Add react-tether definition (#14913)

react-tether/index.d.ts

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+// Type definitions for react-tether 0.5
+// Project: https://github.com/souporserious/react-tether
+// Definitions by: Ryan Price <https://github.com/ryprice>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+export default TetherComponent;
+export as namespace ReactTether;
+
+import * as React from 'react';
+import * as Tether from 'tether';
+
+declare class TetherComponent extends React.Component<ReactTether.TetherComponentProps, null> { }
+
+declare namespace ReactTether {
+    export interface TetherComponentProps extends React.Props<TetherComponent>, Tether.ITetherOptions {
+        renderElementTag?: string;
+        renderElementTo?: string | {appendChild: (element: HTMLElement) => void};
+        id?: string;
+        className?: string;
+        style?: React.CSSProperties;
+        onUpdate?: () => void;
+        onRepositioned?: () => void;
+    }
+}

react-tether/react-tether-tests.tsx

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+import TetherComponent from "react-tether";
+import * as React from "react";
+
+const ReactTetherAllOptions: JSX.Element =
+    <TetherComponent
+        attachment="bottom middle"
+        id="id123"
+        className="react-tether"
+        onUpdate={() => {}}
+        onRepositioned={() => {}}
+        renderElementTag="div"
+        renderElementTo=".container"
+    />;
+
+const ReactTetherRequiredOptions: JSX.Element =
+    <TetherComponent attachment="bottom middle" />;

react-tether/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "jsx": "react",
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-tether-tests.tsx"
+    ]
+}
+

react-tether/tslint.json

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+{ "extends": "../tslint.json" }
+