diff --git a/hardware-concurrency/hardware-concurrency.test.js b/hardware-concurrency/hardware-concurrency.test.js
index 8b9f542..1dede29 100644
--- a/hardware-concurrency/hardware-concurrency.test.js
+++ b/hardware-concurrency/hardware-concurrency.test.js
@@ -16,10 +16,14 @@
 
 import { renderHook } from '@testing-library/react-hooks';
 
-import { useHardwareConcurrency } from './';
+afterEach(function() {
+  // Reload hook for every test
+  jest.resetModules();
+});
 
 describe('useHardwareConcurrency', () => {
   test(`should return window.navigator.hardwareConcurrency`, () => {
+    const { useHardwareConcurrency } = require('./');
     const { result } = renderHook(() => useHardwareConcurrency());
     expect(result.current.numberOfLogicalProcessors).toBe(window.navigator.hardwareConcurrency);
   });
@@ -30,6 +34,7 @@ describe('useHardwareConcurrency', () => {
       configurable: true,
       writable: true
     });
+    const { useHardwareConcurrency } = require('./');
     const { result } = renderHook(() => useHardwareConcurrency());
 
     expect(result.current.numberOfLogicalProcessors).toEqual(4);
@@ -41,6 +46,7 @@ describe('useHardwareConcurrency', () => {
       configurable: true,
       writable: true
     });
+    const { useHardwareConcurrency } = require('./');
     const { result } = renderHook(() => useHardwareConcurrency());
 
     expect(result.current.numberOfLogicalProcessors).toEqual(2);
diff --git a/hardware-concurrency/index.js b/hardware-concurrency/index.js
index c75962a..15d2dff 100644
--- a/hardware-concurrency/index.js
+++ b/hardware-concurrency/index.js
@@ -14,19 +14,14 @@
  * limitations under the License.
  */
 
-import { useState } from 'react';
-
+let initialHardwareConcurrency;
+if (typeof navigator !== 'undefined' && 'hardwareConcurrency' in navigator) {
+  initialHardwareConcurrency = { numberOfLogicalProcessors: navigator.hardwareConcurrency };
+} else {
+  initialHardwareConcurrency = { unsupported: true };
+}
 const useHardwareConcurrency = () => {
-  let initialHardwareConcurrency;
-  if ('hardwareConcurrency' in navigator) {
-    initialHardwareConcurrency = {numberOfLogicalProcessors: navigator.hardwareConcurrency};
-  } else {
-    initialHardwareConcurrency = {unsupported: true};
-  }
-
-  const [hardwareConcurrency] = useState(initialHardwareConcurrency);
-
-  return { ...hardwareConcurrency };
+  return { ...initialHardwareConcurrency };
 };
 
 export { useHardwareConcurrency };
diff --git a/memory/index.js b/memory/index.js
index daf67fb..d45a946 100644
--- a/memory/index.js
+++ b/memory/index.js
@@ -14,33 +14,27 @@
  * limitations under the License.
  */
 
-import { useState } from 'react';
-
 let unsupported;
+if (typeof navigator !== 'undefined' && 'deviceMemory' in navigator) {
+  unsupported = false;
+} else {
+  unsupported = true;
+}
+let initialMemoryStatus;
+if (!unsupported) {
+  const performanceMemory = 'memory' in performance ? performance.memory : null;
+  initialMemoryStatus = {
+    deviceMemory: navigator.deviceMemory,
+    totalJSHeapSize: performanceMemory ? performanceMemory.totalJSHeapSize : null,
+    usedJSHeapSize: performanceMemory ? performanceMemory.usedJSHeapSize : null,
+    jsHeapSizeLimit: performanceMemory ? performanceMemory.jsHeapSizeLimit : null
+  };
+} else {
+  initialMemoryStatus = { unsupported };
+}
 
 const useMemoryStatus = () => {
-  if ('deviceMemory' in navigator) {
-    unsupported = false;
-  } else {
-    unsupported = true;
-  }
-
-  let initialMemoryStatus;
-  if (!unsupported) {
-    const performanceMemory = ('memory' in performance) ? performance.memory : null;
-    initialMemoryStatus = {
-      deviceMemory: navigator.deviceMemory,
-      totalJSHeapSize: performanceMemory ? performanceMemory.totalJSHeapSize : null,
-      usedJSHeapSize: performanceMemory ? performanceMemory.usedJSHeapSize : null,
-      jsHeapSizeLimit: performanceMemory ? performanceMemory.jsHeapSizeLimit : null
-    };
-  } else {
-    initialMemoryStatus = {unsupported};
-  }
-
-  const [memoryStatus] = useState(initialMemoryStatus);
-
-  return { ...memoryStatus };
+  return { ...initialMemoryStatus };
 };
 
 export { useMemoryStatus };
diff --git a/memory/memory.test.js b/memory/memory.test.js
index 155c79a..febfaae 100644
--- a/memory/memory.test.js
+++ b/memory/memory.test.js
@@ -16,7 +16,10 @@
 
 import { renderHook } from '@testing-library/react-hooks';
 
-import { useMemoryStatus } from './';
+afterEach(function() {
+  // Reload hook for every test
+  jest.resetModules();
+});
 
 const getMemoryStatus = currentResult => ({
   deviceMemory: currentResult.deviceMemory,
@@ -27,6 +30,7 @@ const getMemoryStatus = currentResult => ({
 
 describe('useMemoryStatus', () => {
   test(`should return "true" for unsupported case`, () => {
+    const { useMemoryStatus } = require('./');
     const { result } = renderHook(() => useMemoryStatus());
 
     expect(result.current.unsupported).toBe(true);
@@ -48,6 +52,7 @@ describe('useMemoryStatus', () => {
       jsHeapSizeLimit: mockMemoryStatus.jsHeapSizeLimit
     };
 
+    const { useMemoryStatus } = require('./');
     const { result } = renderHook(() => useMemoryStatus());
 
     expect(getMemoryStatus(result.current)).toEqual(mockMemoryStatus);
diff --git a/save-data/index.js b/save-data/index.js
index dc2cd26..bdc63dd 100644
--- a/save-data/index.js
+++ b/save-data/index.js
@@ -14,20 +14,16 @@
  * limitations under the License.
  */
 
-import { useState } from 'react';
-
 let unsupported;
+if ('connection' in navigator && 'saveData' in navigator.connection) {
+  unsupported = false;
+} else {
+  unsupported = true;
+}
 
-const useSaveData = () => {
-  if ('connection' in navigator && 'saveData' in navigator.connection) {
-    unsupported = false;
-  } else {
-    unsupported = true;
-  }
-
-  const initialSaveData = unsupported ? null : navigator.connection.saveData === true;
-  const [saveData] = useState(initialSaveData);
+const saveData = unsupported ? null : navigator.connection.saveData === true;
 
+const useSaveData = () => {
   return { unsupported, saveData };
 };
 
diff --git a/save-data/save-data.test.js b/save-data/save-data.test.js
index 13aa632..541cbb7 100644
--- a/save-data/save-data.test.js
+++ b/save-data/save-data.test.js
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2019 Google LLC
  *
@@ -16,10 +15,15 @@
  */
 
 import { renderHook, act } from '@testing-library/react-hooks';
-import { useSaveData } from './';
+
+afterEach(function() {
+  // Reload hook for every test
+  jest.resetModules();
+});
 
 describe('useSaveData', () => {
   test(`should return "true" for unsupported case`, () => {
+    const { useSaveData } = require('./');
     const { result } = renderHook(() => useSaveData());
     expect(result.current.unsupported).toBe(true);
   });
@@ -28,6 +32,7 @@ describe('useSaveData', () => {
     global.navigator.connection = {
       saveData: true
     };
+    const { useSaveData } = require('./');
     const { result } = renderHook(() => useSaveData());
 
     expect(result.current.saveData).toEqual(navigator.connection.saveData);
@@ -37,6 +42,7 @@ describe('useSaveData', () => {
     global.navigator.connection = {
       saveData: false
     };
+    const { useSaveData } = require('./');
     const { result } = renderHook(() => useSaveData());
 
     expect(result.current.saveData).toEqual(navigator.connection.saveData);