diff --git a/src/ROUTES.js b/src/ROUTES.ts
similarity index 64%
rename from src/ROUTES.js
rename to src/ROUTES.ts
index b38ce25f590f..3ea8bd868d6a 100644
--- a/src/ROUTES.js
+++ b/src/ROUTES.ts
@@ -1,10 +1,16 @@
-import lodashGet from 'lodash/get';
+import {ValueOf} from 'type-fest';
 import * as Url from './libs/Url';
+import CONST from './CONST';
 
 /**
  * This is a file containing constants for all of the routes we want to be able to go to
  */
 
+type ParseReportRouteParams = {
+    reportID: string;
+    isSubReportPageRoute: boolean;
+};
+
 const REPORT = 'r';
 const IOU_REQUEST = 'request/new';
 const IOU_BILL = 'split/new';
@@ -20,7 +26,7 @@ export default {
     BANK_ACCOUNT_NEW: 'bank-account/new',
     BANK_ACCOUNT_WITH_STEP_TO_OPEN: 'bank-account/:stepToOpen?',
     BANK_ACCOUNT_PERSONAL: 'bank-account/personal',
-    getBankAccountRoute: (stepToOpen = '', policyID = '', backTo = '') => {
+    getBankAccountRoute: (stepToOpen = '', policyID = '', backTo = ''): string => {
         const backToParam = backTo ? `&backTo=${encodeURIComponent(backTo)}` : '';
         return `bank-account/${stepToOpen}?policyID=${policyID}${backToParam}`;
     },
@@ -47,7 +53,7 @@ export default {
     SETTINGS_ADD_DEBIT_CARD: 'settings/wallet/add-debit-card',
     SETTINGS_ADD_BANK_ACCOUNT: 'settings/wallet/add-bank-account',
     SETTINGS_ENABLE_PAYMENTS: 'settings/wallet/enable-payments',
-    getSettingsAddLoginRoute: (type) => `settings/addlogin/${type}`,
+    getSettingsAddLoginRoute: (type: string) => `settings/addlogin/${type}`,
     SETTINGS_WALLET_TRANSFER_BALANCE: 'settings/wallet/transfer-balance',
     SETTINGS_WALLET_CHOOSE_TRANSFER_ACCOUNT: 'settings/wallet/choose-transfer-account',
     SETTINGS_PERSONAL_DETAILS,
@@ -56,7 +62,7 @@ export default {
     SETTINGS_PERSONAL_DETAILS_ADDRESS: `${SETTINGS_PERSONAL_DETAILS}/address`,
     SETTINGS_CONTACT_METHODS,
     SETTINGS_CONTACT_METHOD_DETAILS: `${SETTINGS_CONTACT_METHODS}/:contactMethod/details`,
-    getEditContactMethodRoute: (contactMethod) => `${SETTINGS_CONTACT_METHODS}/${encodeURIComponent(contactMethod)}/details`,
+    getEditContactMethodRoute: (contactMethod: string) => `${SETTINGS_CONTACT_METHODS}/${encodeURIComponent(contactMethod)}/details`,
     SETTINGS_NEW_CONTACT_METHOD: `${SETTINGS_CONTACT_METHODS}/new`,
     SETTINGS_2FA: 'settings/security/two-factor-auth',
     SETTINGS_STATUS,
@@ -67,14 +73,14 @@ export default {
     REPORT,
     REPORT_WITH_ID: 'r/:reportID/:reportActionID?',
     EDIT_REQUEST: 'r/:threadReportID/edit/:field',
-    getEditRequestRoute: (threadReportID, field) => `r/${threadReportID}/edit/${field}`,
+    getEditRequestRoute: (threadReportID: string, field: ValueOf<typeof CONST.EDIT_REQUEST_FIELD>) => `r/${threadReportID}/edit/${field}`,
     EDIT_CURRENCY_REQUEST: 'r/:threadReportID/edit/currency',
-    getEditRequestCurrencyRoute: (threadReportID, currency, backTo) => `r/${threadReportID}/edit/currency?currency=${currency}&backTo=${backTo}`,
-    getReportRoute: (reportID) => `r/${reportID}`,
+    getEditRequestCurrencyRoute: (threadReportID: string, currency: string, backTo: string) => `r/${threadReportID}/edit/currency?currency=${currency}&backTo=${backTo}`,
+    getReportRoute: (reportID: string) => `r/${reportID}`,
     REPORT_WITH_ID_DETAILS_SHARE_CODE: 'r/:reportID/details/shareCode',
-    getReportShareCodeRoute: (reportID) => `r/${reportID}/details/shareCode`,
+    getReportShareCodeRoute: (reportID: string) => `r/${reportID}/details/shareCode`,
     REPORT_ATTACHMENTS: 'r/:reportID/attachment',
-    getReportAttachmentRoute: (reportID, source) => `r/${reportID}/attachment?source=${encodeURI(source)}`,
+    getReportAttachmentRoute: (reportID: string, source: string) => `r/${reportID}/attachment?source=${encodeURI(source)}`,
 
     /** This is a utility route used to go to the user's concierge chat, or the sign-in page if the user's not authenticated */
     CONCIERGE: 'concierge',
@@ -100,64 +106,61 @@ export default {
     IOU_SEND_ADD_BANK_ACCOUNT: `${IOU_SEND}/add-bank-account`,
     IOU_SEND_ADD_DEBIT_CARD: `${IOU_SEND}/add-debit-card`,
     IOU_SEND_ENABLE_PAYMENTS: `${IOU_SEND}/enable-payments`,
-    getMoneyRequestRoute: (iouType, reportID = '') => `${iouType}/new/${reportID}`,
-    getMoneyRequestAmountRoute: (iouType, reportID = '') => `${iouType}/new/amount/${reportID}`,
-    getMoneyRequestParticipantsRoute: (iouType, reportID = '') => `${iouType}/new/participants/${reportID}`,
-    getMoneyRequestConfirmationRoute: (iouType, reportID = '') => `${iouType}/new/confirmation/${reportID}`,
-    getMoneyRequestCreatedRoute: (iouType, reportID = '') => `${iouType}/new/date/${reportID}`,
-    getMoneyRequestCurrencyRoute: (iouType, reportID = '', currency, backTo) => `${iouType}/new/currency/${reportID}?currency=${currency}&backTo=${backTo}`,
-    getMoneyRequestDescriptionRoute: (iouType, reportID = '') => `${iouType}/new/description/${reportID}`,
-    getMoneyRequestCategoryRoute: (iouType, reportID = '') => `${iouType}/new/category/${reportID}`,
-    getMoneyRequestMerchantRoute: (iouType, reportID = '') => `${iouType}/new/merchant/${reportID}`,
-    getMoneyRequestDistanceTabRoute: (iouType, reportID = '') => `${iouType}/new/${reportID}/distance`,
-    getMoneyRequestWaypointRoute: (iouType, waypointIndex) => `${iouType}/new/waypoint/${waypointIndex}`,
+    getMoneyRequestRoute: (iouType: string, reportID = '') => `${iouType}/new/${reportID}`,
+    getMoneyRequestAmountRoute: (iouType: string, reportID = '') => `${iouType}/new/amount/${reportID}`,
+    getMoneyRequestParticipantsRoute: (iouType: string, reportID = '') => `${iouType}/new/participants/${reportID}`,
+    getMoneyRequestConfirmationRoute: (iouType: string, reportID = '') => `${iouType}/new/confirmation/${reportID}`,
+    getMoneyRequestCreatedRoute: (iouType: string, reportID = '') => `${iouType}/new/date/${reportID}`,
+    getMoneyRequestCurrencyRoute: (iouType: string, reportID: string, currency: string, backTo: string) => `${iouType}/new/currency/${reportID}?currency=${currency}&backTo=${backTo}`,
+    getMoneyRequestDescriptionRoute: (iouType: string, reportID = '') => `${iouType}/new/description/${reportID}`,
+    getMoneyRequestCategoryRoute: (iouType: string, reportID = '') => `${iouType}/new/category/${reportID}`,
     SPLIT_BILL_DETAILS: `r/:reportID/split/:reportActionID`,
-    getSplitBillDetailsRoute: (reportID, reportActionID) => `r/${reportID}/split/${reportActionID}`,
-    getNewTaskRoute: (reportID) => `${NEW_TASK}/${reportID}`,
+    getSplitBillDetailsRoute: (reportID: string, reportActionID: string) => `r/${reportID}/split/${reportActionID}`,
+    getNewTaskRoute: (reportID: string) => `${NEW_TASK}/${reportID}`,
     NEW_TASK_WITH_REPORT_ID: `${NEW_TASK}/:reportID?`,
     TASK_TITLE: 'r/:reportID/title',
     TASK_DESCRIPTION: 'r/:reportID/description',
     TASK_ASSIGNEE: 'r/:reportID/assignee',
-    getTaskReportTitleRoute: (reportID) => `r/${reportID}/title`,
-    getTaskReportDescriptionRoute: (reportID) => `r/${reportID}/description`,
-    getTaskReportAssigneeRoute: (reportID) => `r/${reportID}/assignee`,
+    getTaskReportTitleRoute: (reportID: string) => `r/${reportID}/title`,
+    getTaskReportDescriptionRoute: (reportID: string) => `r/${reportID}/description`,
+    getTaskReportAssigneeRoute: (reportID: string) => `r/${reportID}/assignee`,
     NEW_TASK_ASSIGNEE: `${NEW_TASK}/assignee`,
     NEW_TASK_SHARE_DESTINATION: `${NEW_TASK}/share-destination`,
     NEW_TASK_DETAILS: `${NEW_TASK}/details`,
     NEW_TASK_TITLE: `${NEW_TASK}/title`,
     NEW_TASK_DESCRIPTION: `${NEW_TASK}/description`,
     FLAG_COMMENT: `flag/:reportID/:reportActionID`,
-    getFlagCommentRoute: (reportID, reportActionID) => `flag/${reportID}/${reportActionID}`,
+    getFlagCommentRoute: (reportID: string, reportActionID: string) => `flag/${reportID}/${reportActionID}`,
     SEARCH: 'search',
     SAVE_THE_WORLD: 'save-the-world',
     I_KNOW_A_TEACHER: 'save-the-world/i-know-a-teacher',
     INTRO_SCHOOL_PRINCIPAL: 'save-the-world/intro-school-principal',
     I_AM_A_TEACHER: 'save-the-world/i-am-a-teacher',
     DETAILS: 'details',
-    getDetailsRoute: (login) => `details?login=${encodeURIComponent(login)}`,
+    getDetailsRoute: (login: string) => `details?login=${encodeURIComponent(login)}`,
     PROFILE: 'a/:accountID',
-    getProfileRoute: (accountID, backTo = '') => {
+    getProfileRoute: (accountID: string | number, backTo = '') => {
         const backToParam = backTo ? `?backTo=${encodeURIComponent(backTo)}` : '';
         return `a/${accountID}${backToParam}`;
     },
     REPORT_PARTICIPANTS: 'r/:reportID/participants',
-    getReportParticipantsRoute: (reportID) => `r/${reportID}/participants`,
+    getReportParticipantsRoute: (reportID: string) => `r/${reportID}/participants`,
     REPORT_WITH_ID_DETAILS: 'r/:reportID/details',
-    getReportDetailsRoute: (reportID) => `r/${reportID}/details`,
+    getReportDetailsRoute: (reportID: string) => `r/${reportID}/details`,
     REPORT_SETTINGS: 'r/:reportID/settings',
-    getReportSettingsRoute: (reportID) => `r/${reportID}/settings`,
+    getReportSettingsRoute: (reportID: string) => `r/${reportID}/settings`,
     REPORT_SETTINGS_ROOM_NAME: 'r/:reportID/settings/room-name',
-    getReportSettingsRoomNameRoute: (reportID) => `r/${reportID}/settings/room-name`,
+    getReportSettingsRoomNameRoute: (reportID: string) => `r/${reportID}/settings/room-name`,
     REPORT_SETTINGS_NOTIFICATION_PREFERENCES: 'r/:reportID/settings/notification-preferences',
-    getReportSettingsNotificationPreferencesRoute: (reportID) => `r/${reportID}/settings/notification-preferences`,
+    getReportSettingsNotificationPreferencesRoute: (reportID: string) => `r/${reportID}/settings/notification-preferences`,
     REPORT_WELCOME_MESSAGE: 'r/:reportID/welcomeMessage',
-    getReportWelcomeMessageRoute: (reportID) => `r/${reportID}/welcomeMessage`,
+    getReportWelcomeMessageRoute: (reportID: string) => `r/${reportID}/welcomeMessage`,
     REPORT_SETTINGS_WRITE_CAPABILITY: 'r/:reportID/settings/who-can-post',
-    getReportSettingsWriteCapabilityRoute: (reportID) => `r/${reportID}/settings/who-can-post`,
+    getReportSettingsWriteCapabilityRoute: (reportID: string) => `r/${reportID}/settings/who-can-post`,
     TRANSITION_BETWEEN_APPS: 'transition',
     VALIDATE_LOGIN: 'v/:accountID/:validateCode',
     GET_ASSISTANCE: 'get-assistance/:taskID',
-    getGetAssistanceRoute: (taskID) => `get-assistance/${taskID}`,
+    getGetAssistanceRoute: (taskID: string) => `get-assistance/${taskID}`,
     UNLINK_LOGIN: 'u/:accountID/:validateCode',
 
     APPLE_SIGN_IN: 'sign-in-with-apple',
@@ -168,7 +171,7 @@ export default {
     // when linking users from e.com in order to share a session in this app.
     ENABLE_PAYMENTS: 'enable-payments',
     WALLET_STATEMENT_WITH_DATE: 'statements/:yearMonth',
-    getWalletStatementWithDateRoute: (yearMonth) => `statements/${yearMonth}`,
+    getWalletStatementWithDateRoute: (yearMonth: string) => `statements/${yearMonth}`,
     WORKSPACE_NEW: 'workspace/new',
     WORKSPACE_INITIAL: 'workspace/:policyID',
     WORKSPACE_INVITE: 'workspace/:policyID/invite',
@@ -182,27 +185,23 @@ export default {
     WORKSPACE_TRAVEL: 'workspace/:policyID/travel',
     WORKSPACE_MEMBERS: 'workspace/:policyID/members',
     WORKSPACE_NEW_ROOM: 'workspace/new-room',
-    getWorkspaceInitialRoute: (policyID) => `workspace/${policyID}`,
-    getWorkspaceInviteRoute: (policyID) => `workspace/${policyID}/invite`,
-    getWorkspaceInviteMessageRoute: (policyID) => `workspace/${policyID}/invite-message`,
-    getWorkspaceSettingsRoute: (policyID) => `workspace/${policyID}/settings`,
-    getWorkspaceCardRoute: (policyID) => `workspace/${policyID}/card`,
-    getWorkspaceReimburseRoute: (policyID) => `workspace/${policyID}/reimburse`,
-    getWorkspaceRateAndUnitRoute: (policyID) => `workspace/${policyID}/rateandunit`,
-    getWorkspaceBillsRoute: (policyID) => `workspace/${policyID}/bills`,
-    getWorkspaceInvoicesRoute: (policyID) => `workspace/${policyID}/invoices`,
-    getWorkspaceTravelRoute: (policyID) => `workspace/${policyID}/travel`,
-    getWorkspaceMembersRoute: (policyID) => `workspace/${policyID}/members`,
+    getWorkspaceInitialRoute: (policyID: string) => `workspace/${policyID}`,
+    getWorkspaceInviteRoute: (policyID: string) => `workspace/${policyID}/invite`,
+    getWorkspaceInviteMessageRoute: (policyID: string) => `workspace/${policyID}/invite-message`,
+    getWorkspaceSettingsRoute: (policyID: string) => `workspace/${policyID}/settings`,
+    getWorkspaceCardRoute: (policyID: string) => `workspace/${policyID}/card`,
+    getWorkspaceReimburseRoute: (policyID: string) => `workspace/${policyID}/reimburse`,
+    getWorkspaceRateAndUnitRoute: (policyID: string) => `workspace/${policyID}/rateandunit`,
+    getWorkspaceBillsRoute: (policyID: string) => `workspace/${policyID}/bills`,
+    getWorkspaceInvoicesRoute: (policyID: string) => `workspace/${policyID}/invoices`,
+    getWorkspaceTravelRoute: (policyID: string) => `workspace/${policyID}/travel`,
+    getWorkspaceMembersRoute: (policyID: string) => `workspace/${policyID}/members`,
 
     // These are some on-off routes that will be removed once they're no longer needed (see GH issues for details)
     SAASTR: 'saastr',
     SBE: 'sbe',
 
-    /**
-     * @param {String} route
-     * @returns {Object}
-     */
-    parseReportRouteParams: (route) => {
+    parseReportRouteParams: (route: string): ParseReportRouteParams => {
         let parsingRoute = route;
         if (parsingRoute.at(0) === '/') {
             // remove the first slash
@@ -215,9 +214,9 @@ export default {
 
         const pathSegments = parsingRoute.split('/');
         return {
-            reportID: lodashGet(pathSegments, 1),
+            reportID: pathSegments[1],
             isSubReportPageRoute: pathSegments.length > 2,
         };
     },
     SIGN_IN_MODAL: 'sign-in-modal',
-};
+} as const;