moar WIP

doc/impl-thoughts/RECONNECTING.md

@@ -36,9 +36,9 @@ rooms should report how many messages they have queued up, and each time they se
 
 # TODO
 
- - finish (Base)ObservableValue 
+ - DONE: finish (Base)ObservableValue 
     - put in own file
-    - add waitFor
+    - add waitFor (won't this leak if the promise never resolves?)
     - decide whether we want to inherit (no?)
  - cleanup Reconnector with recent changes, move generic code, make imports work
  - add SyncStatus as ObservableValue of enum in Sync

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "cheerio": "^1.0.0-rc.3",
     "finalhandler": "^1.1.1",
-    "impunity": "^0.0.10",
+    "impunity": "^0.0.11",
     "postcss": "^7.0.18",
     "postcss-import": "^12.0.1",
     "rollup": "^1.15.6",

src/main.js

@@ -1,11 +1,13 @@
-import HomeServerApi from "./matrix/hs-api.js";
+import HomeServerApi from "./matrix/net/HomeServerApi.js";
 // import {RecordRequester, ReplayRequester} from "./matrix/net/replay.js";
 import fetchRequest from "./matrix/net/fetch.js";
+import {Reconnector} from "./matrix/net/connection/Reconnector.js";
 import StorageFactory from "./matrix/storage/idb/create.js";
 import SessionsStore from "./matrix/sessions-store/localstorage/SessionsStore.js";
 import BrawlViewModel from "./domain/BrawlViewModel.js";
 import BrawlView from "./ui/web/BrawlView.js";
-import DOMClock from "./utils/DOMClock.js";
+import DOMClock from "./ui/web/dom/Clock.js";
+import OnlineStatus from "./ui/web/dom/OnlineStatus.js";
 
 export default async function main(container) {
     try {
@@ -22,12 +24,6 @@ export default async function main(container) {
         const request = fetchRequest;
         const clock = new DOMClock();
 
-        const sessionContainer = new SessionContainer({
-            clock,
-            request,
-            storageFactory: new StorageFactory(),
-        });
-
         const vm = new BrawlViewModel({
             storageFactory: new StorageFactory(),
             createHsApi: (homeServer, accessToken, reconnector) => new HomeServerApi({homeServer, accessToken, request, reconnector}),

src/matrix/Reconnector.js

@@ -1,169 +0,0 @@
-export class ExponentialRetryDelay {
-    constructor(start = 2000, createTimeout) {
-        this._start = start;
-        this._current = start;
-        this._createTimeout = createTimeout;
-        this._max = 60 * 5 * 1000; //5 min
-        this._timeout = null;
-    }
-
-    async waitForRetry() {
-        this._timeout = this._createTimeout(this._current);
-        try {
-            await this._timeout.elapsed();
-            // only increase delay if we didn't get interrupted
-            const seconds = this._current / 1000;
-            const powerOfTwo = (seconds * seconds) * 1000;
-            this._current = Math.max(this._max, powerOfTwo);
-        } catch(err) {
-            // swallow AbortError, means abort was called
-            if (!(err instanceof AbortError)) {
-                throw err;
-            }
-        } finally {
-            this._timeout = null;
-        }
-    }
-
-    abort() {
-        if (this._timeout) {
-            this._timeout.abort();
-        }
-    }
-
-    reset() {
-        this._current = this._start;
-        this.abort();
-    }
-
-    get nextValue() {
-        return this._current;
-    }
-}
-
-// we need a clock interface that gives us both timestamps and a timer that we can interrupt?
-
-// state
-// - offline
-// - waiting to reconnect
-// - reconnecting
-// - online
-// 
-// 
-
-function createEnum(...values) {
-    const obj = {};
-    for (const value of values) {
-        obj[value] = value;
-    }
-    return Object.freeze(obj);
-}
-
-export const ConnectionState = createEnum(
-    "Offline",
-    "Waiting",
-    "Reconnecting",
-    "Online"
-);
-
-export class Reconnector {
-    constructor({retryDelay, createTimeMeasure, isOnline}) {
-        this._isOnline = isOnline;
-        this._retryDelay = retryDelay;
-        this._createTimeMeasure = createTimeMeasure;
-        // assume online, and do our thing when something fails
-        this._state = new ObservableValue(ConnectionState.Online);
-        this._isReconnecting = false;
-        this._versionsResponse = null;
-    }
-
-    get lastVersionsResponse() {
-        return this._versionsResponse;
-    }
-
-    get connectionState() {
-        return this._state;
-    }
-
-    get retryIn() {
-        if (this._state.get() === ConnectionState.Waiting) {
-            return this._retryDelay.nextValue - this._stateSince.measure();
-        }
-        return 0;
-    }
-
-    async onRequestFailed(hsApi) {
-        if (!this._isReconnecting) {
-            this._setState(ConnectionState.Offline);
-    
-            const isOnlineSubscription = this._isOnline && this._isOnline.subscribe(online => {
-                if (online) {
-                    this.tryNow();
-                }
-            });
-
-            try {
-                await this._reconnectLoop(hsApi);
-            } finally {
-                if (isOnlineSubscription) {
-                    // unsubscribe from this._isOnline
-                    isOnlineSubscription();
-                }
-            }
-        }
-    }
-
-    tryNow() {
-        if (this._retryDelay) {
-            // this will interrupt this._retryDelay.waitForRetry() in _reconnectLoop
-            this._retryDelay.abort();
-        }
-    }
-
-    _setState(state) {
-        if (state !== this._state.get()) {
-            if (state === ConnectionState.Waiting) {
-                this._stateSince = this._createTimeMeasure();
-            } else {
-                this._stateSince = null;
-            }
-            this._state.set(state);
-        }
-    }
-    
-    async _reconnectLoop(hsApi) {
-        this._isReconnecting = true;
-        this._versionsResponse = null;
-        this._retryDelay.reset();
-
-        try {
-            while (!this._versionsResponse) {
-                try {
-                    this._setState(ConnectionState.Reconnecting);
-                    // use 10s timeout, because we don't want to be waiting for
-                    // a stale connection when we just came online again
-                    const versionsRequest = hsApi.versions({timeout: 10000});
-                    this._versionsResponse = await versionsRequest.response();
-                    this._setState(ConnectionState.Online);
-                } catch (err) {
-                    if (err instanceof NetworkError) {
-                        this._setState(ConnectionState.Waiting);
-                        try {
-                            await this._retryDelay.waitForRetry();
-                        } catch (err) {
-                            if (!(err instanceof AbortError)) {
-                                throw err;
-                            }
-                        }
-                    } else {
-                        throw err;
-                    }
-                }
-            }
-        } catch (err) {
-            // nothing is catching the error above us,
-            // so just log here
-            console.err(err);
-        }
-    }
-}

src/matrix/SessionContainer.js

@@ -1,4 +1,4 @@
-import HomeServerApi from "./hs-api.js";
+import HomeServerApi from "./net/HomeServerApi.js";
 
 export const LoadStatus = createEnum(
     "NotLoading",
@@ -131,7 +131,6 @@ export class SessionContainer {
         }
 
         this._sync = new Sync({hsApi, storage, session: this._session});
-
         // notify sync and session when back online
         this._reconnectSubscription = this._reconnector.connectionStatus.subscribe(state => {
             if (state === ConnectionStatus.Online) {
@@ -139,7 +138,15 @@ export class SessionContainer {
                 this._session.start(this._reconnector.lastVersionsResponse);
             }
         });
-        
+        await this._waitForFirstSync();
+        this._status.set(LoadStatus.Ready);
+
+        // if this fails, the reconnector will start polling versions to reconnect
+        const lastVersionsResponse = await hsApi.versions({timeout: 10000}).response();
+        this._session.start(lastVersionsResponse);
+    }
+
+    async _waitForFirstSync() {
         try {
             await this._sync.start();
         } catch (err) {
@@ -151,12 +158,18 @@ export class SessionContainer {
             }
         }
         // only transition into Ready once the first sync has succeeded
-        await this._sync.status.waitFor(s => s === SyncStatus.Syncing);
-        this._status.set(LoadStatus.Ready);
-
-        // if this fails, the reconnector will start polling versions to reconnect
-        const lastVersionsResponse = await hsApi.versions({timeout: 10000}).response();
-        this._session.start(lastVersionsResponse);
+        this._waitForFirstSyncHandle = this._sync.status.waitFor(s => s === SyncStatus.Syncing);
+        try {
+            await this._waitForFirstSyncHandle.promise;
+        } catch (err) {
+            // if dispose is called from stop, bail out
+            if (err instanceof AbortError) {
+                return;
+            }
+            throw err;
+        } finally {
+            this._waitForFirstSyncHandle = null;
+        }
     }
 
 
@@ -183,6 +196,10 @@ export class SessionContainer {
         this._reconnectSubscription = null;
         this._sync.stop();
         this._session.stop();
+        if (this._waitForFirstSyncHandle) {
+            this._waitForFirstSyncHandle.dispose();
+            this._waitForFirstSyncHandle = null;
+        }
     }
 }
 

src/matrix/net/ExponentialRetryDelay.js

@@ -0,0 +1,107 @@
+import {AbortError} from "../../utils/error.js";
+
+export default class ExponentialRetryDelay {
+    constructor(createTimeout, start = 2000) {
+        this._start = start;
+        this._current = start;
+        this._createTimeout = createTimeout;
+        this._max = 60 * 5 * 1000; //5 min
+        this._timeout = null;
+    }
+
+    async waitForRetry() {
+        this._timeout = this._createTimeout(this._current);
+        try {
+            await this._timeout.elapsed();
+            // only increase delay if we didn't get interrupted
+            const next = 2 * this._current;
+            this._current = Math.min(this._max, next);
+        } catch(err) {
+            // swallow AbortError, means abort was called
+            if (!(err instanceof AbortError)) {
+                throw err;
+            }
+        } finally {
+            this._timeout = null;
+        }
+    }
+
+    abort() {
+        if (this._timeout) {
+            this._timeout.abort();
+        }
+    }
+
+    reset() {
+        this._current = this._start;
+        this.abort();
+    }
+
+    get nextValue() {
+        return this._current;
+    }
+}
+
+
+import MockClock from "../../../mocks/Clock.js";
+
+export function tests() {
+    return {
+        "test sequence": async assert => {
+            const clock = new MockClock();
+            const retryDelay = new ExponentialRetryDelay(clock.createTimeout, 2000);
+            let promise;
+
+            assert.strictEqual(retryDelay.nextValue, 2000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(2000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 4000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(4000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 8000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(8000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 16000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(16000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 32000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(32000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 64000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(64000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 128000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(128000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 256000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(256000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 300000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(300000);
+            await promise;
+
+            assert.strictEqual(retryDelay.nextValue, 300000);
+            promise = retryDelay.waitForRetry();
+            clock.elapse(300000);
+            await promise;
+        },
+    }
+    
+}

src/matrix/net/Reconnector.js

@@ -0,0 +1,176 @@
+import createEnum from "../../utils/enum.js";
+import {AbortError} from "../../utils/error.js";
+import {NetworkError} from "../error.js"
+import ObservableValue from "../../observable/ObservableValue.js";
+
+export const ConnectionStatus = createEnum(
+    "Offline",
+    "Waiting",
+    "Reconnecting",
+    "Online"
+);
+
+export class Reconnector {
+    constructor({retryDelay, createMeasure, onlineStatus}) {
+        this._onlineStatus = onlineStatus;
+        this._retryDelay = retryDelay;
+        this._createTimeMeasure = createMeasure;
+        // assume online, and do our thing when something fails
+        this._state = new ObservableValue(ConnectionStatus.Online);
+        this._isReconnecting = false;
+        this._versionsResponse = null;
+    }
+
+    get lastVersionsResponse() {
+        return this._versionsResponse;
+    }
+
+    get connectionStatus() {
+        return this._state;
+    }
+
+    get retryIn() {
+        if (this._state.get() === ConnectionStatus.Waiting) {
+            return this._retryDelay.nextValue - this._stateSince.measure();
+        }
+        return 0;
+    }
+
+    async onRequestFailed(hsApi) {
+        if (!this._isReconnecting) {
+            this._setState(ConnectionStatus.Offline);
+    
+            const onlineStatusSubscription = this._onlineStatus && this._onlineStatus.subscribe(online => {
+                if (online) {
+                    this.tryNow();
+                }
+            });
+
+            try {
+                await this._reconnectLoop(hsApi);
+            } catch (err) {
+                // nothing is catching the error above us,
+                // so just log here
+                console.error(err);
+            } finally {
+                if (onlineStatusSubscription) {
+                    // unsubscribe from this._onlineStatus
+                    onlineStatusSubscription();
+                }
+            }
+        }
+    }
+
+    tryNow() {
+        if (this._retryDelay) {
+            // this will interrupt this._retryDelay.waitForRetry() in _reconnectLoop
+            this._retryDelay.abort();
+        }
+    }
+
+    _setState(state) {
+        if (state !== this._state.get()) {
+            if (state === ConnectionStatus.Waiting) {
+                this._stateSince = this._createTimeMeasure();
+            } else {
+                this._stateSince = null;
+            }
+            this._state.set(state);
+        }
+    }
+    
+    async _reconnectLoop(hsApi) {
+        this._isReconnecting = true;
+        this._versionsResponse = null;
+        this._retryDelay.reset();
+
+        while (!this._versionsResponse) {
+            try {
+                this._setState(ConnectionStatus.Reconnecting);
+                // use 10s timeout, because we don't want to be waiting for
+                // a stale connection when we just came online again
+                const versionsRequest = hsApi.versions({timeout: 10000});
+                this._versionsResponse = await versionsRequest.response();
+                this._setState(ConnectionStatus.Online);
+            } catch (err) {
+                if (err instanceof NetworkError) {
+                    this._setState(ConnectionStatus.Waiting);
+                    try {
+                        await this._retryDelay.waitForRetry();
+                    } catch (err) {
+                        if (!(err instanceof AbortError)) {
+                            throw err;
+                        }
+                    }
+                } else {
+                    throw err;
+                }
+            }
+        }
+    }
+}
+
+
+import MockClock from "../../../mocks/Clock.js";
+import ExponentialRetryDelay from "./ExponentialRetryDelay.js";
+
+export function tests() {
+    function createHsApiMock(remainingFailures) {
+        return {
+            versions() {
+                return {
+                    response() {
+                        if (remainingFailures) {
+                            remainingFailures -= 1;
+                            return Promise.reject(new NetworkError());
+                        } else {
+                            return Promise.resolve(42);
+                        }
+                    }
+                };
+            }
+        }
+    }
+
+    return {
+        "test reconnecting with 1 failure": async assert => {
+            const clock = new MockClock();
+            const {createMeasure} = clock;
+            const onlineStatus = new ObservableValue(false);
+            const retryDelay = new ExponentialRetryDelay(clock.createTimeout, 2000);
+            const reconnector = new Reconnector({retryDelay, onlineStatus, createMeasure});
+            const {connectionStatus} = reconnector;
+            const statuses = [];
+            const subscription = reconnector.connectionStatus.subscribe(s => {
+                statuses.push(s);
+            });
+            reconnector.onRequestFailed(createHsApiMock(1));
+            await connectionStatus.waitFor(s => s === ConnectionStatus.Waiting).promise;
+            clock.elapse(2000);
+            await connectionStatus.waitFor(s => s === ConnectionStatus.Online).promise;
+            assert.deepEqual(statuses, [
+                ConnectionStatus.Offline,
+                ConnectionStatus.Reconnecting,
+                ConnectionStatus.Waiting,
+                ConnectionStatus.Reconnecting,
+                ConnectionStatus.Online
+            ]);
+            assert.strictEqual(reconnector.lastVersionsResponse, 42);
+            subscription();
+        },
+        "test reconnecting with onlineStatus": async assert => {
+            const clock = new MockClock();
+            const {createMeasure} = clock;
+            const onlineStatus = new ObservableValue(false);
+            const retryDelay = new ExponentialRetryDelay(clock.createTimeout, 2000);
+            const reconnector = new Reconnector({retryDelay, onlineStatus, createMeasure});
+            const {connectionStatus} = reconnector;
+            reconnector.onRequestFailed(createHsApiMock(1));
+            await connectionStatus.waitFor(s => s === ConnectionStatus.Waiting).promise;
+            onlineStatus.set(true); //skip waiting
+            await connectionStatus.waitFor(s => s === ConnectionStatus.Online).promise;
+            assert.equal(connectionStatus.get(), ConnectionStatus.Online);
+            assert.strictEqual(reconnector.lastVersionsResponse, 42);
+        },
+    }
+}

src/mocks/Clock.js

@@ -0,0 +1,77 @@
+import ObservableValue from "../observable/ObservableValue.js";
+
+class Timeout {
+    constructor(elapsed, ms) {
+        this._reject = null;
+        this._handle = null;
+        const timeoutValue = elapsed.get() + ms;
+        this._waitHandle = elapsed.waitFor(t => t >= timeoutValue);
+    }
+
+    elapsed() {
+        return this._waitHandle.promise;
+    }
+
+    abort() {
+        // will reject with AbortError
+        this._waitHandle.dispose();
+    }
+}
+
+class TimeMeasure {
+    constructor(elapsed) {
+        this._elapsed = elapsed;
+        this._start = elapsed.get();
+    }
+
+    measure() {
+        return this._elapsed.get() - this._start;
+    }
+}
+
+export default class Clock {
+    constructor(baseTimestamp = 0) {
+        this._baseTimestamp = baseTimestamp;
+        this._elapsed = new ObservableValue(0);
+        // should be callable as a function as well as a method
+        this.createMeasure = this.createMeasure.bind(this);
+        this.createTimeout = this.createTimeout.bind(this);
+        this.now = this.now.bind(this);
+    }
+
+    createMeasure() {
+        return new TimeMeasure(this._elapsed);
+    }
+
+    createTimeout(ms) {
+        return new Timeout(this._elapsed, ms);
+    }
+
+    now() {
+        return this._baseTimestamp + this.elapsed;
+    }
+
+    elapse(ms) {
+        this._elapsed.set(this._elapsed.get() + Math.max(0, ms));
+    }
+
+    get elapsed() {
+        return this._elapsed.get();
+    }
+}
+
+export function tests() {
+    return {
+        "test timeout": async assert => {
+            const clock = new Clock();
+            Promise.resolve().then(() => {
+                clock.elapse(500);
+                clock.elapse(500);
+            }).catch(assert.fail);
+            const timeout = clock.createTimeout(1000);
+            const promise = timeout.elapsed();
+            assert(promise instanceof Promise);
+            await promise;
+        }
+    }
+}

src/observable/BaseObservable.js

@@ -1,4 +1,4 @@
-export default class BaseObservableCollection {
+export default class BaseObservable {
     constructor() {
         this._handlers = new Set();
     }
@@ -31,33 +31,8 @@ export default class BaseObservableCollection {
     // Add iterator over handlers here
 }
 
-// like an EventEmitter, but doesn't have an event type
-export class BaseObservableValue extends BaseObservableCollection {
-    emit(argument) {
-        for (const h of this._handlers) {
-            h(argument);
-        }
-    }
-}
-
-export class ObservableValue extends BaseObservableValue {
-    constructor(initialValue) {
-        super();
-        this._value = initialValue;
-    }
-
-    get() {
-        return this._value;
-    }
-
-    set(value) {
-        this._value = value;
-        this.emit(this._value);
-    }
-}
-
 export function tests() {
-    class Collection extends BaseObservableCollection {
+    class Collection extends BaseObservable {
         constructor() {
             super();
             this.firstSubscribeCalls = 0;

src/observable/ObservableValue.js

@@ -0,0 +1,120 @@
+import {AbortError} from "../utils/error.js";
+import BaseObservable from "./BaseObservable.js";
+
+// like an EventEmitter, but doesn't have an event type
+export class BaseObservableValue extends BaseObservable {
+    emit(argument) {
+        for (const h of this._handlers) {
+            h(argument);
+        }
+    }
+
+}
+
+class WaitForHandle {
+    constructor(observable, predicate) {
+        this._promise = new Promise((resolve, reject) => {
+            this._reject = reject;
+            this._subscription = observable.subscribe(v => {
+                if (predicate(v)) {
+                    this._reject = null;
+                    resolve(v);
+                    this.dispose();
+                }
+            });
+        });
+    }
+
+    get promise() {
+        return this._promise;
+    }
+
+    dispose() {
+        if (this._subscription) {
+            this._subscription();
+            this._subscription = null;
+        }
+        if (this._reject) {
+            this._reject(new AbortError());
+            this._reject = null;
+        }
+    }
+}
+
+class ResolvedWaitForHandle {
+    constructor(promise) {
+        this.promise = promise;
+    }
+
+    dispose() {}
+}
+
+export default class ObservableValue extends BaseObservableValue {
+    constructor(initialValue) {
+        super();
+        this._value = initialValue;
+    }
+
+    get() {
+        return this._value;
+    }
+
+    set(value) {
+        if (value !== this._value) {
+            this._value = value;
+            this.emit(this._value);
+        }
+    }
+
+    waitFor(predicate) {
+        if (predicate(this.get())) {
+            return new ResolvedWaitForHandle(Promise.resolve(this.get()));
+        } else {
+            return new WaitForHandle(this, predicate);
+        }
+    }
+}
+
+export function tests() {
+    return {
+        "set emits an update": assert => {
+            const a = new ObservableValue();
+            let fired = false;
+            const subscription = a.subscribe(v => {
+                fired = true;
+                assert.strictEqual(v, 5);
+            });
+            a.set(5);
+            assert(fired);
+            subscription();
+        },
+        "set doesn't emit if value hasn't changed": assert => {
+            const a = new ObservableValue(5);
+            let fired = false;
+            const subscription = a.subscribe(() => {
+                fired = true;
+            });
+            a.set(5);
+            a.set(5);
+            assert(!fired);
+            subscription();
+        },
+        "waitFor promise resolves on matching update": async assert => {
+            const a = new ObservableValue(5);
+            const handle = a.waitFor(v => v === 6);
+            Promise.resolve().then(() => {
+                a.set(6);
+            });
+            await handle.promise;
+            assert.strictEqual(a.get(), 6);
+        },
+        "waitFor promise rejects when disposed": async assert => {
+            const a = new ObservableValue();
+            const handle = a.waitFor(() => false);
+            Promise.resolve().then(() => {
+                handle.dispose();
+            });
+            await assert.rejects(handle.promise, AbortError);
+        },
+    }
+}

src/observable/list/BaseObservableList.js

@@ -1,6 +1,6 @@
-import BaseObservableCollection from "../BaseObservableCollection.js";
+import BaseObservable from "../BaseObservable.js";
 
-export default class BaseObservableList extends BaseObservableCollection {
+export default class BaseObservableList extends BaseObservable {
     emitReset() {
         for(let h of this._handlers) {
             h.onReset(this);

src/observable/map/BaseObservableMap.js

@@ -1,6 +1,6 @@
-import BaseObservableCollection from "../BaseObservableCollection.js";
+import BaseObservable from "../BaseObservable.js";
 
-export default class BaseObservableMap extends BaseObservableCollection {
+export default class BaseObservableMap extends BaseObservable {
     emitReset() {
         for(let h of this._handlers) {
             h.onReset();

src/ui/web/dom/Clock.js

@@ -1,4 +1,4 @@
-import {AbortError} from "../utils/error.js";
+import {AbortError} from "../../../utils/error.js";
 
 class Timeout {
     constructor(ms) {
@@ -37,7 +37,7 @@ class TimeMeasure {
     }
 }
 
-export class Clock {
+export default class Clock {
     createMeasure() {
         return new TimeMeasure();
     }

src/ui/web/dom/OnlineStatus.js

@@ -1,4 +1,6 @@
-export class OnlineStatus extends ObservableValue {
+import {BaseObservableValue} from "../../../observable/ObservableValue.js";
+
+export default class OnlineStatus extends BaseObservableValue {
     constructor() {
         super();
         this._onOffline = this._onOffline.bind(this);

src/ui/web/general/SwitchView.js

@@ -34,7 +34,7 @@ export default class SwitchView {
         return this._childView;
     }
 }
-
+/*
 // SessionLoadView
 // should this be the new switch view?
 // and the other one be the BasicSwitchView?
@@ -50,8 +50,8 @@ new BoundSwitchView(vm, vm => vm.isLoading, (loading, vm) => {
         return new SessionView(vm.sessionViewModel);
     }
 });
-
-class BoundSwitchView extends SwitchView {
+*/
+export class BoundSwitchView extends SwitchView {
     constructor(value, mapper, viewCreator) {
         super(viewCreator(mapper(value), value));
         this._mapper = mapper;

src/utils/enum.js

@@ -0,0 +1,7 @@
+export default function createEnum(...values) {
+    const obj = {};
+    for (const value of values) {
+        obj[value] = value;
+    }
+    return Object.freeze(obj);
+}

yarn.lock

@@ -234,10 +234,10 @@ http-errors@~1.7.2:
     statuses ">= 1.5.0 < 2"
     toidentifier "1.0.0"
 
-impunity@^0.0.10:
-  version "0.0.10"
-  resolved "https://registry.yarnpkg.com/impunity/-/impunity-0.0.10.tgz#b4e47c85db53279ca7fcf2e07f7ffb111b050e49"
-  integrity sha512-orL7IaDV//74U6GDyw7j7wcLwxhhLpXStyZ+Pz4O1UEYx1zlCojfpBNuq26Mzbaw0HMEwrMMi4JnLQ9lz3HVFg==
+impunity@^0.0.11:
+  version "0.0.11"
+  resolved "https://registry.yarnpkg.com/impunity/-/impunity-0.0.11.tgz#216da6860ad17dd360fdaa2b15d7006579b5dd8a"
+  integrity sha512-EZUlc/Qx7oaRXZY+PtewrPby63sWZQsEtjGFB05XfbL/20SBkR8ksFnBahkeOD2/ErNkO3vh8AV0oDbdSSS8jQ==
   dependencies:
     colors "^1.3.3"
     commander "^2.19.0"