compose_pm_pill: Convert module to TypeScript.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

web/src/compose_pm_pill.ts

@@ -1,17 +1,19 @@
 import $ from "jquery";
 
 import * as input_pill from "./input_pill";
+import type {User} from "./people";
 import * as people from "./people";
+import type {UserPillWidget} from "./user_pill";
 import * as user_pill from "./user_pill";
 import * as util from "./util";
 
-export let widget;
+export let widget: UserPillWidget;
 
 const pill_config = {
     show_user_status_emoji: true,
 };
 
-export function initialize_pill() {
+export function initialize_pill(): UserPillWidget {
     const $container = $("#private_message_recipient").parent();
 
     const pill = input_pill.create({
@@ -24,7 +26,7 @@ export function initialize_pill() {
     return pill;
 }
 
-export function initialize({on_pill_create_or_remove}) {
+export function initialize({on_pill_create_or_remove}: {on_pill_create_or_remove(): void}): void {
     widget = initialize_pill();
 
     widget.onPillCreate(() => {
@@ -37,45 +39,45 @@ export function initialize({on_pill_create_or_remove}) {
     });
 }
 
-export function clear() {
+export function clear(): void {
     widget.clear();
 }
 
-export function set_from_typeahead(person) {
+export function set_from_typeahead(person: User): void {
     user_pill.append_person({
         pill_widget: widget,
         person,
     });
 }
 
-export function set_from_emails(value) {
+export function set_from_emails(value: string): void {
     // value is something like "alice@example.com,bob@example.com"
     clear();
     widget.appendValue(value);
 }
 
-export function get_user_ids() {
+export function get_user_ids(): number[] {
     return user_pill.get_user_ids(widget);
 }
 
-export function has_unconverted_data() {
+export function has_unconverted_data(): boolean {
     return user_pill.has_unconverted_data(widget);
 }
 
-export function get_user_ids_string() {
+export function get_user_ids_string(): string {
     const user_ids = get_user_ids();
     const sorted_user_ids = util.sorted_ids(user_ids);
     const user_ids_string = sorted_user_ids.join(",");
     return user_ids_string;
 }
 
-export function get_emails() {
+export function get_emails(): string {
     // return something like "alice@example.com,bob@example.com"
     const user_ids = get_user_ids();
     const emails = user_ids.map((id) => people.get_by_user_id(id).email).join(",");
     return emails;
 }
 
-export function filter_taken_users(persons) {
+export function filter_taken_users(persons: User[]): User[] {
     return user_pill.filter_taken_users(persons, widget);
 }

web/src/user_pill.ts

@@ -14,7 +14,7 @@ type UserPill = {
     email: string;
 };
 
-type UserPillWidget = InputPillContainer<UserPill>;
+export type UserPillWidget = InputPillContainer<UserPill>;
 
 export function create_item_from_email(
     email: string,