diff --git a/packages/desktop-client/src/components/Titlebar.tsx b/packages/desktop-client/src/components/Titlebar.tsx
index f7eba43e8e7..8179cb88542 100644
--- a/packages/desktop-client/src/components/Titlebar.tsx
+++ b/packages/desktop-client/src/components/Titlebar.tsx
@@ -60,15 +60,16 @@ type PrivacyButtonProps = {
 };
 
 function PrivacyButton({ style }: PrivacyButtonProps) {
-  const [isPrivacyEnabled, setPrivacyEnabledPref] =
+  const [isPrivacyEnabledPref, setPrivacyEnabledPref] =
     useSyncedPref('isPrivacyEnabled');
+  const isPrivacyEnabled = String(isPrivacyEnabledPref) === 'true';
 
   const privacyIconStyle = { width: 15, height: 15 };
 
   useHotkeys(
     'shift+ctrl+p, shift+cmd+p, shift+meta+p',
     () => {
-      setPrivacyEnabledPref(!isPrivacyEnabled);
+      setPrivacyEnabledPref(String(!isPrivacyEnabled));
     },
     {
       preventDefault: true,
@@ -81,7 +82,7 @@ function PrivacyButton({ style }: PrivacyButtonProps) {
     <Button
       variant="bare"
       aria-label={`${isPrivacyEnabled ? 'Disable' : 'Enable'} privacy mode`}
-      onPress={() => setPrivacyEnabledPref(!isPrivacyEnabled)}
+      onPress={() => setPrivacyEnabledPref(String(!isPrivacyEnabled))}
       style={style}
     >
       {isPrivacyEnabled ? (
diff --git a/packages/desktop-client/src/components/accounts/Account.tsx b/packages/desktop-client/src/components/accounts/Account.tsx
index 07090da96b8..d3f39dce71e 100644
--- a/packages/desktop-client/src/components/accounts/Account.tsx
+++ b/packages/desktop-client/src/components/accounts/Account.tsx
@@ -1836,7 +1836,7 @@ export function Account() {
   const payees = usePayees();
   const failedAccounts = useFailedAccounts();
   const dateFormat = useDateFormat() || 'MM/dd/yyyy';
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
   const [expandSplits] = useLocalPref('expand-splits');
   const [showBalances, setShowBalances] = useSyncedPref(
     `show-balances-${params.id}`,
@@ -1871,16 +1871,20 @@ export function Account() {
           accounts={accounts}
           failedAccounts={failedAccounts}
           dateFormat={dateFormat}
-          hideFraction={hideFraction}
+          hideFraction={String(hideFraction) === 'true'}
           expandSplits={expandSplits}
-          showBalances={showBalances}
-          setShowBalances={setShowBalances}
-          showCleared={!hideCleared}
-          setShowCleared={val => setHideCleared(!val)}
-          showReconciled={!hideReconciled}
-          setShowReconciled={val => setHideReconciled(!val)}
-          showExtraBalances={showExtraBalances}
-          setShowExtraBalances={setShowExtraBalances}
+          showBalances={String(showBalances) === 'true'}
+          setShowBalances={showBalances =>
+            setShowBalances(String(showBalances))
+          }
+          showCleared={String(hideCleared) !== 'true'}
+          setShowCleared={val => setHideCleared(String(!val))}
+          showReconciled={String(hideReconciled) !== 'true'}
+          setShowReconciled={val => setHideReconciled(String(!val))}
+          showExtraBalances={String(showExtraBalances) === 'true'}
+          setShowExtraBalances={extraBalances =>
+            setShowExtraBalances(String(extraBalances))
+          }
           payees={payees}
           modalShowing={modalShowing}
           accountsSyncing={accountsSyncing}
diff --git a/packages/desktop-client/src/components/mobile/accounts/Account.jsx b/packages/desktop-client/src/components/mobile/accounts/Account.jsx
index 5073870bd8e..129b0765980 100644
--- a/packages/desktop-client/src/components/mobile/accounts/Account.jsx
+++ b/packages/desktop-client/src/components/mobile/accounts/Account.jsx
@@ -22,7 +22,7 @@ export function Account() {
 
   const [_numberFormat] = useSyncedPref('numberFormat');
   const numberFormat = _numberFormat || 'comma-dot';
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
 
   const { id: accountId } = useParams();
 
diff --git a/packages/desktop-client/src/components/mobile/accounts/AccountTransactions.jsx b/packages/desktop-client/src/components/mobile/accounts/AccountTransactions.jsx
index 470b11c0bc6..1ab45cdd8c8 100644
--- a/packages/desktop-client/src/components/mobile/accounts/AccountTransactions.jsx
+++ b/packages/desktop-client/src/components/mobile/accounts/AccountTransactions.jsx
@@ -31,7 +31,6 @@ import { isPreviewId } from 'loot-core/shared/transactions';
 import { useDateFormat } from '../../../hooks/useDateFormat';
 import { useNavigate } from '../../../hooks/useNavigate';
 import { usePreviewTransactions } from '../../../hooks/usePreviewTransactions';
-import { useSyncedPref } from '../../../hooks/useSyncedPref';
 import { styles, theme } from '../../../style';
 import { Text } from '../../common/Text';
 import { View } from '../../common/View';
@@ -153,7 +152,6 @@ function TransactionListWithPreviews({ account }) {
   );
 
   const dateFormat = useDateFormat() || 'MM/dd/yyyy';
-  const [_numberFormat] = useSyncedPref('numberFormat');
   const dispatch = useDispatch();
   const navigate = useNavigate();
 
diff --git a/packages/desktop-client/src/components/mobile/accounts/Accounts.jsx b/packages/desktop-client/src/components/mobile/accounts/Accounts.jsx
index 86a0c5cefb1..a81c9cdd653 100644
--- a/packages/desktop-client/src/components/mobile/accounts/Accounts.jsx
+++ b/packages/desktop-client/src/components/mobile/accounts/Accounts.jsx
@@ -251,7 +251,7 @@ export function Accounts() {
   const updatedAccounts = useSelector(state => state.queries.updatedAccounts);
   const [_numberFormat] = useSyncedPref('numberFormat');
   const numberFormat = _numberFormat || 'comma-dot';
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
 
   const navigate = useNavigate();
 
diff --git a/packages/desktop-client/src/components/mobile/budget/Category.tsx b/packages/desktop-client/src/components/mobile/budget/Category.tsx
index 0fc742e9568..768c3281c21 100644
--- a/packages/desktop-client/src/components/mobile/budget/Category.tsx
+++ b/packages/desktop-client/src/components/mobile/budget/Category.tsx
@@ -14,7 +14,7 @@ export function Category() {
   useSetThemeColor(theme.mobileViewTheme);
   const [_numberFormat] = useSyncedPref('numberFormat');
   const numberFormat = _numberFormat || 'comma-dot';
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
 
   const { id: categoryId } = useParams();
   const [searchParams] = useSearchParams();
diff --git a/packages/desktop-client/src/components/mobile/budget/CategoryTransactions.jsx b/packages/desktop-client/src/components/mobile/budget/CategoryTransactions.jsx
index 7b0f6c7cf46..917121fbe8e 100644
--- a/packages/desktop-client/src/components/mobile/budget/CategoryTransactions.jsx
+++ b/packages/desktop-client/src/components/mobile/budget/CategoryTransactions.jsx
@@ -13,7 +13,6 @@ import { isPreviewId } from 'loot-core/shared/transactions';
 
 import { useDateFormat } from '../../../hooks/useDateFormat';
 import { useNavigate } from '../../../hooks/useNavigate';
-import { useSyncedPref } from '../../../hooks/useSyncedPref';
 import { TextOneLine } from '../../common/TextOneLine';
 import { View } from '../../common/View';
 import { MobilePageHeader, Page } from '../../Page';
@@ -29,7 +28,6 @@ export function CategoryTransactions({ category, month }) {
   const [transactions, setTransactions] = useState([]);
 
   const dateFormat = useDateFormat() || 'MM/dd/yyyy';
-  const [_numberFormat] = useSyncedPref('numberFormat');
 
   const makeRootQuery = useCallback(
     () =>
diff --git a/packages/desktop-client/src/components/mobile/budget/index.tsx b/packages/desktop-client/src/components/mobile/budget/index.tsx
index 47ce76e5656..cf1fc310b38 100644
--- a/packages/desktop-client/src/components/mobile/budget/index.tsx
+++ b/packages/desktop-client/src/components/mobile/budget/index.tsx
@@ -38,6 +38,10 @@ import { SyncRefresh } from '../../SyncRefresh';
 
 import { BudgetTable } from './BudgetTable';
 
+function isBudgetType(input?: string): input is 'rollover' | 'report' {
+  return ['rollover', 'report'].includes(input);
+}
+
 type BudgetInnerProps = {
   categories: CategoryEntity[];
   categoryGroups: CategoryGroupEntity[];
@@ -60,7 +64,7 @@ function BudgetInner(props: BudgetInnerProps) {
 
   const [_numberFormat] = useSyncedPref('numberFormat');
   const numberFormat = _numberFormat || 'comma-dot';
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
   const dispatch = useDispatch();
 
   useEffect(() => {
@@ -462,14 +466,14 @@ function BudgetInner(props: BudgetInnerProps) {
 
 export function Budget() {
   const { list: categories, grouped: categoryGroups } = useCategories();
-  const [budgetType = 'rollover'] = useSyncedPref('budgetType');
+  const [budgetType] = useSyncedPref('budgetType');
   const spreadsheet = useSpreadsheet();
   useSetThemeColor(theme.mobileViewTheme);
   return (
     <BudgetInner
       categoryGroups={categoryGroups}
       categories={categories}
-      budgetType={budgetType}
+      budgetType={isBudgetType(budgetType) ? budgetType : 'rollover'}
       spreadsheet={spreadsheet}
     />
   );
diff --git a/packages/desktop-client/src/components/mobile/transactions/FocusableAmountInput.tsx b/packages/desktop-client/src/components/mobile/transactions/FocusableAmountInput.tsx
index 9284c0f4b39..ad89d0b0a12 100644
--- a/packages/desktop-client/src/components/mobile/transactions/FocusableAmountInput.tsx
+++ b/packages/desktop-client/src/components/mobile/transactions/FocusableAmountInput.tsx
@@ -46,7 +46,7 @@ const AmountInput = memo(function AmountInput({
   const [text, setText] = useState('');
   const [value, setValue] = useState(0);
   const inputRef = useRef<HTMLInputElement>();
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
 
   const mergedInputRef = useMergedRefs<HTMLInputElement>(
     props.inputRef,
@@ -107,7 +107,7 @@ const AmountInput = memo(function AmountInput({
   };
 
   const onChangeText = (text: string) => {
-    text = appendDecimals(text, hideFraction);
+    text = appendDecimals(text, String(hideFraction) === 'true');
     setEditing(true);
     setText(text);
     props.onChangeValue?.(text);
diff --git a/packages/desktop-client/src/components/modals/ImportTransactions.jsx b/packages/desktop-client/src/components/modals/ImportTransactions.jsx
index d3f281a59fc..4c9bf2e3c85 100644
--- a/packages/desktop-client/src/components/modals/ImportTransactions.jsx
+++ b/packages/desktop-client/src/components/modals/ImportTransactions.jsx
@@ -875,13 +875,13 @@ export function ImportTransactions({ options }) {
       (filename.endsWith('.tsv') ? '\t' : ','),
   );
   const [skipLines, setSkipLines] = useState(
-    prefs[`csv-skip-lines-${accountId}`] ?? 0,
+    parseInt(prefs[`csv-skip-lines-${accountId}`], 10) || 0,
   );
   const [hasHeaderRow, setHasHeaderRow] = useState(
-    prefs[`csv-has-header-${accountId}`] ?? true,
+    String(prefs[`csv-has-header-${accountId}`]) !== 'false',
   );
   const [fallbackMissingPayeeToMemo, setFallbackMissingPayeeToMemo] = useState(
-    prefs[`ofx-fallback-missing-payee-${accountId}`] ?? true,
+    String(prefs[`ofx-fallback-missing-payee-${accountId}`]) !== 'false',
   );
 
   const [parseDateFormat, setParseDateFormat] = useState(null);
@@ -923,7 +923,8 @@ export function ImportTransactions({ options }) {
       let parseDateFormat = null;
 
       if (filetype === 'csv' || filetype === 'qif') {
-        flipAmount = prefs[`flip-amount-${accountId}-${filetype}`] || false;
+        flipAmount =
+          String(prefs[`flip-amount-${accountId}-${filetype}`]) === 'true';
         setFlipAmount(flipAmount);
       }
 
@@ -1186,7 +1187,9 @@ export function ImportTransactions({ options }) {
 
     if (isOfxFile(filetype)) {
       savePrefs({
-        [`ofx-fallback-missing-payee-${accountId}`]: fallbackMissingPayeeToMemo,
+        [`ofx-fallback-missing-payee-${accountId}`]: String(
+          fallbackMissingPayeeToMemo,
+        ),
       });
     }
 
@@ -1195,12 +1198,14 @@ export function ImportTransactions({ options }) {
         [`csv-mappings-${accountId}`]: JSON.stringify(fieldMappings),
       });
       savePrefs({ [`csv-delimiter-${accountId}`]: delimiter });
-      savePrefs({ [`csv-has-header-${accountId}`]: hasHeaderRow });
-      savePrefs({ [`csv-skip-lines-${accountId}`]: skipLines });
+      savePrefs({ [`csv-has-header-${accountId}`]: String(hasHeaderRow) });
+      savePrefs({ [`csv-skip-lines-${accountId}`]: String(skipLines) });
     }
 
     if (filetype === 'csv' || filetype === 'qif') {
-      savePrefs({ [`flip-amount-${accountId}-${filetype}`]: flipAmount });
+      savePrefs({
+        [`flip-amount-${accountId}-${filetype}`]: String(flipAmount),
+      });
     }
 
     const didChange = await importTransactions(
diff --git a/packages/desktop-client/src/components/settings/Experimental.tsx b/packages/desktop-client/src/components/settings/Experimental.tsx
index 8165e465f6d..fa6da21cf84 100644
--- a/packages/desktop-client/src/components/settings/Experimental.tsx
+++ b/packages/desktop-client/src/components/settings/Experimental.tsx
@@ -36,7 +36,7 @@ function FeatureToggle({
       <Checkbox
         checked={enabled}
         onChange={() => {
-          setFlagPref(!enabled);
+          setFlagPref(String(!enabled));
         }}
         disabled={disableToggle}
       />
diff --git a/packages/desktop-client/src/components/settings/Format.tsx b/packages/desktop-client/src/components/settings/Format.tsx
index ebde12163c0..d3cbfd8f833 100644
--- a/packages/desktop-client/src/components/settings/Format.tsx
+++ b/packages/desktop-client/src/components/settings/Format.tsx
@@ -62,8 +62,7 @@ export function FormatSettings() {
   const [, setDateFormatPref] = useSyncedPref('dateFormat');
   const [_numberFormat, setNumberFormatPref] = useSyncedPref('numberFormat');
   const numberFormat = _numberFormat || 'comma-dot';
-  const [hideFraction = false, setHideFractionPref] =
-    useSyncedPref('hideFraction');
+  const [hideFraction, setHideFractionPref] = useSyncedPref('hideFraction');
 
   const selectButtonStyle: CSSProperties = {
     ':hover': {
@@ -95,7 +94,7 @@ export function FormatSettings() {
               onChange={format => setNumberFormatPref(format)}
               options={numberFormats.map(f => [
                 f.value,
-                hideFraction ? f.labelNoFraction : f.label,
+                String(hideFraction) === 'true' ? f.labelNoFraction : f.label,
               ])}
               buttonStyle={selectButtonStyle}
             />
@@ -103,8 +102,10 @@ export function FormatSettings() {
             <Text style={{ display: 'flex' }}>
               <Checkbox
                 id="settings-textDecimal"
-                checked={!!hideFraction}
-                onChange={e => setHideFractionPref(e.currentTarget.checked)}
+                checked={String(hideFraction) === 'true'}
+                onChange={e =>
+                  setHideFractionPref(String(e.currentTarget.checked))
+                }
               />
               <label htmlFor="settings-textDecimal">Hide decimal places</label>
             </Text>
diff --git a/packages/desktop-client/src/components/util/AmountInput.tsx b/packages/desktop-client/src/components/util/AmountInput.tsx
index b3f18b17eaa..147b0066cb6 100644
--- a/packages/desktop-client/src/components/util/AmountInput.tsx
+++ b/packages/desktop-client/src/components/util/AmountInput.tsx
@@ -63,7 +63,7 @@ export function AmountInput({
   const buttonRef = useRef();
   const ref = useRef<HTMLInputElement>(null);
   const mergedRef = useMergedRefs<HTMLInputElement>(inputRef, ref);
-  const [hideFraction = false] = useSyncedPref('hideFraction');
+  const [hideFraction] = useSyncedPref('hideFraction');
 
   useEffect(() => {
     if (focused) {
@@ -81,7 +81,9 @@ export function AmountInput({
   }
 
   function onInputTextChange(val) {
-    val = autoDecimals ? appendDecimals(val, hideFraction) : val;
+    val = autoDecimals
+      ? appendDecimals(val, String(hideFraction) === 'true')
+      : val;
     setValue(val ? val : '');
     onChangeValue?.(val);
   }
diff --git a/packages/desktop-client/src/hooks/useFeatureFlag.ts b/packages/desktop-client/src/hooks/useFeatureFlag.ts
index 168c80d7fac..7bfd067d097 100644
--- a/packages/desktop-client/src/hooks/useFeatureFlag.ts
+++ b/packages/desktop-client/src/hooks/useFeatureFlag.ts
@@ -17,6 +17,6 @@ export function useFeatureFlag(name: FeatureFlag): boolean {
 
     return value === undefined
       ? DEFAULT_FEATURE_FLAG_STATE[name] || false
-      : value;
+      : String(value) === 'true';
   });
 }
diff --git a/packages/desktop-client/src/hooks/usePrivacyMode.ts b/packages/desktop-client/src/hooks/usePrivacyMode.ts
index ffa633bc04f..9fad6ae30ae 100644
--- a/packages/desktop-client/src/hooks/usePrivacyMode.ts
+++ b/packages/desktop-client/src/hooks/usePrivacyMode.ts
@@ -1,9 +1,6 @@
-import { useSelector } from 'react-redux';
-
-import { type State } from 'loot-core/src/client/state-types';
+import { useSyncedPref } from './useSyncedPref';
 
 export function usePrivacyMode() {
-  return useSelector(
-    (state: State) => state.prefs.local?.isPrivacyEnabled ?? false,
-  );
+  const [isPrivacyEnabled] = useSyncedPref('isPrivacyEnabled');
+  return String(isPrivacyEnabled) === 'true';
 }
diff --git a/packages/loot-core/src/client/reducers/prefs.ts b/packages/loot-core/src/client/reducers/prefs.ts
index cb0d91654bf..0d74961596a 100644
--- a/packages/loot-core/src/client/reducers/prefs.ts
+++ b/packages/loot-core/src/client/reducers/prefs.ts
@@ -1,5 +1,5 @@
 // @ts-strict-ignore
-import { setNumberFormat } from '../../shared/util';
+import { isNumberFormat, setNumberFormat } from '../../shared/util';
 import * as constants from '../constants';
 import type { Action } from '../state-types';
 import type { PrefsState } from '../state-types/prefs';
@@ -14,19 +14,27 @@ export function update(state = initialState, action: Action): PrefsState {
     case constants.SET_PREFS:
       if (action.prefs) {
         setNumberFormat({
-          format: action.prefs.numberFormat || 'comma-dot',
-          hideFraction: action.prefs.hideFraction,
+          format: isNumberFormat(action.prefs.numberFormat)
+            ? action.prefs.numberFormat
+            : 'comma-dot',
+          hideFraction: String(action.prefs.hideFraction) === 'true',
         });
       }
       return { local: action.prefs, global: action.globalPrefs };
     case constants.MERGE_LOCAL_PREFS:
       if (action.prefs.numberFormat || action.prefs.hideFraction != null) {
         setNumberFormat({
-          format: action.prefs.numberFormat || state.local.numberFormat,
+          format: isNumberFormat(action.prefs.numberFormat)
+            ? action.prefs.numberFormat
+            : isNumberFormat(state.local.numberFormat)
+              ? state.local.numberFormat
+              : 'comma-dot',
           hideFraction:
-            action.prefs.hideFraction != null
-              ? action.prefs.hideFraction
-              : state.local.hideFraction,
+            String(
+              action.prefs.hideFraction != null
+                ? action.prefs.hideFraction
+                : state.local.hideFraction,
+            ) === 'true',
         });
       }
 
diff --git a/packages/loot-core/src/client/selectors.ts b/packages/loot-core/src/client/selectors.ts
index 5d86c6de8b6..ddb43568919 100644
--- a/packages/loot-core/src/client/selectors.ts
+++ b/packages/loot-core/src/client/selectors.ts
@@ -1,7 +1,7 @@
 // @ts-strict-ignore
 import { createSelector } from 'reselect';
 
-import { getNumberFormat } from '../shared/util';
+import { getNumberFormat, isNumberFormat } from '../shared/util';
 
 import type { State } from './state-types';
 
@@ -12,7 +12,7 @@ const getLocalPrefsState = createSelector(getPrefsState, prefs => prefs.local);
 
 export const selectNumberFormat = createSelector(getLocalPrefsState, prefs =>
   getNumberFormat({
-    format: prefs.numberFormat,
-    hideFraction: prefs.hideFraction,
+    format: isNumberFormat(prefs.numberFormat) ? prefs.numberFormat : undefined,
+    hideFraction: String(prefs.hideFraction) === 'true',
   }),
 );
diff --git a/packages/loot-core/src/shared/util.ts b/packages/loot-core/src/shared/util.ts
index 4b46d0d73fe..879a8535fc0 100644
--- a/packages/loot-core/src/shared/util.ts
+++ b/packages/loot-core/src/shared/util.ts
@@ -222,12 +222,20 @@ export function appendDecimals(
   return amountToCurrency(currencyToAmount(result));
 }
 
-type NumberFormats =
-  | 'comma-dot'
-  | 'dot-comma'
-  | 'space-comma'
-  | 'apostrophe-dot'
-  | 'comma-dot-in';
+const NUMBER_FORMATS = [
+  'comma-dot',
+  'dot-comma',
+  'space-comma',
+  'apostrophe-dot',
+  'comma-dot',
+  'comma-dot-in',
+] as const;
+
+type NumberFormats = (typeof NUMBER_FORMATS)[number];
+
+export function isNumberFormat(input: string): input is NumberFormats {
+  return (NUMBER_FORMATS as readonly string[]).includes(input);
+}
 
 export const numberFormats: Array<{
   value: NumberFormats;
diff --git a/packages/loot-core/src/types/prefs.d.ts b/packages/loot-core/src/types/prefs.d.ts
index 839dd625b52..fe88076afab 100644
--- a/packages/loot-core/src/types/prefs.d.ts
+++ b/packages/loot-core/src/types/prefs.d.ts
@@ -1,5 +1,3 @@
-import { type numberFormats } from '../shared/util';
-
 import { spendingReportTimeType } from './models/reports';
 
 export type FeatureFlag =
@@ -13,31 +11,28 @@ export type FeatureFlag =
  * Cross-device preferences. These sync across devices when they are changed.
  */
 export type SyncedPrefs = Partial<
-  {
-    firstDayOfWeekIdx: `${0 | 1 | 2 | 3 | 4 | 5 | 6}`;
-    dateFormat:
-      | 'MM/dd/yyyy'
-      | 'dd/MM/yyyy'
-      | 'yyyy-MM-dd'
-      | 'MM.dd.yyyy'
-      | 'dd.MM.yyyy';
-    numberFormat: (typeof numberFormats)[number]['value'];
-    hideFraction: boolean;
-    isPrivacyEnabled: boolean;
-    [key: `show-balances-${string}`]: boolean;
-    [key: `show-extra-balances-${string}`]: boolean;
-    [key: `hide-cleared-${string}`]: boolean;
-    [key: `hide-reconciled-${string}`]: boolean;
+  Record<
+    | 'firstDayOfWeekIdx'
+    | 'dateFormat'
+    | 'numberFormat'
+    | 'hideFraction'
+    | 'isPrivacyEnabled'
+    | `show-balances-${string}`
+    | `show-extra-balances-${string}`
+    | `hide-cleared-${string}`
+    | `hide-reconciled-${string}`
     // TODO: pull from src/components/modals/ImportTransactions.js
-    [key: `parse-date-${string}-${'csv' | 'qif'}`]: string;
-    [key: `csv-mappings-${string}`]: string;
-    [key: `csv-delimiter-${string}`]: ',' | ';' | '\t';
-    [key: `csv-skip-lines-${string}`]: number;
-    [key: `csv-has-header-${string}`]: boolean;
-    [key: `ofx-fallback-missing-payee-${string}`]: boolean;
-    [key: `flip-amount-${string}-${'csv' | 'qif'}`]: boolean;
-    budgetType: 'report' | 'rollover';
-  } & Record<`flags.${FeatureFlag}`, boolean>
+    | `parse-date-${string}-${'csv' | 'qif'}`
+    | `csv-mappings-${string}`
+    | `csv-delimiter-${string}`
+    | `csv-skip-lines-${string}`
+    | `csv-has-header-${string}`
+    | `ofx-fallback-missing-payee-${string}`
+    | `flip-amount-${string}-${'csv' | 'qif'}`
+    | 'budgetType'
+    | `flags.${FeatureFlag}`,
+    string
+  >
 >;
 
 /**
diff --git a/tsconfig.json b/tsconfig.json
index 59f6d0d4bd1..79731b69816 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -31,14 +31,14 @@
     "noEmit": true,
     "paths": {
       // until we turn on composite/references
-      "loot-core/*": ["./packages/loot-core/src/*"],
+      "loot-core/*": ["./packages/loot-core/src/*"]
     },
     "plugins": [
       {
         "name": "typescript-strict-plugin",
-        "path": ["./packages"],
-      },
-    ],
+        "path": ["./packages"]
+      }
+    ]
   },
   "include": ["packages/**/*"],
   "exclude": [
@@ -48,10 +48,11 @@
     "**/client-build/*",
     "**/dist/*",
     "**/lib-dist/*",
+    "**/test-results/*"
   ],
   "ts-node": {
     "compilerOptions": {
-      "module": "CommonJS",
-    },
-  },
+      "module": "CommonJS"
+    }
+  }
 }
diff --git a/upcoming-release-notes/3395.md b/upcoming-release-notes/3395.md
new file mode 100644
index 00000000000..99f2245c913
--- /dev/null
+++ b/upcoming-release-notes/3395.md
@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [MatissJanis]
+---
+
+SyncedPrefs: refactor pref values from explicit types to `string`.