diff --git a/tools/test-js-with-node b/tools/test-js-with-node
index 1c774dcba2..ce6d429e6d 100755
--- a/tools/test-js-with-node
+++ b/tools/test-js-with-node
@@ -69,6 +69,7 @@ EXEMPT_FILES = make_set(
         "web/src/compose_fade.js",
         "web/src/compose_popovers.js",
         "web/src/compose_recipient.js",
+        "web/src/compose_setup.js",
         "web/src/compose_state.js",
         "web/src/compose_textarea.ts",
         "web/src/compose_tooltips.js",
diff --git a/web/src/compose.js b/web/src/compose.js
index 96cfcb133c..2514fd6156 100644
--- a/web/src/compose.js
+++ b/web/src/compose.js
@@ -7,41 +7,25 @@ import _ from "lodash";
 import render_success_message_scheduled_banner from "../templates/compose_banner/success_message_scheduled_banner.hbs";
 
 import * as channel from "./channel";
-import * as compose_actions from "./compose_actions";
 import * as compose_banner from "./compose_banner";
 import * as compose_call from "./compose_call";
-import * as compose_call_ui from "./compose_call_ui";
-import * as compose_recipient from "./compose_recipient";
 import * as compose_state from "./compose_state";
 import * as compose_ui from "./compose_ui";
 import * as compose_validate from "./compose_validate";
 import * as drafts from "./drafts";
 import * as echo from "./echo";
-import * as flatpickr from "./flatpickr";
 import {$t_html} from "./i18n";
 import * as loading from "./loading";
 import * as markdown from "./markdown";
-import * as message_edit from "./message_edit";
 import * as message_events from "./message_events";
-import * as narrow from "./narrow";
 import {page_params} from "./page_params";
 import * as people from "./people";
 import * as rendered_markdown from "./rendered_markdown";
-import * as resize from "./resize";
-import * as rows from "./rows";
 import * as scheduled_messages from "./scheduled_messages";
-import * as scheduled_messages_popover from "./scheduled_messages_popover";
 import * as sent_messages from "./sent_messages";
 import * as server_events from "./server_events";
-import * as stream_data from "./stream_data";
-import * as stream_settings_ui from "./stream_settings_ui";
-import * as sub_store from "./sub_store";
-import * as subscriber_api from "./subscriber_api";
-import {get_timestamp_for_flatpickr} from "./timerender";
 import * as transmit from "./transmit";
-import * as upload from "./upload";
 import {user_settings} from "./user_settings";
-import * as user_topics from "./user_topics";
 import * as util from "./util";
 import * as zcommand from "./zcommand";
 
@@ -89,11 +73,6 @@ export function clear_preview_area() {
     $("#compose .preview_mode_disabled .compose_control_button").attr("tabindex", 0);
 }
 
-export function abort_xhr() {
-    $("#compose-send-button").prop("disabled", false);
-    upload.compose_upload_object.cancelAll();
-}
-
 export function create_message_object() {
     // Topics are optional, and we provide a placeholder if one isn't given.
     let topic = compose_state.topic();
@@ -378,365 +357,6 @@ export function render_and_show_preview($preview_spinner, $preview_content_box,
     }
 }
 
-function setup_compose_actions_hooks() {
-    compose_actions.register_compose_box_clear_hook(clear_invites);
-    compose_actions.register_compose_box_clear_hook(clear_private_stream_alert);
-    compose_actions.register_compose_box_clear_hook(clear_preview_area);
-
-    compose_actions.register_compose_cancel_hook(abort_xhr);
-    compose_actions.register_compose_cancel_hook(compose_call.abort_video_callbacks);
-}
-
-export function initialize() {
-    // Register hooks for compose_actions.
-    setup_compose_actions_hooks();
-
-    $("#below-compose-content .video_link").toggle(compose_call.compute_show_video_chat_button());
-    $("#below-compose-content .audio_link").toggle(compose_call.compute_show_audio_chat_button());
-
-    $("#compose-textarea").on("keydown", (event) => {
-        compose_ui.handle_keydown(event, $("#compose-textarea").expectOne());
-    });
-    $("#compose-textarea").on("keyup", (event) => {
-        compose_ui.handle_keyup(event, $("#compose-textarea").expectOne());
-    });
-
-    $("#compose-textarea").on("input propertychange", () => {
-        compose_validate.warn_if_topic_resolved(false);
-        const compose_text_length = compose_validate.check_overflow_text();
-        if (compose_text_length !== 0 && $("#compose-textarea").hasClass("invalid")) {
-            $("#compose-textarea").toggleClass("invalid", false);
-        }
-        // Change compose close button tooltip as per condition.
-        // We save compose text in draft only if its length is > 2.
-        if (compose_text_length > 2) {
-            $("#compose_close").attr(
-                "data-tooltip-template-id",
-                "compose_close_and_save_tooltip_template",
-            );
-        } else {
-            $("#compose_close").attr("data-tooltip-template-id", "compose_close_tooltip_template");
-        }
-    });
-
-    $("#compose form").on("submit", (e) => {
-        e.preventDefault();
-        finish();
-    });
-
-    resize.watch_manual_resize("#compose-textarea");
-
-    // Updates compose max-height and scroll to bottom button position when
-    // there is a change in compose height like when a compose banner is displayed.
-    const update_compose_max_height = new ResizeObserver(resize.reset_compose_message_max_height);
-    update_compose_max_height.observe(document.querySelector("#compose"));
-
-    upload.feature_check($("#compose .compose_upload_file"));
-
-    function get_input_info(event) {
-        const $edit_banners_container = $(event.target).closest(".edit_form_banners");
-        const is_edit_input = Boolean($edit_banners_container.length);
-        const $banner_container = $edit_banners_container.length
-            ? $edit_banners_container
-            : $("#compose_banners");
-        return {is_edit_input, $banner_container};
-    }
-
-    $("body").on(
-        "click",
-        `.${CSS.escape(
-            compose_banner.CLASSNAMES.wildcard_warning,
-        )} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-            const {$banner_container, is_edit_input} = get_input_info(event);
-            const $row = $(event.target).closest(".message_row");
-            compose_validate.clear_wildcard_warnings($banner_container);
-            compose_validate.set_user_acknowledged_wildcard_flag(true);
-            if (is_edit_input) {
-                message_edit.save_message_row_edit($row);
-            } else if (event.target.dataset.validationTrigger === "schedule") {
-                scheduled_messages_popover.open_send_later_menu();
-
-                // We need to set this flag to true here because `open_send_later_menu` validates the message and sets
-                // the user acknowledged wildcard flag back to 'false' and we don't want that to happen because then it
-                // would again show the wildcard warning banner when we actually send the message from 'send-later' modal.
-                compose_validate.set_user_acknowledged_wildcard_flag(true);
-            } else {
-                finish();
-            }
-        },
-    );
-
-    const user_not_subscribed_selector = `.${CSS.escape(
-        compose_banner.CLASSNAMES.user_not_subscribed,
-    )}`;
-    $("body").on(
-        "click",
-        `${user_not_subscribed_selector} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-
-            const stream_id = compose_state.stream_id();
-            if (stream_id === "") {
-                return;
-            }
-            const sub = stream_data.get_sub_by_id(stream_id);
-            stream_settings_ui.sub_or_unsub(sub);
-            $(user_not_subscribed_selector).remove();
-        },
-    );
-
-    $("body").on(
-        "click",
-        `.${CSS.escape(compose_banner.CLASSNAMES.topic_resolved)} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-
-            const $target = $(event.target).parents(".main-view-banner");
-            const stream_id = Number.parseInt($target.attr("data-stream-id"), 10);
-            const topic_name = $target.attr("data-topic-name");
-
-            message_edit.with_first_message_id(stream_id, topic_name, (message_id) => {
-                message_edit.toggle_resolve_topic(message_id, topic_name, true);
-                compose_validate.clear_topic_resolved_warning(true);
-            });
-        },
-    );
-
-    $("body").on(
-        "click",
-        `.${CSS.escape(
-            compose_banner.CLASSNAMES.unmute_topic_notification,
-        )} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-
-            const $target = $(event.target).parents(".main-view-banner");
-            const stream_id = Number.parseInt($target.attr("data-stream-id"), 10);
-            const topic_name = $target.attr("data-topic-name");
-
-            user_topics.set_user_topic_visibility_policy(
-                stream_id,
-                topic_name,
-                user_topics.all_visibility_policies.UNMUTED,
-                false,
-                true,
-            );
-        },
-    );
-
-    $("body").on(
-        "click",
-        `.${CSS.escape(
-            compose_banner.CLASSNAMES.unscheduled_message,
-        )} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-            const send_at_timestamp = scheduled_messages.get_selected_send_later_timestamp();
-            scheduled_messages_popover.do_schedule_message(send_at_timestamp);
-        },
-    );
-
-    $("body").on(
-        "click",
-        `.${CSS.escape(
-            compose_banner.CLASSNAMES.recipient_not_subscribed,
-        )} .main-view-banner-action-button`,
-        (event) => {
-            event.preventDefault();
-            const {$banner_container} = get_input_info(event);
-            const $invite_row = $(event.target).parents(".main-view-banner");
-
-            const user_id = Number.parseInt($invite_row.data("user-id"), 10);
-            const stream_id = Number.parseInt($invite_row.data("stream-id"), 10);
-
-            function success() {
-                $invite_row.remove();
-            }
-
-            function xhr_failure(xhr) {
-                let error_message = "Failed to subscribe user!";
-                if (xhr.responseJSON?.msg) {
-                    error_message = xhr.responseJSON.msg;
-                }
-                clear_invites();
-                compose_banner.show_error_message(
-                    error_message,
-                    compose_banner.CLASSNAMES.generic_compose_error,
-                    $banner_container,
-                    $("#compose-textarea"),
-                );
-                $(event.target).prop("disabled", true);
-            }
-
-            const sub = sub_store.get(stream_id);
-
-            subscriber_api.add_user_ids_to_stream([user_id], sub, success, xhr_failure);
-        },
-    );
-
-    for (const classname of Object.values(compose_banner.CLASSNAMES)) {
-        const classname_selector = `.${CSS.escape(classname)}`;
-        $("body").on("click", `${classname_selector} .main-view-banner-close-button`, (event) => {
-            event.preventDefault();
-            $(event.target).parents(classname_selector).remove();
-        });
-    }
-
-    // Click event binding for "Attach files" button
-    // Triggers a click on a hidden file input field
-
-    $("#compose").on("click", ".compose_upload_file", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        $("#compose .file_input").trigger("click");
-    });
-
-    $("body").on("click", ".video_link", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        const show_video_chat_button = compose_call.compute_show_video_chat_button();
-
-        if (!show_video_chat_button) {
-            return;
-        }
-
-        compose_call_ui.generate_and_insert_audio_or_video_call_link($(e.target), false);
-    });
-
-    $("body").on("click", ".audio_link", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        const show_audio_chat_button = compose_call.compute_show_audio_chat_button();
-
-        if (!show_audio_chat_button) {
-            return;
-        }
-
-        compose_call_ui.generate_and_insert_audio_or_video_call_link($(e.target), true);
-    });
-
-    $("body").on("click", ".time_pick", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        let $target_textarea;
-        let edit_message_id;
-        const compose_click_target = compose_ui.get_compose_click_target(e);
-        if ($(compose_click_target).parents(".message_edit_form").length === 1) {
-            edit_message_id = rows.id($(compose_click_target).parents(".message_row"));
-            $target_textarea = $(`#edit_form_${CSS.escape(edit_message_id)} .message_edit_content`);
-        } else {
-            $target_textarea = $(compose_click_target).closest("form").find("textarea");
-        }
-
-        if (!flatpickr.is_open()) {
-            const on_timestamp_selection = (val) => {
-                const timestr = `<time:${val}> `;
-                compose_ui.insert_syntax_and_focus(timestr, $target_textarea);
-            };
-
-            flatpickr.show_flatpickr(
-                $(compose_click_target)[0],
-                on_timestamp_selection,
-                get_timestamp_for_flatpickr(),
-                {
-                    // place the time picker wherever there is space and center it horizontally
-                    position: "auto center",
-                    // Since we want to handle close of flatpickr manually, we don't want
-                    // flatpickr to hide automatically on clicking its trigger element.
-                    ignoredFocusElements: [e.currentTarget],
-                },
-            );
-        } else {
-            flatpickr.flatpickr_instance?.close();
-        }
-    });
-
-    $("#compose").on("click", ".markdown_preview", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        // Disable unneeded compose_control_buttons as we don't
-        // need them in preview mode.
-        $("#compose").addClass("preview_mode");
-        $("#compose .preview_mode_disabled .compose_control_button").attr("tabindex", -1);
-
-        const content = $("#compose-textarea").val();
-        $("#compose-textarea").hide();
-        $("#compose .markdown_preview").hide();
-        $("#compose .undo_markdown_preview").show();
-        $("#compose .undo_markdown_preview").trigger("focus");
-        $("#compose .preview_message_area").show();
-
-        render_and_show_preview(
-            $("#compose .markdown_preview_spinner"),
-            $("#compose .preview_content"),
-            content,
-        );
-    });
-
-    $("#compose").on("click", ".undo_markdown_preview", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        clear_preview_area();
-    });
-
-    $("#compose").on("click", ".expand_composebox_button", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        compose_ui.make_compose_box_full_size();
-    });
-
-    $("#compose").on("click", ".narrow_to_compose_recipients", (e) => {
-        e.preventDefault();
-        narrow.to_compose_target();
-    });
-
-    $("#compose").on("click", ".collapse_composebox_button", (e) => {
-        e.preventDefault();
-        e.stopPropagation();
-
-        compose_ui.make_compose_box_original_size();
-    });
-
-    $("#compose-textarea").on("focus", () => {
-        compose_recipient.update_placeholder_text();
-    });
-
-    $("#stream_message_recipient_topic").on("focus", () => {
-        compose_recipient.update_placeholder_text();
-    });
-
-    $("#stream_message_recipient_topic").on("input", () => {
-        compose_recipient.update_placeholder_text();
-    });
-
-    $("body").on("click", ".formatting_button", (e) => {
-        const $compose_click_target = $(compose_ui.get_compose_click_target(e));
-        const $textarea = $compose_click_target.closest("form").find("textarea");
-        const format_type = $(e.target).attr("data-format-type");
-        compose_ui.format_text($textarea, format_type);
-        $textarea.trigger("focus");
-        e.preventDefault();
-        e.stopPropagation();
-    });
-
-    if (page_params.narrow !== undefined) {
-        if (page_params.narrow_topic !== undefined) {
-            compose_actions.start("stream", {topic: page_params.narrow_topic});
-        } else {
-            compose_actions.start("stream", {});
-        }
-    }
-}
-
 function schedule_message_to_custom_date() {
     const compose_message_object = create_message_object();
 
diff --git a/web/src/compose_setup.js b/web/src/compose_setup.js
new file mode 100644
index 0000000000..89a466c285
--- /dev/null
+++ b/web/src/compose_setup.js
@@ -0,0 +1,390 @@
+import $ from "jquery";
+
+import * as compose from "./compose";
+import * as compose_actions from "./compose_actions";
+import * as compose_banner from "./compose_banner";
+import * as compose_call from "./compose_call";
+import * as compose_call_ui from "./compose_call_ui";
+import * as compose_recipient from "./compose_recipient";
+import * as compose_state from "./compose_state";
+import * as compose_ui from "./compose_ui";
+import * as compose_validate from "./compose_validate";
+import * as flatpickr from "./flatpickr";
+import * as message_edit from "./message_edit";
+import * as narrow from "./narrow";
+import {page_params} from "./page_params";
+import * as resize from "./resize";
+import * as rows from "./rows";
+import * as scheduled_messages from "./scheduled_messages";
+import * as scheduled_messages_popover from "./scheduled_messages_popover";
+import * as stream_data from "./stream_data";
+import * as stream_settings_ui from "./stream_settings_ui";
+import * as sub_store from "./sub_store";
+import * as subscriber_api from "./subscriber_api";
+import {get_timestamp_for_flatpickr} from "./timerender";
+import * as upload from "./upload";
+import * as user_topics from "./user_topics";
+
+export function abort_xhr() {
+    $("#compose-send-button").prop("disabled", false);
+    upload.compose_upload_object.cancelAll();
+}
+
+function setup_compose_actions_hooks() {
+    compose_actions.register_compose_box_clear_hook(compose.clear_invites);
+    compose_actions.register_compose_box_clear_hook(compose.clear_private_stream_alert);
+    compose_actions.register_compose_box_clear_hook(compose.clear_preview_area);
+
+    compose_actions.register_compose_cancel_hook(abort_xhr);
+    compose_actions.register_compose_cancel_hook(compose_call.abort_video_callbacks);
+}
+
+export function initialize() {
+    // Register hooks for compose_actions.
+    setup_compose_actions_hooks();
+
+    $("#below-compose-content .video_link").toggle(compose_call.compute_show_video_chat_button());
+    $("#below-compose-content .audio_link").toggle(compose_call.compute_show_audio_chat_button());
+
+    $("#compose-textarea").on("keydown", (event) => {
+        compose_ui.handle_keydown(event, $("#compose-textarea").expectOne());
+    });
+    $("#compose-textarea").on("keyup", (event) => {
+        compose_ui.handle_keyup(event, $("#compose-textarea").expectOne());
+    });
+
+    $("#compose-textarea").on("input propertychange", () => {
+        compose_validate.warn_if_topic_resolved(false);
+        const compose_text_length = compose_validate.check_overflow_text();
+        if (compose_text_length !== 0 && $("#compose-textarea").hasClass("invalid")) {
+            $("#compose-textarea").toggleClass("invalid", false);
+        }
+        // Change compose close button tooltip as per condition.
+        // We save compose text in draft only if its length is > 2.
+        if (compose_text_length > 2) {
+            $("#compose_close").attr(
+                "data-tooltip-template-id",
+                "compose_close_and_save_tooltip_template",
+            );
+        } else {
+            $("#compose_close").attr("data-tooltip-template-id", "compose_close_tooltip_template");
+        }
+    });
+
+    $("#compose form").on("submit", (e) => {
+        e.preventDefault();
+        compose.finish();
+    });
+
+    resize.watch_manual_resize("#compose-textarea");
+
+    // Updates compose max-height and scroll to bottom button position when
+    // there is a change in compose height like when a compose banner is displayed.
+    const update_compose_max_height = new ResizeObserver(resize.reset_compose_message_max_height);
+    update_compose_max_height.observe(document.querySelector("#compose"));
+
+    upload.feature_check($("#compose .compose_upload_file"));
+
+    function get_input_info(event) {
+        const $edit_banners_container = $(event.target).closest(".edit_form_banners");
+        const is_edit_input = Boolean($edit_banners_container.length);
+        const $banner_container = $edit_banners_container.length
+            ? $edit_banners_container
+            : $("#compose_banners");
+        return {is_edit_input, $banner_container};
+    }
+
+    $("body").on(
+        "click",
+        `.${CSS.escape(
+            compose_banner.CLASSNAMES.wildcard_warning,
+        )} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+            const {$banner_container, is_edit_input} = get_input_info(event);
+            const $row = $(event.target).closest(".message_row");
+            compose_validate.clear_wildcard_warnings($banner_container);
+            compose_validate.set_user_acknowledged_wildcard_flag(true);
+            if (is_edit_input) {
+                message_edit.save_message_row_edit($row);
+            } else if (event.target.dataset.validationTrigger === "schedule") {
+                scheduled_messages_popover.open_send_later_menu();
+
+                // We need to set this flag to true here because `open_send_later_menu` validates the message and sets
+                // the user acknowledged wildcard flag back to 'false' and we don't want that to happen because then it
+                // would again show the wildcard warning banner when we actually send the message from 'send-later' modal.
+                compose_validate.set_user_acknowledged_wildcard_flag(true);
+            } else {
+                compose.finish();
+            }
+        },
+    );
+
+    const user_not_subscribed_selector = `.${CSS.escape(
+        compose_banner.CLASSNAMES.user_not_subscribed,
+    )}`;
+    $("body").on(
+        "click",
+        `${user_not_subscribed_selector} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+
+            const stream_id = compose_state.stream_id();
+            if (stream_id === "") {
+                return;
+            }
+            const sub = stream_data.get_sub_by_id(stream_id);
+            stream_settings_ui.sub_or_unsub(sub);
+            $(user_not_subscribed_selector).remove();
+        },
+    );
+
+    $("body").on(
+        "click",
+        `.${CSS.escape(compose_banner.CLASSNAMES.topic_resolved)} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+
+            const $target = $(event.target).parents(".main-view-banner");
+            const stream_id = Number.parseInt($target.attr("data-stream-id"), 10);
+            const topic_name = $target.attr("data-topic-name");
+
+            message_edit.with_first_message_id(stream_id, topic_name, (message_id) => {
+                message_edit.toggle_resolve_topic(message_id, topic_name, true);
+                compose_validate.clear_topic_resolved_warning(true);
+            });
+        },
+    );
+
+    $("body").on(
+        "click",
+        `.${CSS.escape(
+            compose_banner.CLASSNAMES.unmute_topic_notification,
+        )} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+
+            const $target = $(event.target).parents(".main-view-banner");
+            const stream_id = Number.parseInt($target.attr("data-stream-id"), 10);
+            const topic_name = $target.attr("data-topic-name");
+
+            user_topics.set_user_topic_visibility_policy(
+                stream_id,
+                topic_name,
+                user_topics.all_visibility_policies.UNMUTED,
+                false,
+                true,
+            );
+        },
+    );
+
+    $("body").on(
+        "click",
+        `.${CSS.escape(
+            compose_banner.CLASSNAMES.unscheduled_message,
+        )} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+            const send_at_timestamp = scheduled_messages.get_selected_send_later_timestamp();
+            scheduled_messages_popover.do_schedule_message(send_at_timestamp);
+        },
+    );
+
+    $("body").on(
+        "click",
+        `.${CSS.escape(
+            compose_banner.CLASSNAMES.recipient_not_subscribed,
+        )} .main-view-banner-action-button`,
+        (event) => {
+            event.preventDefault();
+            const {$banner_container} = get_input_info(event);
+            const $invite_row = $(event.target).parents(".main-view-banner");
+
+            const user_id = Number.parseInt($invite_row.data("user-id"), 10);
+            const stream_id = Number.parseInt($invite_row.data("stream-id"), 10);
+
+            function success() {
+                $invite_row.remove();
+            }
+
+            function xhr_failure(xhr) {
+                let error_message = "Failed to subscribe user!";
+                if (xhr.responseJSON?.msg) {
+                    error_message = xhr.responseJSON.msg;
+                }
+                compose.clear_invites();
+                compose_banner.show_error_message(
+                    error_message,
+                    compose_banner.CLASSNAMES.generic_compose_error,
+                    $banner_container,
+                    $("#compose-textarea"),
+                );
+                $(event.target).prop("disabled", true);
+            }
+
+            const sub = sub_store.get(stream_id);
+
+            subscriber_api.add_user_ids_to_stream([user_id], sub, success, xhr_failure);
+        },
+    );
+
+    for (const classname of Object.values(compose_banner.CLASSNAMES)) {
+        const classname_selector = `.${CSS.escape(classname)}`;
+        $("body").on("click", `${classname_selector} .main-view-banner-close-button`, (event) => {
+            event.preventDefault();
+            $(event.target).parents(classname_selector).remove();
+        });
+    }
+
+    // Click event binding for "Attach files" button
+    // Triggers a click on a hidden file input field
+
+    $("#compose").on("click", ".compose_upload_file", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        $("#compose .file_input").trigger("click");
+    });
+
+    $("body").on("click", ".video_link", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        const show_video_chat_button = compose_call.compute_show_video_chat_button();
+
+        if (!show_video_chat_button) {
+            return;
+        }
+
+        compose_call_ui.generate_and_insert_audio_or_video_call_link($(e.target), false);
+    });
+
+    $("body").on("click", ".audio_link", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        const show_audio_chat_button = compose_call.compute_show_audio_chat_button();
+
+        if (!show_audio_chat_button) {
+            return;
+        }
+
+        compose_call_ui.generate_and_insert_audio_or_video_call_link($(e.target), true);
+    });
+
+    $("body").on("click", ".time_pick", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        let $target_textarea;
+        let edit_message_id;
+        const compose_click_target = compose_ui.get_compose_click_target(e);
+        if ($(compose_click_target).parents(".message_edit_form").length === 1) {
+            edit_message_id = rows.id($(compose_click_target).parents(".message_row"));
+            $target_textarea = $(`#edit_form_${CSS.escape(edit_message_id)} .message_edit_content`);
+        } else {
+            $target_textarea = $(compose_click_target).closest("form").find("textarea");
+        }
+
+        if (!flatpickr.is_open()) {
+            const on_timestamp_selection = (val) => {
+                const timestr = `<time:${val}> `;
+                compose_ui.insert_syntax_and_focus(timestr, $target_textarea);
+            };
+
+            flatpickr.show_flatpickr(
+                $(compose_click_target)[0],
+                on_timestamp_selection,
+                get_timestamp_for_flatpickr(),
+                {
+                    // place the time picker wherever there is space and center it horizontally
+                    position: "auto center",
+                    // Since we want to handle close of flatpickr manually, we don't want
+                    // flatpickr to hide automatically on clicking its trigger element.
+                    ignoredFocusElements: [e.currentTarget],
+                },
+            );
+        } else {
+            flatpickr.flatpickr_instance?.close();
+        }
+    });
+
+    $("#compose").on("click", ".markdown_preview", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        // Disable unneeded compose_control_buttons as we don't
+        // need them in preview mode.
+        $("#compose").addClass("preview_mode");
+        $("#compose .preview_mode_disabled .compose_control_button").attr("tabindex", -1);
+
+        const content = $("#compose-textarea").val();
+        $("#compose-textarea").hide();
+        $("#compose .markdown_preview").hide();
+        $("#compose .undo_markdown_preview").show();
+        $("#compose .undo_markdown_preview").trigger("focus");
+        $("#compose .preview_message_area").show();
+
+        compose.render_and_show_preview(
+            $("#compose .markdown_preview_spinner"),
+            $("#compose .preview_content"),
+            content,
+        );
+    });
+
+    $("#compose").on("click", ".undo_markdown_preview", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        compose.clear_preview_area();
+    });
+
+    $("#compose").on("click", ".expand_composebox_button", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        compose_ui.make_compose_box_full_size();
+    });
+
+    $("#compose").on("click", ".narrow_to_compose_recipients", (e) => {
+        e.preventDefault();
+        narrow.to_compose_target();
+    });
+
+    $("#compose").on("click", ".collapse_composebox_button", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        compose_ui.make_compose_box_original_size();
+    });
+
+    $("#compose-textarea").on("focus", () => {
+        compose_recipient.update_placeholder_text();
+    });
+
+    $("#stream_message_recipient_topic").on("focus", () => {
+        compose_recipient.update_placeholder_text();
+    });
+
+    $("#stream_message_recipient_topic").on("input", () => {
+        compose_recipient.update_placeholder_text();
+    });
+
+    $("body").on("click", ".formatting_button", (e) => {
+        const $compose_click_target = $(compose_ui.get_compose_click_target(e));
+        const $textarea = $compose_click_target.closest("form").find("textarea");
+        const format_type = $(e.target).attr("data-format-type");
+        compose_ui.format_text($textarea, format_type);
+        $textarea.trigger("focus");
+        e.preventDefault();
+        e.stopPropagation();
+    });
+
+    if (page_params.narrow !== undefined) {
+        if (page_params.narrow_topic !== undefined) {
+            compose_actions.start("stream", {topic: page_params.narrow_topic});
+        } else {
+            compose_actions.start("stream", {});
+        }
+    }
+}
diff --git a/web/src/ui_init.js b/web/src/ui_init.js
index 9e90ccef40..da14748c60 100644
--- a/web/src/ui_init.js
+++ b/web/src/ui_init.js
@@ -26,6 +26,7 @@ import * as compose_closed_ui from "./compose_closed_ui";
 import * as compose_pm_pill from "./compose_pm_pill";
 import * as compose_popovers from "./compose_popovers";
 import * as compose_recipient from "./compose_recipient";
+import * as compose_setup from "./compose_setup";
 import * as compose_textarea from "./compose_textarea";
 import * as compose_tooltips from "./compose_tooltips";
 import * as composebox_typeahead from "./composebox_typeahead";
@@ -646,8 +647,8 @@ export function initialize_everything() {
         playground_data: page_params.realm_playgrounds,
         pygments_comparator_func: typeahead_helper.compare_language,
     });
-    compose.initialize();
-    // Typeahead must be initialized after compose.initialize()
+    compose_setup.initialize();
+    // Typeahead must be initialized after compose_setup.initialize()
     composebox_typeahead.initialize({
         on_enter_send: compose.finish,
     });
diff --git a/web/tests/compose.test.js b/web/tests/compose.test.js
index e14f90d967..0195f2a679 100644
--- a/web/tests/compose.test.js
+++ b/web/tests/compose.test.js
@@ -56,6 +56,7 @@ const compose_closed_ui = zrequire("compose_closed_ui");
 const compose_recipient = zrequire("compose_recipient");
 const compose_state = zrequire("compose_state");
 const compose = zrequire("compose");
+const compose_setup = zrequire("compose_setup");
 const echo = zrequire("echo");
 const people = zrequire("people");
 const stream_data = zrequire("stream_data");
@@ -124,7 +125,7 @@ function initialize_handlers({override}) {
     override(page_params, "realm_video_chat_provider", 0);
     override(upload, "feature_check", () => {});
     override(resize, "watch_manual_resize", () => {});
-    compose.initialize();
+    compose_setup.initialize();
 }
 
 test_ui("send_message_success", ({override_rewire}) => {
@@ -445,7 +446,7 @@ test_ui("initialize", ({override}) => {
     });
     override(upload, "feature_check", () => {});
 
-    compose.initialize();
+    compose_setup.initialize();
 
     assert.ok(resize_watch_manual_resize_checked);
 
@@ -460,7 +461,7 @@ test_ui("initialize", ({override}) => {
         reset_jquery();
         set_up_compose_start_mock({});
 
-        compose.initialize();
+        compose_setup.initialize();
 
         assert.ok(compose_actions_start_checked);
     })();
@@ -471,16 +472,16 @@ test_ui("initialize", ({override}) => {
         reset_jquery();
         set_up_compose_start_mock({topic: "testing"});
 
-        compose.initialize();
+        compose_setup.initialize();
 
         assert.ok(compose_actions_start_checked);
     })();
 
     (function test_abort_xhr() {
         reset_jquery();
-        compose.initialize();
+        compose_setup.initialize();
 
-        compose.abort_xhr();
+        compose_setup.abort_xhr();
 
         assert.equal($("#compose-send-button").attr(), undefined);
         assert.ok(uppy_cancel_all_called);
diff --git a/web/tests/compose_actions.test.js b/web/tests/compose_actions.test.js
index 18c0c37750..130b66bb8f 100644
--- a/web/tests/compose_actions.test.js
+++ b/web/tests/compose_actions.test.js
@@ -64,7 +64,7 @@ mock_esm("../src/resize", {
 
 const people = zrequire("people");
 
-const compose = zrequire("compose");
+const compose_setup = zrequire("compose_setup");
 const compose_state = zrequire("compose_state");
 const compose_actions = zrequire("compose_actions");
 const message_lists = zrequire("message_lists");
@@ -224,11 +224,11 @@ test("start", ({override, override_rewire, mock_template}) => {
     };
 
     let abort_xhr_called = false;
-    override_rewire(compose, "abort_xhr", () => {
+    override_rewire(compose_setup, "abort_xhr", () => {
         abort_xhr_called = true;
     });
 
-    compose_actions.register_compose_cancel_hook(compose.abort_xhr);
+    compose_actions.register_compose_cancel_hook(compose_setup.abort_xhr);
     $("#compose-textarea").set_height(50);
 
     assert_hidden("#compose_controls");
diff --git a/web/tests/compose_video.test.js b/web/tests/compose_video.test.js
index 4a3d5b2756..195fa388ef 100644
--- a/web/tests/compose_video.test.js
+++ b/web/tests/compose_video.test.js
@@ -27,7 +27,8 @@ set_global(
 );
 
 const server_events_dispatch = zrequire("server_events_dispatch");
-const compose = zrequire("compose");
+const compose_setup = zrequire("compose_setup");
+
 function stub_out_video_calls() {
     const $elem = $("#below-compose-content .video_link");
     $elem.toggle = (show) => {
@@ -73,7 +74,7 @@ test("videos", ({override}) => {
 
     stub_out_video_calls();
 
-    compose.initialize();
+    compose_setup.initialize();
 
     (function test_no_provider_video_link_compose_clicked() {
         const $textarea = $.create("target-stub");
@@ -249,7 +250,7 @@ test("test_video_chat_button_toggle disabled", ({override}) => {
     override(upload, "feature_check", () => {});
 
     page_params.realm_video_chat_provider = realm_available_video_chat_providers.disabled.id;
-    compose.initialize();
+    compose_setup.initialize();
     assert.equal($("#below-compose-content .video_link").visible(), false);
 });
 
@@ -258,7 +259,7 @@ test("test_video_chat_button_toggle no url", ({override}) => {
 
     page_params.realm_video_chat_provider = realm_available_video_chat_providers.jitsi_meet.id;
     page_params.jitsi_server_url = null;
-    compose.initialize();
+    compose_setup.initialize();
     assert.equal($("#below-compose-content .video_link").visible(), false);
 });
 
@@ -267,6 +268,6 @@ test("test_video_chat_button_toggle enabled", ({override}) => {
 
     page_params.realm_video_chat_provider = realm_available_video_chat_providers.jitsi_meet.id;
     page_params.realm_jitsi_server_url = "https://meet.jit.si";
-    compose.initialize();
+    compose_setup.initialize();
     assert.equal($("#below-compose-content .video_link").visible(), true);
 });