Add type to is-image module.

types/is-image/index.d.ts

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+// Type definitions for is-image 2.0
+// Project: https://github.com/sindresorhus/is-image#readme
+// Definitions by: Denis Frezzato <https://github.com/DenisFrezzato>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = isImage;
+
+declare function isImage(filepath: string): boolean;

types/is-image/is-image-tests.ts

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+import isImage = require('is-image');
+
+const res: boolean = isImage('/path/to/img.png');

types/is-image/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
+    },
+    "files": ["index.d.ts", "is-image-tests.ts"]
+}

types/is-image/tslint.json

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