Adds type definitions for 'valid-data-url' (#36158)

Adds type definitions and tests
Adds tsconfig and tslint config

types/valid-data-url/index.d.ts

@@ -0,0 +1,13 @@
+// Type definitions for valid-data-url 2.0
+// Project: https://github.com/killmenot/valid-data-url
+// Definitions by: jgeth <https://github.com/jgeth>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export as namespace validDataUrl;
+
+declare const validDataUrl: {
+    (candidate: string): boolean;
+    regex: RegExp;
+};
+
+export = validDataUrl;

types/valid-data-url/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "valid-data-url-tests.ts"
+    ]
+}

types/valid-data-url/tslint.json

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

types/valid-data-url/valid-data-url-tests.ts

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+import * as validDataUrl from "valid-data-url";
+
+validDataUrl("data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D");