Add types for react-native-scaled-image (#29397)

* Add types for react-native-scaled-image

* Lint fixes

types/react-native-scaled-image/index.d.ts

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+// Type definitions for react-native-scaled-image 0.0
+// Project: https://github.com/nanlabs/react-native-scaled-image
+// Definitions by: Matt Jaeger <https://github.com/Jaeger25>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import * as React from 'react';
+import { ImageSourcePropType, StyleProp, ImageStyle } from 'react-native';
+
+export interface ScaledImageProps {
+  source: ImageSourcePropType;
+  height?: number;
+  width?: number;
+  style?: StyleProp<ImageStyle>;
+}
+
+export default class ScaledImage extends React.Component<ScaledImageProps> {}

types/react-native-scaled-image/react-native-scaled-image-tests.tsx

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+import * as React from 'react';
+import ScaledImage from 'react-native-scaled-image';
+
+class Example extends React.Component {
+    render() {
+        return (
+          <ScaledImage
+              source={require('image.png')}
+              style={{ resizeMode: 'contain' }}
+              width={360} />
+        );
+    }
+}
+
+export default Example;

types/react-native-scaled-image/tsconfig.json

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

types/react-native-scaled-image/tslint.json

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