bug(esnext) add overloads for flatten

Author: benbraou

src/lib/esnext.array.d.ts

@@ -41,11 +41,75 @@ interface Array<T> {
         thisArg?: This
     ): U[]
 
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][][][][][][], depth: 7): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][][][][][], depth: 6): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][][][][], depth: 5): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][][][], depth: 4): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][][], depth: 3): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][][], depth: 2): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[][], depth?: 1): U[];
+
+    /**
+     * Returns a new array with all sub-array elements concatenated into it recursively up to the
+     * specified depth.
+     *
+     * @param depth The maximum recursion depth
+     */
+    flatten<U>(this: U[], depth: 0): U[];
+
     /**
      * Returns a new array with all sub-array elements concatenated into it recursively up to the
      * specified depth. If no depth is provided, flatten method defaults to the depth of 1.
      *
      * @param depth The maximum recursion depth
      */
-    flatten<U>(this: U[], depth?: number): U[];
+    flatten<U>(depth?: number): any[];
 }