Add eqeqeq rule but require == for null

.eslintrc.js

@@ -19,6 +19,10 @@ const rules = {
   'brace-style': ['error', '1tbs', { allowSingleLine: false }],
   curly: ['error', 'all'],
 
+  // Always use === and !== except when directly comparing to null
+  // (which only will equal null or undefined)
+  eqeqeq: ['error', 'always', { null: 'never' }],
+
   // prevents us from accidentally checking in exclusive tests (`.only`):
   'mocha/no-exclusive-tests': 'error',
 

ts/SignalProtocolStore.ts

@@ -931,7 +931,7 @@ export class SignalProtocolStore extends EventsMixin {
         throw new Error('loadSession: this.sessions not yet cached!');
       }
 
-      if (qualifiedAddress === null || qualifiedAddress === undefined) {
+      if (qualifiedAddress == null) {
         throw new Error('loadSession: qualifiedAddress was undefined/null');
       }
 
@@ -1049,7 +1049,7 @@ export class SignalProtocolStore extends EventsMixin {
         throw new Error('storeSession: this.sessions not yet cached!');
       }
 
-      if (qualifiedAddress === null || qualifiedAddress === undefined) {
+      if (qualifiedAddress == null) {
         throw new Error('storeSession: qualifiedAddress was undefined/null');
       }
       const { uuid, deviceId } = qualifiedAddress;
@@ -1225,7 +1225,7 @@ export class SignalProtocolStore extends EventsMixin {
         throw new Error('removeAllSessions: this.sessions not yet cached!');
       }
 
-      if (identifier === null || identifier === undefined) {
+      if (identifier == null) {
         throw new Error('removeAllSessions: identifier was undefined/null');
       }
 
@@ -1491,7 +1491,7 @@ export class SignalProtocolStore extends EventsMixin {
       throw new Error('isTrustedIdentity: this.identityKeys not yet cached!');
     }
 
-    if (encodedAddress === null || encodedAddress === undefined) {
+    if (encodedAddress == null) {
       throw new Error('isTrustedIdentity: encodedAddress was undefined/null');
     }
     const ourUuid = window.textsecure.storage.user.getCheckedUuid();
@@ -1553,7 +1553,7 @@ export class SignalProtocolStore extends EventsMixin {
   }
 
   async loadIdentityKey(uuid: UUID): Promise<Uint8Array | undefined> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('loadIdentityKey: uuid was undefined/null');
     }
     const identityRecord = await this.getOrMigrateIdentityRecord(uuid);
@@ -1566,7 +1566,7 @@ export class SignalProtocolStore extends EventsMixin {
   }
 
   async getFingerprint(uuid: UUID): Promise<string | undefined> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('loadIdentityKey: uuid was undefined/null');
     }
 
@@ -1606,7 +1606,7 @@ export class SignalProtocolStore extends EventsMixin {
       throw new Error('saveIdentity: this.identityKeys not yet cached!');
     }
 
-    if (encodedAddress === null || encodedAddress === undefined) {
+    if (encodedAddress == null) {
       throw new Error('saveIdentity: encodedAddress was undefined/null');
     }
     if (!(publicKey instanceof Uint8Array)) {
@@ -1703,7 +1703,7 @@ export class SignalProtocolStore extends EventsMixin {
     uuid: UUID,
     attributes: Partial<IdentityKeyType>
   ): Promise<void> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('saveIdentityWithAttributes: uuid was undefined/null');
     }
 
@@ -1728,7 +1728,7 @@ export class SignalProtocolStore extends EventsMixin {
   }
 
   async setApproval(uuid: UUID, nonblockingApproval: boolean): Promise<void> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('setApproval: uuid was undefined/null');
     }
     if (typeof nonblockingApproval !== 'boolean') {
@@ -1750,7 +1750,7 @@ export class SignalProtocolStore extends EventsMixin {
     verifiedStatus: number,
     publicKey?: Uint8Array
   ): Promise<void> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('setVerified: uuid was undefined/null');
     }
     if (!validateVerifiedStatus(verifiedStatus)) {
@@ -1775,7 +1775,7 @@ export class SignalProtocolStore extends EventsMixin {
   }
 
   async getVerified(uuid: UUID): Promise<number> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('getVerified: uuid was undefined/null');
     }
 
@@ -1799,7 +1799,7 @@ export class SignalProtocolStore extends EventsMixin {
     verifiedStatus: number,
     publicKey?: Uint8Array
   ): Promise<boolean> {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('processVerifiedMessage: uuid was undefined/null');
     }
     if (!validateVerifiedStatus(verifiedStatus)) {
@@ -1849,7 +1849,7 @@ export class SignalProtocolStore extends EventsMixin {
   }
 
   isUntrusted(uuid: UUID, timestampThreshold = TIMESTAMP_THRESHOLD): boolean {
-    if (uuid === null || uuid === undefined) {
+    if (uuid == null) {
       throw new Error('isUntrusted: uuid was undefined/null');
     }
 

ts/background.ts

@@ -3561,7 +3561,7 @@ export async function startApp(): Promise<void> {
 
     const { storageServiceKey } = ev;
 
-    if (storageServiceKey === null) {
+    if (storageServiceKey == null) {
       log.info('onKeysSync: deleting window.storageKey');
       window.storage.remove('storageKey');
     }

ts/components/CompositionInput.tsx

@@ -185,7 +185,7 @@ export function CompositionInput(props: Props): React.ReactElement {
     const range = quill.getSelection();
 
     const insertionRange = range || lastSelectionRange;
-    if (insertionRange === null) {
+    if (insertionRange == null) {
       return;
     }
 
@@ -599,7 +599,7 @@ export function CompositionInput(props: Props): React.ReactElement {
               quill.once('editor-change', () => {
                 const scroller = scrollerRef.current;
 
-                if (scroller !== null) {
+                if (scroller != null) {
                   quill.scrollingContainer = scroller;
                 }
 
@@ -613,7 +613,7 @@ export function CompositionInput(props: Props): React.ReactElement {
                 'selection-change',
                 (newRange: RangeStatic, oldRange: RangeStatic) => {
                   // If we lose focus, store the last edit point for emoji insertion
-                  if (newRange === null) {
+                  if (newRange == null) {
                     setLastSelectionRange(oldRange);
                   }
                 }

ts/components/conversation/MessageAudio.tsx

@@ -226,7 +226,7 @@ export const MessageAudio: React.FC<Props> = (props: Props) => {
     setActiveAudioID,
   } = props;
 
-  assert(audio !== null, 'GlobalAudioContext always provides audio');
+  assert(audio != null, 'GlobalAudioContext always provides audio');
 
   const isActive =
     activeAudioID === id && activeAudioContext === renderingContext;

ts/jobs/helpers/syncHelpers.ts

@@ -56,7 +56,7 @@ function parseOptionalString(name: string, value: unknown): undefined | string {
   if (typeof value === 'string') {
     return value;
   }
-  if (value === undefined || value === null) {
+  if (value == null) {
     return undefined;
   }
   throw new Error(`${name} was not a string`);

ts/models/messages.ts

@@ -1895,11 +1895,11 @@ export class MessageModel extends window.Backbone.Model<MessageAttributesType> {
       attachments: quote.attachments.slice(),
       bodyRanges: quote.bodyRanges.map(({ start, length, mentionUuid }) => {
         strictAssert(
-          start !== undefined && start !== null,
+          start != null,
           'Received quote with a bodyRange.start == null'
         );
         strictAssert(
-          length !== undefined && length !== null,
+          length != null,
           'Received quote with a bodyRange.length == null'
         );
 
@@ -2564,7 +2564,7 @@ export class MessageModel extends window.Backbone.Model<MessageAttributesType> {
                 }
 
                 let avatar = null;
-                if (downloadedAvatar && avatarAttachment !== null) {
+                if (downloadedAvatar && avatarAttachment != null) {
                   const onDiskAttachment =
                     await Attachment.migrateDataToFileSystem(downloadedAvatar, {
                       writeNewAttachmentData:

ts/quill/emoji/completion.tsx

@@ -202,7 +202,7 @@ export class EmojiCompletion {
   completeEmoji(): void {
     const range = this.quill.getSelection();
 
-    if (range === null) {
+    if (range == null) {
       return;
     }
 
@@ -211,7 +211,7 @@ export class EmojiCompletion {
 
     const tokenTextMatch = /:([-+0-9a-z_]*)(:?)$/.exec(leafText);
 
-    if (tokenTextMatch === null) {
+    if (tokenTextMatch == null) {
       return;
     }
 
@@ -277,7 +277,7 @@ export class EmojiCompletion {
       getBoundingClientRect() {
         const selection = window.getSelection();
         // there's a selection and at least one range
-        if (selection !== null && selection.rangeCount !== 0) {
+        if (selection != null && selection.rangeCount !== 0) {
           // grab the first range, the one the user is actually on right now
           // clone it so we don't actually modify the user's selection/caret position
           const range = selection.getRangeAt(0).cloneRange();

ts/quill/mentions/completion.tsx

@@ -151,7 +151,7 @@ export class MentionCompletion {
 
     const range = this.quill.getSelection();
 
-    if (range === null) {
+    if (range == null) {
       return;
     }
 

ts/quill/signal-clipboard/index.ts

@@ -9,7 +9,7 @@ import { getTextFromOps } from '../util';
 const getSelectionHTML = () => {
   const selection = window.getSelection();
 
-  if (selection === null) {
+  if (selection == null) {
     return '';
   }
 
@@ -49,19 +49,19 @@ export class SignalClipboard {
   onCaptureCopy(event: ClipboardEvent, isCut = false): void {
     event.preventDefault();
 
-    if (event.clipboardData === null) {
+    if (event.clipboardData == null) {
       return;
     }
 
     const range = this.quill.getSelection();
 
-    if (range === null) {
+    if (range == null) {
       return;
     }
 
     const contents = this.quill.getContents(range.index, range.length);
 
-    if (contents === null) {
+    if (contents == null) {
       return;
     }
 
@@ -83,7 +83,7 @@ export class SignalClipboard {
   }
 
   onCapturePaste(event: ClipboardEvent): void {
-    if (event.clipboardData === null) {
+    if (event.clipboardData == null) {
       return;
     }
 
@@ -92,7 +92,7 @@ export class SignalClipboard {
     const clipboard = this.quill.getModule('clipboard');
     const selection = this.quill.getSelection();
 
-    if (selection === null) {
+    if (selection == null) {
       return;
     }
 

ts/scripts/symbolicate-crash-reports.ts

@@ -89,7 +89,7 @@ async function main(
   await wrapEventEmitterOnce(proxyServer, 'listening');
   const addr = proxyServer.address();
   strictAssert(
-    typeof addr === 'object' && addr !== null,
+    typeof addr === 'object' && addr != null,
     'Address has to be an object'
   );
 

ts/services/storage.ts

@@ -1640,10 +1640,7 @@ async function sync(
       return undefined;
     }
 
-    strictAssert(
-      manifest.version !== undefined && manifest.version !== null,
-      'Manifest without version'
-    );
+    strictAssert(manifest.version != null, 'Manifest without version');
     const version = manifest.version?.toNumber() ?? 0;
 
     log.info(

ts/services/storageRecordOps.ts

@@ -540,6 +540,7 @@ function doRecordsConflict(
     // false, empty string, or 0 for these records we do not count them as
     // conflicting.
     if (
+      // eslint-disable-next-line eqeqeq
       remoteValue === null &&
       (localValue === false ||
         localValue === '' ||

ts/sql/cleanDataForIpc.ts

@@ -65,6 +65,7 @@ function cleanDataInner(
       //   functions but don't mark them as cleaned.
       return undefined;
     case 'object': {
+      // eslint-disable-next-line eqeqeq
       if (data === null) {
         return null;
       }
@@ -73,7 +74,7 @@ function cleanDataInner(
         const result: CleanedArray = [];
         data.forEach((item, index) => {
           const indexPath = `${path}.${index}`;
-          if (item === undefined || item === null) {
+          if (item == null) {
             pathsChanged.push(indexPath);
           } else {
             result.push(cleanDataInner(item, indexPath, pathsChanged));

ts/test-both/util/getStreamWithTimeout_test.ts

@@ -18,7 +18,7 @@ describe('getStreamWithTimeout', () => {
     stream: Readable,
     chunk: string | null
   ): Promise<unknown> => {
-    const promise = once(stream, chunk === null ? 'end' : 'data');
+    const promise = once(stream, chunk == null ? 'end' : 'data');
     stream.push(chunk);
     return promise;
   };

ts/test-electron/linkPreviews/linkPreviewFetch_test.ts

@@ -76,7 +76,7 @@ describe('link preview fetching', () => {
       const headersObj = new Headers();
       Object.entries({
         'Content-Type': 'text/html; charset=utf-8',
-        'Content-Length': bodyLength === null ? null : String(bodyLength),
+        'Content-Length': bodyLength == null ? null : String(bodyLength),
         ...headers,
       }).forEach(([headerName, headerValue]) => {
         if (headerValue) {

ts/textsecure/EventTarget.ts

@@ -20,7 +20,7 @@ export default class EventTarget {
     if (!(ev instanceof Event)) {
       throw new Error('Expects an event');
     }
-    if (this.listeners === null || typeof this.listeners !== 'object') {
+    if (this.listeners == null || typeof this.listeners !== 'object') {
       this.listeners = {};
     }
     const listeners = this.listeners[ev.type];
@@ -44,7 +44,7 @@ export default class EventTarget {
     if (typeof callback !== 'function') {
       throw new Error('Second argument expects a function');
     }
-    if (this.listeners === null || typeof this.listeners !== 'object') {
+    if (this.listeners == null || typeof this.listeners !== 'object') {
       this.listeners = {};
     }
     let listeners = this.listeners[eventName];
@@ -62,7 +62,7 @@ export default class EventTarget {
     if (typeof callback !== 'function') {
       throw new Error('Second argument expects a function');
     }
-    if (this.listeners === null || typeof this.listeners !== 'object') {
+    if (this.listeners == null || typeof this.listeners !== 'object') {
       this.listeners = {};
     }
     const listeners = this.listeners[eventName];

ts/textsecure/Helpers.ts

@@ -56,7 +56,7 @@ function ensureStringed(thing: any): any {
 
     return res;
   }
-  if (thing === null) {
+  if (thing == null) {
     return null;
   }
   throw new Error(`unsure of how to jsonify object of type ${typeof thing}`);

ts/textsecure/MessageReceiver.ts

@@ -755,7 +755,7 @@ export default class MessageReceiver
         id: item.id,
         receivedAtCounter: item.receivedAtCounter ?? item.timestamp,
         receivedAtDate:
-          item.receivedAtCounter === null ? Date.now() : item.timestamp,
+          item.receivedAtCounter == null ? Date.now() : item.timestamp,
         messageAgeSec: item.messageAgeSec || 0,
 
         // Proto.Envelope fields

ts/textsecure/SendMessage.ts

@@ -293,7 +293,7 @@ class Message {
       throw new Error('Invalid timestamp');
     }
 
-    if (this.expireTimer !== undefined && this.expireTimer !== null) {
+    if (this.expireTimer != null) {
       if (typeof this.expireTimer !== 'number' || !(this.expireTimer >= 0)) {
         throw new Error('Invalid expireTimer');
       }
@@ -311,8 +311,8 @@ class Message {
     }
     if (this.isEndSession()) {
       if (
-        this.body !== null ||
-        this.group !== null ||
+        this.body != null ||
+        this.group != null ||
         this.attachments.length !== 0
       ) {
         throw new Error('Invalid end session message');
@@ -674,7 +674,7 @@ export default class MessageSender {
     >
   ): Promise<Proto.IAttachmentPointer> {
     assert(
-      typeof attachment === 'object' && attachment !== null,
+      typeof attachment === 'object' && attachment != null,
       'Got null attachment in `makeAttachmentPointer`'
     );
 

ts/textsecure/processDataMessage.ts

@@ -76,10 +76,7 @@ function processGroupContext(
   }
 
   strictAssert(group.id, 'group context without id');
-  strictAssert(
-    group.type !== undefined && group.type !== null,
-    'group context without type'
-  );
+  strictAssert(group.type != null, 'group context without type');
 
   const masterKey = deriveMasterKeyFromGroupV1(group.id);
   const data = deriveGroupFields(masterKey);

ts/types/Address.ts

@@ -19,7 +19,7 @@ export class Address {
 
   public static parse(value: string): Address {
     const match = value.match(ADDRESS_REGEXP);
-    strictAssert(match !== null, `Invalid Address: ${value}`);
+    strictAssert(match != null, `Invalid Address: ${value}`);
     const [whole, uuid, deviceId] = match;
     strictAssert(whole === value, 'Integrity check');
     return Address.create(uuid, parseInt(deviceId, 10));

ts/types/QualifiedAddress.ts

@@ -39,7 +39,7 @@ export class QualifiedAddress {
 
   public static parse(value: string): QualifiedAddress {
     const match = value.match(QUALIFIED_ADDRESS_REGEXP);
-    strictAssert(match !== null, `Invalid QualifiedAddress: ${value}`);
+    strictAssert(match != null, `Invalid QualifiedAddress: ${value}`);
     const [whole, ourUuid, uuid, deviceId] = match;
     strictAssert(whole === value, 'Integrity check');
 

ts/types/Stickers.ts

@@ -319,7 +319,7 @@ async function downloadSticker(
   { ephemeral }: { ephemeral?: boolean } = {}
 ): Promise<Omit<StickerFromDBType, 'isCoverOnly'>> {
   const { id, emoji } = proto;
-  strictAssert(id !== undefined && id !== null, "Sticker id can't be null");
+  strictAssert(id != null, "Sticker id can't be null");
 
   const { messaging } = window.textsecure;
   if (!messaging) {

ts/util/dropNull.ts

@@ -8,6 +8,7 @@ export type NullToUndefined<T> = Extract<T, null> extends never
 export function dropNull<T>(
   value: NonNullable<T> | null | undefined
 ): T | undefined {
+  // eslint-disable-next-line eqeqeq
   if (value === null) {
     return undefined;
   }
@@ -22,7 +23,7 @@ export function shallowDropNull<O extends { [key: string]: any }>(
       [Property in keyof O]: NullToUndefined<O[Property]>;
     }
   | undefined {
-  if (value === null || value === undefined) {
+  if (value == null) {
     return undefined;
   }
 

ts/util/isNotNil.ts

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 export function isNotNil<T>(value: T | null | undefined): value is T {
-  if (value === null || value === undefined) {
+  if (value == null) {
     return false;
   }
   return true;

ts/util/isRecord.ts

@@ -2,4 +2,4 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 export const isRecord = (value: unknown): value is Record<string, unknown> =>
-  typeof value === 'object' && !Array.isArray(value) && value !== null;
+  typeof value === 'object' && !Array.isArray(value) && value != null;

ts/util/iterables.ts

@@ -7,7 +7,7 @@ import { getOwn } from './getOwn';
 
 export function isIterable(value: unknown): value is Iterable<unknown> {
   return (
-    (typeof value === 'object' && value !== null && Symbol.iterator in value) ||
+    (typeof value === 'object' && value != null && Symbol.iterator in value) ||
     typeof value === 'string'
   );
 }

ts/util/memoizeByRoot.ts

@@ -27,7 +27,7 @@ export function memoizeByRoot<F extends Function>(
 
   const wrap = (root: unknown, ...rest: Array<unknown>): unknown => {
     strictAssert(
-      typeof root === 'object' && root !== null,
+      typeof root === 'object' && root != null,
       'Root is not object'
     );
 

ts/util/sessionTranslation.ts

@@ -336,7 +336,7 @@ function binaryToUint8Array(
   length: number
 ): Uint8Array {
   const target = get(object, path);
-  if (target === null || target === undefined) {
+  if (target == null) {
     throw new Error(`binaryToUint8Array: Falsey path ${path}`);
   }
 
@@ -357,7 +357,7 @@ function binaryToUint8Array(
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 function getInteger(object: any, path: string): number {
   const target = get(object, path);
-  if (target === null || target === undefined) {
+  if (target == null) {
     throw new Error(`getInteger: Falsey path ${path}`);
   }