diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index e4cbe323c68..4ddf6213ee7 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -1539,7 +1539,7 @@ interface Int8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -1812,7 +1812,7 @@ interface Uint8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2086,7 +2086,7 @@ interface Uint8ClampedArray {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2359,7 +2359,7 @@ interface Int16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2633,7 +2633,7 @@ interface Uint16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2906,7 +2906,7 @@ interface Int32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3179,7 +3179,7 @@ interface Uint32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3452,7 +3452,7 @@ interface Float32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3726,7 +3726,7 @@ interface Float64Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
 
     /**
       * Performs the specified action for each element in an array.