Init commit.

@types/deep-eql/index.d.ts

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+declare namespace deepEqual {
+    /**
+     * Memoization class used to speed up comparison.
+     */
+    class MemoizeMap extends WeakMap<object, MemoizeMap | boolean> {}
+
+    interface DeepEqualOptions<T1 = unknown, T2 = unknown> {
+        /**
+         * Override default algorithm, determining custom equality.
+         */
+        comparator?: (leftHandOperand: T1, rightHandOperand: T2) => boolean | null;
+
+        /**
+         * Provide a custom memoization object which will cache the results of
+         * complex objects for a speed boost.
+         *
+         * By passing `false` you can disable memoization, but this will cause circular
+         * references to blow the stack.
+         */
+        memoize?: MemoizeMap | false;
+    }
+}
+
+/**
+ * Assert deeply nested sameValue equality between two objects of any type.
+ *
+ * @param leftHandOperand
+ * @param rightHandOperand
+ * @param [options] Additional options
+ * @return equal match
+ */
+declare function deepEqual<T1, T2>(
+    leftHandOperand: T1,
+    rightHandOperand: T2,
+    options?: deepEqual.DeepEqualOptions<T1, T2>,
+): boolean;
+
+export = deepEqual;