diff --git a/CHANGELOG.md b/CHANGELOG.md
index 051223fb642..ef7963857e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 - Fixed `EuiComboBox` always showing a scrollbar ([#3744](https://github.com/elastic/eui/pull/3744))
 - Replaced `react-focus-lock` with `react-focus-on` ([#3631](https://github.com/elastic/eui/pull/3631))
 - Fixed errors in `EuiSuperDatePicker` related to invalid and `null` date formatting ([#3750](https://github.com/elastic/eui/pull/3750))
+- Fixed type definitions for `findTestSubject` and `takeMountedSnapshot` ([#3763](https://github.com/elastic/eui/pull/3763))
 
 ## [`27.1.0`](https://github.com/elastic/eui/tree/v27.1.0)
 
diff --git a/src/test/find_test_subject.ts b/src/test/find_test_subject.ts
index 020ff7c27b2..4ea93bea4e6 100644
--- a/src/test/find_test_subject.ts
+++ b/src/test/find_test_subject.ts
@@ -19,12 +19,6 @@
 
 import { ReactWrapper, ShallowWrapper } from 'enzyme';
 
-type FindTestSubject<T extends ShallowWrapper | ReactWrapper> = (
-  mountedComponent: T,
-  testSubjectSelector: string,
-  matcher?: '=' | '~=' | '|=' | '^=' | '$=' | '*='
-) => ReturnType<T['find']>;
-
 /**
  * Find node which matches a specific test subject selector. Returns ReactWrappers around DOM element,
  * https://github.com/airbnb/enzyme/tree/master/docs/api/ReactWrapper.
@@ -42,13 +36,17 @@ const MATCHERS = [
   '^=', // Begins with substring
   '$=', // Ends with substring
   '*=', // Contains substring
-];
+] as const;
+
+type FindTestSubject<T extends ShallowWrapper | ReactWrapper> = (
+  mountedComponent: T,
+  testSubjectSelector: string,
+  matcher?: typeof MATCHERS[number]
+) => ReturnType<T['find']>;
 
-export const findTestSubject: FindTestSubject<ShallowWrapper | ReactWrapper> = (
-  mountedComponent,
-  testSubjectSelector,
-  matcher = '~='
-) => {
+export const findTestSubject: FindTestSubject<
+  ShallowWrapper<any> | ReactWrapper<any>
+> = (mountedComponent, testSubjectSelector, matcher = '~=') => {
   if (!MATCHERS.includes(matcher)) {
     throw new Error(
       `Matcher ${matcher} not found in list of allowed matchers: ${MATCHERS.join(
diff --git a/src/test/take_mounted_snapshot.ts b/src/test/take_mounted_snapshot.ts
index a845b81b4e8..e0cbee8f64a 100644
--- a/src/test/take_mounted_snapshot.ts
+++ b/src/test/take_mounted_snapshot.ts
@@ -31,7 +31,7 @@ interface TakeMountedSnapshotOptions {
  * leaving only HTML elements in the snapshot.
  */
 export const takeMountedSnapshot = (
-  mountedComponent: ReactWrapper<{}, {}, Component>,
+  mountedComponent: ReactWrapper<any, {}, Component>,
   options: TakeMountedSnapshotOptions = {}
 ) => {
   const opts: TakeMountedSnapshotOptions = {