condense: Convert module to Typescript.

tools/test-js-with-node

@@ -81,7 +81,7 @@ EXEMPT_FILES = make_set(
         "web/src/compose_ui.ts",
         "web/src/compose_validate.js",
         "web/src/composebox_typeahead.js",
-        "web/src/condense.js",
+        "web/src/condense.ts",
         "web/src/confirm_dialog.ts",
         "web/src/copied_tooltip.ts",
         "web/src/copy_and_paste.js",

web/src/condense.ts

@@ -3,6 +3,7 @@ import assert from "minimalistic-assert";
 
 import * as message_flags from "./message_flags";
 import * as message_lists from "./message_lists";
+import type {Message} from "./message_store";
 import * as message_viewport from "./message_viewport";
 import * as rows from "./rows";
 
@@ -18,35 +19,35 @@ This library implements two related, similar concepts:
 
 */
 
-function show_more_link($row) {
+function show_more_link($row: JQuery): void {
     $row.find(".message_condenser").hide();
     $row.find(".message_expander").show();
 }
 
-function show_condense_link($row) {
+function show_condense_link($row: JQuery): void {
     $row.find(".message_expander").hide();
     $row.find(".message_condenser").show();
 }
 
-function condense_row($row) {
+function condense_row($row: JQuery): void {
     const $content = $row.find(".message_content");
     $content.addClass("condensed");
     show_more_link($row);
 }
 
-function uncondense_row($row) {
+function uncondense_row($row: JQuery): void {
     const $content = $row.find(".message_content");
     $content.removeClass("condensed");
     show_condense_link($row);
 }
 
-export function uncollapse(message) {
+export function uncollapse(message: Message): void {
     // Uncollapse a message, restoring the condensed message "Show more" or
     // "Show less" button if necessary.
     message.collapsed = false;
     message_flags.save_uncollapsed(message);
 
-    const process_row = function process_row($row) {
+    const process_row = function process_row($row: JQuery): void {
         const $content = $row.find(".message_content");
         $content.removeClass("collapsed");
 
@@ -75,7 +76,7 @@ export function uncollapse(message) {
     }
 }
 
-export function collapse(message) {
+export function collapse(message: Message): void {
     message.collapsed = true;
 
     if (message.locally_echoed) {
@@ -88,7 +89,7 @@ export function collapse(message) {
 
     message_flags.save_collapsed(message);
 
-    const process_row = function process_row($row) {
+    const process_row = function process_row($row: JQuery): void {
         $row.find(".message_content").addClass("collapsed");
         show_more_link($row);
     };
@@ -101,7 +102,7 @@ export function collapse(message) {
     }
 }
 
-export function toggle_collapse(message) {
+export function toggle_collapse(message: Message): void {
     if (message.is_me_message) {
         // Disabled temporarily because /me messages don't have a
         // styling for collapsing /me messages (they only recently
@@ -146,38 +147,38 @@ export function toggle_collapse(message) {
     }
 }
 
-function get_message_height(elem) {
+function get_message_height(elem: HTMLElement): number {
     // This needs to be very fast. This function runs hundreds of times
     // when displaying a message feed view that has hundreds of message
     // history, which ideally should render in <100ms.
     return $(elem).find(".message_content")[0].scrollHeight;
 }
 
-export function hide_message_expander($row) {
+export function hide_message_expander($row: JQuery): void {
     if ($row.find(".could-be-condensed").length !== 0) {
         $row.find(".message_expander").hide();
     }
 }
 
-export function hide_message_condenser($row) {
+export function hide_message_condenser($row: JQuery): void {
     if ($row.find(".could-be-condensed").length !== 0) {
         $row.find(".message_condenser").hide();
     }
 }
 
-export function show_message_expander($row) {
+export function show_message_expander($row: JQuery): void {
     if ($row.find(".could-be-condensed").length !== 0) {
         $row.find(".message_expander").show();
     }
 }
 
-export function show_message_condenser($row) {
+export function show_message_condenser($row: JQuery): void {
     if ($row.find(".could-be-condensed").length !== 0) {
         $row.find(".message_condenser").show();
     }
 }
 
-export function condense_and_collapse(elems) {
+export function condense_and_collapse(elems: JQuery): void {
     if (message_lists.current === undefined) {
         return;
     }
@@ -205,7 +206,7 @@ export function condense_and_collapse(elems) {
             continue;
         }
 
-        const message_height = get_message_height(elem, message.id);
+        const message_height = get_message_height(elem);
 
         rows_to_resize.push({
             elem,
@@ -257,7 +258,7 @@ export function condense_and_collapse(elems) {
     }
 }
 
-export function initialize() {
+export function initialize(): void {
     $("#message_feed_container").on("click", ".message_expander", function (e) {
         // Expanding a message can mean either uncollapsing or
         // uncondensing it.
@@ -265,6 +266,7 @@ export function initialize() {
         const id = rows.id($row);
         assert(message_lists.current !== undefined);
         const message = message_lists.current.get(id);
+        assert(message !== undefined);
         // Focus on the expanded message.
         message_lists.current.select_id(id);
         const $content = $row.find(".message_content");
@@ -288,8 +290,9 @@ export function initialize() {
         // Focus on the condensed message.
         assert(message_lists.current !== undefined);
         message_lists.current.select_id(id);
-        message_lists.current.get(id).condensed = true;
-        condense_row($row);
+        const message = message_lists.current.get(id);
+        assert(message !== undefined);
+        message.condensed = true;
         e.stopPropagation();
         e.preventDefault();
     });

web/src/message_store.ts

@@ -86,6 +86,7 @@ export type MessageWithBooleans = (
     stream_wildcard_mentioned: boolean;
     topic_wildcard_mentioned: boolean;
     collapsed: boolean;
+    condensed?: boolean;
     alerted: boolean;
 };