ts: Convert typing_data.js to TypeScript.

web/src/typing_data.ts

@@ -3,55 +3,49 @@ import * as util from "./util";
 
 // See docs/subsystems/typing-indicators.md for details on typing indicators.
 
-const typist_dct = new Map();
-const inbound_timer_dict = new Map();
+const typist_dct = new Map<string, number[]>();
+const inbound_timer_dict = new Map<string, ReturnType<typeof setInterval> | undefined>();
 
-export function clear_for_testing() {
+export function clear_for_testing(): void {
     typist_dct.clear();
     inbound_timer_dict.clear();
 }
 
-function to_int(s) {
-    return Number.parseInt(s, 10);
-}
-
-function get_key(group) {
+function get_key(group: number[]): string {
     const ids = util.sorted_ids(group);
     return ids.join(",");
 }
 
-export function add_typist(group, typist) {
+export function add_typist(group: number[], typist: number): void {
     const key = get_key(group);
     const current = typist_dct.get(key) || [];
-    typist = to_int(typist);
     if (!current.includes(typist)) {
         current.push(typist);
     }
     typist_dct.set(key, util.sorted_ids(current));
 }
 
-export function remove_typist(group, typist) {
+export function remove_typist(group: number[], typist: number): boolean {
     const key = get_key(group);
     let current = typist_dct.get(key) || [];
 
-    typist = to_int(typist);
     if (!current.includes(typist)) {
         return false;
     }
 
-    current = current.filter((user_id) => to_int(user_id) !== to_int(typist));
+    current = current.filter((user_id) => user_id !== typist);
 
     typist_dct.set(key, current);
     return true;
 }
 
-export function get_group_typists(group) {
+export function get_group_typists(group: number[]): number[] {
     const key = get_key(group);
     const user_ids = typist_dct.get(key) || [];
     return muted_users.filter_muted_user_ids(user_ids);
 }
 
-export function get_all_typists() {
+export function get_all_typists(): number[] {
     let typists = [...typist_dct.values()].flat();
     typists = util.sorted_ids(typists);
     return muted_users.filter_muted_user_ids(typists);
@@ -59,7 +53,7 @@ export function get_all_typists() {
 
 // The next functions aren't pure data, but it is easy
 // enough to mock the setTimeout/clearTimeout functions.
-export function clear_inbound_timer(group) {
+export function clear_inbound_timer(group: number[]): void {
     const key = get_key(group);
     const timer = inbound_timer_dict.get(key);
     if (timer) {
@@ -68,7 +62,11 @@ export function clear_inbound_timer(group) {
     }
 }
 
-export function kickstart_inbound_timer(group, delay, callback) {
+export function kickstart_inbound_timer(
+    group: number[],
+    delay: number,
+    callback: () => void,
+): void {
     const key = get_key(group);
     clear_inbound_timer(group);
     const timer = setTimeout(callback, delay);