnitOfWorkWithInvokeGuardedCallback = true;

// Warn about deprecated, async-unsafe lifecycles; relates to RFC #6:
var warnAboutDeprecatedLifecycles = false;

// Gather advanced timing metrics for Profiler subtrees.
var enableProfilerTimer = true;

// Trace which interactions trigger each commit.
var enableSchedulerTracing = true;

// Only used in www builds.
 // TODO: true? Here it might just be false.

// Only used in www builds.


// Only used in www builds.


// React Fire: prevent the value and checked attributes from syncing
// with their related DOM properties


// These APIs will no longer be "unstable" in the upcoming 16.7 release,
// Control this behavior with a flag to support 16.6 minor releases in the meanwhile.

// Prefix measurements so that it's possible to filter them.
// Longer prefixes are hard to read in DevTools.
var reactEmoji = '\u269B';
var warningEmoji = '\u26D4';
var supportsUserTiming = typeof performance !== 'undefined' && typeof performance.mark === 'function' && typeof performance.clearMarks === 'function' && typeof performance.measure === 'function' && typeof performance.clearMeasures === 'function';

// Keep track of current fiber so that we know the path to unwind on pause.
// TODO: this looks the same as nextUnitOfWork in scheduler. Can we unify them?
var currentFiber = null;
// If we're in the middle of user code, which fiber and method is it?
// Reusing `currentFiber` would be confusing for this because user code fiber
// can change during commit phase too, but we don't need to unwind it (since
// lifecycles in the commit phase don't resemble a tree).
var currentPhase = null;
var currentPhaseFiber = null;
// Did lifecycle hook schedule an update? This is often a performance problem,
// so we will keep track of it, and include it in the report.
// Track commits caused by cascading updates.
var isCommitting = false;
var hasScheduledUpdateInCurrentCommit = false;
var hasScheduledUpdateInCurrentPhase = false;
var commitCountInCurrentWorkLoop = 0;
var effectCountInCurrentCommit = 0;
var isWaitingForCallback = false;
// During commits, we only show a measurement once per method name
// to avoid stretch the commit phase with measurement overhead.
var labelsInCurrentCommit = new Set();

var formatMarkName = function (markName) {
  return reactEmoji + ' ' + markName;
};

var formatLabel = function (label, warning) {
  var prefix = warning ? warningEmoji + ' ' : reactEmoji + ' ';
  var suffix = warning ? ' Warning: ' + warning : '';
  return '' + prefix + label + suffix;
};

var beginMark = function (markName) {
  performance.mark(formatMarkName(markName));
};

var clearMark = function (markName) {
  performance.clearMarks(formatMarkName(markName));
};

var endMark = function (label, markName, warning) {
  var formattedMarkName = formatMarkName(markName);
  var formattedLabel = formatLabel(label, warning);
  try {
    performance.measure(formattedLabel, formattedMarkName);
  } catch (err) {}
  // If previous mark was missing for some reason, this will throw.
  // This could only happen if React crashed in an unexpected place earlier.
  // Don't pile on with more errors.

  // Clear marks immediately to avoid growing buffer.
  performance.clearMarks(formattedMarkName);
  performance.clearMeasures(formattedLabel);
};

var getFiberMarkName = function (label, debugID) {
  return label + ' (#' + debugID + ')';
};

var getFiberLabel = function (componentName, isMounted, phase) {
  if (phase === null) {
    // These are composite component total time measurements.
    return componentName + ' [' + (isMounted ? 'update' : 'mount') + ']';
  } else {
    // Composite component methods.
    return componentName + '.' + phase;
  }
};

var beginFiberMark = function (fiber, phase) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);

  if (isCommitting && labelsInCurrentCommit.has(label)) {
    // During the commit phase, we don't show duplicate labels because
    // there is a fixed overhead for every measurement, and we don't
    // want to stretch the commit phase beyond necessary.
    return false;
  }
  labelsInCurrentCommit.add(label);

  var markName = getFiberMarkName(label, debugID);
  beginMark(markName);
  return true;
};

var clearFiberMark = function (fiber, phase) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);
  var markName = getFiberMarkName(label, debugID);
  clearMark(markName);
};

var endFiberMark = function (fiber, phase, warning) {
  var componentName = getComponentName(fiber.type) || 'Unknown';
  var debugID = fiber._debugID;
  var isMounted = fiber.alternate !== null;
  var label = getFiberLabel(componentName, isMounted, phase);
  var markName = getFiberMarkName(label, debugID);
  endMark(label, markName, warning);
};

var shouldIgnoreFiber = function (fiber) {
  // Host components should be skipped in the timeline.
  // We could check typeof fiber.type, but does this work with RN?
  switch (fiber.tag) {
    case HostRoot:
    case HostComponent:
    case HostText:
    case HostPortal:
    case Fragment:
    case ContextProvider:
    case ContextConsumer:
    case Mode:
      return true;
    default:
      return false;
  }
};

var clearPendingPhaseMeasurement = function () {
  if (currentPhase !== null && currentPhaseFiber !== null) {
    clearFiberMark(currentPhaseFiber, currentPhase);
  }
  currentPhaseFiber = null;
  currentPhase = null;
  hasScheduledUpdateInCurrentPhase = false;
};

var pauseTimers = function () {
  // Stops all currently active measurements so that they can be resumed
  // if we continue in a later deferred loop from the same unit of work.
  var fiber = currentFiber;
  while (fiber) {
    if (fiber._debugIsCurrentlyTiming) {
      endFiberMark(fiber, null, null);
    }
    fiber = fiber.return;
  }
};

var resumeTimersRecursively = function (fiber) {
  if (fiber.return !== null) {
    resumeTimersRecursively(fiber.return);
  }
  if (fiber._debugIsCurrentlyTiming) {
    beginFiberMark(fiber, null);
  }
};

var resumeTimers = function () {
  // Resumes all measurements that were active during the last deferred loop.
  if (currentFiber !== null) {
    resumeTimersRecursively(currentFiber);
  }
};

function recordEffect() {
  if (enableUserTimingAPI) {
    effectCountInCurrentCommit++;
  }
}

function recordScheduleUpdate() {
  if (enableUserTimingAPI) {
    if (isCommitting) {
      hasScheduledUpdateInCurrentCommit = true;
    }
    if (currentPhase !== null && currentPhase !== 'componentWillMount' && currentPhase !== 'componentWillReceiveProps') {
      hasScheduledUpdateInCurrentPhase = true;
    }
  }
}

function startRequestCallbackTimer() {
  if (enableUserTimingAPI) {
    if (supportsUserTiming && !isWaitingForCallback) {
      isWaitingForCallback = true;
      beginMark('(Waiting for async callback...)');
    }
  }
}

function stopRequestCallbackTimer(didExpire, expirationTime) {
  if (enableUserTimingAPI) {
    if (supportsUserTiming) {
      isWaitingForCallback = false;
      var warning = didExpire ? 'React was blocked by main thread' : null;
      endMark('(Waiting for async callback... will force flush in ' + expirationTime + ' ms)', '(Waiting for async callback...)', warning);
    }
  }
}

function startWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, this is the fiber to unwind from.
    currentFiber = fiber;
    if (!beginFiberMark(fiber, null)) {
      return;
    }
    fiber._debugIsCurrentlyTiming = true;
  }
}

function cancelWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // Remember we shouldn't complete measurement for this fiber.
    // Otherwise flamechart will be deep even for small updates.
    fiber._debugIsCurrentlyTiming = false;
    clearFiberMark(fiber, null);
  }
}

function stopWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, its parent is the fiber to unwind from.
    currentFiber = fiber.return;
    if (!fiber._debugIsCurrentlyTiming) {
      return;
    }
    fiber._debugIsCurrentlyTiming = false;
    endFiberMark(fiber, null, null);
  }
}

function stopFailedWorkTimer(fiber) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming || shouldIgnoreFiber(fiber)) {
      return;
    }
    // If we pause, its parent is the fiber to unwind from.
    currentFiber = fiber.return;
    if (!fiber._debugIsCurrentlyTiming) {
      return;
    }
    fiber._debugIsCurrentlyTiming = false;
    var warning = fiber.tag === SuspenseComponent ? 'Rendering was suspended' : 'An error was thrown inside this error boundary';
    endFiberMark(fiber, null, warning);
  }
}

function startPhaseTimer(fiber, phase) {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    clearPendingPhaseMeasurement();
    if (!beginFiberMark(fiber, phase)) {
      return;
    }
    currentPhaseFiber = fiber;
    currentPhase = phase;
  }
}

function stopPhaseTimer() {
  if (enableUserTimingAPI) {
    if (!supportsUserTiming) {
      return;
    }
    if (currentPhase !== null && currentPhaseFiber !== null) {
      var warning = hasScheduledUpdateInCurrentPhase ? 'Scheduled a cascading update' : null;
      endFiberMark(currentPhaseFiber, currentPhase, warning);
    }
    currentPhase = null;
    currentPhaseFiber = null;
  }
}

function startWorkLoopTimer(nextUnitOfWork) {
  if (enableUserTimingAPI) {
    currentFiber = nextUnitOfWork;
    if (!supportsUserTiming) {
      return;
    }
    commitCountInCurrentWorkLoop = 0;
    // This is top level call.
    // Any other mea