diff --git a/packages/desktop-client/e2e/budget.mobile.test.ts b/packages/desktop-client/e2e/budget.mobile.test.ts
index ac479ea4a0a..51b30fd8ef9 100644
--- a/packages/desktop-client/e2e/budget.mobile.test.ts
+++ b/packages/desktop-client/e2e/budget.mobile.test.ts
@@ -60,6 +60,9 @@ async function setBudgetAverage(
     await budgetPage.goToPreviousMonth();
     const spentButton = await budgetPage.getButtonForSpent(categoryName);
     const spent = await spentButton.textContent();
+    if (!spent) {
+      throw new Error('Failed to get spent amount');
+    }
     totalSpent += currencyToAmount(spent) ?? 0;
   }
 
@@ -280,6 +283,10 @@ budgetTypes.forEach(budgetType => {
 
       const lastMonthBudget = await budgetedButton.textContent();
 
+      if (!lastMonthBudget) {
+        throw new Error('Failed to get last month budget');
+      }
+
       await budgetPage.goToNextMonth();
 
       await copyLastMonthBudget(budgetPage, categoryName);
diff --git a/packages/desktop-client/e2e/page-models/account-page.js b/packages/desktop-client/e2e/page-models/account-page.ts
similarity index 74%
rename from packages/desktop-client/e2e/page-models/account-page.js
rename to packages/desktop-client/e2e/page-models/account-page.ts
index cbdf4efef41..ebbee3f0068 100644
--- a/packages/desktop-client/e2e/page-models/account-page.js
+++ b/packages/desktop-client/e2e/page-models/account-page.ts
@@ -1,7 +1,33 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { CloseAccountModal } from './close-account-modal';
 
+type TransactionEntry = {
+  debit?: string;
+  credit?: string;
+  account?: string;
+  payee?: string;
+  notes?: string;
+  category?: string;
+};
+
 export class AccountPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly accountName: Locator;
+  readonly accountBalance: Locator;
+  readonly addNewTransactionButton: Locator;
+  readonly newTransactionRow: Locator;
+  readonly addTransactionButton: Locator;
+  readonly cancelTransactionButton: Locator;
+  readonly accountMenuButton: Locator;
+  readonly transactionTable: Locator;
+  readonly transactionTableRow: Locator;
+  readonly filterButton: Locator;
+  readonly filterSelectTooltip: Locator;
+  readonly selectButton: Locator;
+  readonly selectTooltip: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
     this.accountName = this.page.getByTestId('account-name');
@@ -30,14 +56,14 @@ export class AccountPage {
     this.selectTooltip = this.page.getByTestId('transactions-select-tooltip');
   }
 
-  async waitFor() {
-    await this.transactionTable.waitFor();
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.transactionTable.waitFor(...options);
   }
 
   /**
    * Enter details of a transaction
    */
-  async enterSingleTransaction(transaction) {
+  async enterSingleTransaction(transaction: TransactionEntry) {
     await this.addNewTransactionButton.click();
     await this._fillTransactionFields(this.newTransactionRow, transaction);
   }
@@ -53,7 +79,7 @@ export class AccountPage {
   /**
    * Create a single transaction
    */
-  async createSingleTransaction(transaction) {
+  async createSingleTransaction(transaction: TransactionEntry) {
     await this.enterSingleTransaction(transaction);
     await this.addEnteredTransaction();
   }
@@ -61,7 +87,10 @@ export class AccountPage {
   /**
    * Create split transactions
    */
-  async createSplitTransaction([rootTransaction, ...transactions]) {
+  async createSplitTransaction([
+    rootTransaction,
+    ...transactions
+  ]: TransactionEntry[]) {
     await this.addNewTransactionButton.click();
 
     // Root transaction
@@ -87,7 +116,7 @@ export class AccountPage {
     await this.cancelTransactionButton.click();
   }
 
-  async selectNthTransaction(index) {
+  async selectNthTransaction(index: number) {
     const row = this.transactionTableRow.nth(index);
     await row.getByTestId('select').click();
   }
@@ -96,7 +125,7 @@ export class AccountPage {
    * Retrieve the data for the nth-transaction.
    * 0-based index
    */
-  getNthTransaction(index) {
+  getNthTransaction(index: number) {
     const row = this.transactionTableRow.nth(index);
 
     return this._getTransactionDetails(row);
@@ -106,11 +135,9 @@ export class AccountPage {
     return this._getTransactionDetails(this.newTransactionRow);
   }
 
-  _getTransactionDetails(row) {
-    const account = row.getByTestId('account');
-
+  _getTransactionDetails(row: Locator) {
     return {
-      ...(account ? { account } : {}),
+      account: row.getByTestId('account'),
       payee: row.getByTestId('payee'),
       notes: row.getByTestId('notes'),
       category: row.getByTestId('category'),
@@ -119,7 +146,7 @@ export class AccountPage {
     };
   }
 
-  async clickSelectAction(action) {
+  async clickSelectAction(action: string | RegExp) {
     await this.selectButton.click();
     await this.selectTooltip.getByRole('button', { name: action }).click();
   }
@@ -130,16 +157,13 @@ export class AccountPage {
   async clickCloseAccount() {
     await this.accountMenuButton.click();
     await this.page.getByRole('button', { name: 'Close Account' }).click();
-    return new CloseAccountModal(
-      this.page,
-      this.page.getByTestId('close-account-modal'),
-    );
+    return new CloseAccountModal(this.page.getByTestId('close-account-modal'));
   }
 
   /**
    * Open the filtering popover.
    */
-  async filterBy(field) {
+  async filterBy(field: string | RegExp) {
     await this.filterButton.click();
     await this.filterSelectTooltip.getByRole('button', { name: field }).click();
 
@@ -149,7 +173,7 @@ export class AccountPage {
   /**
    * Filter to a specific note
    */
-  async filterByNote(note) {
+  async filterByNote(note: string) {
     const filterTooltip = await this.filterBy('Note');
     await this.page.keyboard.type(note);
     await filterTooltip.applyButton.click();
@@ -158,14 +182,17 @@ export class AccountPage {
   /**
    * Remove the nth filter
    */
-  async removeFilter(idx) {
+  async removeFilter(idx: number) {
     await this.page
       .getByRole('button', { name: 'Delete filter' })
       .nth(idx)
       .click();
   }
 
-  async _fillTransactionFields(transactionRow, transaction) {
+  async _fillTransactionFields(
+    transactionRow: Locator,
+    transaction: TransactionEntry,
+  ) {
     if (transaction.debit) {
       await transactionRow.getByTestId('debit').click();
       await this.page.keyboard.type(transaction.debit);
@@ -210,8 +237,11 @@ export class AccountPage {
 }
 
 class FilterTooltip {
-  constructor(page) {
-    this.page = page;
-    this.applyButton = page.getByRole('button', { name: 'Apply' });
+  readonly locator: Locator;
+  readonly applyButton: Locator;
+
+  constructor(locator: Locator) {
+    this.locator = locator;
+    this.applyButton = locator.getByRole('button', { name: 'Apply' });
   }
 }
diff --git a/packages/desktop-client/e2e/page-models/budget-page.js b/packages/desktop-client/e2e/page-models/budget-page.js
deleted file mode 100644
index 86b168a2e1d..00000000000
--- a/packages/desktop-client/e2e/page-models/budget-page.js
+++ /dev/null
@@ -1,89 +0,0 @@
-import { AccountPage } from './account-page';
-
-export class BudgetPage {
-  constructor(page) {
-    this.page = page;
-
-    this.budgetSummary = page.getByTestId('budget-summary');
-    this.budgetTable = page.getByTestId('budget-table');
-    this.budgetTableTotals = this.budgetTable.getByTestId('budget-totals');
-  }
-
-  async getTableTotals() {
-    return {
-      budgeted: parseInt(
-        await this.budgetTableTotals
-          .getByTestId(/total-budgeted$/)
-          .textContent(),
-        10,
-      ),
-      spent: parseInt(
-        await this.budgetTableTotals.getByTestId(/total-spent$/).textContent(),
-        10,
-      ),
-      balance: parseInt(
-        await this.budgetTableTotals
-          .getByTestId(/total-leftover$/)
-          .textContent(),
-        10,
-      ),
-    };
-  }
-
-  async showMoreMonths() {
-    await this.page.getByTestId('calendar-icon').first().click();
-  }
-
-  async getBalanceForRow(idx) {
-    return Math.round(
-      parseFloat(
-        (
-          await this.budgetTable
-            .getByTestId('row')
-            .nth(idx)
-            .getByTestId('balance')
-            .textContent()
-        ).replace(/,/g, ''),
-      ) * 100,
-    );
-  }
-
-  async getCategoryNameForRow(idx) {
-    return this.budgetTable
-      .getByTestId('row')
-      .nth(idx)
-      .getByTestId('category-name')
-      .textContent();
-  }
-
-  async clickOnSpentAmountForRow(idx) {
-    await this.budgetTable
-      .getByTestId('row')
-      .nth(idx)
-      .getByTestId('category-month-spent')
-      .click();
-    return new AccountPage(this.page);
-  }
-
-  async transferAllBalance(fromIdx, toIdx) {
-    const toName = await this.getCategoryNameForRow(toIdx);
-
-    await this.budgetTable
-      .getByTestId('row')
-      .nth(fromIdx)
-      .getByTestId('balance')
-      .getByTestId(/^budget/)
-      .click();
-
-    await this.page
-      .getByRole('button', { name: 'Transfer to another category' })
-      .click();
-
-    await this.page.getByPlaceholder('(none)').click();
-
-    await this.page.keyboard.type(toName);
-    await this.page.keyboard.press('Enter');
-
-    await this.page.getByRole('button', { name: 'Transfer' }).click();
-  }
-}
diff --git a/packages/desktop-client/e2e/page-models/budget-page.ts b/packages/desktop-client/e2e/page-models/budget-page.ts
new file mode 100644
index 00000000000..99f90242950
--- /dev/null
+++ b/packages/desktop-client/e2e/page-models/budget-page.ts
@@ -0,0 +1,128 @@
+import { type Locator, type Page } from '@playwright/test';
+
+import { AccountPage } from './account-page';
+
+export class BudgetPage {
+  readonly page: Page;
+  readonly budgetSummary: Locator;
+  readonly budgetTable: Locator;
+  readonly budgetTableTotals: Locator;
+
+  constructor(page: Page) {
+    this.page = page;
+
+    this.budgetSummary = page.getByTestId('budget-summary');
+    this.budgetTable = page.getByTestId('budget-table');
+    this.budgetTableTotals = this.budgetTable.getByTestId('budget-totals');
+  }
+
+  async getTotalBudgeted() {
+    const totalBudgetedText = await this.budgetTableTotals
+      .getByTestId(/total-budgeted$/)
+      .textContent();
+
+    if (!totalBudgetedText) {
+      throw new Error('Failed to get total budgeted.');
+    }
+
+    return parseInt(totalBudgetedText, 10);
+  }
+
+  async getTotalSpent() {
+    const totalSpentText = await this.budgetTableTotals
+      .getByTestId(/total-spent$/)
+      .textContent();
+
+    if (!totalSpentText) {
+      throw new Error('Failed to get total spent.');
+    }
+
+    return parseInt(totalSpentText, 10);
+  }
+
+  async getTotalLeftover() {
+    const totalLeftoverText = await this.budgetTableTotals
+      .getByTestId(/total-leftover$/)
+      .textContent();
+
+    if (!totalLeftoverText) {
+      throw new Error('Failed to get total leftover.');
+    }
+
+    return parseInt(totalLeftoverText, 10);
+  }
+
+  async getTableTotals() {
+    return {
+      budgeted: await this.getTotalBudgeted(),
+      spent: await this.getTotalSpent(),
+      balance: await this.getTotalLeftover(),
+    };
+  }
+
+  async showMoreMonths() {
+    await this.page.getByTestId('calendar-icon').first().click();
+  }
+
+  async getBalanceForRow(idx: number) {
+    const balanceText = await this.budgetTable
+      .getByTestId('row')
+      .nth(idx)
+      .getByTestId('balance')
+      .textContent();
+
+    if (!balanceText) {
+      throw new Error(`Failed to get balance on row index ${idx}.`);
+    }
+
+    return Math.round(parseFloat(balanceText.replace(/,/g, '')) * 100);
+  }
+
+  async getCategoryNameForRow(idx: number) {
+    const categoryNameText = this.budgetTable
+      .getByTestId('row')
+      .nth(idx)
+      .getByTestId('category-name')
+      .textContent();
+
+    if (!categoryNameText) {
+      throw new Error(`Failed to get category name on row index ${idx}.`);
+    }
+
+    return categoryNameText;
+  }
+
+  async clickOnSpentAmountForRow(idx: number) {
+    await this.budgetTable
+      .getByTestId('row')
+      .nth(idx)
+      .getByTestId('category-month-spent')
+      .click();
+    return new AccountPage(this.page);
+  }
+
+  async transferAllBalance(fromIdx: number, toIdx: number) {
+    const toName = await this.getCategoryNameForRow(toIdx);
+    if (!toName) {
+      throw new Error(`Unable to get category name of row index ${toIdx}.`);
+    }
+
+    await this.budgetTable
+      .getByTestId('row')
+      .nth(fromIdx)
+      .getByTestId('balance')
+      .getByTestId(/^budget/)
+      .click();
+
+    await this.page
+      .getByRole('button', { name: 'Transfer to another category' })
+      .click();
+
+    await this.page.getByPlaceholder('(none)').click();
+
+    await this.page.keyboard.type(toName);
+    await this.page.keyboard.press('Enter');
+
+    await this.page.getByRole('button', { name: 'Transfer' }).click();
+  }
+}
diff --git a/packages/desktop-client/e2e/page-models/close-account-modal.js b/packages/desktop-client/e2e/page-models/close-account-modal.ts
similarity index 56%
rename from packages/desktop-client/e2e/page-models/close-account-modal.js
rename to packages/desktop-client/e2e/page-models/close-account-modal.ts
index dc975a1d71f..36b2a062e32 100644
--- a/packages/desktop-client/e2e/page-models/close-account-modal.js
+++ b/packages/desktop-client/e2e/page-models/close-account-modal.ts
@@ -1,10 +1,15 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class CloseAccountModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly locator: Locator;
+  readonly page: Page;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
   }
 
-  async selectTransferAccount(accountName) {
+  async selectTransferAccount(accountName: string) {
     await this.locator.getByPlaceholder('Select account...').fill(accountName);
     await this.page.keyboard.press('Enter');
   }
diff --git a/packages/desktop-client/e2e/page-models/configuration-page.js b/packages/desktop-client/e2e/page-models/configuration-page.ts
similarity index 89%
rename from packages/desktop-client/e2e/page-models/configuration-page.js
rename to packages/desktop-client/e2e/page-models/configuration-page.ts
index 903ec5dfdd9..daa2c9efbac 100644
--- a/packages/desktop-client/e2e/page-models/configuration-page.js
+++ b/packages/desktop-client/e2e/page-models/configuration-page.ts
@@ -1,8 +1,13 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { AccountPage } from './account-page';
 import { BudgetPage } from './budget-page';
 
 export class ConfigurationPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly heading: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
     this.heading = page.getByRole('heading');
@@ -23,7 +28,7 @@ export class ConfigurationPage {
     return new AccountPage(this.page);
   }
 
-  async importBudget(type, file) {
+  async importBudget(type: 'YNAB4' | 'nYNAB' | 'Actual', file: string) {
     const fileChooserPromise = this.page.waitForEvent('filechooser');
     await this.page.getByRole('button', { name: 'Import my budget' }).click();
 
diff --git a/packages/desktop-client/e2e/page-models/custom-report-page.js b/packages/desktop-client/e2e/page-models/custom-report-page.ts
similarity index 70%
rename from packages/desktop-client/e2e/page-models/custom-report-page.js
rename to packages/desktop-client/e2e/page-models/custom-report-page.ts
index 493160b5590..2de241afeb3 100644
--- a/packages/desktop-client/e2e/page-models/custom-report-page.js
+++ b/packages/desktop-client/e2e/page-models/custom-report-page.ts
@@ -1,5 +1,13 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class CustomReportPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly pageContent: Locator;
+  readonly showLegendButton: Locator;
+  readonly showSummaryButton: Locator;
+  readonly showLabelsButton: Locator;
+
+  constructor(page: Page) {
     this.page = page;
     this.pageContent = page.getByTestId('reports-page');
 
@@ -14,11 +22,11 @@ export class CustomReportPage {
     });
   }
 
-  async selectViz(vizName) {
+  async selectViz(vizName: string | RegExp) {
     await this.pageContent.getByRole('button', { name: vizName }).click();
   }
 
-  async selectMode(mode) {
+  async selectMode(mode: 'total' | 'time') {
     switch (mode) {
       case 'total':
         await this.pageContent.getByRole('button', { name: 'Total' }).click();
diff --git a/packages/desktop-client/e2e/page-models/mobile-account-page.js b/packages/desktop-client/e2e/page-models/mobile-account-page.ts
similarity index 60%
rename from packages/desktop-client/e2e/page-models/mobile-account-page.js
rename to packages/desktop-client/e2e/page-models/mobile-account-page.ts
index 009d3b556bd..4c7e312e776 100644
--- a/packages/desktop-client/e2e/page-models/mobile-account-page.js
+++ b/packages/desktop-client/e2e/page-models/mobile-account-page.ts
@@ -1,7 +1,18 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { MobileTransactionEntryPage } from './mobile-transaction-entry-page';
 
 export class MobileAccountPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly heading: Locator;
+  readonly balance: Locator;
+  readonly noTransactionsMessage: Locator;
+  readonly searchBox: Locator;
+  readonly transactionList: Locator;
+  readonly transactions: Locator;
+  readonly createTransactionButton: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
     this.heading = page.getByRole('heading');
@@ -15,21 +26,25 @@ export class MobileAccountPage {
     });
   }
 
-  async waitFor() {
-    await this.transactionList.waitFor();
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.transactionList.waitFor(...options);
   }
 
   /**
    * Retrieve the balance of the account as a number
    */
   async getBalance() {
-    return parseInt(await this.balance.textContent(), 10);
+    const balanceText = await this.balance.textContent();
+    if (!balanceText) {
+      throw new Error('Failed to get balance.');
+    }
+    return parseInt(balanceText, 10);
   }
 
   /**
    * Search by the given term
    */
-  async searchByText(term) {
+  async searchByText(term: string) {
     await this.searchBox.fill(term);
   }
 
diff --git a/packages/desktop-client/e2e/page-models/mobile-accounts-page.js b/packages/desktop-client/e2e/page-models/mobile-accounts-page.ts
similarity index 64%
rename from packages/desktop-client/e2e/page-models/mobile-accounts-page.js
rename to packages/desktop-client/e2e/page-models/mobile-accounts-page.ts
index 365584e73e0..571244535fc 100644
--- a/packages/desktop-client/e2e/page-models/mobile-accounts-page.js
+++ b/packages/desktop-client/e2e/page-models/mobile-accounts-page.ts
@@ -1,21 +1,27 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { MobileAccountPage } from './mobile-account-page';
 
 export class MobileAccountsPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly accountList: Locator;
+  readonly accountListItems: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
     this.accountList = this.page.getByLabel('Account list');
     this.accountListItems = this.accountList.getByTestId('account-list-item');
   }
 
-  async waitFor() {
-    await this.accountList.waitFor();
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.accountList.waitFor(...options);
   }
 
   /**
    * Get the name and balance of the nth account
    */
-  async getNthAccount(idx) {
+  async getNthAccount(idx: number) {
     const accountRow = this.accountListItems.nth(idx);
 
     return {
@@ -27,7 +33,7 @@ export class MobileAccountsPage {
   /**
    * Click on the n-th account to open it up
    */
-  async openNthAccount(idx) {
+  async openNthAccount(idx: number) {
     await this.accountListItems.nth(idx).click();
 
     return new MobileAccountPage(this.page);
diff --git a/packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.js b/packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.ts
similarity index 62%
rename from packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.ts
index e802354013f..8c292271a4f 100644
--- a/packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-balance-menu-modal.ts
@@ -1,7 +1,18 @@
+import { type Page, type Locator } from '@playwright/test';
+
 export class BalanceMenuModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+  readonly balanceAmountInput: Locator;
+  readonly transferToAnotherCategoryButton: Locator;
+  readonly coverOverspendingButton: Locator;
+  readonly rolloverOverspendingButton: Locator;
+  readonly removeOverspendingRolloverButton: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
     this.balanceAmountInput = locator.getByTestId('amount-input');
diff --git a/packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.js b/packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.ts
similarity index 69%
rename from packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.ts
index 774448c6968..5f39f117213 100644
--- a/packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-budget-menu-modal.ts
@@ -1,7 +1,19 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class BudgetMenuModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+  readonly budgetAmountInput: Locator;
+  readonly copyLastMonthBudgetButton: Locator;
+  readonly setTo3MonthAverageButton: Locator;
+  readonly setTo6MonthAverageButton: Locator;
+  readonly setToYearlyAverageButton: Locator;
+  readonly applyBudgetTemplateButton: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
     this.budgetAmountInput = locator.getByTestId('amount-input');
@@ -26,8 +38,8 @@ export class BudgetMenuModal {
     await this.heading.getByRole('button', { name: 'Close' }).click();
   }
 
-  async setBudgetAmount(newAmount) {
-    await this.budgetAmountInput.fill(String(newAmount));
+  async setBudgetAmount(newAmount: string) {
+    await this.budgetAmountInput.fill(newAmount);
     await this.budgetAmountInput.blur();
     await this.close();
   }
diff --git a/packages/desktop-client/e2e/page-models/mobile-budget-page.js b/packages/desktop-client/e2e/page-models/mobile-budget-page.ts
similarity index 66%
rename from packages/desktop-client/e2e/page-models/mobile-budget-page.js
rename to packages/desktop-client/e2e/page-models/mobile-budget-page.ts
index 3053557e144..daa7804b27d 100644
--- a/packages/desktop-client/e2e/page-models/mobile-budget-page.js
+++ b/packages/desktop-client/e2e/page-models/mobile-budget-page.ts
@@ -1,3 +1,5 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { MobileAccountPage } from './mobile-account-page';
 import { BalanceMenuModal } from './mobile-balance-menu-modal';
 import { BudgetMenuModal } from './mobile-budget-menu-modal';
@@ -6,24 +8,47 @@ import { EnvelopeBudgetSummaryModal } from './mobile-envelope-budget-summary-mod
 import { TrackingBudgetSummaryModal } from './mobile-tracking-budget-summary-modal';
 
 export class MobileBudgetPage {
-  MONTH_HEADER_DATE_FORMAT = 'MMMM ‘yy';
-
-  constructor(page) {
+  readonly MONTH_HEADER_DATE_FORMAT = 'MMMM ‘yy';
+
+  readonly page: Page;
+  readonly heading: Locator;
+  readonly previousMonthButton: Locator;
+  readonly selectedBudgetMonthButton: Locator;
+  readonly nextMonthButton: Locator;
+  readonly budgetPageMenuButton: Locator;
+  readonly budgetTableHeader: Locator;
+  readonly toBudgetButton: Locator;
+  readonly overbudgetedButton: Locator;
+  readonly savedButton: Locator;
+  readonly projectedSavingsButton: Locator;
+  readonly overspentButton: Locator;
+  readonly budgetedHeaderButton: Locator;
+  readonly spentHeaderButton: Locator;
+  readonly budgetTable: Locator;
+  readonly categoryRows: Locator;
+  readonly categoryNames: Locator;
+  readonly categoryGroupRows: Locator;
+  readonly categoryGroupNames: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
-    this.#initializePageHeaderLocators(page);
-    this.#initializeBudgetTableLocators(page);
-  }
+    // Page header locators
 
-  async determineBudgetType() {
-    return (await this.#getButtonForEnvelopeBudgetSummary({
-      throwIfNotFound: false,
-    })) !== null
-      ? 'Envelope'
-      : 'Tracking';
-  }
+    this.heading = page.getByRole('heading');
+    this.previousMonthButton = this.heading.getByRole('button', {
+      name: 'Previous month',
+    });
+    this.selectedBudgetMonthButton = this.heading.locator('button[data-month]');
+    this.nextMonthButton = this.heading.getByRole('button', {
+      name: 'Next month',
+    });
+    this.budgetPageMenuButton = page.getByRole('button', {
+      name: 'Budget page menu',
+    });
+
+    // Budget table locators
 
-  #initializeBudgetTableLocators(page) {
     this.budgetTableHeader = page.getByTestId('budget-table-header');
 
     // Envelope budget summary buttons
@@ -69,25 +94,21 @@ export class MobileBudgetPage {
     );
   }
 
-  #initializePageHeaderLocators(page) {
-    this.heading = page.getByRole('heading');
-    this.previousMonthButton = this.heading.getByRole('button', {
-      name: 'Previous month',
-    });
-    this.selectedBudgetMonthButton = this.heading.locator('button[data-month]');
-    this.nextMonthButton = this.heading.getByRole('button', {
-      name: 'Next month',
-    });
-    this.budgetPageMenuButton = page.getByRole('button', {
-      name: 'Budget page menu',
-    });
+  async determineBudgetType() {
+    return (await this.#getButtonForEnvelopeBudgetSummary({
+      throwIfNotFound: false,
+    })) !== null
+      ? 'Envelope'
+      : 'Tracking';
   }
 
-  async waitFor(options) {
-    await this.budgetTable.waitFor(options);
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.budgetTable.waitFor(...options);
   }
 
-  async toggleVisibleColumns(maxAttempts = 3) {
+  async toggleVisibleColumns({
+    maxAttempts = 3,
+  }: { maxAttempts?: number } = {}) {
     for (let i = 0; i < maxAttempts; i++) {
       if (await this.budgetedHeaderButton.isVisible()) {
         await this.budgetedHeaderButton.click();
@@ -100,55 +121,72 @@ export class MobileBudgetPage {
       await this.page.waitForTimeout(1000);
     }
 
-    throw new Error('Budgeted/Spent columns could not be located on the page');
+    throw new Error('Budgeted/Spent columns could not be located on the page.');
   }
 
   async getSelectedMonth() {
-    return await this.heading
+    const selectedMonth = await this.heading
       .locator('[data-month]')
       .getAttribute('data-month');
+
+    if (!selectedMonth) {
+      throw new Error('Failed to get the selected month.');
+    }
+
+    return selectedMonth;
   }
 
   async openBudgetPageMenu() {
     await this.budgetPageMenuButton.click();
   }
 
-  async getCategoryGroupNameForRow(idx) {
-    return this.categoryGroupNames.nth(idx).textContent();
+  async getCategoryGroupNameForRow(idx: number) {
+    const groupNameText = await this.categoryGroupNames.nth(idx).textContent();
+    if (!groupNameText) {
+      throw new Error(`Failed to get category group name for row ${idx}.`);
+    }
+    return groupNameText;
   }
 
-  #getButtonForCategoryGroup(categoryGroupName) {
+  #getButtonForCategoryGroup(categoryGroupName: string | RegExp) {
     return this.categoryGroupRows.getByRole('button', {
       name: categoryGroupName,
       exact: true,
     });
   }
 
-  async openCategoryGroupMenu(categoryGroupName) {
+  async openCategoryGroupMenu(categoryGroupName: string | RegExp) {
     const categoryGroupButton =
       await this.#getButtonForCategoryGroup(categoryGroupName);
     await categoryGroupButton.click();
   }
 
-  async getCategoryNameForRow(idx) {
-    return this.categoryNames.nth(idx).textContent();
+  async getCategoryNameForRow(idx: number) {
+    const categoryNameText = await this.categoryNames.nth(idx).textContent();
+    if (!categoryNameText) {
+      throw new Error(`Failed to get category name for row ${idx}.`);
+    }
+    return categoryNameText;
   }
 
-  #getButtonForCategory(categoryName) {
+  #getButtonForCategory(categoryName: string | RegExp) {
     return this.categoryRows.getByRole('button', {
       name: categoryName,
       exact: true,
     });
   }
 
-  async openCategoryMenu(categoryName) {
+  async openCategoryMenu(categoryName: string | RegExp) {
     const categoryButton = await this.#getButtonForCategory(categoryName);
     await categoryButton.click();
 
-    return new CategoryMenuModal(this.page, this.page.getByRole('dialog'));
+    return new CategoryMenuModal(this.page.getByRole('dialog'));
   }
 
-  async #getButtonForCell(buttonType, categoryName) {
+  async #getButtonForCell(
+    buttonType: 'Budgeted' | 'Spent',
+    categoryName: string,
+  ) {
     const buttonSelector =
       buttonType === 'Budgeted'
         ? `Open budget menu for ${categoryName} category`
@@ -168,43 +206,43 @@ export class MobileBudgetPage {
     }
 
     throw new Error(
-      `${buttonType} button for category ${categoryName} could not be located on the page`,
+      `${buttonType} button for category ${categoryName} could not be located on the page.`,
     );
   }
 
-  async getButtonForBudgeted(categoryName) {
+  async getButtonForBudgeted(categoryName: string) {
     return await this.#getButtonForCell('Budgeted', categoryName);
   }
 
-  async getButtonForSpent(categoryName) {
+  async getButtonForSpent(categoryName: string) {
     return await this.#getButtonForCell('Spent', categoryName);
   }
 
-  async openBudgetMenu(categoryName) {
+  async openBudgetMenu(categoryName: string) {
     const budgetedButton = await this.getButtonForBudgeted(categoryName);
     await budgetedButton.click();
 
-    return new BudgetMenuModal(this.page, this.page.getByRole('dialog'));
+    return new BudgetMenuModal(this.page.getByRole('dialog'));
   }
 
-  async openSpentPage(categoryName) {
+  async openSpentPage(categoryName: string) {
     const spentButton = await this.getButtonForSpent(categoryName);
     await spentButton.click();
 
     return new MobileAccountPage(this.page);
   }
 
-  async openBalanceMenu(categoryName) {
+  async openBalanceMenu(categoryName: string) {
     const balanceButton = this.budgetTable.getByRole('button', {
       name: `Open balance menu for ${categoryName} category`,
     });
 
     if (await balanceButton.isVisible()) {
       await balanceButton.click();
-      return new BalanceMenuModal(this.page, this.page.getByRole('dialog'));
+      return new BalanceMenuModal(this.page.getByRole('dialog'));
     } else {
       throw new Error(
-        `Balance button for category ${categoryName} not found or not visible`,
+        `Balance button for category ${categoryName} not found or not visible.`,
       );
     }
   }
@@ -213,7 +251,11 @@ export class MobileBudgetPage {
     currentMonth,
     errorMessage,
     maxAttempts = 3,
-  } = {}) {
+  }: {
+    currentMonth: string;
+    errorMessage: string;
+    maxAttempts: number;
+  }) {
     for (let attempt = 0; attempt < maxAttempts; attempt++) {
       const newMonth = await this.getSelectedMonth();
       if (newMonth !== currentMonth) {
@@ -225,7 +267,7 @@ export class MobileBudgetPage {
     throw new Error(errorMessage);
   }
 
-  async goToPreviousMonth({ maxAttempts = 3 } = {}) {
+  async goToPreviousMonth({ maxAttempts = 3 }: { maxAttempts?: number } = {}) {
     const currentMonth = await this.getSelectedMonth();
 
     await this.previousMonthButton.click();
@@ -234,7 +276,7 @@ export class MobileBudgetPage {
       currentMonth,
       maxAttempts,
       errorMessage:
-        'Failed to navigate to the previous month after maximum attempts',
+        'Failed to navigate to the previous month after maximum attempts.',
     });
   }
 
@@ -242,7 +284,7 @@ export class MobileBudgetPage {
     await this.selectedBudgetMonthButton.click();
   }
 
-  async goToNextMonth({ maxAttempts = 3 } = {}) {
+  async goToNextMonth({ maxAttempts = 3 }: { maxAttempts?: number } = {}) {
     const currentMonth = await this.getSelectedMonth();
 
     await this.nextMonthButton.click();
@@ -251,11 +293,13 @@ export class MobileBudgetPage {
       currentMonth,
       maxAttempts,
       errorMessage:
-        'Failed to navigate to the next month after maximum attempts',
+        'Failed to navigate to the next month after maximum attempts.',
     });
   }
 
-  async #getButtonForEnvelopeBudgetSummary({ throwIfNotFound = true } = {}) {
+  async #getButtonForEnvelopeBudgetSummary({
+    throwIfNotFound = true,
+  }: { throwIfNotFound?: boolean } = {}) {
     if (await this.toBudgetButton.isVisible()) {
       return this.toBudgetButton;
     }
@@ -269,21 +313,23 @@ export class MobileBudgetPage {
     }
 
     throw new Error(
-      'Neither “To Budget” nor “Overbudgeted” button could be located on the page',
+      'Neither “To Budget” nor “Overbudgeted” button could be located on the page.',
     );
   }
 
   async openEnvelopeBudgetSummary() {
     const budgetSummaryButton = await this.#getButtonForEnvelopeBudgetSummary();
+    if (!budgetSummaryButton) {
+      throw new Error('Envelope budget summary button not found.');
+    }
     await budgetSummaryButton.click();
 
-    return new EnvelopeBudgetSummaryModal(
-      this.page,
-      this.page.getByRole('dialog'),
-    );
+    return new EnvelopeBudgetSummaryModal(this.page.getByRole('dialog'));
   }
 
-  async #getButtonForTrackingBudgetSummary({ throwIfNotFound = true } = {}) {
+  async #getButtonForTrackingBudgetSummary({
+    throwIfNotFound = true,
+  }: { throwIfNotFound?: boolean } = {}) {
     if (await this.savedButton.isVisible()) {
       return this.savedButton;
     }
@@ -301,17 +347,17 @@ export class MobileBudgetPage {
     }
 
     throw new Error(
-      'None of “Saved”, “Projected savings”, or “Overspent” buttons could be located on the page',
+      'None of “Saved”, “Projected savings”, or “Overspent” buttons could be located on the page.',
     );
   }
 
   async openTrackingBudgetSummary() {
     const budgetSummaryButton = await this.#getButtonForTrackingBudgetSummary();
+    if (!budgetSummaryButton) {
+      throw new Error('Tracking budget summary button not found.');
+    }
     await budgetSummaryButton.click();
 
-    return new TrackingBudgetSummaryModal(
-      this.page,
-      this.page.getByRole('dialog'),
-    );
+    return new TrackingBudgetSummaryModal(this.page.getByRole('dialog'));
   }
 }
diff --git a/packages/desktop-client/e2e/page-models/mobile-category-menu-modal.js b/packages/desktop-client/e2e/page-models/mobile-category-menu-modal.ts
similarity index 58%
rename from packages/desktop-client/e2e/page-models/mobile-category-menu-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-category-menu-modal.ts
index f02ae03b8db..53319613e50 100644
--- a/packages/desktop-client/e2e/page-models/mobile-category-menu-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-category-menu-modal.ts
@@ -1,9 +1,17 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { EditNotesModal } from './mobile-edit-notes-modal';
 
 export class CategoryMenuModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+  readonly budgetAmountInput: Locator;
+  readonly editNotesButton: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
     this.budgetAmountInput = locator.getByTestId('amount-input');
@@ -17,6 +25,6 @@ export class CategoryMenuModal {
   async editNotes() {
     await this.editNotesButton.click();
 
-    return new EditNotesModal(this.page, this.page.getByRole('dialog'));
+    return new EditNotesModal(this.page.getByRole('dialog'));
   }
 }
diff --git a/packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.js b/packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.ts
similarity index 57%
rename from packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.ts
index c9c717df83f..845c8dbfc3f 100644
--- a/packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-edit-notes-modal.ts
@@ -1,7 +1,15 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class EditNotesModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+  readonly textArea: Locator;
+  readonly saveNotesButton: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
     this.textArea = locator.getByRole('textbox');
@@ -12,7 +20,7 @@ export class EditNotesModal {
     await this.heading.getByRole('button', { name: 'Close' }).click();
   }
 
-  async updateNotes(notes) {
+  async updateNotes(notes: string) {
     await this.textArea.fill(notes);
     await this.saveNotesButton.click();
   }
diff --git a/packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.js b/packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.ts
similarity index 51%
rename from packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.ts
index b0615c04d60..2f6efed0ea0 100644
--- a/packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-envelope-budget-summary-modal.ts
@@ -1,7 +1,13 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class EnvelopeBudgetSummaryModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
   }
diff --git a/packages/desktop-client/e2e/page-models/mobile-navigation.js b/packages/desktop-client/e2e/page-models/mobile-navigation.ts
similarity index 70%
rename from packages/desktop-client/e2e/page-models/mobile-navigation.js
rename to packages/desktop-client/e2e/page-models/mobile-navigation.ts
index 258ec5a77d4..14fba95cffa 100644
--- a/packages/desktop-client/e2e/page-models/mobile-navigation.js
+++ b/packages/desktop-client/e2e/page-models/mobile-navigation.ts
@@ -1,3 +1,5 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { MobileAccountPage } from './mobile-account-page';
 import { MobileAccountsPage } from './mobile-accounts-page';
 import { MobileBudgetPage } from './mobile-budget-page';
@@ -5,8 +7,30 @@ import { MobileReportsPage } from './mobile-reports-page';
 import { MobileTransactionEntryPage } from './mobile-transaction-entry-page';
 import { SettingsPage } from './settings-page';
 
+const NAVBAR_ROWS = 3;
+const NAV_LINKS_HIDDEN_BY_DEFAULT = [
+  'Reports',
+  'Schedules',
+  'Payees',
+  'Rules',
+  'Settings',
+];
+const ROUTES_BY_PAGE = {
+  Budget: '/budget',
+  Accounts: '/accounts',
+  Transaction: '/transactions/new',
+  Reports: '/reports',
+  Settings: '/settings',
+};
+
 export class MobileNavigation {
-  constructor(page) {
+  readonly page: Page;
+  readonly heading: Locator;
+  readonly navbar: Locator;
+  readonly mainContentSelector: string;
+  readonly navbarSelector: string;
+
+  constructor(page: Page) {
     this.page = page;
     this.heading = page.getByRole('heading');
     this.navbar = page.getByRole('navigation');
@@ -14,31 +38,23 @@ export class MobileNavigation {
     this.navbarSelector = '[role=navigation]';
   }
 
-  static #NAVBAR_ROWS = 3;
-  static #NAV_LINKS_HIDDEN_BY_DEFAULT = [
-    'Reports',
-    'Schedules',
-    'Payees',
-    'Rules',
-    'Settings',
-  ];
-  static #ROUTES_BY_PAGE = {
-    Budget: '/budget',
-    Accounts: '/accounts',
-    Transactions: '/transactions/new',
-    Reports: '/reports',
-    Settings: '/settings',
-  };
-
   async dragNavbarUp() {
     const mainContentBoundingBox = await this.page
       .locator(this.mainContentSelector)
       .boundingBox();
 
+    if (!mainContentBoundingBox) {
+      throw new Error('Unable to get bounding box of main content.');
+    }
+
     const navbarBoundingBox = await this.page
       .locator(this.navbarSelector)
       .boundingBox();
 
+    if (!navbarBoundingBox) {
+      throw new Error('Unable to get bounding box of navbar.');
+    }
+
     await this.page.dragAndDrop(this.navbarSelector, this.mainContentSelector, {
       sourcePosition: { x: 1, y: 0 },
       targetPosition: {
@@ -53,39 +69,47 @@ export class MobileNavigation {
       .locator(this.navbarSelector)
       .boundingBox();
 
+    if (!boundingBox) {
+      throw new Error('Unable to get bounding box of navbar.');
+    }
+
     await this.page.dragAndDrop(this.navbarSelector, this.navbarSelector, {
       sourcePosition: { x: 1, y: 0 },
       targetPosition: {
         x: 1,
         // Only scroll until bottom of screen i.e. bottom of first navbar row.
-        y: boundingBox.height / MobileNavigation.#NAVBAR_ROWS,
+        y: boundingBox.height / NAVBAR_ROWS,
       },
     });
   }
 
-  async hasNavbarState(...states) {
+  async hasNavbarState(...states: string[]) {
     if ((await this.navbar.count()) === 0) {
       // No navbar on page.
       return false;
     }
 
     const dataNavbarState = await this.navbar.getAttribute('data-navbar-state');
+    if (!dataNavbarState) {
+      throw new Error('Navbar does not have data-navbar-state attribute.');
+    }
     return states.includes(dataNavbarState);
   }
 
-  async navigateToPage(pageName, pageModelFactory) {
+  async navigateToPage<T extends { waitFor: Locator['waitFor'] }>(
+    pageName: keyof typeof ROUTES_BY_PAGE,
+    pageModelFactory: () => T,
+  ): Promise<T> {
     const pageInstance = pageModelFactory();
 
-    if (this.page.url().endsWith(MobileNavigation.#ROUTES_BY_PAGE[pageName])) {
+    if (this.page.url().endsWith(ROUTES_BY_PAGE[pageName])) {
       // Already on the page.
       return pageInstance;
     }
 
     await this.navbar.waitFor();
 
-    const navbarStates = MobileNavigation.#NAV_LINKS_HIDDEN_BY_DEFAULT.includes(
-      pageName,
-    )
+    const navbarStates = NAV_LINKS_HIDDEN_BY_DEFAULT.includes(pageName)
       ? ['default', 'hidden']
       : ['hidden'];
 
diff --git a/packages/desktop-client/e2e/page-models/mobile-reports-page.js b/packages/desktop-client/e2e/page-models/mobile-reports-page.js
deleted file mode 100644
index 76e317ab3c0..00000000000
--- a/packages/desktop-client/e2e/page-models/mobile-reports-page.js
+++ /dev/null
@@ -1,11 +0,0 @@
-export class MobileReportsPage {
-  constructor(page) {
-    this.page = page;
-
-    this.overview = page.getByTestId('reports-overview');
-  }
-
-  async waitFor(options) {
-    await this.overview.waitFor(options);
-  }
-}
diff --git a/packages/desktop-client/e2e/page-models/mobile-reports-page.ts b/packages/desktop-client/e2e/page-models/mobile-reports-page.ts
new file mode 100644
index 00000000000..74b5684426c
--- /dev/null
+++ b/packages/desktop-client/e2e/page-models/mobile-reports-page.ts
@@ -0,0 +1,16 @@
+import { type Locator, type Page } from '@playwright/test';
+
+export class MobileReportsPage {
+  readonly page: Page;
+  readonly overview: Locator;
+
+  constructor(page: Page) {
+    this.page = page;
+
+    this.overview = page.getByTestId('reports-overview');
+  }
+
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.overview.waitFor(...options);
+  }
+}
diff --git a/packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.js b/packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.ts
similarity index 51%
rename from packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.js
rename to packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.ts
index f6afab7b209..0a4de8bf281 100644
--- a/packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.js
+++ b/packages/desktop-client/e2e/page-models/mobile-tracking-budget-summary-modal.ts
@@ -1,7 +1,13 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class TrackingBudgetSummaryModal {
-  constructor(page, locator) {
-    this.page = page;
+  readonly page: Page;
+  readonly locator: Locator;
+  readonly heading: Locator;
+
+  constructor(locator: Locator) {
     this.locator = locator;
+    this.page = locator.page();
 
     this.heading = locator.getByRole('heading');
   }
diff --git a/packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.js b/packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.ts
similarity index 62%
rename from packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.js
rename to packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.ts
index b6de03dd92a..8937fd0d187 100644
--- a/packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.js
+++ b/packages/desktop-client/e2e/page-models/mobile-transaction-entry-page.ts
@@ -1,7 +1,16 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { MobileAccountPage } from './mobile-account-page';
 
 export class MobileTransactionEntryPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly header: Locator;
+  readonly amountField: Locator;
+  readonly transactionForm: Locator;
+  readonly footer: Locator;
+  readonly addTransactionButton: Locator;
+
+  constructor(page: Page) {
     this.page = page;
     this.header = page.getByRole('heading');
     this.transactionForm = page.getByTestId('transaction-form');
@@ -12,11 +21,11 @@ export class MobileTransactionEntryPage {
     });
   }
 
-  async waitFor(options) {
-    await this.transactionForm.waitFor(options);
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.transactionForm.waitFor(...options);
   }
 
-  async fillField(fieldLocator, content) {
+  async fillField(fieldLocator: Locator, content: string) {
     await fieldLocator.click();
     await this.page.locator('css=[role=combobox] input').fill(content);
     await this.page.keyboard.press('Enter');
diff --git a/packages/desktop-client/e2e/page-models/navigation.js b/packages/desktop-client/e2e/page-models/navigation.ts
similarity index 88%
rename from packages/desktop-client/e2e/page-models/navigation.js
rename to packages/desktop-client/e2e/page-models/navigation.ts
index 8e468847cd0..f665a2e8b77 100644
--- a/packages/desktop-client/e2e/page-models/navigation.js
+++ b/packages/desktop-client/e2e/page-models/navigation.ts
@@ -1,15 +1,25 @@
+import { type Page } from '@playwright/test';
+
 import { AccountPage } from './account-page';
 import { ReportsPage } from './reports-page';
 import { RulesPage } from './rules-page';
 import { SchedulesPage } from './schedules-page';
 import { SettingsPage } from './settings-page';
 
+type AccountEntry = {
+  name: string;
+  balance: number;
+  offBudget: boolean;
+};
+
 export class Navigation {
-  constructor(page) {
+  readonly page: Page;
+
+  constructor(page: Page) {
     this.page = page;
   }
 
-  async goToAccountPage(accountName) {
+  async goToAccountPage(accountName: string) {
     await this.page
       .getByRole('link', { name: new RegExp(`^${accountName}`) })
       .click();
@@ -55,7 +65,7 @@ export class Navigation {
     return new SettingsPage(this.page);
   }
 
-  async createAccount(data) {
+  async createAccount(data: AccountEntry) {
     await this.page.getByRole('button', { name: 'Add account' }).click();
     await this.page
       .getByRole('button', { name: 'Create a local account' })
diff --git a/packages/desktop-client/e2e/page-models/reports-page.js b/packages/desktop-client/e2e/page-models/reports-page.ts
similarity index 87%
rename from packages/desktop-client/e2e/page-models/reports-page.js
rename to packages/desktop-client/e2e/page-models/reports-page.ts
index c5c070f3cb8..a499c8692cd 100644
--- a/packages/desktop-client/e2e/page-models/reports-page.js
+++ b/packages/desktop-client/e2e/page-models/reports-page.ts
@@ -1,7 +1,12 @@
+import { type Locator, type Page } from '@playwright/test';
+
 import { CustomReportPage } from './custom-report-page';
 
 export class ReportsPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly pageContent: Locator;
+
+  constructor(page: Page) {
     this.page = page;
     this.pageContent = page.getByTestId('reports-page');
   }
diff --git a/packages/desktop-client/e2e/page-models/rules-page.js b/packages/desktop-client/e2e/page-models/rules-page.ts
similarity index 74%
rename from packages/desktop-client/e2e/page-models/rules-page.js
rename to packages/desktop-client/e2e/page-models/rules-page.ts
index 28f0c06fb42..be2d359c306 100644
--- a/packages/desktop-client/e2e/page-models/rules-page.js
+++ b/packages/desktop-client/e2e/page-models/rules-page.ts
@@ -1,5 +1,35 @@
+import { type Locator, type Page } from '@playwright/test';
+
+type ConditionsEntry = {
+  field: string;
+  op: string;
+  value: string;
+};
+
+type ActionsEntry = {
+  field: string;
+  op?: string;
+  value: string;
+};
+
+type SplitsEntry = {
+  field: string;
+  op?: string;
+  value?: string;
+};
+
+type RuleEntry = {
+  conditionsOp?: string | RegExp;
+  conditions?: ConditionsEntry[];
+  actions?: ActionsEntry[];
+  splits?: Array<SplitsEntry[]>;
+};
+
 export class RulesPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly searchBox: Locator;
+
+  constructor(page: Page) {
     this.page = page;
     this.searchBox = page.getByPlaceholder('Filter rules...');
   }
@@ -7,7 +37,7 @@ export class RulesPage {
   /**
    * Create a new rule
    */
-  async createRule(data) {
+  async createRule(data: RuleEntry) {
     await this.page
       .getByRole('button', {
         name: 'Create new rule',
@@ -23,7 +53,7 @@ export class RulesPage {
    * Retrieve the data for the nth-rule.
    * 0-based index
    */
-  getNthRule(index) {
+  getNthRule(index: number) {
     const row = this.page.getByTestId('table').getByTestId('row').nth(index);
 
     return {
@@ -32,11 +62,11 @@ export class RulesPage {
     };
   }
 
-  async searchFor(text) {
+  async searchFor(text: string) {
     await this.searchBox.fill(text);
   }
 
-  async _fillRuleFields(data) {
+  async _fillRuleFields(data: RuleEntry) {
     if (data.conditionsOp) {
       await this.page
         .getByTestId('conditions-op')
@@ -76,9 +106,13 @@ export class RulesPage {
     }
   }
 
-  async _fillEditorFields(data, rootElement, fieldFirst = false) {
-    for (const idx in data) {
-      const { field, op, value } = data[idx];
+  async _fillEditorFields(
+    data: Array<ConditionsEntry | ActionsEntry | SplitsEntry>,
+    rootElement: Locator,
+    fieldFirst = false,
+  ) {
+    for (const [idx, entry] of data.entries()) {
+      const { field, op, value } = entry;
 
       const row = rootElement.getByTestId('editor-row').nth(idx);
 
diff --git a/packages/desktop-client/e2e/page-models/schedules-page.js b/packages/desktop-client/e2e/page-models/schedules-page.ts
similarity index 78%
rename from packages/desktop-client/e2e/page-models/schedules-page.js
rename to packages/desktop-client/e2e/page-models/schedules-page.ts
index 3166b96509a..81ce61c09e5 100644
--- a/packages/desktop-client/e2e/page-models/schedules-page.js
+++ b/packages/desktop-client/e2e/page-models/schedules-page.ts
@@ -1,5 +1,17 @@
+import { type Locator, type Page } from '@playwright/test';
+
+type ScheduleEntry = {
+  payee?: string;
+  account?: string;
+  amount?: number;
+};
+
 export class SchedulesPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly addNewScheduleButton: Locator;
+  readonly schedulesTableRow: Locator;
+
+  constructor(page: Page) {
     this.page = page;
 
     this.addNewScheduleButton = this.page.getByRole('button', {
@@ -11,7 +23,7 @@ export class SchedulesPage {
   /**
    * Add a new schedule
    */
-  async addNewSchedule(data) {
+  async addNewSchedule(data: ScheduleEntry) {
     await this.addNewScheduleButton.click();
 
     await this._fillScheduleFields(data);
@@ -23,7 +35,7 @@ export class SchedulesPage {
    * Retrieve the row element for the nth-schedule.
    * 0-based index
    */
-  getNthScheduleRow(index) {
+  getNthScheduleRow(index: number) {
     return this.schedulesTableRow.nth(index);
   }
 
@@ -31,7 +43,7 @@ export class SchedulesPage {
    * Retrieve the data for the nth-schedule.
    * 0-based index
    */
-  getNthSchedule(index) {
+  getNthSchedule(index: number) {
     const row = this.getNthScheduleRow(index);
 
     return {
@@ -47,7 +59,7 @@ export class SchedulesPage {
    * Create a transaction for the nth-schedule.
    * 0-based index
    */
-  async postNthSchedule(index) {
+  async postNthSchedule(index: number) {
     await this._performNthAction(index, 'Post transaction today');
     await this.page.waitForTimeout(1000);
   }
@@ -56,12 +68,12 @@ export class SchedulesPage {
    * Complete the nth-schedule.
    * 0-based index
    */
-  async completeNthSchedule(index) {
+  async completeNthSchedule(index: number) {
     await this._performNthAction(index, 'Complete');
     await this.page.waitForTimeout(1000);
   }
 
-  async _performNthAction(index, actionName) {
+  async _performNthAction(index: number, actionName: string | RegExp) {
     const row = this.getNthScheduleRow(index);
     const actions = row.getByTestId('actions');
 
@@ -69,7 +81,7 @@ export class SchedulesPage {
     await this.page.getByRole('button', { name: actionName }).click();
   }
 
-  async _fillScheduleFields(data) {
+  async _fillScheduleFields(data: ScheduleEntry) {
     if (data.payee) {
       await this.page.getByRole('textbox', { name: 'Payee' }).fill(data.payee);
       await this.page.keyboard.press('Enter');
diff --git a/packages/desktop-client/e2e/page-models/settings-page.js b/packages/desktop-client/e2e/page-models/settings-page.ts
similarity index 66%
rename from packages/desktop-client/e2e/page-models/settings-page.js
rename to packages/desktop-client/e2e/page-models/settings-page.ts
index 96045c30043..42c1f329191 100644
--- a/packages/desktop-client/e2e/page-models/settings-page.js
+++ b/packages/desktop-client/e2e/page-models/settings-page.ts
@@ -1,5 +1,14 @@
+import { type Locator, type Page } from '@playwright/test';
+
 export class SettingsPage {
-  constructor(page) {
+  readonly page: Page;
+  readonly settings: Locator;
+  readonly exportDataButton: Locator;
+  readonly switchBudgetTypeButton: Locator;
+  readonly advancedSettingsButton: Locator;
+  readonly experimentalSettingsButton: Locator;
+
+  constructor(page: Page) {
     this.page = page;
     this.settings = page.getByTestId('settings');
     this.exportDataButton = this.settings.getByRole('button', {
@@ -15,24 +24,24 @@ export class SettingsPage {
     );
   }
 
-  async waitFor(options) {
-    await this.settings.waitFor(options);
+  async waitFor(...options: Parameters<Locator['waitFor']>) {
+    await this.settings.waitFor(...options);
   }
 
   async exportData() {
     await this.exportDataButton.click();
   }
 
-  async useBudgetType(budgetType) {
+  async useBudgetType(budgetType: 'Envelope' | 'Tracking') {
     await this.switchBudgetTypeButton.waitFor();
 
     const buttonText = await this.switchBudgetTypeButton.textContent();
-    if (buttonText.includes(budgetType.toLowerCase())) {
+    if (buttonText?.includes(budgetType.toLowerCase())) {
       await this.switchBudgetTypeButton.click();
     }
   }
 
-  async enableExperimentalFeature(featureName) {
+  async enableExperimentalFeature(featureName: string) {
     if (await this.advancedSettingsButton.isVisible()) {
       await this.advancedSettingsButton.click();
     }
diff --git a/packages/desktop-client/e2e/transactions.test.ts b/packages/desktop-client/e2e/transactions.test.ts
index 1b444b707d5..375605324ef 100644
--- a/packages/desktop-client/e2e/transactions.test.ts
+++ b/packages/desktop-client/e2e/transactions.test.ts
@@ -40,7 +40,7 @@ test.describe('Transactions', () => {
 
     test('by date', async () => {
       const filterTooltip = await accountPage.filterBy('Date');
-      await expect(filterTooltip.page).toMatchThemeScreenshots();
+      await expect(filterTooltip.locator).toMatchThemeScreenshots();
 
       // Open datepicker
       await page.keyboard.press('Space');
@@ -58,7 +58,7 @@ test.describe('Transactions', () => {
 
     test('by category', async () => {
       const filterTooltip = await accountPage.filterBy('Category');
-      await expect(filterTooltip.page).toMatchThemeScreenshots();
+      await expect(filterTooltip.locator).toMatchThemeScreenshots();
 
       // Type in the autocomplete box
       const autocomplete = page.getByTestId('autocomplete');
diff --git a/upcoming-release-notes/4218.md b/upcoming-release-notes/4218.md
new file mode 100644
index 00000000000..e0128c7b0fe
--- /dev/null
+++ b/upcoming-release-notes/4218.md
@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [joel-jeremy]
+---
+
+Convert playwright page models to TypeScript.