Add typings react-native-bluetooth-serial (#24908)

types/react-native-bluetooth-serial/index.d.ts

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+// Type definitions for react-native-bluetooth-serial 1.0
+// Project: https://github.com/rusel1989/react-native-bluetooth-serial
+// Definitions by: Rodrigo Weber <https://github.com/RodrigoAWeber>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+import * as React from "react";
+import * as ReactNative from "react-native";
+
+export type Buffer = (data: number[]) => void;
+
+export namespace BluetoothSerial {
+    function on(eventName: string, handler: () => void): void;
+    function removeListener(eventName: string, handler: () => void): void;
+    function write(data: Buffer | string): Promise<boolean>;
+    function list(): Promise<Array<{ id: string, name: string }>>;
+    function isEnabled(): Promise<boolean>;
+    function connect(id: string): Promise<void>;
+    function disconnect(): Promise<void>;
+    function isConnected(): Promise<boolean>;
+}

types/react-native-bluetooth-serial/react-native-bluetooth-serial-tests.tsx

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+import * as React from 'react';
+import { View, Text } from 'react-native';
+import { BluetoothSerial } from 'react-native-bluetooth-serial';
+
+class Example extends React.Component {
+	async componentDidMount() {
+		const devices = await BluetoothSerial.list();
+
+		await BluetoothSerial.connect(devices[0].id);
+
+		BluetoothSerial.write("Hello");
+
+		await BluetoothSerial.disconnect();
+	}
+	render() {
+		return (
+			<View>
+				<Text>Printer</Text>
+			</View>
+		);
+	}
+}

types/react-native-bluetooth-serial/tsconfig.json

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

types/react-native-bluetooth-serial/tslint.json

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