Lint: Enabling 'strictNullChecks'

src/LogProxy.ts

@@ -26,7 +26,7 @@ const levelToFn = {
     [LogLevel.ERROR.toString()]: LogService.error,
 };
 
-export async function logMessage(level: LogLevel, module: string, message: string | any, additionalRoomIds: string[] | string = null, isRecursive = false) {
+export async function logMessage(level: LogLevel, module: string, message: string | any, additionalRoomIds: string[] | string | null = null, isRecursive = false) {
     if (!additionalRoomIds) additionalRoomIds = [];
     if (!Array.isArray(additionalRoomIds)) additionalRoomIds = [additionalRoomIds];
 

src/Mjolnir.ts

@@ -153,7 +153,7 @@ export class Mjolnir {
             await logMessage(LogLevel.DEBUG, "Mjolnir@startup", "Loading protected rooms...");
             await this.resyncJoinedRooms(false);
             try {
-                const data = await this.client.getAccountData(PROTECTED_ROOMS_EVENT_TYPE);
+                const data: Object|null = await this.client.getAccountData(PROTECTED_ROOMS_EVENT_TYPE);
                 if (data && data['rooms']) {
                     for (const roomId of data['rooms']) {
                         this.protectedRooms[roomId] = Permalinks.forRoom(roomId);
@@ -252,7 +252,7 @@ export class Mjolnir {
     private async getEnabledProtections() {
         let enabled: string[] = [];
         try {
-            const protections = await this.client.getAccountData(ENABLED_PROTECTIONS_EVENT_TYPE);
+            const protections: Object|null = await this.client.getAccountData(ENABLED_PROTECTIONS_EVENT_TYPE);
             if (protections && protections['enabled']) {
                 for (const protection of protections['enabled']) {
                     enabled.push(protection);
@@ -296,7 +296,7 @@ export class Mjolnir {
         await this.client.setAccountData(ENABLED_PROTECTIONS_EVENT_TYPE, {enabled: existing});
     }
 
-    public async watchList(roomRef: string): Promise<BanList> {
+    public async watchList(roomRef: string): Promise<BanList|null> {
         const joinedRooms = await this.client.getJoinedRooms();
         const permalink = Permalinks.parseUrl(roomRef);
         if (!permalink.roomIdOrAlias) return null;
@@ -321,12 +321,12 @@ export class Mjolnir {
         return list;
     }
 
-    public async unwatchList(roomRef: string): Promise<BanList> {
+    public async unwatchList(roomRef: string): Promise<BanList|null> {
         const permalink = Permalinks.parseUrl(roomRef);
         if (!permalink.roomIdOrAlias) return null;
 
         const roomId = await this.client.resolveRoom(permalink.roomIdOrAlias);
-        const list = this.banLists.find(b => b.roomId === roomId);
+        const list = this.banLists.find(b => b.roomId === roomId) || null;
         if (list) this.banLists.splice(this.banLists.indexOf(list), 1);
 
         await this.client.setAccountData(WATCHED_LISTS_EVENT_TYPE, {
@@ -347,7 +347,7 @@ export class Mjolnir {
         this.applyUnprotectedRooms();
 
         try {
-            const accountData = await this.client.getAccountData(WARN_UNPROTECTED_ROOM_EVENT_PREFIX + roomId);
+            const accountData: Object|null = await this.client.getAccountData(WARN_UNPROTECTED_ROOM_EVENT_PREFIX + roomId);
             if (accountData && accountData['warned']) return; // already warned
         } catch (e) {
             // Ignore - probably haven't warned about it yet
@@ -595,7 +595,7 @@ export class Mjolnir {
         }
     }
 
-    private async printActionResult(errors: RoomUpdateError[], title: string = null, logAnyways = false) {
+    private async printActionResult(errors: RoomUpdateError[], title: string|null = null, logAnyways = false) {
         if (errors.length <= 0) return false;
 
         if (!logAnyways) {

src/commands/ImportCommand.ts

@@ -53,7 +53,10 @@ export async function execImportCommand(roomId: string, event: any, mjolnir: Mjo
                     reason: reason,
                 };
                 const stateKey = `rule:${ruleContent.entity}`;
-                await mjolnir.client.sendStateEvent(list.roomId, ruleTypeToStable(RULE_USER), stateKey, ruleContent);
+                let stableRule = ruleTypeToStable(RULE_USER);
+                if (stableRule) {
+                    await mjolnir.client.sendStateEvent(list.roomId, stableRule, stateKey, ruleContent);
+                }
                 importedRules++;
             }
         } else if (stateEvent['type'] === 'm.room.server_acl' && stateEvent['state_key'] === '') {
@@ -71,7 +74,10 @@ export async function execImportCommand(roomId: string, event: any, mjolnir: Mjo
                     reason: reason,
                 };
                 const stateKey = `rule:${ruleContent.entity}`;
-                await mjolnir.client.sendStateEvent(list.roomId, ruleTypeToStable(RULE_SERVER), stateKey, ruleContent);
+                let stableRule = ruleTypeToStable(RULE_SERVER);
+                if (stableRule) {
+                    await mjolnir.client.sendStateEvent(list.roomId, stableRule, stateKey, ruleContent);
+                }
                 importedRules++;
             }
         }

src/commands/RedactCommand.ts

@@ -21,8 +21,8 @@ import { Permalinks } from "matrix-bot-sdk";
 // !mjolnir redact <user ID> [room alias] [limit]
 export async function execRedactCommand(roomId: string, event: any, mjolnir: Mjolnir, parts: string[]) {
     const userId = parts[2];
-    let roomAlias = null;
+    let roomAlias: string|null = null;
-    let limit = Number.parseInt(parts.length > 3 ? parts[3] : null, 10); // default to NaN for later
+    let limit = Number.parseInt(parts.length > 3 ? parts[3] : "", 10); // default to NaN for later
     if (parts.length > 3 && isNaN(limit)) {
         roomAlias = await mjolnir.client.resolveRoom(parts[3]);
         if (parts.length > 4) {

src/commands/UnbanBanCommand.ts

@@ -23,17 +23,17 @@ import { logMessage } from "../LogProxy";
 import { DEFAULT_LIST_EVENT_TYPE } from "./SetDefaultBanListCommand";
 
 interface Arguments {
-    list: BanList;
+    list: BanList | null;
     entity: string;
-    ruleType: string;
+    ruleType: string | null;
     reason: string;
 }
 
 // Exported for tests
-export async function parseArguments(roomId: string, event: any, mjolnir: Mjolnir, parts: string[]): Promise<Arguments> {
+export async function parseArguments(roomId: string, event: any, mjolnir: Mjolnir, parts: string[]): Promise<Arguments|null> {
     let defaultShortcode = null;
     try {
-        const data = await mjolnir.client.getAccountData(DEFAULT_LIST_EVENT_TYPE);
+        const data: Object = await mjolnir.client.getAccountData(DEFAULT_LIST_EVENT_TYPE);
         defaultShortcode = data['shortcode'];
     } catch (e) {
         LogService.warn("UnbanBanCommand", "Non-fatal error getting default ban list");
@@ -43,9 +43,9 @@ export async function parseArguments(roomId: string, event: any, mjolnir: Mjolni
     }
 
     let argumentIndex = 2;
-    let ruleType = null;
+    let ruleType: string | null = null;
-    let entity = null;
+    let entity: string | null = null;
-    let list = null;
+    let list: BanList | null = null;
     let force = false;
     while (argumentIndex < 7 && argumentIndex < parts.length) {
         const arg = parts[argumentIndex++];
@@ -62,7 +62,7 @@ export async function parseArguments(roomId: string, event: any, mjolnir: Mjolni
             else if (!ruleType) ruleType = RULE_SERVER;
         } else if (!list) {
             const foundList = mjolnir.lists.find(b => b.listShortcode.toLowerCase() === arg.toLowerCase());
-            if (foundList) {
+            if (foundList !== undefined) {
                 list = foundList;
             }
         }
@@ -88,10 +88,10 @@ export async function parseArguments(roomId: string, event: any, mjolnir: Mjolni
     }
 
     if (!list) {
-        list = mjolnir.lists.find(b => b.listShortcode.toLowerCase() === defaultShortcode);
+        list = mjolnir.lists.find(b => b.listShortcode.toLowerCase() === defaultShortcode) || null;
     }
 
-    let replyMessage = null;
+    let replyMessage: string | null = null;
     if (!list) replyMessage = "No ban list matching that shortcode was found";
     else if (!ruleType) replyMessage = "Please specify the type as either 'user', 'room', or 'server'";
     else if (!entity) replyMessage = "No entity found";
@@ -128,7 +128,7 @@ export async function execBanCommand(roomId: string, event: any, mjolnir: Mjolni
     };
     const stateKey = `rule:${bits.entity}`;
 
-    await mjolnir.client.sendStateEvent(bits.list.roomId, bits.ruleType, stateKey, ruleContent);
+    await mjolnir.client.sendStateEvent(bits.list!.roomId, bits.ruleType!, stateKey, ruleContent);
     await mjolnir.client.unstableApis.addReactionToEvent(roomId, event['event_id'], '✅');
 }
 
@@ -140,14 +140,14 @@ export async function execUnbanCommand(roomId: string, event: any, mjolnir: Mjol
     const ruleContent = {}; // empty == clear/unban
     const stateKey = `rule:${bits.entity}`;
 
-    await mjolnir.client.sendStateEvent(bits.list.roomId, bits.ruleType, stateKey, ruleContent);
+    await mjolnir.client.sendStateEvent(bits.list!.roomId, bits.ruleType!, stateKey, ruleContent);
 
-    if (USER_RULE_TYPES.includes(bits.ruleType) && bits.reason === 'true') {
+    if (USER_RULE_TYPES.includes(bits.ruleType!) && bits.reason === 'true') {
         const rule = new MatrixGlob(bits.entity);
         await logMessage(LogLevel.INFO, "UnbanBanCommand", "Unbanning users that match glob: " + bits.entity);
         let unbannedSomeone = false;
         for (const protectedRoomId of Object.keys(mjolnir.protectedRooms)) {
-            const members = await mjolnir.client.getRoomMembers(protectedRoomId, null, ['ban'], null);
+            const members = await mjolnir.client.getRoomMembers(protectedRoomId, undefined, ['ban'], undefined);
             await logMessage(LogLevel.DEBUG, "UnbanBanCommand", `Found ${members.length} banned user(s)`);
             for (const member of members) {
                 const victim = member.membershipFor;

src/config.ts

@@ -66,7 +66,7 @@ interface IConfig {
      * here as much as possible.
      */
     RUNTIME: {
-        client: MatrixClient;
+        client?: MatrixClient;
     };
 }
 
@@ -116,7 +116,6 @@ const defaultConfig: IConfig = {
 
     // Needed to make the interface happy.
     RUNTIME: {
-        client: null,
     },
 };
 

src/index.ts

@@ -32,7 +32,7 @@ import { MembershipEvent } from "matrix-bot-sdk/lib/models/events/MembershipEven
 import * as htmlEscape from "escape-html";
 import { Healthz } from "./health/healthz";
 
-config.RUNTIME = {client: null};
+config.RUNTIME = {};
 
 LogService.setLogger(new RichConsoleLogger());
 LogService.setLevel(LogLevel.fromString(config.logLevel, LogLevel.DEBUG));

src/models/BanList.ts

@@ -28,7 +28,7 @@ export const ALL_RULE_TYPES = [...USER_RULE_TYPES, ...ROOM_RULE_TYPES, ...SERVER
 
 export const SHORTCODE_EVENT_TYPE = "org.matrix.mjolnir.shortcode";
 
-export function ruleTypeToStable(rule: string, unstable = true): string {
+export function ruleTypeToStable(rule: string, unstable = true): string|null {
     if (USER_RULE_TYPES.includes(rule)) return unstable ? USER_RULE_TYPES[USER_RULE_TYPES.length - 1] : RULE_USER;
     if (ROOM_RULE_TYPES.includes(rule)) return unstable ? ROOM_RULE_TYPES[ROOM_RULE_TYPES.length - 1] : RULE_ROOM;
     if (SERVER_RULE_TYPES.includes(rule)) return unstable ? SERVER_RULE_TYPES[SERVER_RULE_TYPES.length - 1] : RULE_SERVER;
@@ -37,7 +37,7 @@ export function ruleTypeToStable(rule: string, unstable = true): string {
 
 export default class BanList {
     private rules: ListRule[] = [];
-    private shortcode: string = null;
+    private shortcode: string|null = null;
 
     constructor(public readonly roomId: string, public readonly roomRef, private client: MatrixClient) {
     }
@@ -85,7 +85,7 @@ export default class BanList {
                 continue;
             }
 
-            let kind: string = null;
+            let kind: string|null = null;
             if (USER_RULE_TYPES.includes(event['type'])) {
                 kind = RULE_USER;
             } else if (ROOM_RULE_TYPES.includes(event['type'])) {

src/models/ListRule.ts

@@ -19,7 +19,7 @@ import { MatrixGlob } from "matrix-bot-sdk";
 export const RECOMMENDATION_BAN = "m.ban";
 export const RECOMMENDATION_BAN_TYPES = [RECOMMENDATION_BAN, "org.matrix.mjolnir.ban"];
 
-export function recommendationToStable(recommendation: string, unstable = true): string {
+export function recommendationToStable(recommendation: string, unstable = true): string|null {
     if (RECOMMENDATION_BAN_TYPES.includes(recommendation)) return unstable ? RECOMMENDATION_BAN_TYPES[RECOMMENDATION_BAN_TYPES.length - 1] : RECOMMENDATION_BAN;
     return null;
 }

src/utils.ts

@@ -150,7 +150,7 @@ export async function getMessagesByUserIn(client: MatrixClient, sender: string,
     let token = timeline['prev_batch'] || response['next_batch'];
     let bfMessages = {chunk: syncedMessages, end: token};
     do {
-        const messages = [];
+        const messages: any[] = [];
         for (const event of (bfMessages['chunk'] || [])) {
             if (processed >= limit) return; // we're done even if we don't want to be
             processed++;
@@ -199,7 +199,9 @@ export async function replaceRoomIdsWithPills(client: MatrixClient, text: string
         }
         const regexRoomId = new RegExp(escapeRegex(roomId), "g");
         content.body = content.body.replace(regexRoomId, alias);
-        content.formatted_body = content.formatted_body.replace(regexRoomId, `<a href="${Permalinks.forRoom(alias, viaServers)}">${alias}</a>`);
+        if (content.formatted_body) {
+            content.formatted_body = content.formatted_body.replace(regexRoomId, `<a href="${Permalinks.forRoom(alias, viaServers)}">${alias}</a>`);
+        }
     }
 
     return content;

tsconfig.json

@@ -9,6 +9,7 @@
         "target": "es2015",
         "noImplicitAny": false,
         "sourceMap": true,
+        "strictNullChecks": true,
         "outDir": "./lib",
         "types": [
             "node",