add types of react-native-qrcode

types/react-native-qrcode/index.d.ts

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+// Type definitions for react-native-qrcode 0.2
+// Project: https://github.com/cssivision/react-native-qrcode
+// Definitions by: York Yao <https://github.com/plantain-00>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as React from 'react';
+
+export default class QRCode extends React.Component<QRCodeProperties> { }
+
+export interface QRCodeProperties {
+  value?: string;
+  size?: number;
+  bgColor?: string;
+  fgColor?: string;
+}

types/react-native-qrcode/react-native-qrcode-tests.tsx

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+import * as React from 'react';
+import QRCode from 'react-native-qrcode';
+
+import {
+  AppRegistry,
+  StyleSheet,
+  View,
+  TextInput
+} from 'react-native';
+
+class HelloWorld extends React.Component {
+  state = {
+    text: 'http://facebook.github.io/react-native/',
+  };
+
+  render() {
+    return (
+      <View style={styles.container}>
+        <TextInput
+          style={styles.input}
+          onChangeText={(text) => this.setState({ text })}
+          value={this.state.text}
+        />
+        <QRCode
+          value={this.state.text}
+          size={200}
+          bgColor='purple'
+          fgColor='white' />
+      </View>
+    );
+  }
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: 'white',
+    alignItems: 'center',
+    justifyContent: 'center'
+  },
+
+  input: {
+    height: 40,
+    borderColor: 'gray',
+    borderWidth: 1,
+    margin: 10,
+    borderRadius: 5,
+    padding: 5,
+  }
+});

types/react-native-qrcode/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-qrcode-tests.tsx"
+    ]
+}

types/react-native-qrcode/tslint.json

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