diff --git a/x-pack/typings/mocha.d.ts b/x-pack/typings/mocha.d.ts
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+/* tslint:disable */
+// Type definitions for mocha 5.2
+// Project: http://mochajs.org/
+// Definitions by: Kazi Manzur Rashid <https://github.com/kazimanzurrashid>
+//                 otiai10 <https://github.com/otiai10>
+//                 jt000 <https://github.com/jt000>
+//                 Vadim Macagon <https://github.com/enlight>
+//                 Andrew Bradley <https://github.com/cspotcode>
+//                 Dmitrii Sorin <https://github.com/1999>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+declare namespace Mocha {
+
+
+  // #region Test interface augmentations
+
+  interface HookFunction {
+    /**
+     * [bdd, qunit, tdd] Describe a "hook" to execute the given callback `fn`. The name of the
+     * function is used as the name of the hook.
+     *
+     * - _Only available when invoked via the mocha CLI._
+     */
+    (fn: any): void;
+
+    /**
+     * [bdd, qunit, tdd] Describe a "hook" to execute the given callback `fn`. The name of the
+     * function is used as the name of the hook.
+     *
+     * - _Only available when invoked via the mocha CLI._
+     */
+    (fn: any): void;
+
+    /**
+     * [bdd, qunit, tdd] Describe a "hook" to execute the given `title` and callback `fn`.
+     *
+     * - _Only available when invoked via the mocha CLI._
+     */
+    (name: string, fn?: any): void;
+
+    /**
+     * [bdd, qunit, tdd] Describe a "hook" to execute the given `title` and callback `fn`.
+     *
+     * - _Only available when invoked via the mocha CLI._
+     */
+    (name: string, fn?: any): void;
+  }
+
+  /**
+   * Execute after running tests.
+   *
+   * - _Only available when invoked via the mocha CLI._
+   *
+   * @see https://mochajs.org/api/global.html#after
+   */
+  let after: HookFunction;
+
+
+  /**
+   * Execute before running tests.
+   *
+   * - _Only available when invoked via the mocha CLI._
+   *
+   * @see https://mochajs.org/api/global.html#before
+   */
+  let before: HookFunction;
+}
+
+declare module "mocha" {
+  export = Mocha;
+}
+
+declare const before: Mocha.HookFunction;
+declare const after: Mocha.HookFunction;
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