Added definitions for KyleAMathews/deepmerge (#13752)

deepmerge/deepmerge-tests.ts

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+import * as deepmerge from "deepmerge";
+
+const x = { foo: { bar: 3 },
+  array: [ { does: 'work', too: [ 1, 2, 3 ] } ] }
+const y = { foo: { baz: 4 },
+  quux: 5,
+  array: [ { does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' } ] }
+
+const expected = { foo: { bar: 3, baz: 4 },
+  array: [ { does: 'work', too: [ 1, 2, 3, 4, 5, 6 ] }, { really: 'yes' } ],
+  quux: 5 }
+
+const result = deepmerge<Object>(x, y);

deepmerge/index.d.ts

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+// Type definitions for deepmerge 1.3
+// Project: https://github.com/KyleAMathews/deepmerge
+// Definitions by: marvinscharle <https://github.com/marvinscharle>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = deepmerge;
+
+declare function deepmerge<T>(x: T, y: T, options?: deepmerge.Options<T>): T;
+
+declare namespace deepmerge {
+    interface Options<T> {
+        clone?: boolean;
+        arrayMerge?: (destination: T, source: T, options?: Options<T>) => T;
+    }
+
+    function all<T>(objects: T[], options?: Options<T>): T;
+}

deepmerge/tsconfig.json

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

deepmerge/tslint.json

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+{ "extends": "../tslint.json" }