diff --git a/lib/node.js b/lib/node.js
index dda05cc2f60..3aae34b0303 100644
--- a/lib/node.js
+++ b/lib/node.js
@@ -2216,6 +2216,26 @@ declare module "zlib" {
 
 declare module "assert" {
   declare class AssertionError extends Error {}
+  declare type AssertStrict = {
+    (value: any, message?: string): void;
+    ok(value: any, message?: string): void;
+    fail(message?: string | Error): void;
+    // deprecated since v10.15
+    fail(actual: any, expected: any, message: string, operator: string): void;
+    equal(actual: any, expected: any, message?: string): void;
+    notEqual(actual: any, expected: any, message?: string): void;
+    deepEqual(actual: any, expected: any, message?: string): void;
+    notDeepEqual(actual: any, expected: any, message?: string): void;
+    throws(
+      block: Function,
+      error?: Function | RegExp | (err: any) => boolean,
+      message?: string
+    ): void;
+    doesNotThrow(block: Function, message?: string): void;
+    ifError(value: any): void;
+    AssertionError: typeof AssertionError;
+    strict: AssertStrict;
+  }
   declare module.exports: {
     (value: any, message?: string): void;
     ok(value: any, message?: string): void;
@@ -2238,6 +2258,7 @@ declare module "assert" {
     doesNotThrow(block: Function, message?: string): void;
     ifError(value: any): void;
     AssertionError: typeof AssertionError;
+    strict: AssertStrict;
   }
 }