diff --git a/waspc/data/Generator/templates/react-app/src/auth/email/actions/login.ts b/waspc/data/Generator/templates/react-app/src/auth/email/actions/login.ts
index 121a65a1e..c287486ef 100644
--- a/waspc/data/Generator/templates/react-app/src/auth/email/actions/login.ts
+++ b/waspc/data/Generator/templates/react-app/src/auth/email/actions/login.ts
@@ -6,7 +6,7 @@ export async function login(data: { email: string; password: string }): Promise<
     try {
         const response = await api.post('{= loginPath =}', data);
         await initSession(response.data.token);
-    } catch (e: unknown) {
+    } catch (e) {
         handleApiError(e);
     }
 }
diff --git a/waspc/data/Generator/templates/react-app/src/auth/email/actions/passwordReset.ts b/waspc/data/Generator/templates/react-app/src/auth/email/actions/passwordReset.ts
index 68e6fa814..b37cb2761 100644
--- a/waspc/data/Generator/templates/react-app/src/auth/email/actions/passwordReset.ts
+++ b/waspc/data/Generator/templates/react-app/src/auth/email/actions/passwordReset.ts
@@ -5,7 +5,7 @@ export async function requestPasswordReset(data: { email: string; }): Promise<{
     try {
         const response = await api.post('{= requestPasswordResetPath =}', data);
         return response.data;
-    } catch (e: unknown) {
+    } catch (e) {
         handleApiError(e);
     }
 }
@@ -14,7 +14,7 @@ export async function resetPassword(data: { token: string; password: string; }):
     try {
         const response = await api.post('{= resetPasswordPath =}', data);
         return response.data;
-    } catch (e: unknown) {
+    } catch (e) {
         handleApiError(e);
     }
 }
diff --git a/waspc/data/Generator/templates/react-app/src/auth/email/actions/signup.ts b/waspc/data/Generator/templates/react-app/src/auth/email/actions/signup.ts
index 3095b4317..ad2a37eb8 100644
--- a/waspc/data/Generator/templates/react-app/src/auth/email/actions/signup.ts
+++ b/waspc/data/Generator/templates/react-app/src/auth/email/actions/signup.ts
@@ -5,7 +5,7 @@ export async function signup(data: { email: string; password: string }): Promise
     try {
         const response = await api.post('{= signupPath =}', data);
         return response.data;
-    } catch (e: unknown) {
+    } catch (e) {
         handleApiError(e);
     }
 }
diff --git a/waspc/data/Generator/templates/react-app/src/auth/email/actions/verifyEmail.ts b/waspc/data/Generator/templates/react-app/src/auth/email/actions/verifyEmail.ts
index cfeb90edd..4c2cfff58 100644
--- a/waspc/data/Generator/templates/react-app/src/auth/email/actions/verifyEmail.ts
+++ b/waspc/data/Generator/templates/react-app/src/auth/email/actions/verifyEmail.ts
@@ -1,11 +1,13 @@
 {{={= =}=}}
-import api, { handleApiError } from '../../../api';
+import api, { handleApiError } from '../../../api'
 
-export async function verifyEmail(data: { token: string; }): Promise<{ success: boolean; reason?: string; }> {
-    try {
-        const response = await api.post('{= verifyEmailPath =}', data);
-        return response.data;
-    } catch (e: unknown) {
-        handleApiError(e);
-    }
+export async function verifyEmail(data: {
+  token: string
+}): Promise<{ success: boolean; reason?: string }> {
+  try {
+    const response = await api.post('{= verifyEmailPath =}', data)
+    return response.data
+  } catch (e) {
+    handleApiError(e)
+  }
 }
diff --git a/waspc/data/Generator/templates/react-app/src/auth/forms/Auth.tsx b/waspc/data/Generator/templates/react-app/src/auth/forms/Auth.tsx
index b048e2278..afe6479e7 100644
--- a/waspc/data/Generator/templates/react-app/src/auth/forms/Auth.tsx
+++ b/waspc/data/Generator/templates/react-app/src/auth/forms/Auth.tsx
@@ -265,7 +265,7 @@ function Auth ({ state, appearance, logo, socialLayout = 'horizontal' }: {
   // TODO(matija): this is called on every render, is it a problem?
   // If we do it in useEffect(), then there is a glitch between the default color and the
   // user provided one.
-  const customTheme = createTheme(appearance)
+  const customTheme = createTheme(appearance ?? {})
 
   const cta = isLogin ? 'Log in' : 'Sign up'
   const titles: Record<State, string> = {
@@ -497,7 +497,7 @@ const VerifyEmailForm = ({ isLoading, setIsLoading, setErrorMessage, setSuccessM
   const location = useLocation()
   const token = new URLSearchParams(location.search).get('token')
 
-  const submitForm = useCallback(async () => {
+  async function submitForm() {
     if (!token) {
       setErrorMessage('The token is missing from the URL. Please check the link you received in your email.')
       return
@@ -513,7 +513,7 @@ const VerifyEmailForm = ({ isLoading, setIsLoading, setErrorMessage, setSuccessM
     } finally {
       setIsLoading(false)
     }
-  })
+  }
 
   useEffect(() => {
     submitForm()
diff --git a/waspc/data/Generator/templates/react-app/tsconfig.json b/waspc/data/Generator/templates/react-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/data/Generator/templates/react-app/tsconfig.json
+++ b/waspc/data/Generator/templates/react-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },
diff --git a/waspc/data/Generator/templates/server/src/types/index.ts b/waspc/data/Generator/templates/server/src/types/index.ts
index 6ce951f7b..cc80863c6 100644
--- a/waspc/data/Generator/templates/server/src/types/index.ts
+++ b/waspc/data/Generator/templates/server/src/types/index.ts
@@ -1,6 +1,6 @@
 {{={= =}=}}
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -10,13 +10,13 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
 {=# isExternalAuthEnabled =}
-export { GetUserFieldsFn } from '../auth/providers/oauth/types';
+export type { GetUserFieldsFn } from '../auth/providers/oauth/types';
 {=/ isExternalAuthEnabled =}
 
 {=# isEmailAuthEnabled =}
-export { GetVerificationEmailContentFn, GetPasswordResetEmailContentFn } from '../auth/providers/email/types';
+export type { GetVerificationEmailContentFn, GetPasswordResetEmailContentFn } from '../auth/providers/email/types';
 {=/ isEmailAuthEnabled =}
diff --git a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/.waspchecksums b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/.waspchecksums
index 8e218ffca..736661150 100644
--- a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/.waspchecksums
+++ b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/.waspchecksums
@@ -214,7 +214,7 @@
             "file",
             "server/src/types/index.ts"
         ],
-        "82570549b7c746ecc2f95f7497750a506dd297c131c41bd05547de8c844adeda"
+        "1fd50e251e340a5bc8c51369766e8c889cf892cdbe6593b4d58a6ee585b6d2cc"
     ],
     [
         [
@@ -529,7 +529,7 @@
             "file",
             "web-app/tsconfig.json"
         ],
-        "27e39dd3e6155ffccdb1d9cb0cba8db7d9e06e10958bee900340a2d9f17400c8"
+        "887c55937264ea8b2c538340962c3011091cf3eb6b9d39523acbe8ebcdd35474"
     ],
     [
         [
diff --git a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/server/src/types/index.ts b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/server/src/types/index.ts
index c601eef36..bef664aac 100644
--- a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/server/src/types/index.ts
+++ b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/server/src/types/index.ts
@@ -1,5 +1,5 @@
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -9,7 +9,7 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
 
diff --git a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/web-app/tsconfig.json b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/web-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/web-app/tsconfig.json
+++ b/waspc/e2e-test/test-outputs/waspBuild-golden/waspBuild/.wasp/build/web-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },
diff --git a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/.waspchecksums b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/.waspchecksums
index 572451a43..25fc0a55e 100644
--- a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/.waspchecksums
+++ b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/.waspchecksums
@@ -221,7 +221,7 @@
             "file",
             "server/src/types/index.ts"
         ],
-        "82570549b7c746ecc2f95f7497750a506dd297c131c41bd05547de8c844adeda"
+        "1fd50e251e340a5bc8c51369766e8c889cf892cdbe6593b4d58a6ee585b6d2cc"
     ],
     [
         [
@@ -543,7 +543,7 @@
             "file",
             "web-app/tsconfig.json"
         ],
-        "27e39dd3e6155ffccdb1d9cb0cba8db7d9e06e10958bee900340a2d9f17400c8"
+        "887c55937264ea8b2c538340962c3011091cf3eb6b9d39523acbe8ebcdd35474"
     ],
     [
         [
diff --git a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/server/src/types/index.ts b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/server/src/types/index.ts
index c601eef36..bef664aac 100644
--- a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/server/src/types/index.ts
+++ b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/server/src/types/index.ts
@@ -1,5 +1,5 @@
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -9,7 +9,7 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
 
diff --git a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/web-app/tsconfig.json b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/web-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/web-app/tsconfig.json
+++ b/waspc/e2e-test/test-outputs/waspCompile-golden/waspCompile/.wasp/out/web-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },
diff --git a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/.waspchecksums b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/.waspchecksums
index cb753d244..11896b814 100644
--- a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/.waspchecksums
+++ b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/.waspchecksums
@@ -445,7 +445,7 @@
             "file",
             "server/src/types/index.ts"
         ],
-        "6b9dcc39aee89af771c01c9daf84aa769968081dd9b1b22a96e98f09366b06a8"
+        "04e01e653bd889436903843cf1dae0a6ba0ecbc1c369beef0e90fae4d0c21127"
     ],
     [
         [
@@ -592,7 +592,7 @@
             "file",
             "web-app/src/auth/forms/Auth.tsx"
         ],
-        "f62b429c2a3749e8147198184d4612de7d1a82d1370696487b1aa65eb2e4b5b9"
+        "6e74c3affea9fdc6c71d94fa2875298b4e5bdcf71b89b63320d0a52d81c18652"
     ],
     [
         [
@@ -907,7 +907,7 @@
             "file",
             "web-app/tsconfig.json"
         ],
-        "27e39dd3e6155ffccdb1d9cb0cba8db7d9e06e10958bee900340a2d9f17400c8"
+        "887c55937264ea8b2c538340962c3011091cf3eb6b9d39523acbe8ebcdd35474"
     ],
     [
         [
diff --git a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/server/src/types/index.ts b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/server/src/types/index.ts
index ecf8bc0e3..6ac9afb13 100644
--- a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/server/src/types/index.ts
+++ b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/server/src/types/index.ts
@@ -1,5 +1,5 @@
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -9,8 +9,8 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
-export { GetUserFieldsFn } from '../auth/providers/oauth/types';
+export type { GetUserFieldsFn } from '../auth/providers/oauth/types';
 
diff --git a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/src/auth/forms/Auth.tsx b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/src/auth/forms/Auth.tsx
index 555005515..837da3b8a 100644
--- a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/src/auth/forms/Auth.tsx
+++ b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/src/auth/forms/Auth.tsx
@@ -205,7 +205,7 @@ function Auth ({ state, appearance, logo, socialLayout = 'horizontal' }: {
   // TODO(matija): this is called on every render, is it a problem?
   // If we do it in useEffect(), then there is a glitch between the default color and the
   // user provided one.
-  const customTheme = createTheme(appearance)
+  const customTheme = createTheme(appearance ?? {})
 
   const cta = isLogin ? 'Log in' : 'Sign up'
   const titles: Record<State, string> = {
diff --git a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/tsconfig.json b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/tsconfig.json
+++ b/waspc/e2e-test/test-outputs/waspComplexTest-golden/waspComplexTest/.wasp/out/web-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },
diff --git a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/.waspchecksums b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/.waspchecksums
index c09367ae4..9caf037e6 100644
--- a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/.waspchecksums
+++ b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/.waspchecksums
@@ -235,7 +235,7 @@
             "file",
             "server/src/types/index.ts"
         ],
-        "82570549b7c746ecc2f95f7497750a506dd297c131c41bd05547de8c844adeda"
+        "1fd50e251e340a5bc8c51369766e8c889cf892cdbe6593b4d58a6ee585b6d2cc"
     ],
     [
         [
@@ -557,7 +557,7 @@
             "file",
             "web-app/tsconfig.json"
         ],
-        "27e39dd3e6155ffccdb1d9cb0cba8db7d9e06e10958bee900340a2d9f17400c8"
+        "887c55937264ea8b2c538340962c3011091cf3eb6b9d39523acbe8ebcdd35474"
     ],
     [
         [
diff --git a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/server/src/types/index.ts b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/server/src/types/index.ts
index c601eef36..bef664aac 100644
--- a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/server/src/types/index.ts
+++ b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/server/src/types/index.ts
@@ -1,5 +1,5 @@
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -9,7 +9,7 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
 
diff --git a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/web-app/tsconfig.json b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/web-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/web-app/tsconfig.json
+++ b/waspc/e2e-test/test-outputs/waspJob-golden/waspJob/.wasp/out/web-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },
diff --git a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/.waspchecksums b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/.waspchecksums
index 6e9e37b54..b910764f7 100644
--- a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/.waspchecksums
+++ b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/.waspchecksums
@@ -221,7 +221,7 @@
             "file",
             "server/src/types/index.ts"
         ],
-        "82570549b7c746ecc2f95f7497750a506dd297c131c41bd05547de8c844adeda"
+        "1fd50e251e340a5bc8c51369766e8c889cf892cdbe6593b4d58a6ee585b6d2cc"
     ],
     [
         [
@@ -543,7 +543,7 @@
             "file",
             "web-app/tsconfig.json"
         ],
-        "27e39dd3e6155ffccdb1d9cb0cba8db7d9e06e10958bee900340a2d9f17400c8"
+        "887c55937264ea8b2c538340962c3011091cf3eb6b9d39523acbe8ebcdd35474"
     ],
     [
         [
diff --git a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/server/src/types/index.ts b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/server/src/types/index.ts
index c601eef36..bef664aac 100644
--- a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/server/src/types/index.ts
+++ b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/server/src/types/index.ts
@@ -1,5 +1,5 @@
 
-import { Application } from 'express'
+import { type Application } from 'express'
 import { Server } from 'http'
 
 export type ServerSetupFn = (context: ServerSetupFnContext) => Promise<void>
@@ -9,7 +9,7 @@ export type ServerSetupFnContext = {
   server: Server,
 }
 
-export { Application } from 'express'
+export type { Application } from 'express'
 export { Server } from 'http'
 
 
diff --git a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/web-app/tsconfig.json b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/web-app/tsconfig.json
index fdeb6c94b..c5012408c 100644
--- a/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/web-app/tsconfig.json
+++ b/waspc/e2e-test/test-outputs/waspMigrate-golden/waspMigrate/.wasp/out/web-app/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/vite-react/tsconfig.json",
   "compilerOptions": {
     // Temporary loosen the type checking until we can address all the errors.
+    "jsx": "preserve",
     "allowJs": true,
     "strict": false
   },