Remove all `let` exports in favor of `const` exports.

frontend/__test_support__/fake_state/bot.ts

@@ -1,6 +1,6 @@
 import { Everything } from "../../interfaces";
 
-export let bot: Everything["bot"] = {
+export const bot: Everything["bot"] = {
   "consistent": true,
   "stepSize": 100,
   "controlPanelState": {

frontend/__test_support__/fake_state/config.ts

@@ -1,6 +1,6 @@
 import { Everything } from "../../interfaces";
 
-export let config: Everything["config"] = {
+export const config: Everything["config"] = {
   "host": "localhost",
   "port": "3000"
 };

frontend/__test_support__/fake_state/draggable.ts

@@ -1,5 +1,5 @@
 import { Everything } from "../../interfaces";
 
-export let draggable: Everything["draggable"] = {
+export const draggable: Everything["draggable"] = {
   "dataTransfer": {}
 };

frontend/__test_support__/fake_state/images.ts

@@ -1,6 +1,6 @@
 import { TaggedImage, SpecialStatus } from "farmbot";
 
-export let fakeImages: TaggedImage[] = [
+export const fakeImages: TaggedImage[] = [
   {
     "kind": "Image",
     "specialStatus": SpecialStatus.SAVED,

frontend/__test_support__/fake_state/peripherals.ts

@@ -1,5 +1,5 @@
 import { Everything } from "../../interfaces";
 
-export let peripherals: Everything["Peripheral"] = {
+export const peripherals: Everything["Peripheral"] = {
   "isEditing": true
 };

frontend/__test_support__/fake_state/resources.ts

@@ -34,7 +34,7 @@ import {
 import { FirmwareConfig } from "farmbot/dist/resources/configs/firmware";
 import { MessageType } from "../../sequences/interfaces";
 
-export let resources: Everything["resources"] = buildResourceIndex();
+export const resources: Everything["resources"] = buildResourceIndex();
 let idCounter = 1;
 
 export function fakeSequence(): TaggedSequence {

frontend/__test_support__/fake_state/token.ts

@@ -1,6 +1,6 @@
 import { AuthState } from "../../auth/interfaces";
 
-export let auth: AuthState = {
+export const auth: AuthState = {
   "token": {
     "unencoded": {
       "jti": "xyz",

frontend/__test_support__/farm_event_calendar_support.ts

@@ -12,7 +12,7 @@ export const TIME = {
   SATURDAY: moment("2017-06-24T06:30:00.000-05:00")
 };
 
-export let fakeFarmEventWithExecutable = (): FarmEventWithExecutable => {
+export const fakeFarmEventWithExecutable = (): FarmEventWithExecutable => {
   return {
     id: 1,
     start_time: "---",
@@ -29,7 +29,7 @@ export let fakeFarmEventWithExecutable = (): FarmEventWithExecutable => {
   };
 };
 
-export let calendarRows = [
+export const calendarRows = [
   {
     "sortKey": 1500922800,
     "year": 17,

frontend/__test_support__/resource_index_builder.ts

@@ -328,7 +328,7 @@ const log: TaggedLog = {
   uuid: "Log.1091396.70"
 };
 
-export let FAKE_RESOURCES: TaggedResource[] = [
+export const FAKE_RESOURCES: TaggedResource[] = [
   tr1,
   fakeDevice(),
   tr2,

frontend/__test_support__/user.ts

@@ -1,7 +1,7 @@
 import { User } from "farmbot/dist/resources/api_resources";
 import { TaggedUser, SpecialStatus } from "farmbot";
 
-export let user: User = {
+export const user: User = {
   created_at: "2016-10-05T03:02:58.000Z",
   email: "farmbot1@farmbot.io",
   id: 2,
@@ -9,7 +9,7 @@ export let user: User = {
   updated_at: "2017-08-04T19:53:29.724Z"
 };
 
-export let taggedUser: TaggedUser = {
+export const taggedUser: TaggedUser = {
   kind: "User",
   uuid: "1234-5678",
   specialStatus: SpecialStatus.SAVED,

frontend/auth/reducer.ts

@@ -2,7 +2,7 @@ import { AuthState } from "./interfaces";
 import { generateReducer } from "../redux/generate_reducer";
 import { Actions } from "../constants";
 
-export let authReducer = generateReducer<AuthState | undefined>(undefined)
+export const authReducer = generateReducer<AuthState | undefined>(undefined)
   .add<AuthState>(Actions.REPLACE_TOKEN, (_, { payload }) => {
     return payload;
   });

frontend/config/reducer.ts

@@ -10,7 +10,7 @@ const initialState: ConfigState = {
   port: API.inferPort()
 };
 
-export let configReducer = generateReducer<ConfigState>(initialState)
+export const configReducer = generateReducer<ConfigState>(initialState)
   .add<ChangeApiPort>(Actions.CHANGE_API_PORT, (s, { payload }) => {
     s.port = payload.port.replace(/\D/g, "");
     return s;

frontend/connectivity/actions.ts

@@ -14,4 +14,4 @@ const change = (state: "up" | "down") =>
 
 export const networkUp = change("up");
 
-export let networkDown = change("down");
+export const networkDown = change("down");

frontend/connectivity/connect_device.ts

@@ -202,6 +202,6 @@ export const attachEventListeners =
   };
 
 /** Connect to MQTT and attach all relevant event handlers. */
-export let connectDevice = (token: AuthState) =>
+export const connectDevice = (token: AuthState) =>
   (dispatch: Function, getState: GetState) => fetchNewDevice(token)
     .then(bot => attachEventListeners(bot, dispatch, getState), onOffline);

frontend/connectivity/index.ts

@@ -37,13 +37,13 @@ export const dispatchQosStart = (id: string) => {
   });
 };
 
-export let dispatchNetworkUp = (edge: Edge, at: number) => {
+export const dispatchNetworkUp = (edge: Edge, at: number) => {
   if (shouldThrottle(edge, at)) { return; }
   store.dispatch(networkUp(edge, at));
   bumpThrottle(edge, at);
 };
 
-export let dispatchNetworkDown = (edge: Edge, at: number) => {
+export const dispatchNetworkDown = (edge: Edge, at: number) => {
   if (shouldThrottle(edge, at)) { return; }
   store.dispatch(networkDown(edge, at));
   bumpThrottle(edge, at);

frontend/connectivity/reducer.ts

@@ -17,7 +17,7 @@ export const DEFAULT_STATE: ConnectionState = {
 };
 export type PingResultPayload = { id: string, at: number };
 
-export let connectivityReducer =
+export const connectivityReducer =
   generateReducer<ConnectionState>(DEFAULT_STATE)
     .add<{ id: string }>(Actions.PING_START, (s, { payload }) => {
       return { ...s, pings: startPing(s.pings, payload.id) };

frontend/controls/axis_display_group.tsx

@@ -8,7 +8,7 @@ const Axis = ({ val }: { val: number | undefined }) => <Col xs={3}>
   <input disabled value={isNumber(val) ? val : "---"} />
 </Col>;
 
-export let AxisDisplayGroup = ({ position, label }: AxisDisplayGroupProps) => {
+export const AxisDisplayGroup = ({ position, label }: AxisDisplayGroupProps) => {
   const { x, y, z } = position;
   return <Row>
     <Axis val={x} />

frontend/controls/axis_input_box.tsx

@@ -3,7 +3,7 @@ import { AxisInputBoxProps } from "./interfaces";
 import { Col, BlurableInput } from "../ui/index";
 import { isUndefined } from "lodash";
 
-export let AxisInputBox = ({ onChange, value, axis }: AxisInputBoxProps) => {
+export const AxisInputBox = ({ onChange, value, axis }: AxisInputBoxProps) => {
   return <Col xs={3}>
     <BlurableInput
       value={(isUndefined(value) ? "" : value)}

frontend/devices/actions.ts

@@ -245,7 +245,7 @@ function validMinOsFeatureLookup(x: MinOsFeatureLookup): boolean {
  * Fetch and save minimum FBOS version data for UI feature display.
  * @param url location of data
  */
-export let fetchMinOsFeatureData = (url: string) =>
+export const fetchMinOsFeatureData = (url: string) =>
   (dispatch: Function) => {
     axios
       .get<MinOsFeatureLookup>(url)

frontend/devices/components/hardware_settings/header.tsx

@@ -10,7 +10,7 @@ interface Props {
   expanded: boolean;
 }
 
-export let Header = (props: Props) => {
+export const Header = (props: Props) => {
   const { dispatch, name, title, expanded } = props;
   return <ExpandableHeader
     expanded={expanded}

frontend/devices/reducer.ts

@@ -18,7 +18,7 @@ const afterEach = (state: BotState, a: ReduxAction<{}>) => {
   return state;
 };
 
-export let initialState = (): BotState => ({
+export const initialState = (): BotState => ({
   consistent: true,
   stepSize: 100,
   controlPanelState: {
@@ -81,7 +81,7 @@ export let initialState = (): BotState => ({
   }
 });
 
-export let botReducer = generateReducer<BotState>(initialState())
+export const botReducer = generateReducer<BotState>(initialState())
   .afterEach(afterEach)
   .add<boolean>(Actions.SET_CONSISTENCY, (s, a) => {
     s.consistent = a.payload;

frontend/devices/timezones/tz_list.ts

@@ -1,4 +1,4 @@
-export let list = ["Africa/Abidjan",
+export const list = ["Africa/Abidjan",
   "Africa/Accra",
   "Africa/Addis_Ababa",
   "Africa/Algiers",

frontend/draggable/reducer.ts

@@ -6,7 +6,7 @@ const INITIAL_STATE: DraggableState = {
   dataTransfer: {}
 };
 
-export let draggableReducer = generateReducer<DraggableState>(INITIAL_STATE)
+export const draggableReducer = generateReducer<DraggableState>(INITIAL_STATE)
   .add<DataXfer>(Actions.PUT_DATA_XFER, (s, { payload }) => {
     s.dataTransfer[payload.uuid] = payload;
     return s;

frontend/draggable/step_dragger.tsx

@@ -18,7 +18,7 @@ export const NULL_DRAGGER_ID = 0xCAFEF00D;
  *   Drag this!
  * </button>
  * */
-export let stepDragEventHandler = (dispatch: Function,
+export const stepDragEventHandler = (dispatch: Function,
   step: Step,
   intent: DataXferIntent,
   draggerId: number) => {

frontend/farm_designer/farm_events/farm_events.tsx

@@ -161,4 +161,4 @@ export class PureFarmEvents
  * It avoids mocking `connect` in unit tests.
  * See testing pattern noted here: https://github.com/airbnb/enzyme/issues/98
  */
-export let FarmEvents = connect(mapStateToProps)(PureFarmEvents);
+export const FarmEvents = connect(mapStateToProps)(PureFarmEvents);

frontend/farm_designer/farm_events/map_state_to_props.ts

@@ -65,7 +65,7 @@ export const nextRegItemTimes =
       && time.isSameOrAfter(moment(startTime)));
   };
 
-export let regimenCalendarAdder = (
+export const regimenCalendarAdder = (
   index: ResourceIndex, timeSettings: TimeSettings) =>
   (f: FarmEventWithRegimen, c: Calendar, now = moment()) => {
     const { regimen_items } = f.executable;
@@ -96,7 +96,7 @@ export let regimenCalendarAdder = (
     }
   };
 
-export let addSequenceToCalendar =
+export const addSequenceToCalendar =
   (f: FarmEventWithSequence, c: Calendar, timeSettings: TimeSettings,
     now = moment()) => {
     const schedule = scheduleForFarmEvent(f, now);

frontend/farm_designer/farm_events/map_state_to_props_add_edit.ts

@@ -36,17 +36,17 @@ import { getFbosConfig } from "../../resources/getters";
 import { t } from "../../i18next_wrapper";
 import { DevSettings } from "../../account/dev/dev_support";
 
-export let formatTime = (input: string, timeSettings: TimeSettings) => {
+export const formatTime = (input: string, timeSettings: TimeSettings) => {
   const iso = new Date(input).toISOString();
   return moment(iso).utcOffset(timeSettings.utcOffset).format("HH:mm");
 };
 
-export let formatDate = (input: string, timeSettings: TimeSettings) => {
+export const formatDate = (input: string, timeSettings: TimeSettings) => {
   const iso = new Date(input).toISOString();
   return moment(iso).utcOffset(timeSettings.utcOffset).format("YYYY-MM-DD");
 };
 
-export let repeatOptions = [
+export const repeatOptions = [
   { label: t("Minutes"), value: "minutely", name: "time_unit" },
   { label: t("Hours"), value: "hourly", name: "time_unit" },
   { label: t("Days"), value: "daily", name: "time_unit" },

frontend/farm_designer/openfarm.ts

@@ -68,8 +68,8 @@ export namespace OpenFarm {
     attributes: ImageAttrs;
   }
 
-  export let cropUrl = "https://openfarm.cc/api/v1/crops";
-  export let browsingCropUrl = "https://openfarm.cc/crops/";
+  export const cropUrl = "https://openfarm.cc/api/v1/crops";
+  export const browsingCropUrl = "https://openfarm.cc/crops/";
 }
 /** Returned by https://openfarm.cc/api/v1/crops?filter=q */
 export interface CropSearchResult {

frontend/farm_designer/reducer.ts

@@ -7,7 +7,7 @@ import { Actions } from "../constants";
 import { BotPosition } from "../devices/interfaces";
 import { PointGroupSortType } from "farmbot/dist/resources/api_resources";
 
-export let initialState: DesignerState = {
+export const initialState: DesignerState = {
   selectedPlants: undefined,
   hoveredPlant: {
     plantUUID: undefined,
@@ -24,7 +24,7 @@ export let initialState: DesignerState = {
   tryGroupSortType: undefined,
 };
 
-export let designer = generateReducer<DesignerState>(initialState)
+export const designer = generateReducer<DesignerState>(initialState)
   .add<string>(Actions.SEARCH_QUERY_CHANGE, (s, { payload }) => {
     s.cropSearchInProgress = true;
     const state = cloneDeep(s);

frontend/farm_designer/util.ts

@@ -15,7 +15,7 @@ interface IdURL {
 }
 
 const FALLBACK: OpenFarm.Included[] = [];
-export let OFSearch = (searchTerm: string) =>
+export const OFSearch = (searchTerm: string) =>
   (dispatch: Function) => {
     dispatch({ type: Actions.OF_SEARCH_RESULTS_START, payload: undefined });
     openFarmSearchQuery(searchTerm)

frontend/farmware/reducer.ts

@@ -3,14 +3,14 @@ import { FarmwareState } from "./interfaces";
 import { TaggedResource } from "farmbot";
 import { Actions } from "../constants";
 
-export let farmwareState: FarmwareState = {
+export const farmwareState: FarmwareState = {
   currentFarmware: undefined,
   currentImage: undefined,
   firstPartyFarmwareNames: [],
   infoOpen: false,
 };
 
-export let farmwareReducer = generateReducer<FarmwareState>(farmwareState)
+export const farmwareReducer = generateReducer<FarmwareState>(farmwareState)
   .add<TaggedResource>(Actions.INIT_RESOURCE, (s, { payload }) => {
     if (payload.kind === "Image") {
       s.currentImage = payload.uuid;

frontend/farmware/weed_detector/selectors.ts

@@ -5,14 +5,14 @@ import { envGet } from "./remote_env/selectors";
 
 /** Convert values like SPECIAL_VALUES.TRUE to drop down items with friendly
  * label/value pairs. */
-export let translateSpecialValue = (input: number): DropDownItem => {
+export const translateSpecialValue = (input: number): DropDownItem => {
   return SPECIAL_VALUE_DDI[input] || NULL_CHOICE;
 };
 
 /** Generates a lookup function to convert WeedDetector ENV items to
  * DropDownItems. Used to display currently selected options within dropdown
  * menus. */
-export let getDropdownSelection = (env: Partial<WD_ENV>) =>
+export const getDropdownSelection = (env: Partial<WD_ENV>) =>
   (key: keyof WD_ENV): DropDownItem => {
     return translateSpecialValue(envGet(key, env));
   };

frontend/help/reducer.ts

@@ -5,11 +5,11 @@ export interface HelpState {
   currentTour: string | undefined;
 }
 
-export let initialState: HelpState = {
+export const initialState: HelpState = {
   currentTour: undefined,
 };
 
-export let helpReducer = generateReducer<HelpState>(initialState)
+export const helpReducer = generateReducer<HelpState>(initialState)
   .add<string>(Actions.START_TOUR, (s, { payload }) => {
     s.currentTour = payload;
     return s;

frontend/interceptor_support.ts

@@ -2,13 +2,13 @@ import { DataChangeType, Dictionary } from "farmbot/dist";
 import { box } from "boxed_value";
 import { isNumber, isNaN } from "lodash";
 
-export let METHOD_MAP: Dictionary<DataChangeType> = {
+export const METHOD_MAP: Dictionary<DataChangeType> = {
   "post": "add",
   "put": "update",
   "patch": "update",
   "delete": "remove"
 };
-export let METHODS = ["post", "put", "patch", "delete"];
+export const METHODS = ["post", "put", "patch", "delete"];
 
 /** More nasty hacks until we have time to implement proper API push state
  * notifications. */

frontend/nav/mobile_menu.tsx

@@ -5,7 +5,7 @@ import { MobileMenuProps } from "./interfaces";
 
 const classes = [Classes.CARD, Classes.ELEVATION_4, "mobile-menu"];
 
-export let MobileMenu = (props: MobileMenuProps) => {
+export const MobileMenu = (props: MobileMenuProps) => {
   const isActive = props.mobileMenuOpen ? "active" : "inactive";
   const { alertCount } = props;
   return <div>

frontend/nav/ticker_list.tsx

@@ -72,7 +72,7 @@ const Ticker = (log: TaggedLog, timeSettings: TimeSettings) => {
 };
 
 /** The logs ticker, with closed/open views, and a link to the Logs page. */
-export let TickerList = (props: TickerListProps) => {
+export const TickerList = (props: TickerListProps) => {
   return <ErrorBoundary>
     <div className="ticker-list" onClick={props.toggle("tickerListOpen")}>
       <div className="first-ticker">

frontend/open_farm/icons.ts

@@ -21,7 +21,7 @@ export interface OFCropResponse {
 }
 
 export namespace OpenFarmAPI {
-  export let OFBaseURL = BASE;
+  export const OFBaseURL = BASE;
 }
 
 export function svgToUrl(xml: string | undefined): string {

frontend/redux/middlewares.ts

@@ -20,7 +20,7 @@ export interface MiddlewareConfig { fn: MW; env: EnvName; }
 
 /** To make it easier to manage all things watching the state tree,
  * we keep subscriber functions in this array. */
-export let mwConfig: MiddlewareConfig[] = [
+export const mwConfig: MiddlewareConfig[] = [
   { env: "*", fn: thunk },
   { env: "development", fn: require("redux-immutable-state-invariant").default() },
   stateFetchMiddlewareConfig,

frontend/redux/root_reducer.ts

@@ -17,7 +17,7 @@ const reducerRecord = {
   resources: resourceReducer,
 };
 
-export let reducers = combineReducers(reducerRecord);
+export const reducers = combineReducers(reducerRecord);
 
 Object.keys(reducerRecord).map((x: keyof typeof reducerRecord) => {
   if (!reducerRecord[x]) {

frontend/redux/store.ts

@@ -6,10 +6,9 @@ import { getMiddleware } from "./middlewares";
 import { set } from "lodash";
 
 function dev(): Store {
-  store = createStore(rootReducer,
+  return createStore(rootReducer,
     maybeFetchOldState(),
     getMiddleware("development"));
-  return store;
 }
 
 function prod(): Store {
@@ -26,7 +25,7 @@ export function configureStore() {
   return store2;
 }
 
-export let store = configureStore();
+export const store = configureStore();
 
 /** Tries to fetch previous state from `sessionStorage`.
  * Returns {} if nothing is found. Used mostly for hot reloading. */

frontend/redux/subscribers.ts

@@ -52,7 +52,7 @@ export interface Subscription { fn: (state: Everything) => void; env: EnvName; }
 
 /** To make it easier to manage all things watching the state tree,
  * we keep subscriber functions in this array. */
-export let subscriptions: Subscription[] = [{ env: "*", fn: unsavedCheck }];
+export const subscriptions: Subscription[] = [{ env: "*", fn: unsavedCheck }];
 
 export function registerSubscribers(store: Store) {
   const ENV_LIST = [process.env.NODE_ENV, "*"];

frontend/refresh_token.ts

@@ -11,7 +11,7 @@ const ok = (x: AxiosResponse<AuthState>) => {
 
 /** Grab a new token from the API (won't extend token's exp. date).
  * Redirect to home page on failure. */
-export let maybeRefreshToken
+export const maybeRefreshToken
   = (old: AuthState): Promise<AuthState | undefined> => {
     API.setBaseUrl(old.token.unencoded.iss);
     setToken(old); // Precaution: The Axios interceptors might not be set yet.

frontend/regimens/reducer.ts

@@ -36,9 +36,9 @@ function newState(): RegimenState {
   };
 }
 
-export let initialState: RegimenState = newState();
+export const initialState: RegimenState = newState();
 
-export let regimensReducer = generateReducer<RegimenState>(initialState)
+export const regimensReducer = generateReducer<RegimenState>(initialState)
   .add<TaggedResource>(Actions.DESTROY_RESOURCE_OK, (s, { payload }) => {
     switch (payload.uuid) {
       case s.selectedSequenceUUID:

frontend/resources/actions.ts

@@ -33,6 +33,6 @@ export const generalizedError = (payload: GeneralizedError) => {
   return { type: Actions._RESOURCE_NO, payload };
 };
 
-export let destroyNO = generalizedError;
-export let createNO = generalizedError;
-export let updateNO = generalizedError;
+export const destroyNO = generalizedError;
+export const createNO = generalizedError;
+export const updateNO = generalizedError;

frontend/resources/selectors.ts

@@ -40,7 +40,7 @@ export * from "./selectors_for_indexing";
  * unless there is actually a reason for the resource to not have a UUID.
  * `findId()` is more appropriate 99% of the time because it can spot
  * referential integrity issues. */
-export let maybeDetermineUuid =
+export const maybeDetermineUuid =
   (index: ResourceIndex, kind: ResourceName, id: number) => {
     const kni = joinKindAndId(kind, id);
     const uuid = index.byKindAndId[kni];
@@ -50,7 +50,7 @@ export let maybeDetermineUuid =
     }
   };
 
-export let findId = (index: ResourceIndex, kind: ResourceName, id: number): UUID => {
+export const findId = (index: ResourceIndex, kind: ResourceName, id: number): UUID => {
   const uuid = maybeDetermineUuid(index, kind, id);
   if (uuid) {
     return uuid;
@@ -59,7 +59,7 @@ export let findId = (index: ResourceIndex, kind: ResourceName, id: number): UUID
   }
 };
 
-export let isKind = (name: ResourceName) => (tr: TaggedResource) => tr.kind === name;
+export const isKind = (name: ResourceName) => (tr: TaggedResource) => tr.kind === name;
 
 export function groupPointsByType(index: ResourceIndex) {
   return chain(selectAllActivePoints(index))
@@ -151,7 +151,7 @@ export function getSequenceByUUID(index: ResourceIndex,
 
 /** GIVEN: a slot UUID.
  *  FINDS: Tool in that slot (if any) */
-export let currentToolInSlot = (index: ResourceIndex) =>
+export const currentToolInSlot = (index: ResourceIndex) =>
   (toolSlotUUID: string): TaggedTool | undefined => {
     const currentSlot = selectCurrentToolSlot(index, toolSlotUUID);
     if (currentSlot

frontend/resources/selectors_by_id.ts

@@ -31,7 +31,7 @@ export const findAllById =
     return output;
   };
 
-export let byId =
+export const byId =
   <T extends TaggedResource>(name: T["kind"]) =>
     (index: ResourceIndex, id: number): T | undefined => {
       const resources = findAll(index, name);
@@ -40,7 +40,7 @@ export let byId =
       return resources.filter(f)[0] as T | undefined;
     };
 
-export let findFarmEventById = (ri: ResourceIndex, fe_id: number) => {
+export const findFarmEventById = (ri: ResourceIndex, fe_id: number) => {
   const fe = byId("FarmEvent")(ri, fe_id);
   if (fe && isTaggedFarmEvent(fe) && sanityCheck(fe)) {
     return fe;
@@ -50,7 +50,7 @@ export let findFarmEventById = (ri: ResourceIndex, fe_id: number) => {
   }
 };
 
-export let maybeFindToolById = (ri: ResourceIndex, tool_id?: number):
+export const maybeFindToolById = (ri: ResourceIndex, tool_id?: number):
   TaggedTool | undefined => {
   const tool = tool_id && byId("Tool")(ri, tool_id);
   if (tool && isTaggedTool(tool) && sanityCheck(tool)) {
@@ -60,7 +60,7 @@ export let maybeFindToolById = (ri: ResourceIndex, tool_id?: number):
   }
 };
 
-export let findToolById = (ri: ResourceIndex, tool_id: number) => {
+export const findToolById = (ri: ResourceIndex, tool_id: number) => {
   const tool = maybeFindToolById(ri, tool_id);
   if (tool) {
     return tool;
@@ -69,7 +69,7 @@ export let findToolById = (ri: ResourceIndex, tool_id: number) => {
   }
 };
 
-export let findSequenceById = (ri: ResourceIndex, sequence_id: number) => {
+export const findSequenceById = (ri: ResourceIndex, sequence_id: number) => {
   const sequence = byId("Sequence")(ri, sequence_id);
   if (sequence && isTaggedSequence(sequence) && sanityCheck(sequence)) {
     return sequence;
@@ -78,9 +78,9 @@ export let findSequenceById = (ri: ResourceIndex, sequence_id: number) => {
   }
 };
 
-export let findSlotById = byId<TaggedToolSlotPointer>("Point");
+export const findSlotById = byId<TaggedToolSlotPointer>("Point");
 /** Find a Tool's corresponding Slot. */
-export let findSlotByToolId = (index: ResourceIndex, tool_id: number) => {
+export const findSlotByToolId = (index: ResourceIndex, tool_id: number) => {
   const tool = findToolById(index, tool_id);
   const query = { body: { tool_id: tool.body.id } };
   const every = Object
@@ -122,7 +122,7 @@ export function maybeFindSavedGardenById(index: ResourceIndex, id: number) {
   if (resource && isTaggedSavedGarden(resource)) { return resource; }
 }
 
-export let findRegimenById = (ri: ResourceIndex, regimen_id: number) => {
+export const findRegimenById = (ri: ResourceIndex, regimen_id: number) => {
   const regimen = byId("Regimen")(ri, regimen_id);
   if (regimen && isTaggedRegimen(regimen) && sanityCheck(regimen)) {
     return regimen;

frontend/resources/selectors_by_kind.ts

@@ -54,13 +54,13 @@ const uuidFinder = <T extends TaggedResource>(r: T["kind"]) =>
     }
   };
 
-export let findTool = uuidFinder<TaggedTool>("Tool");
-export let findSequence = uuidFinder<TaggedSequence>("Sequence");
-export let findRegimen = uuidFinder<TaggedRegimen>("Regimen");
-export let findFarmEvent = uuidFinder<TaggedFarmEvent>("FarmEvent");
-export let findPoints = uuidFinder<TaggedPoint>("Point");
-export let findPointGroup = uuidFinder<TaggedPoint>("Point");
-export let findSavedGarden = uuidFinder<TaggedSavedGarden>("SavedGarden");
+export const findTool = uuidFinder<TaggedTool>("Tool");
+export const findSequence = uuidFinder<TaggedSequence>("Sequence");
+export const findRegimen = uuidFinder<TaggedRegimen>("Regimen");
+export const findFarmEvent = uuidFinder<TaggedFarmEvent>("FarmEvent");
+export const findPoints = uuidFinder<TaggedPoint>("Point");
+export const findPointGroup = uuidFinder<TaggedPoint>("Point");
+export const findSavedGarden = uuidFinder<TaggedSavedGarden>("SavedGarden");
 
 export const selectAllCrops =
   (i: ResourceIndex) => findAll<TaggedCrop>(i, "Crop");

frontend/resources/tagged_resources.ts

@@ -79,29 +79,29 @@ function isTaggedPoint(x: {}): x is PointerType {
   return (is("Point")(x)) && (x.kind === "Point");
 }
 
-export let isTaggedRegimen =
+export const isTaggedRegimen =
   (x: object): x is TaggedRegimen => is("Regimen")(x);
-export let isTaggedFolder =
+export const isTaggedFolder =
   (x: object): x is TaggedRegimen => is("Folder")(x);
-export let isTaggedSequence =
+export const isTaggedSequence =
   (x: object): x is TaggedSequence => is("Sequence")(x);
-export let isTaggedTool =
+export const isTaggedTool =
   (x: object): x is TaggedTool => is("Tool")(x);
-export let isTaggedFarmEvent =
+export const isTaggedFarmEvent =
   (x: object): x is TaggedFarmEvent => is("FarmEvent")(x);
-export let isTaggedToolSlotPointer =
+export const isTaggedToolSlotPointer =
   (x: object): x is TaggedToolSlotPointer => {
     return isTaggedPoint(x) && (x.body.pointer_type === "ToolSlot");
   };
-export let isTaggedPlantPointer =
+export const isTaggedPlantPointer =
   (x: object): x is TaggedPlantPointer => {
     return isTaggedPoint(x) && (x.body.pointer_type === "Plant");
   };
-export let isTaggedGenericPointer =
+export const isTaggedGenericPointer =
   (x: object): x is TaggedGenericPointer => {
     return isTaggedPoint(x) && (x.body.pointer_type === "GenericPointer");
   };
-export let isTaggedSavedGarden =
+export const isTaggedSavedGarden =
   (x: object): x is TaggedSavedGarden => is("SavedGarden")(x);
-export let isTaggedPlantTemplate =
+export const isTaggedPlantTemplate =
   (x: object): x is TaggedPlantTemplate => is("PlantTemplate")(x);

frontend/sequences/reducer.ts

@@ -9,7 +9,7 @@ export const initialState: SequenceReducerState = {
   stepIndex: undefined,
 };
 
-export let sequenceReducer = generateReducer<SequenceReducerState>(initialState)
+export const sequenceReducer = generateReducer<SequenceReducerState>(initialState)
   .add<TaggedResource>(Actions.DESTROY_RESOURCE_OK, (s, { payload }) => {
     switch (payload.uuid) {
       case s.current:

frontend/sequences/step_tiles/tile_if/index.tsx

@@ -118,7 +118,7 @@ export function InnerIf(props: IfParams) {
 /** Creates a function that can be used in the `onChange` event of a _else or
  * _then block in the sequence editor.
  */
-export let IfBlockDropDownHandler = (props: ThenElseParams) => {
+export const IfBlockDropDownHandler = (props: ThenElseParams) => {
 
   const { dispatch, index, thenElseKey } = props;
   const step = props.currentStep;

frontend/ui/expandable_header.tsx

@@ -7,7 +7,7 @@ interface Props {
   expanded: boolean;
 }
 
-export let ExpandableHeader = (props: Props) => {
+export const ExpandableHeader = (props: Props) => {
   const { onClick, title, expanded } = props;
   const icon_string = expanded ? "minus" : "plus";
   const nbwhitespace = title != "";

frontend/util/util.ts

@@ -18,7 +18,7 @@ import {
 } from "lodash";
 import { t } from "../i18next_wrapper";
 
-export let colors: Array<ResourceColor> = [
+export const colors: Array<ResourceColor> = [
   "blue",
   "green",
   "yellow",