Fix.

node_modules/react-is/README.md

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+# `react-is`
+
+This package allows you to test arbitrary values and see if they're a particular React element type.
+
+## Installation
+
+```sh
+# Yarn
+yarn add react-is
+
+# NPM
+npm install react-is
+```
+
+## Usage
+
+### Determining if a Component is Valid
+
+```js
+import React from "react";
+import * as ReactIs from "react-is";
+
+class ClassComponent extends React.Component {
+  render() {
+    return React.createElement("div");
+  }
+}
+
+const StatelessComponent = () => React.createElement("div");
+
+const ForwardRefComponent = React.forwardRef((props, ref) =>
+  React.createElement(Component, { forwardedRef: ref, ...props })
+);
+
+const Context = React.createContext(false);
+
+ReactIs.isValidElementType("div"); // true
+ReactIs.isValidElementType(ClassComponent); // true
+ReactIs.isValidElementType(StatelessComponent); // true
+ReactIs.isValidElementType(ForwardRefComponent); // true
+ReactIs.isValidElementType(Context.Provider); // true
+ReactIs.isValidElementType(Context.Consumer); // true
+ReactIs.isValidElementType(React.createFactory("div")); // true
+```
+
+### Determining an Element's Type
+
+#### ConcurrentMode
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isConcurrentMode(<React.unstable_ConcurrentMode />); // true
+ReactIs.typeOf(<React.unstable_ConcurrentMode />) === ReactIs.ConcurrentMode; // true
+```
+
+#### Context
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+const ThemeContext = React.createContext("blue");
+
+ReactIs.isContextConsumer(<ThemeContext.Consumer />); // true
+ReactIs.isContextProvider(<ThemeContext.Provider />); // true
+ReactIs.typeOf(<ThemeContext.Provider />) === ReactIs.ContextProvider; // true
+ReactIs.typeOf(<ThemeContext.Consumer />) === ReactIs.ContextConsumer; // true
+```
+
+#### Element
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isElement(<div />); // true
+ReactIs.typeOf(<div />) === ReactIs.Element; // true
+```
+
+#### Fragment
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isFragment(<></>); // true
+ReactIs.typeOf(<></>) === ReactIs.Fragment; // true
+```
+
+#### Portal
+
+```js
+import React from "react";
+import ReactDOM from "react-dom";
+import * as ReactIs from 'react-is';
+
+const div = document.createElement("div");
+const portal = ReactDOM.createPortal(<div />, div);
+
+ReactIs.isPortal(portal); // true
+ReactIs.typeOf(portal) === ReactIs.Portal; // true
+```
+
+#### StrictMode
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isStrictMode(<React.StrictMode />); // true
+ReactIs.typeOf(<React.StrictMode />) === ReactIs.StrictMode; // true
+```