diff --git a/.eslintrc.js b/.eslintrc.js
index e478d069592..96319456870 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -82,9 +82,11 @@ module.exports = {
 					'logout_uri',
 					'id_token',
 					'access_token',
+					'refresh_token',
 					'token_type',
 					'expires_in',
 					'error_description',
+					'error_message',
 					// exceptions for the notifications package
 					'campaign_id',
 					'delivery_type',
diff --git a/packages/auth/__tests__/mockData.ts b/packages/auth/__tests__/mockData.ts
index eacbf143eb6..9edfd45a197 100644
--- a/packages/auth/__tests__/mockData.ts
+++ b/packages/auth/__tests__/mockData.ts
@@ -1,6 +1,3 @@
-// keeping this so that jest does not complain
-test('should do nothing', () => {});
-
 // device tracking mock device data
 export const mockDeviceArray = [
 	{
diff --git a/packages/auth/__tests__/providers/cognito/assertServiceError.test.ts b/packages/auth/__tests__/providers/cognito/assertServiceError.test.ts
index 84ddeae7006..d17f8234b12 100644
--- a/packages/auth/__tests__/providers/cognito/assertServiceError.test.ts
+++ b/packages/auth/__tests__/providers/cognito/assertServiceError.test.ts
@@ -8,7 +8,9 @@ describe('asserts service errors', () => {
 	test('it should throw an unknown error when error is null', () => {
 		try {
 			const error = null;
-			expect(assertServiceError(error)).toThrow();
+			expect(() => {
+				assertServiceError(error);
+			}).toThrow();
 		} catch (error: any) {
 			expect(error).toBeInstanceOf(AuthError);
 			expect(error.name).toBe(AmplifyErrorCode.Unknown);
@@ -17,7 +19,9 @@ describe('asserts service errors', () => {
 	test('it should throw an unknown error when error is a TypeError', () => {
 		try {
 			const error = new TypeError('TypeError');
-			expect(assertServiceError(error)).toThrow();
+			expect(() => {
+				assertServiceError(error);
+			}).toThrow();
 		} catch (error: any) {
 			expect(error).toBeInstanceOf(AuthError);
 			expect(error.name).toBe(AmplifyErrorCode.Unknown);
@@ -26,7 +30,9 @@ describe('asserts service errors', () => {
 	test('it should throw an unknown error when error does not have a name', () => {
 		try {
 			const error = new Error('Error');
-			expect(assertServiceError(error)).toThrow();
+			expect(() => {
+				assertServiceError(error);
+			}).toThrow();
 		} catch (error: any) {
 			expect(error).toBeInstanceOf(AuthError);
 			expect(error.name).toBe(AmplifyErrorCode.Unknown);
@@ -35,6 +41,8 @@ describe('asserts service errors', () => {
 	test('it should not throw if the error is coming from the service', () => {
 		const error = new Error('Service Error');
 		error.name = InitiateAuthException.InternalErrorException;
-		expect(assertServiceError(error)).toBeUndefined();
+		expect(() => {
+			assertServiceError(error);
+		}).not.toThrow();
 	});
 });
diff --git a/packages/auth/__tests__/providers/cognito/confirmResetPassword.test.ts b/packages/auth/__tests__/providers/cognito/confirmResetPassword.test.ts
index e786546edf9..df8167e5030 100644
--- a/packages/auth/__tests__/providers/cognito/confirmResetPassword.test.ts
+++ b/packages/auth/__tests__/providers/cognito/confirmResetPassword.test.ts
@@ -44,9 +44,9 @@ describe('confirmResetPassword', () => {
 	});
 
 	it('should call the confirmForgotPassword and return void', async () => {
-		expect(
-			await confirmResetPassword(authAPITestParams.confirmResetPasswordRequest),
-		).toBeUndefined();
+		await expect(
+			confirmResetPassword(authAPITestParams.confirmResetPasswordRequest),
+		).resolves.toBeUndefined();
 		expect(mockConfirmForgotPassword).toHaveBeenCalled();
 	});
 
@@ -137,7 +137,7 @@ describe('confirmResetPassword', () => {
 	});
 
 	it('should add UserContextData', async () => {
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -164,6 +164,6 @@ describe('confirmResetPassword', () => {
 				},
 			}),
 		);
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 });
diff --git a/packages/auth/__tests__/providers/cognito/confirmSignInHappyCases.test.ts b/packages/auth/__tests__/providers/cognito/confirmSignInHappyCases.test.ts
index d5e84e09339..c716ee76df8 100644
--- a/packages/auth/__tests__/providers/cognito/confirmSignInHappyCases.test.ts
+++ b/packages/auth/__tests__/providers/cognito/confirmSignInHappyCases.test.ts
@@ -32,7 +32,7 @@ const authConfig = {
 const mockedGetCurrentUser = getCurrentUser as jest.Mock;
 
 describe('confirmSignIn API happy path cases', () => {
-	let handleChallengeNameSpy;
+	let handleChallengeNameSpy: jest.SpyInstance;
 	const { username } = authAPITestParams.user1;
 	const { password } = authAPITestParams.user1;
 
@@ -276,8 +276,8 @@ describe('confirmSignIn API happy path cases', () => {
 });
 
 describe('Cognito ASF', () => {
-	let respondToAuthChallengeSpy;
-	let handleUserSRPAuthFlowSpy;
+	let respondToAuthChallengeSpy: jest.SpyInstance;
+	let handleUserSRPAuthFlowSpy: jest.SpyInstance;
 
 	const { username } = authAPITestParams.user1;
 	const { password } = authAPITestParams.user1;
@@ -287,7 +287,7 @@ describe('Cognito ASF', () => {
 		});
 
 		// load Cognito ASF polyfill
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -318,7 +318,7 @@ describe('Cognito ASF', () => {
 	afterEach(() => {
 		respondToAuthChallengeSpy.mockClear();
 		handleUserSRPAuthFlowSpy.mockClear();
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 
 	afterAll(() => {
@@ -415,16 +415,14 @@ describe('Cognito ASF', () => {
 		Amplify.configure({
 			Auth: authConfig,
 		});
-		const handleUserSRPAuthflowSpy = jest
-			.spyOn(signInHelpers, 'handleUserSRPAuthFlow')
-			.mockImplementationOnce(
-				async (): Promise<RespondToAuthChallengeCommandOutput> => ({
-					ChallengeName: 'SOFTWARE_TOKEN_MFA',
-					Session: '1234234232',
-					$metadata: {},
-					ChallengeParameters: {},
-				}),
-			);
+		jest.spyOn(signInHelpers, 'handleUserSRPAuthFlow').mockImplementationOnce(
+			async (): Promise<RespondToAuthChallengeCommandOutput> => ({
+				ChallengeName: 'SOFTWARE_TOKEN_MFA',
+				Session: '1234234232',
+				$metadata: {},
+				ChallengeParameters: {},
+			}),
+		);
 
 		const result = await signIn({ username, password });
 
@@ -460,16 +458,14 @@ describe('Cognito ASF', () => {
 		Amplify.configure({
 			Auth: authConfig,
 		});
-		const handleUserSRPAuthflowSpy = jest
-			.spyOn(signInHelpers, 'handleUserSRPAuthFlow')
-			.mockImplementationOnce(
-				async (): Promise<RespondToAuthChallengeCommandOutput> => ({
-					ChallengeName: 'NEW_PASSWORD_REQUIRED',
-					Session: '1234234232',
-					$metadata: {},
-					ChallengeParameters: {},
-				}),
-			);
+		jest.spyOn(signInHelpers, 'handleUserSRPAuthFlow').mockImplementationOnce(
+			async (): Promise<RespondToAuthChallengeCommandOutput> => ({
+				ChallengeName: 'NEW_PASSWORD_REQUIRED',
+				Session: '1234234232',
+				$metadata: {},
+				ChallengeParameters: {},
+			}),
+		);
 
 		const result = await signIn({ username, password });
 
@@ -506,16 +502,14 @@ describe('Cognito ASF', () => {
 		Amplify.configure({
 			Auth: authConfig,
 		});
-		const handleUserSRPAuthflowSpy = jest
-			.spyOn(signInHelpers, 'handleUserSRPAuthFlow')
-			.mockImplementationOnce(
-				async (): Promise<RespondToAuthChallengeCommandOutput> => ({
-					ChallengeName: 'CUSTOM_CHALLENGE',
-					Session: '1234234232',
-					$metadata: {},
-					ChallengeParameters: {},
-				}),
-			);
+		jest.spyOn(signInHelpers, 'handleUserSRPAuthFlow').mockImplementationOnce(
+			async (): Promise<RespondToAuthChallengeCommandOutput> => ({
+				ChallengeName: 'CUSTOM_CHALLENGE',
+				Session: '1234234232',
+				$metadata: {},
+				ChallengeParameters: {},
+			}),
+		);
 
 		const result = await signIn({ username, password });
 
diff --git a/packages/auth/__tests__/providers/cognito/confirmSignUp.test.ts b/packages/auth/__tests__/providers/cognito/confirmSignUp.test.ts
index 68bd5b27031..e6528e4b1ed 100644
--- a/packages/auth/__tests__/providers/cognito/confirmSignUp.test.ts
+++ b/packages/auth/__tests__/providers/cognito/confirmSignUp.test.ts
@@ -144,7 +144,7 @@ describe('confirmSignUp', () => {
 	});
 
 	it('should send UserContextData', async () => {
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -171,6 +171,6 @@ describe('confirmSignUp', () => {
 			},
 		);
 		expect(mockConfirmSignUp).toHaveBeenCalledTimes(1);
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 });
diff --git a/packages/auth/__tests__/providers/cognito/credentialsProvider.test.ts b/packages/auth/__tests__/providers/cognito/credentialsProvider.test.ts
index e2ed6141927..3390e14a052 100644
--- a/packages/auth/__tests__/providers/cognito/credentialsProvider.test.ts
+++ b/packages/auth/__tests__/providers/cognito/credentialsProvider.test.ts
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import {
-	GetCredentialsForIdentityInput,
 	GetCredentialsForIdentityOutput,
 	ResourcesConfig,
 	getCredentialsForIdentity,
@@ -75,11 +74,9 @@ describe('Guest Credentials', () => {
 				new CognitoAWSCredentialsAndIdentityIdProvider(
 					new DefaultIdentityIdStore(sharedInMemoryStorage),
 				);
-			credentialsForIdentityIdSpy.mockImplementationOnce(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.CredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementationOnce(async () => {
+				return authAPITestParams.CredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 		});
 		afterEach(() => {
 			cognitoCredentialsProvider.clearCredentials();
@@ -101,9 +98,10 @@ describe('Guest Credentials', () => {
 				{ IdentityId: 'identity-id-test' },
 			);
 			expect(
-				cognitoCredentialsProvider._nextCredentialsRefresh,
+				(cognitoCredentialsProvider as any)._nextCredentialsRefresh,
 			).toBeGreaterThan(0);
 		});
+
 		test('in-memory guest creds are returned if not expired and not past TTL', async () => {
 			await cognitoCredentialsProvider.getCredentialsAndIdentityId({
 				authenticated: false,
@@ -122,19 +120,18 @@ describe('Guest Credentials', () => {
 			expect(credentialsForIdentityIdSpy).toHaveBeenCalledTimes(1);
 		});
 	});
+
 	describe('Error Path Cases:', () => {
-		let cognitoCredentialsProvider;
 		beforeEach(() => {
 			cognitoCredentialsProvider =
 				new CognitoAWSCredentialsAndIdentityIdProvider(
 					new DefaultIdentityIdStore(sharedInMemoryStorage),
 				);
-			credentialsForIdentityIdSpy.mockImplementationOnce(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.NoAccessKeyCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementationOnce(async () => {
+				return authAPITestParams.NoAccessKeyCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 		});
+
 		afterEach(() => {
 			cognitoCredentialsProvider.clearCredentials();
 		});
@@ -161,18 +158,16 @@ describe('Guest Credentials', () => {
 });
 
 describe('Primary Credentials', () => {
-	let cognitoCredentialsProvider;
+	let cognitoCredentialsProvider: CognitoAWSCredentialsAndIdentityIdProvider;
 	describe('Happy Path Cases:', () => {
 		beforeEach(() => {
 			cognitoCredentialsProvider =
 				new CognitoAWSCredentialsAndIdentityIdProvider(
 					new DefaultIdentityIdStore(sharedInMemoryStorage),
 				);
-			credentialsForIdentityIdSpy.mockImplementation(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.CredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementation(async () => {
+				return authAPITestParams.CredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 		});
 		afterEach(() => {
 			cognitoCredentialsProvider.clearCredentials();
@@ -184,7 +179,7 @@ describe('Primary Credentials', () => {
 				authConfig: validAuthConfig.Auth!,
 				tokens: authAPITestParams.ValidAuthTokens,
 			});
-			expect(res.credentials.accessKeyId).toEqual(
+			expect(res?.credentials.accessKeyId).toEqual(
 				authAPITestParams.CredentialsForIdentityIdResult.Credentials
 					.AccessKeyId,
 			);
@@ -210,7 +205,7 @@ describe('Primary Credentials', () => {
 				authConfig: validAuthConfig.Auth!,
 				tokens: authAPITestParams.ValidAuthTokens,
 			});
-			expect(res.credentials.accessKeyId).toEqual(
+			expect(res?.credentials.accessKeyId).toEqual(
 				authAPITestParams.CredentialsForIdentityIdResult.Credentials
 					.AccessKeyId,
 			);
@@ -231,7 +226,7 @@ describe('Primary Credentials', () => {
 			);
 			expect(credentialsForIdentityIdSpy).toHaveBeenCalledTimes(1);
 
-			const res = await cognitoCredentialsProvider.getCredentialsAndIdentityId({
+			await cognitoCredentialsProvider.getCredentialsAndIdentityId({
 				authenticated: true,
 				authConfig: validAuthConfig.Auth!,
 				tokens: authAPITestParams.NewValidAuthTokens,
@@ -259,11 +254,9 @@ describe('Primary Credentials', () => {
 			credentialsForIdentityIdSpy?.mockReset();
 		});
 		test('Should throw AuthError if either Credentials, accessKeyId or secretKey is absent in the response', async () => {
-			credentialsForIdentityIdSpy.mockImplementationOnce(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.NoAccessKeyCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementationOnce(async () => {
+				return authAPITestParams.NoAccessKeyCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 			expect(
 				cognitoCredentialsProvider.getCredentialsAndIdentityId({
 					authenticated: true,
@@ -272,11 +265,9 @@ describe('Primary Credentials', () => {
 				}),
 			).rejects.toThrow(AuthError);
 			credentialsForIdentityIdSpy.mockClear();
-			credentialsForIdentityIdSpy.mockImplementationOnce(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.NoCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementationOnce(async () => {
+				return authAPITestParams.NoCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 			expect(
 				cognitoCredentialsProvider.getCredentialsAndIdentityId({
 					authenticated: true,
@@ -285,11 +276,9 @@ describe('Primary Credentials', () => {
 				}),
 			).rejects.toThrow(AuthError);
 			credentialsForIdentityIdSpy.mockClear();
-			credentialsForIdentityIdSpy.mockImplementationOnce(
-				async ({}, params: GetCredentialsForIdentityInput) => {
-					return authAPITestParams.NoSecretKeyInCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
-				},
-			);
+			credentialsForIdentityIdSpy.mockImplementationOnce(async () => {
+				return authAPITestParams.NoSecretKeyInCredentialsForIdentityIdResult as GetCredentialsForIdentityOutput;
+			});
 			expect(
 				cognitoCredentialsProvider.getCredentialsAndIdentityId({
 					authenticated: true,
diff --git a/packages/auth/__tests__/providers/cognito/fetchAuthSession.test.ts b/packages/auth/__tests__/providers/cognito/fetchAuthSession.test.ts
index 5a1c3c0efed..84a28ffa420 100644
--- a/packages/auth/__tests__/providers/cognito/fetchAuthSession.test.ts
+++ b/packages/auth/__tests__/providers/cognito/fetchAuthSession.test.ts
@@ -8,7 +8,7 @@ import {
 } from '../../../src/providers/cognito';
 
 describe('fetchAuthSession behavior for IdentityPools only', () => {
-	let credentialsProviderSpy;
+	let credentialsProviderSpy: jest.SpyInstance;
 	afterEach(() => {
 		jest.resetAllMocks();
 		jest.clearAllMocks();
@@ -75,9 +75,8 @@ describe('fetchAuthSession behavior for IdentityPools only', () => {
 });
 
 describe('fetchAuthSession behavior for UserPools only', () => {
-	let tokenProviderSpy;
 	beforeEach(() => {
-		tokenProviderSpy = jest
+		jest
 			.spyOn(cognitoUserPoolsTokenProvider, 'getTokens')
 			.mockImplementation(async () => {
 				return {
diff --git a/packages/auth/__tests__/providers/cognito/fetchDevices.test.ts b/packages/auth/__tests__/providers/cognito/fetchDevices.test.ts
index 1d8b8e76b0b..1e8a48ab84e 100644
--- a/packages/auth/__tests__/providers/cognito/fetchDevices.test.ts
+++ b/packages/auth/__tests__/providers/cognito/fetchDevices.test.ts
@@ -42,6 +42,7 @@ describe('fetchDevices', () => {
 		name: 'deviceNameValue',
 		attributes: {
 			attributeName: 'attributeValue',
+			// eslint-disable-next-line camelcase
 			device_name: 'deviceNameValue',
 		},
 		createDate: date,
diff --git a/packages/auth/__tests__/providers/cognito/identityIdProvider.test.ts b/packages/auth/__tests__/providers/cognito/identityIdProvider.test.ts
index a17dbb7a8b1..2b8620c680d 100644
--- a/packages/auth/__tests__/providers/cognito/identityIdProvider.test.ts
+++ b/packages/auth/__tests__/providers/cognito/identityIdProvider.test.ts
@@ -47,17 +47,19 @@ describe('Cognito IdentityId Provider Happy Path Cases:', () => {
 	beforeAll(() => {
 		jest.spyOn(Amplify, 'getConfig').mockImplementationOnce(() => ampConfig);
 
-		mockGetId.mockImplementation(async (config: {}, params: GetIdInput) => {
-			if (params.Logins && Object.keys(params.Logins).length === 0) {
-				return {
-					IdentityId: authAPITestParams.GuestIdentityId.id,
-				} as GetIdOutput;
-			} else {
-				return {
-					IdentityId: authAPITestParams.PrimaryIdentityId.id,
-				} as GetIdOutput;
-			}
-		});
+		mockGetId.mockImplementation(
+			async (_config: object, params: GetIdInput) => {
+				if (params.Logins && Object.keys(params.Logins).length === 0) {
+					return {
+						IdentityId: authAPITestParams.GuestIdentityId.id,
+					} as GetIdOutput;
+				} else {
+					return {
+						IdentityId: authAPITestParams.PrimaryIdentityId.id,
+					} as GetIdOutput;
+				}
+			},
+		);
 	});
 
 	afterEach(() => {
diff --git a/packages/auth/__tests__/providers/cognito/refreshToken.test.ts b/packages/auth/__tests__/providers/cognito/refreshToken.test.ts
index b2e77a37559..86ac80a1fee 100644
--- a/packages/auth/__tests__/providers/cognito/refreshToken.test.ts
+++ b/packages/auth/__tests__/providers/cognito/refreshToken.test.ts
@@ -83,7 +83,7 @@ describe('refreshToken', () => {
 		});
 
 		it('should send UserContextData', async () => {
-			window.AmazonCognitoAdvancedSecurityData = {
+			(window as any).AmazonCognitoAdvancedSecurityData = {
 				getData() {
 					return 'abcd';
 				},
@@ -117,7 +117,7 @@ describe('refreshToken', () => {
 					UserContextData: { EncodedData: 'abcd' },
 				}),
 			);
-			window.AmazonCognitoAdvancedSecurityData = undefined;
+			(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 		});
 	});
 
@@ -156,8 +156,7 @@ describe('refreshToken', () => {
 		it('should throw an exception when cognito tokens are not available', async () => {
 			await expect(
 				refreshAuthTokens({
-					// @ts-ignore
-					tokens: {},
+					tokens: {} as any,
 					authConfig: {
 						Cognito: {
 							userPoolId: 'us-east-1_aaaaaaa',
diff --git a/packages/auth/__tests__/providers/cognito/resendSignUpCode.test.ts b/packages/auth/__tests__/providers/cognito/resendSignUpCode.test.ts
index 6dd5354157b..d723a69eda8 100644
--- a/packages/auth/__tests__/providers/cognito/resendSignUpCode.test.ts
+++ b/packages/auth/__tests__/providers/cognito/resendSignUpCode.test.ts
@@ -89,7 +89,7 @@ describe('resendSignUpCode', () => {
 	});
 
 	it('should send UserContextData', async () => {
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -111,6 +111,6 @@ describe('resendSignUpCode', () => {
 			},
 		);
 		expect(mockResendConfirmationCode).toHaveBeenCalledTimes(1);
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 });
diff --git a/packages/auth/__tests__/providers/cognito/resetPassword.test.ts b/packages/auth/__tests__/providers/cognito/resetPassword.test.ts
index 2da7cd7141f..3432ae17c0a 100644
--- a/packages/auth/__tests__/providers/cognito/resetPassword.test.ts
+++ b/packages/auth/__tests__/providers/cognito/resetPassword.test.ts
@@ -92,7 +92,7 @@ describe('resetPassword', () => {
 	});
 
 	it('should send UserContextData', async () => {
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -112,6 +112,6 @@ describe('resetPassword', () => {
 				UserContextData: { EncodedData: 'abcd' },
 			}),
 		);
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 });
diff --git a/packages/auth/__tests__/providers/cognito/signInWithCustomAuth.test.ts b/packages/auth/__tests__/providers/cognito/signInWithCustomAuth.test.ts
index f93854dc087..87828e427f8 100644
--- a/packages/auth/__tests__/providers/cognito/signInWithCustomAuth.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signInWithCustomAuth.test.ts
@@ -32,7 +32,7 @@ Amplify.configure({
 });
 cognitoUserPoolsTokenProvider.setAuthConfig(authConfig);
 describe('signIn API happy path cases', () => {
-	let handleCustomAuthFlowWithoutSRPSpy;
+	let handleCustomAuthFlowWithoutSRPSpy: jest.SpyInstance;
 
 	afterAll(() => {
 		jest.restoreAllMocks();
@@ -85,7 +85,7 @@ describe('signIn API happy path cases', () => {
 });
 
 describe('Cognito ASF', () => {
-	let initiateAuthSpy;
+	let initiateAuthSpy: jest.SpyInstance;
 
 	afterAll(() => {
 		jest.restoreAllMocks();
@@ -105,7 +105,7 @@ describe('Cognito ASF', () => {
 				}),
 			);
 		// load Cognito ASF polyfill
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -114,11 +114,11 @@ describe('Cognito ASF', () => {
 
 	afterEach(() => {
 		initiateAuthSpy.mockClear();
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 
 	test('signIn API should send UserContextData', async () => {
-		const result = await signIn({
+		await signIn({
 			username: authAPITestParams.user1.username,
 			options: {
 				authFlowType: 'CUSTOM_WITHOUT_SRP',
diff --git a/packages/auth/__tests__/providers/cognito/signInWithCustomSRPAuth.test.ts b/packages/auth/__tests__/providers/cognito/signInWithCustomSRPAuth.test.ts
index 2ab9d833dc8..108e928d683 100644
--- a/packages/auth/__tests__/providers/cognito/signInWithCustomSRPAuth.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signInWithCustomSRPAuth.test.ts
@@ -32,7 +32,7 @@ Amplify.configure({
 });
 
 describe('signIn API happy path cases', () => {
-	let handleCustomSRPAuthFlowSpy;
+	let handleCustomSRPAuthFlowSpy: jest.SpyInstance;
 
 	beforeEach(() => {
 		handleCustomSRPAuthFlowSpy = jest
@@ -92,7 +92,7 @@ describe('signIn API happy path cases', () => {
 });
 
 describe('Cognito ASF', () => {
-	let initiateAuthSpy;
+	let initiateAuthSpy: jest.SpyInstance;
 
 	afterAll(() => {
 		jest.restoreAllMocks();
@@ -109,7 +109,7 @@ describe('Cognito ASF', () => {
 				},
 			}));
 		// load Cognito ASF polyfill
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -118,7 +118,7 @@ describe('Cognito ASF', () => {
 
 	afterEach(() => {
 		initiateAuthSpy.mockClear();
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 
 	test('signIn API invoked with CUSTOM_WITH_SRP should send UserContextData', async () => {
diff --git a/packages/auth/__tests__/providers/cognito/signInWithRedirect.test.ts b/packages/auth/__tests__/providers/cognito/signInWithRedirect.test.ts
index 7ed3b3df197..8f91323319f 100644
--- a/packages/auth/__tests__/providers/cognito/signInWithRedirect.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signInWithRedirect.test.ts
@@ -33,14 +33,14 @@ jest.mock('@aws-amplify/core/internals/utils', () => ({
 	isBrowser: jest.fn(() => true),
 }));
 jest.mock('@aws-amplify/core', () => {
-	const { ADD_OAUTH_LISTENER } = jest.requireActual(
+	const { ADD_OAUTH_LISTENER: ACTUAL_ADD_OAUTH_LISTENER } = jest.requireActual(
 		'@aws-amplify/core/internals/utils',
 	);
 
 	return {
 		Amplify: {
 			getConfig: jest.fn(() => mockAuthConfigWithOAuth),
-			[ADD_OAUTH_LISTENER]: jest.fn(),
+			[ACTUAL_ADD_OAUTH_LISTENER]: jest.fn(),
 		},
 		ConsoleLogger: jest.fn(),
 	};
diff --git a/packages/auth/__tests__/providers/cognito/signInWithSRP.test.ts b/packages/auth/__tests__/providers/cognito/signInWithSRP.test.ts
index 43b5fe49aa3..c43e773f1d7 100644
--- a/packages/auth/__tests__/providers/cognito/signInWithSRP.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signInWithSRP.test.ts
@@ -256,7 +256,7 @@ describe('signIn API happy path cases', () => {
 });
 
 describe('Cognito ASF', () => {
-	let initiateAuthSpy;
+	let initiateAuthSpy: jest.SpyInstance;
 
 	beforeAll(() => {
 		jest.restoreAllMocks();
@@ -273,7 +273,7 @@ describe('Cognito ASF', () => {
 				},
 			}));
 		// load Cognito ASF polyfill
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -282,7 +282,7 @@ describe('Cognito ASF', () => {
 
 	afterEach(() => {
 		initiateAuthSpy.mockClear();
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 
 	test('signIn SRP should send UserContextData', async () => {
diff --git a/packages/auth/__tests__/providers/cognito/signInWithUserPassword.test.ts b/packages/auth/__tests__/providers/cognito/signInWithUserPassword.test.ts
index dc2e8daf77a..83f3a7d2813 100644
--- a/packages/auth/__tests__/providers/cognito/signInWithUserPassword.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signInWithUserPassword.test.ts
@@ -33,7 +33,7 @@ Amplify.configure({
 	Auth: authConfig,
 });
 describe('signIn API happy path cases', () => {
-	let handleUserPasswordFlowSpy;
+	let handleUserPasswordFlowSpy: jest.SpyInstance;
 
 	beforeEach(() => {
 		handleUserPasswordFlowSpy = jest
@@ -79,7 +79,7 @@ describe('signIn API happy path cases', () => {
 });
 
 describe('Cognito ASF', () => {
-	let initiateAuthSpy;
+	let initiateAuthSpy: jest.SpyInstance;
 
 	afterAll(() => {
 		jest.restoreAllMocks();
@@ -96,7 +96,7 @@ describe('Cognito ASF', () => {
 				},
 			}));
 		// load Cognito ASF polyfill
-		window.AmazonCognitoAdvancedSecurityData = {
+		(window as any).AmazonCognitoAdvancedSecurityData = {
 			getData() {
 				return 'abcd';
 			},
@@ -105,7 +105,7 @@ describe('Cognito ASF', () => {
 
 	afterEach(() => {
 		initiateAuthSpy.mockClear();
-		window.AmazonCognitoAdvancedSecurityData = undefined;
+		(window as any).AmazonCognitoAdvancedSecurityData = undefined;
 	});
 
 	test('signIn API should send UserContextData', async () => {
diff --git a/packages/auth/__tests__/providers/cognito/signOut.test.ts b/packages/auth/__tests__/providers/cognito/signOut.test.ts
index b211b273831..adae8c494cc 100644
--- a/packages/auth/__tests__/providers/cognito/signOut.test.ts
+++ b/packages/auth/__tests__/providers/cognito/signOut.test.ts
@@ -33,6 +33,7 @@ jest.mock('../../../src/providers/cognito/utils/signInWithRedirectStore');
 jest.mock('../../../src/utils');
 
 describe('signOut', () => {
+	// eslint-disable-next-line camelcase
 	const accessToken = { payload: { origin_jti: 'revocation-id' } };
 	const region = 'us-west-2';
 	const cognitoConfig = {
diff --git a/packages/auth/__tests__/providers/cognito/tokenOrchestrator.test.ts b/packages/auth/__tests__/providers/cognito/tokenOrchestrator.test.ts
index 323aaa59bbd..ad15fc2a540 100644
--- a/packages/auth/__tests__/providers/cognito/tokenOrchestrator.test.ts
+++ b/packages/auth/__tests__/providers/cognito/tokenOrchestrator.test.ts
@@ -143,7 +143,7 @@ describe('TokenOrchestrator', () => {
 			mockAuthTokenStore.loadTokens.mockResolvedValue(validAuthTokens);
 			(oAuthStore.loadOAuthInFlight as jest.Mock).mockResolvedValue(true);
 
-			expect(await tokenOrchestrator.getTokens()).resolves;
+			await tokenOrchestrator.getTokens();
 
 			expect(addInflightPromise).toHaveBeenCalledWith(expect.any(Function));
 			expect(mockAddInflightPromise).toHaveBeenCalledTimes(1);
diff --git a/packages/auth/__tests__/providers/cognito/tokenProvider/tokenOrchestrator.test.ts b/packages/auth/__tests__/providers/cognito/tokenProvider/tokenOrchestrator.test.ts
index 5e1e944b0b5..e1c25ec86f7 100644
--- a/packages/auth/__tests__/providers/cognito/tokenProvider/tokenOrchestrator.test.ts
+++ b/packages/auth/__tests__/providers/cognito/tokenProvider/tokenOrchestrator.test.ts
@@ -66,8 +66,8 @@ describe('tokenOrchestrator', () => {
 				username: testUsername,
 			};
 			mockTokenRefresher.mockResolvedValueOnce(mockTokens);
-			mockTokenStore.storeTokens.mockResolvedValue(void 0);
-			const newTokens = await tokenOrchestrator.refreshTokens({
+			mockTokenStore.storeTokens.mockResolvedValue(undefined);
+			const newTokens = await (tokenOrchestrator as any).refreshTokens({
 				tokens: testInputTokens,
 				username: testUsername,
 			});
diff --git a/packages/auth/__tests__/providers/cognito/utils/srp/AuthenticationHelper.test.ts b/packages/auth/__tests__/providers/cognito/utils/srp/AuthenticationHelper.test.ts
index 0c8c9a847e5..1ed0e0d229c 100644
--- a/packages/auth/__tests__/providers/cognito/utils/srp/AuthenticationHelper.test.ts
+++ b/packages/auth/__tests__/providers/cognito/utils/srp/AuthenticationHelper.test.ts
@@ -82,7 +82,6 @@ describe('AuthenticationHelper', () => {
 	describe('generateHashDevice', () => {
 		const deviceGroupKey = 'device-group-key';
 		const username = 'user-name';
-		const randomString = 'random-string';
 		// create spies
 		const modPowSpy = jest.spyOn(BigInteger.prototype, 'modPow');
 
diff --git a/packages/auth/__tests__/providers/cognito/utils/srp/getAuthenticationHelper.test.ts b/packages/auth/__tests__/providers/cognito/utils/srp/getAuthenticationHelper.test.ts
index 506a52f5af6..458e9856a15 100644
--- a/packages/auth/__tests__/providers/cognito/utils/srp/getAuthenticationHelper.test.ts
+++ b/packages/auth/__tests__/providers/cognito/utils/srp/getAuthenticationHelper.test.ts
@@ -28,8 +28,8 @@ describe('getAuthenticationHelper', () => {
 	it('should generate with non-deterministic seeding', async () => {
 		const arr: string[] = [];
 		for (let i = 0; i < 20; i++) {
-			const helper = await getAuthenticationHelper('TestPoolName');
-			arr.push(helper.a.toString(16));
+			const newHelper = await getAuthenticationHelper('TestPoolName');
+			arr.push(newHelper.a.toString(16));
 		}
 		expect(arr.length).toBe(new Set(arr).size);
 	});
diff --git a/packages/auth/src/providers/cognito/credentialsProvider/IdentityIdProvider.ts b/packages/auth/src/providers/cognito/credentialsProvider/IdentityIdProvider.ts
index 32fbaeb1369..4a8614a3db0 100644
--- a/packages/auth/src/providers/cognito/credentialsProvider/IdentityIdProvider.ts
+++ b/packages/auth/src/providers/cognito/credentialsProvider/IdentityIdProvider.ts
@@ -12,13 +12,12 @@ import { IdentityIdStore } from './types';
 import { formLoginsMap } from './utils';
 
 const logger = new ConsoleLogger('CognitoIdentityIdProvider');
-
 /**
  * Provides a Cognito identityId
  *
  * @param tokens - The AuthTokens received after SignIn
  * @returns string
- * @throws configuration exceptions: {@link InvalidIdentityPoolIdException }
+ * @throws configuration exceptions: `InvalidIdentityPoolIdException`
  *  - Auth errors that may arise from misconfiguration.
  * @throws service exceptions: {@link GetIdException }
  */
diff --git a/packages/auth/src/providers/cognito/credentialsProvider/index.ts b/packages/auth/src/providers/cognito/credentialsProvider/index.ts
index 389c08bcf4d..02acda4d3a3 100644
--- a/packages/auth/src/providers/cognito/credentialsProvider/index.ts
+++ b/packages/auth/src/providers/cognito/credentialsProvider/index.ts
@@ -15,7 +15,7 @@ import { CognitoAWSCredentialsAndIdentityIdProvider } from './credentialsProvide
  * Cognito specific implmentation of the CredentialsProvider interface
  * that manages setting and getting of AWS Credentials.
  *
- * @throws configuration expections: {@link InvalidIdentityPoolIdException }
+ * @throws configuration expections: `InvalidIdentityPoolIdException`
  *  - Auth errors that may arise from misconfiguration.
  * @throws service expections: {@link GetCredentialsForIdentityException}, {@link GetIdException}
  *
diff --git a/packages/auth/src/types/inputs.ts b/packages/auth/src/types/inputs.ts
index 2ea988e227d..437f5e398f4 100644
--- a/packages/auth/src/types/inputs.ts
+++ b/packages/auth/src/types/inputs.ts
@@ -98,10 +98,11 @@ export interface AuthConfirmSignUpInput<
 	confirmationCode: string;
 	options?: ServiceOptions;
 }
+
 /**
  * Constructs a `confirmSignIn` input.
  *
- * @param challengeResponse - required parameter for responding to {@link AuthSignInStep } returned during
+ * @param challengeResponse - required parameter for responding to `AuthSignInStep` returned during
  * the sign in process.
  * @param options - optional parameters for the Confirm Sign In process such as the service options
  */