Add types for react-gateway@2.8 (#27029)

* Add types for react-gateway@2.8

* Fix linting

* Remove unnecessary lib folder

types/react-gateway/Gateway.d.ts

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+import * as React from 'react';
+
+declare namespace Gateway {
+    interface GatewayProps {
+        into: string;
+    }
+}
+declare class Gateway extends React.Component<Gateway.GatewayProps> { }
+export = Gateway;

types/react-gateway/GatewayDest.d.ts

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+import * as React from 'react';
+
+declare namespace GatewayDest {
+    interface GatewayDestProps {
+        name: string;
+        tagName?: string;
+        component?: string | React.Component;
+    }
+}
+declare class GatewayDest extends React.Component<GatewayDest.GatewayDestProps> { }
+export = GatewayDest;

types/react-gateway/GatewayProvider.d.ts

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+import * as React from 'react';
+
+declare class GatewayProvider extends React.Component { }
+export = GatewayProvider;

types/react-gateway/GatewayRegistry.d.ts

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+declare class GatewayRegistry {
+    _containers: { [name: string]: React.Component | null | undefined };
+    _children: { [name: string]: { [gatewayId: string]: React.ReactNode } | undefined };
+    _currentId: number;
+
+    _renderContainer(name: string): void;
+
+    addContainer(name: string, container: React.Component): void;
+
+    removeContainer(name: string): void;
+
+    addChild(name: string, gatewayId: string, child: React.ReactNode): void;
+
+    clearChild(name: string, gatewayId: string): void;
+
+    register(name: string, child: React.ReactNode): string;
+
+    unregister(name: string, gatewayId: string): void;
+}
+export = GatewayRegistry;

types/react-gateway/index.d.ts

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+// Type definitions for react-gateway 2.8
+// Project: https://github.com/cloudflare/react-gateway
+// Definitions by: Jason Unger <https://github.com/jsonunger>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+import Gateway = require('./Gateway');
+import { GatewayProps } from './Gateway';
+import GatewayDest = require('./GatewayDest');
+import { GatewayDestProps } from './GatewayDest';
+import GatewayProvider = require('./GatewayProvider');
+import GatewayRegistry = require('./GatewayRegistry');
+
+export {
+    Gateway,
+    GatewayProps,
+    GatewayDest,
+    GatewayDestProps,
+    GatewayProvider,
+    GatewayRegistry
+};

types/react-gateway/react-gateway-tests.tsx

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+import * as React from 'react';
+import { Gateway, GatewayProvider, GatewayDest } from 'react-gateway';
+
+class ReactGateway extends React.Component<Gateway.GatewayProps> {
+    render() {
+        return (
+            <Gateway {...this.props}>
+                <div>
+                    Text goes here.
+                </div>
+            </Gateway>
+        );
+    }
+}
+
+class ReactGatewayProvider extends React.Component {
+    render() {
+        return (
+            <GatewayProvider>
+                <GatewayDest name="test" />
+                <div>
+                    All the way down...
+                    <div>
+                        Almost there...
+                        <div>
+                            Getting close...
+                            <div>
+                                <ReactGateway into="test" />
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </GatewayProvider>
+        );
+    }
+}

types/react-gateway/tsconfig.json

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

types/react-gateway/tslint.json

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+{ "extends": "dtslint/dt.json" }