planning

node_modules/react-router/modules/HistoryContext.js

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+import createNamedContext from "./createNamedContext";
+
+const historyContext = /*#__PURE__*/ createNamedContext("Router-History");
+export default historyContext;

node_modules/react-router/modules/Lifecycle.js

@@ -0,0 +1,21 @@
+import React from "react";
+
+class Lifecycle extends React.Component {
+  componentDidMount() {
+    if (this.props.onMount) this.props.onMount.call(this, this);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.props.onUpdate) this.props.onUpdate.call(this, this, prevProps);
+  }
+
+  componentWillUnmount() {
+    if (this.props.onUnmount) this.props.onUnmount.call(this, this);
+  }
+
+  render() {
+    return null;
+  }
+}
+
+export default Lifecycle;

node_modules/react-router/modules/MemoryRouter.js

@@ -0,0 +1,37 @@
+import React from "react";
+import PropTypes from "prop-types";
+import { createMemoryHistory as createHistory } from "history";
+import warning from "tiny-warning";
+
+import Router from "./Router.js";
+
+/**
+ * The public API for a <Router> that stores location in memory.
+ */
+class MemoryRouter extends React.Component {
+  history = createHistory(this.props);
+
+  render() {
+    return <Router history={this.history} children={this.props.children} />;
+  }
+}
+
+if (__DEV__) {
+  MemoryRouter.propTypes = {
+    initialEntries: PropTypes.array,
+    initialIndex: PropTypes.number,
+    getUserConfirmation: PropTypes.func,
+    keyLength: PropTypes.number,
+    children: PropTypes.node
+  };
+
+  MemoryRouter.prototype.componentDidMount = function() {
+    warning(
+      !this.props.history,
+      "<MemoryRouter> ignores the history prop. To use a custom history, " +
+        "use `import { Router }` instead of `import { MemoryRouter as Router }`."
+    );
+  };
+}
+
+export default MemoryRouter;

node_modules/react-router/modules/Prompt.js

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+import React from "react";
+import PropTypes from "prop-types";
+import invariant from "tiny-invariant";
+
+import Lifecycle from "./Lifecycle.js";
+import RouterContext from "./RouterContext.js";
+
+/**
+ * The public API for prompting the user before navigating away from a screen.
+ */
+function Prompt({ message, when = true }) {
+  return (
+    <RouterContext.Consumer>
+      {context => {
+        invariant(context, "You should not use <Prompt> outside a <Router>");
+
+        if (!when || context.staticContext) return null;
+
+        const method = context.history.block;
+
+        return (
+          <Lifecycle
+            onMount={self => {
+              self.release = method(message);
+            }}
+            onUpdate={(self, prevProps) => {
+              if (prevProps.message !== message) {
+                self.release();
+                self.release = method(message);
+              }
+            }}
+            onUnmount={self => {
+              self.release();
+            }}
+            message={message}
+          />
+        );
+      }}
+    </RouterContext.Consumer>
+  );
+}
+
+if (__DEV__) {
+  const messageType = PropTypes.oneOfType([PropTypes.func, PropTypes.string]);
+
+  Prompt.propTypes = {
+    when: PropTypes.bool,
+    message: messageType.isRequired
+  };
+}
+
+export default Prompt;

node_modules/react-router/modules/Redirect.js

@@ -0,0 +1,72 @@
+import React from "react";
+import PropTypes from "prop-types";
+import { createLocation, locationsAreEqual } from "history";
+import invariant from "tiny-invariant";
+
+import Lifecycle from "./Lifecycle.js";
+import RouterContext from "./RouterContext.js";
+import generatePath from "./generatePath.js";
+
+/**
+ * The public API for navigating programmatically with a component.
+ */
+function Redirect({ computedMatch, to, push = false }) {
+  return (
+    <RouterContext.Consumer>
+      {context => {
+        invariant(context, "You should not use <Redirect> outside a <Router>");
+
+        const { history, staticContext } = context;
+
+        const method = push ? history.push : history.replace;
+        const location = createLocation(
+          computedMatch
+            ? typeof to === "string"
+              ? generatePath(to, computedMatch.params)
+              : {
+                  ...to,
+                  pathname: generatePath(to.pathname, computedMatch.params)
+                }
+            : to
+        );
+
+        // When rendering in a static context,
+        // set the new location immediately.
+        if (staticContext) {
+          method(location);
+          return null;
+        }
+
+        return (
+          <Lifecycle
+            onMount={() => {
+              method(location);
+            }}
+            onUpdate={(self, prevProps) => {
+              const prevLocation = createLocation(prevProps.to);
+              if (
+                !locationsAreEqual(prevLocation, {
+                  ...location,
+                  key: prevLocation.key
+                })
+              ) {
+                method(location);
+              }
+            }}
+            to={to}
+          />
+        );
+      }}
+    </RouterContext.Consumer>
+  );
+}
+
+if (__DEV__) {
+  Redirect.propTypes = {
+    push: PropTypes.bool,
+    from: PropTypes.string,
+    to: PropTypes.oneOfType([PropTypes.string, PropTypes.object]).isRequired
+  };
+}
+
+export default Redirect;

node_modules/react-router/modules/Route.js

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+import React from "react";
+import { isValidElementType } from "react-is";
+import PropTypes from "prop-types";
+import invariant from "tiny-invariant";
+import warning from "tiny-warning";
+
+import RouterContext from "./RouterContext.js";
+import matchPath from "./matchPath.js";
+
+function isEmptyChildren(children) {
+  return React.Children.count(children) === 0;
+}
+
+function evalChildrenDev(children, props, path) {
+  const value = children(props);
+
+  warning(
+    value !== undefined,
+    "You returned `undefined` from the `children` function of " +
+      `<Route${path ? ` path="${path}"` : ""}>, but you ` +
+      "should have returned a React element or `null`"
+  );
+
+  return value || null;
+}
+
+/**
+ * The public API for matching a single path and rendering.
+ */
+class Route extends React.Component {
+  render() {
+    return (
+      <RouterContext.Consumer>
+        {context => {
+          invariant(context, "You should not use <Route> outside a <Router>");
+
+          const location = this.props.location || context.location;
+          const match = this.props.computedMatch
+            ? this.props.computedMatch // <Switch> already computed the match for us
+            : this.props.path
+            ? matchPath(location.pathname, this.props)
+            : context.match;
+
+          const props = { ...context, location, match };
+
+          let { children, component, render } = this.props;
+
+          // Preact uses an empty array as children by
+          // default, so use null if that's the case.
+          if (Array.isArray(children) && isEmptyChildren(children)) {
+            children = null;
+          }
+
+          return (
+            <RouterContext.Provider value={props}>
+              {props.match
+                ? children
+                  ? typeof children === "function"
+                    ? __DEV__
+                      ? evalChildrenDev(children, props, this.props.path)
+                      : children(props)
+                    : children
+                  : component
+                  ? React.createElement(component, props)
+                  : render
+                  ? render(props)
+                  : null
+                : typeof children === "function"
+                ? __DEV__
+                  ? evalChildrenDev(children, props, this.props.path)
+                  : children(props)
+                : null}
+            </RouterContext.Provider>
+          );
+        }}
+      </RouterContext.Consumer>
+    );
+  }
+}
+
+if (__DEV__) {
+  Route.propTypes = {
+    children: PropTypes.oneOfType([PropTypes.func, PropTypes.node]),
+    component: (props, propName) => {
+      if (props[propName] && !isValidElementType(props[propName])) {
+        return new Error(
+          `Invalid prop 'component' supplied to 'Route': the prop is not a valid React component`
+        );
+      }
+    },
+    exact: PropTypes.bool,
+    location: PropTypes.object,
+    path: PropTypes.oneOfType([
+      PropTypes.string,
+      PropTypes.arrayOf(PropTypes.string)
+    ]),
+    render: PropTypes.func,
+    sensitive: PropTypes.bool,
+    strict: PropTypes.bool
+  };
+
+  Route.prototype.componentDidMount = function() {
+    warning(
+      !(
+        this.props.children &&
+        !isEmptyChildren(this.props.children) &&
+        this.props.component
+      ),
+      "You should not use <Route component> and <Route children> in the same route; <Route component> will be ignored"
+    );
+
+    warning(
+      !(
+        this.props.children &&
+        !isEmptyChildren(this.props.children) &&
+        this.props.render
+      ),
+      "You should not use <Route render> and <Route children> in the same route; <Route render> will be ignored"
+    );
+
+    warning(
+      !(this.props.component && this.props.render),
+      "You should not use <Route component> and <Route render> in the same route; <Route render> will be ignored"
+    );
+  };
+
+  Route.prototype.componentDidUpdate = function(prevProps) {
+    warning(
+      !(this.props.location && !prevProps.location),
+      '<Route> elements should not change from uncontrolled to controlled (or vice versa). You initially used no "location" prop and then provided one on a subsequent render.'
+    );
+
+    warning(
+      !(!this.props.location && prevProps.location),
+      '<Route> elements should not change from controlled to uncontrolled (or vice versa). You provided a "location" prop initially but omitted it on a subsequent render.'
+    );
+  };
+}
+
+export default Route;

node_modules/react-router/modules/Router.js

@@ -0,0 +1,100 @@
+import React from "react";
+import PropTypes from "prop-types";
+import warning from "tiny-warning";
+
+import HistoryContext from "./HistoryContext.js";
+import RouterContext from "./RouterContext.js";
+
+/**
+ * The public API for putting history on context.
+ */
+class Router extends React.Component {
+  static computeRootMatch(pathname) {
+    return { path: "/", url: "/", params: {}, isExact: pathname === "/" };
+  }
+
+  constructor(props) {
+    super(props);
+
+    this.state = {
+      location: props.history.location
+    };
+
+    // This is a bit of a hack. We have to start listening for location
+    // changes here in the constructor in case there are any <Redirect>s
+    // on the initial render. If there are, they will replace/push when
+    // they mount and since cDM fires in children before parents, we may
+    // get a new location before the <Router> is mounted.
+    this._isMounted = false;
+    this._pendingLocation = null;
+
+    if (!props.staticContext) {
+      this.unlisten = props.history.listen(location => {
+        this._pendingLocation = location;
+      });
+    }
+  }
+
+  componentDidMount() {
+    this._isMounted = true;
+
+    if (this.unlisten) {
+      // Any pre-mount location changes have been captured at
+      // this point, so unregister the listener.
+      this.unlisten();
+    }
+    if (!this.props.staticContext) {
+      this.unlisten = this.props.history.listen(location => {
+        if (this._isMounted) {
+          this.setState({ location });
+        }
+      });
+    }
+    if (this._pendingLocation) {
+      this.setState({ location: this._pendingLocation });
+    }
+  }
+
+  componentWillUnmount() {
+    if (this.unlisten) {
+      this.unlisten();
+      this._isMounted = false;
+      this._pendingLocation = null;
+    }
+  }
+
+  render() {
+    return (
+      <RouterContext.Provider
+        value={{
+          history: this.props.history,
+          location: this.state.location,
+          match: Router.computeRootMatch(this.state.location.pathname),
+          staticContext: this.props.staticContext
+        }}
+      >
+        <HistoryContext.Provider
+          children={this.props.children || null}
+          value={this.props.history}
+        />
+      </RouterContext.Provider>
+    );
+  }
+}
+
+if (__DEV__) {
+  Router.propTypes = {
+    children: PropTypes.node,
+    history: PropTypes.object.isRequired,
+    staticContext: PropTypes.object
+  };
+
+  Router.prototype.componentDidUpdate = function(prevProps) {
+    warning(
+      prevProps.history === this.props.history,
+      "You cannot change <Router history>"
+    );
+  };
+}
+
+export default Router;

node_modules/react-router/modules/RouterContext.js

@@ -0,0 +1,4 @@
+import createNamedContext from "./createNamedContext";
+
+const context = /*#__PURE__*/ createNamedContext("Router");
+export default context;

node_modules/react-router/modules/StaticRouter.js

@@ -0,0 +1,102 @@
+import React from "react";
+import PropTypes from "prop-types";
+import { createLocation, createPath } from "history";
+import invariant from "tiny-invariant";
+import warning from "tiny-warning";
+
+import Router from "./Router.js";
+
+function addLeadingSlash(path) {
+  return path.charAt(0) === "/" ? path : "/" + path;
+}
+
+function addBasename(basename, location) {
+  if (!basename) return location;
+
+  return {
+    ...location,
+    pathname: addLeadingSlash(basename) + location.pathname
+  };
+}
+
+function stripBasename(basename, location) {
+  if (!basename) return location;
+
+  const base = addLeadingSlash(basename);
+
+  if (location.pathname.indexOf(base) !== 0) return location;
+
+  return {
+    ...location,
+    pathname: location.pathname.substr(base.length)
+  };
+}
+
+function createURL(location) {
+  return typeof location === "string" ? location : createPath(location);
+}
+
+function staticHandler(methodName) {
+  return () => {
+    invariant(false, "You cannot %s with <StaticRouter>", methodName);
+  };
+}
+
+function noop() {}
+
+/**
+ * The public top-level API for a "static" <Router>, so-called because it
+ * can't actually change the current location. Instead, it just records
+ * location changes in a context object. Useful mainly in testing and
+ * server-rendering scenarios.
+ */
+class StaticRouter extends React.Component {
+  navigateTo(location, action) {
+    const { basename = "", context = {} } = this.props;
+    context.action = action;
+    context.location = addBasename(basename, createLocation(location));
+    context.url = createURL(context.location);
+  }
+
+  handlePush = location => this.navigateTo(location, "PUSH");
+  handleReplace = location => this.navigateTo(location, "REPLACE");
+  handleListen = () => noop;
+  handleBlock = () => noop;
+
+  render() {
+    const { basename = "", context = {}, location = "/", ...rest } = this.props;
+
+    const history = {
+      createHref: path => addLeadingSlash(basename + createURL(path)),
+      action: "POP",
+      location: stripBasename(basename, createLocation(location)),
+      push: this.handlePush,
+      replace: this.handleReplace,
+      go: staticHandler("go"),
+      goBack: staticHandler("goBack"),
+      goForward: staticHandler("goForward"),
+      listen: this.handleListen,
+      block: this.handleBlock
+    };
+
+    return <Router {...rest} history={history} staticContext={context} />;
+  }
+}
+
+if (__DEV__) {
+  StaticRouter.propTypes = {
+    basename: PropTypes.string,
+    context: PropTypes.object,
+    location: PropTypes.oneOfType([PropTypes.string, PropTypes.object])
+  };
+
+  StaticRouter.prototype.componentDidMount = function() {
+    warning(
+      !this.props.history,
+      "<StaticRouter> ignores the history prop. To use a custom history, " +
+        "use `import { Router }` instead of `import { StaticRouter as Router }`."
+    );
+  };
+}
+
+export default StaticRouter;

node_modules/react-router/modules/Switch.js

@@ -0,0 +1,67 @@
+import React from "react";
+import PropTypes from "prop-types";
+import invariant from "tiny-invariant";
+import warning from "tiny-warning";
+
+import RouterContext from "./RouterContext.js";
+import matchPath from "./matchPath.js";
+
+/**
+ * The public API for rendering the first <Route> that matches.
+ */
+class Switch extends React.Component {
+  render() {
+    return (
+      <RouterContext.Consumer>
+        {context => {
+          invariant(context, "You should not use <Switch> outside a <Router>");
+
+          const location = this.props.location || context.location;
+
+          let element, match;
+
+          // We use React.Children.forEach instead of React.Children.toArray().find()
+          // here because toArray adds keys to all child elements and we do not want
+          // to trigger an unmount/remount for two <Route>s that render the same
+          // component at different URLs.
+          React.Children.forEach(this.props.children, child => {
+            if (match == null && React.isValidElement(child)) {
+              element = child;
+
+              const path = child.props.path || child.props.from;
+
+              match = path
+                ? matchPath(location.pathname, { ...child.props, path })
+                : context.match;
+            }
+          });
+
+          return match
+            ? React.cloneElement(element, { location, computedMatch: match })
+            : null;
+        }}
+      </RouterContext.Consumer>
+    );
+  }
+}
+
+if (__DEV__) {
+  Switch.propTypes = {
+    children: PropTypes.node,
+    location: PropTypes.object
+  };
+
+  Switch.prototype.componentDidUpdate = function(prevProps) {
+    warning(
+      !(this.props.location && !prevProps.location),
+      '<Switch> elements should not change from uncontrolled to controlled (or vice versa). You initially used no "location" prop and then provided one on a subsequent render.'
+    );
+
+    warning(
+      !(!this.props.location && prevProps.location),
+      '<Switch> elements should not change from controlled to uncontrolled (or vice versa). You provided a "location" prop initially but omitted it on a subsequent render.'
+    );
+  };
+}
+
+export default Switch;

node_modules/react-router/modules/createContext.js

@@ -0,0 +1,8 @@
+// MIT License
+// Copyright (c) 2019-present StringEpsilon <StringEpsilon@gmail.com>
+// Copyright (c) 2017-2019 James Kyle <me@thejameskyle.com>
+// https://github.com/StringEpsilon/mini-create-react-context
+import React from "react";
+import createReactContext from "./miniCreateReactContext";
+
+export default React.createContext || createReactContext;

node_modules/react-router/modules/createNamedContext.js

@@ -0,0 +1,11 @@
+// TODO: Replace with React.createContext once we can assume React 16+
+import createContext from "./createContext";
+
+const createNamedContext = name => {
+  const context = createContext();
+  context.displayName = name;
+
+  return context;
+};
+
+export default createNamedContext;

node_modules/react-router/modules/generatePath.js

@@ -0,0 +1,27 @@
+import pathToRegexp from "path-to-regexp";
+
+const cache = {};
+const cacheLimit = 10000;
+let cacheCount = 0;
+
+function compilePath(path) {
+  if (cache[path]) return cache[path];
+
+  const generator = pathToRegexp.compile(path);
+
+  if (cacheCount < cacheLimit) {
+    cache[path] = generator;
+    cacheCount++;
+  }
+
+  return generator;
+}
+
+/**
+ * Public API for generating a URL pathname from a path and parameters.
+ */
+function generatePath(path = "/", params = {}) {
+  return path === "/" ? path : compilePath(path)(params, { pretty: true });
+}
+
+export default generatePath;

node_modules/react-router/modules/hooks.js

@@ -0,0 +1,55 @@
+import React from "react";
+import invariant from "tiny-invariant";
+
+import RouterContext from "./RouterContext.js";
+import HistoryContext from "./HistoryContext.js";
+import matchPath from "./matchPath.js";
+
+const useContext = React.useContext;
+
+export function useHistory() {
+  if (__DEV__) {
+    invariant(
+      typeof useContext === "function",
+      "You must use React >= 16.8 in order to use useHistory()"
+    );
+  }
+
+  return useContext(HistoryContext);
+}
+
+export function useLocation() {
+  if (__DEV__) {
+    invariant(
+      typeof useContext === "function",
+      "You must use React >= 16.8 in order to use useLocation()"
+    );
+  }
+
+  return useContext(RouterContext).location;
+}
+
+export function useParams() {
+  if (__DEV__) {
+    invariant(
+      typeof useContext === "function",
+      "You must use React >= 16.8 in order to use useParams()"
+    );
+  }
+
+  const match = useContext(RouterContext).match;
+  return match ? match.params : {};
+}
+
+export function useRouteMatch(path) {
+  if (__DEV__) {
+    invariant(
+      typeof useContext === "function",
+      "You must use React >= 16.8 in order to use useRouteMatch()"
+    );
+  }
+
+  const location = useLocation();
+  const match = useContext(RouterContext).match;
+  return path ? matchPath(location.pathname, path) : match;
+}

node_modules/react-router/modules/index.js

@@ -0,0 +1,38 @@
+if (__DEV__) {
+  if (typeof window !== "undefined") {
+    const global = window;
+    const key = "__react_router_build__";
+    const buildNames = { cjs: "CommonJS", esm: "ES modules", umd: "UMD" };
+
+    if (global[key] && global[key] !== process.env.BUILD_FORMAT) {
+      const initialBuildName = buildNames[global[key]];
+      const secondaryBuildName = buildNames[process.env.BUILD_FORMAT];
+
+      // TODO: Add link to article that explains in detail how to avoid
+      // loading 2 different builds.
+      throw new Error(
+        `You are loading the ${secondaryBuildName} build of React Router ` +
+          `on a page that is already running the ${initialBuildName} ` +
+          `build, so things won't work right.`
+      );
+    }
+
+    global[key] = process.env.BUILD_FORMAT;
+  }
+}
+
+export { default as MemoryRouter } from "./MemoryRouter.js";
+export { default as Prompt } from "./Prompt.js";
+export { default as Redirect } from "./Redirect.js";
+export { default as Route } from "./Route.js";
+export { default as Router } from "./Router.js";
+export { default as StaticRouter } from "./StaticRouter.js";
+export { default as Switch } from "./Switch.js";
+export { default as generatePath } from "./generatePath.js";
+export { default as matchPath } from "./matchPath.js";
+export { default as withRouter } from "./withRouter.js";
+
+export { default as __HistoryContext } from "./HistoryContext.js";
+export { default as __RouterContext } from "./RouterContext.js";
+
+export { useHistory, useLocation, useParams, useRouteMatch } from "./hooks.js";

node_modules/react-router/modules/matchPath.js

@@ -0,0 +1,67 @@
+import pathToRegexp from "path-to-regexp";
+
+const cache = {};
+const cacheLimit = 10000;
+let cacheCount = 0;
+
+function compilePath(path, options) {
+  const cacheKey = `${options.end}${options.strict}${options.sensitive}`;
+  const pathCache = cache[cacheKey] || (cache[cacheKey] = {});
+
+  if (pathCache[path]) return pathCache[path];
+
+  const keys = [];
+  const regexp = pathToRegexp(path, keys, options);
+  const result = { regexp, keys };
+
+  if (cacheCount < cacheLimit) {
+    pathCache[path] = result;
+    cacheCount++;
+  }
+
+  return result;
+}
+
+/**
+ * Public API for matching a URL pathname to a path.
+ */
+function matchPath(pathname, options = {}) {
+  if (typeof options === "string" || Array.isArray(options)) {
+    options = { path: options };
+  }
+
+  const { path, exact = false, strict = false, sensitive = false } = options;
+
+  const paths = [].concat(path);
+
+  return paths.reduce((matched, path) => {
+    if (!path && path !== "") return null;
+    if (matched) return matched;
+
+    const { regexp, keys } = compilePath(path, {
+      end: exact,
+      strict,
+      sensitive
+    });
+    const match = regexp.exec(pathname);
+
+    if (!match) return null;
+
+    const [url, ...values] = match;
+    const isExact = pathname === url;
+
+    if (exact && !isExact) return null;
+
+    return {
+      path, // the path used to match
+      url: path === "/" && url === "" ? "/" : url, // the matched portion of the URL
+      isExact, // whether or not we matched exactly
+      params: keys.reduce((memo, key, index) => {
+        memo[key.name] = values[index];
+        return memo;
+      }, {})
+    };
+  }, null);
+}
+
+export default matchPath;

node_modules/react-router/modules/miniCreateReactContext.js

@@ -0,0 +1,175 @@
+// MIT License
+// Copyright (c) 2019-present StringEpsilon <StringEpsilon@gmail.com>
+// Copyright (c) 2017-2019 James Kyle <me@thejameskyle.com>
+// https://github.com/StringEpsilon/mini-create-react-context
+import React from "react";
+import PropTypes from "prop-types";
+import warning from "tiny-warning";
+
+const MAX_SIGNED_31_BIT_INT = 1073741823;
+
+const commonjsGlobal =
+  typeof globalThis !== "undefined" // 'global proper'
+    ? // eslint-disable-next-line no-undef
+      globalThis
+    : typeof window !== "undefined"
+    ? window // Browser
+    : typeof global !== "undefined"
+    ? global // node.js
+    : {};
+
+function getUniqueId() {
+  let key = "__global_unique_id__";
+  return (commonjsGlobal[key] = (commonjsGlobal[key] || 0) + 1);
+}
+
+// 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 {
+    // eslint-disable-next-line no-self-compare
+    return x !== x && y !== y;
+  }
+}
+
+function createEventEmitter(value) {
+  let handlers = [];
+  return {
+    on(handler) {
+      handlers.push(handler);
+    },
+
+    off(handler) {
+      handlers = handlers.filter(h => h !== handler);
+    },
+
+    get() {
+      return value;
+    },
+
+    set(newValue, changedBits) {
+      value = newValue;
+      handlers.forEach(handler => handler(value, changedBits));
+    }
+  };
+}
+
+function onlyChild(children) {
+  return Array.isArray(children) ? children[0] : children;
+}
+
+export default function createReactContext(defaultValue, calculateChangedBits) {
+  const contextProp = "__create-react-context-" + getUniqueId() + "__";
+
+  class Provider extends React.Component {
+    emitter = createEventEmitter(this.props.value);
+
+    static childContextTypes = {
+      [contextProp]: PropTypes.object.isRequired
+    };
+
+    getChildContext() {
+      return {
+        [contextProp]: this.emitter
+      };
+    }
+
+    componentWillReceiveProps(nextProps) {
+      if (this.props.value !== nextProps.value) {
+        let oldValue = this.props.value;
+        let newValue = nextProps.value;
+        let changedBits;
+
+        if (objectIs(oldValue, newValue)) {
+          changedBits = 0; // No change
+        } else {
+          changedBits =
+            typeof calculateChangedBits === "function"
+              ? calculateChangedBits(oldValue, newValue)
+              : MAX_SIGNED_31_BIT_INT;
+          if (process.env.NODE_ENV !== "production") {
+            warning(
+              (changedBits & MAX_SIGNED_31_BIT_INT) === changedBits,
+              "calculateChangedBits: Expected the return value to be a " +
+                "31-bit integer. Instead received: " +
+                changedBits
+            );
+          }
+
+          changedBits |= 0;
+
+          if (changedBits !== 0) {
+            this.emitter.set(nextProps.value, changedBits);
+          }
+        }
+      }
+    }
+
+    render() {
+      return this.props.children;
+    }
+  }
+
+  class Consumer extends React.Component {
+    static contextTypes = {
+      [contextProp]: PropTypes.object
+    };
+
+    observedBits;
+
+    state = {
+      value: this.getValue()
+    };
+
+    componentWillReceiveProps(nextProps) {
+      let { observedBits } = nextProps;
+      this.observedBits =
+        observedBits === undefined || observedBits === null
+          ? MAX_SIGNED_31_BIT_INT // Subscribe to all changes by default
+          : observedBits;
+    }
+
+    componentDidMount() {
+      if (this.context[contextProp]) {
+        this.context[contextProp].on(this.onUpdate);
+      }
+      let { observedBits } = this.props;
+      this.observedBits =
+        observedBits === undefined || observedBits === null
+          ? MAX_SIGNED_31_BIT_INT // Subscribe to all changes by default
+          : observedBits;
+    }
+
+    componentWillUnmount() {
+      if (this.context[contextProp]) {
+        this.context[contextProp].off(this.onUpdate);
+      }
+    }
+
+    getValue() {
+      if (this.context[contextProp]) {
+        return this.context[contextProp].get();
+      } else {
+        return defaultValue;
+      }
+    }
+
+    onUpdate = (newValue, changedBits) => {
+      const observedBits = this.observedBits | 0;
+      if ((observedBits & changedBits) !== 0) {
+        this.setState({ value: this.getValue() });
+      }
+    };
+
+    render() {
+      return onlyChild(this.props.children)(this.state.value);
+    }
+  }
+
+  return {
+    Provider,
+    Consumer
+  };
+}

node_modules/react-router/modules/withRouter.js

@@ -0,0 +1,51 @@
+import React from "react";
+import PropTypes from "prop-types";
+import hoistStatics from "hoist-non-react-statics";
+import invariant from "tiny-invariant";
+
+import RouterContext from "./RouterContext.js";
+
+/**
+ * A public higher-order component to access the imperative API
+ */
+function withRouter(Component) {
+  const displayName = `withRouter(${Component.displayName || Component.name})`;
+  const C = props => {
+    const { wrappedComponentRef, ...remainingProps } = props;
+
+    return (
+      <RouterContext.Consumer>
+        {context => {
+          invariant(
+            context,
+            `You should not use <${displayName} /> outside a <Router>`
+          );
+          return (
+            <Component
+              {...remainingProps}
+              {...context}
+              ref={wrappedComponentRef}
+            />
+          );
+        }}
+      </RouterContext.Consumer>
+    );
+  };
+
+  C.displayName = displayName;
+  C.WrappedComponent = Component;
+
+  if (__DEV__) {
+    C.propTypes = {
+      wrappedComponentRef: PropTypes.oneOfType([
+        PropTypes.string,
+        PropTypes.func,
+        PropTypes.object
+      ])
+    };
+  }
+
+  return hoistStatics(C, Component);
+}
+
+export default withRouter;