From b2209b605ac9011d7b7df1dea326158c5f41415f Mon Sep 17 00:00:00 2001
From: Guilhem Soulas <g@soulas.net>
Date: Wed, 14 Dec 2016 22:02:12 +0000
Subject: [PATCH] [lodash] add type guards to isNull, isUndefined, isNil

---
 lodash/index.d.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lodash/index.d.ts b/lodash/index.d.ts
index bf19508fa6..db882d5c51 100644
--- a/lodash/index.d.ts
+++ b/lodash/index.d.ts
@@ -12310,7 +12310,7 @@ declare module _ {
          * _.isNil(NaN);
          * // => false
          */
-        isNil(value?: any): boolean;
+        isNil(value: any): value is null | undefined;
     }
 
     interface LoDashImplicitWrapperBase<T, TWrapper> {
@@ -12335,7 +12335,7 @@ declare module _ {
          * @param value The value to check.
          * @return Returns true if value is null, else false.
          */
-        isNull(value?: any): boolean;
+        isNull(value: any): value is null;
     }
 
     interface LoDashImplicitWrapperBase<T, TWrapper> {
@@ -12662,7 +12662,7 @@ declare module _ {
          * @param value The value to check.
          * @return Returns true if value is undefined, else false.
          */
-        isUndefined(value: any): boolean;
+        isUndefined(value: any): value is undefined;
     }
 
     interface LoDashImplicitWrapperBase<T, TWrapper> {