diff --git a/ui/@types/lichess/index.d.ts b/ui/@types/lichess/index.d.ts
index 3eabd247fb..67322e7ff3 100644
--- a/ui/@types/lichess/index.d.ts
+++ b/ui/@types/lichess/index.d.ts
@@ -1,11 +1,9 @@
 interface Lichess {
   load: Promise<unknown>; // window.onload promise
-  // components
   info: any;
   requestIdleCallback(f: () => void): void;
   hasTouchEvents: boolean;
   sri: string;
-  isCol1(): boolean;
   storage: LichessStorageHelper;
   tempStorage: LichessStorageHelper;
   once(key: string, mod?: 'always'): boolean;
diff --git a/ui/analyse/src/treeView/treeView.ts b/ui/analyse/src/treeView/treeView.ts
index 495dbc1ba7..e6cf8ebfc7 100644
--- a/ui/analyse/src/treeView/treeView.ts
+++ b/ui/analyse/src/treeView/treeView.ts
@@ -12,6 +12,7 @@ import column from './columnView';
 import inline from './inlineView';
 import { empty, defined } from 'common';
 import throttle from 'common/throttle';
+import isCol1 from 'common/isCol1';
 import { storedProp, StoredProp } from 'common/storage';
 
 export interface Ctx {
@@ -68,7 +69,7 @@ export function ctrl(initialValue: TreeViewKey = 'column'): TreeView {
 
 // entry point, dispatching to selected view
 export function render(ctrl: AnalyseCtrl, concealOf?: ConcealOf): VNode {
-  return (ctrl.treeView.inline() || window.lichess.isCol1()) ? inline(ctrl) : column(ctrl, concealOf);
+  return (ctrl.treeView.inline() || isCol1()) ? inline(ctrl) : column(ctrl, concealOf);
 }
 
 export function nodeClasses(ctx: Ctx, path: Tree.Path): NodeClasses {
diff --git a/ui/site/src/component/is-col1.ts b/ui/common/src/isCol1.ts
similarity index 93%
rename from ui/site/src/component/is-col1.ts
rename to ui/common/src/isCol1.ts
index 0608b5a336..9ce28bb4af 100644
--- a/ui/site/src/component/is-col1.ts
+++ b/ui/common/src/isCol1.ts
@@ -1,6 +1,6 @@
 let cache: 'init' | 'rec' | boolean = 'init';
 
-export function isCol1() {
+export default function(): boolean {
   if (typeof cache == 'string') {
     if (cache == 'init') { // only once
       window.addEventListener('resize', () => {
diff --git a/ui/common/tsconfig.json b/ui/common/tsconfig.json
index f6a53d4f13..4bc4b6d574 100644
--- a/ui/common/tsconfig.json
+++ b/ui/common/tsconfig.json
@@ -3,6 +3,6 @@
   "include": ["src/*.ts"],
   "exclude": [],
   "compilerOptions": {
-    "outDir": "./",
+    "outDir": "./"
   }
 }
diff --git a/ui/round/src/view/replay.ts b/ui/round/src/view/replay.ts
index b9fe08b054..17acf8e3fb 100644
--- a/ui/round/src/view/replay.ts
+++ b/ui/round/src/view/replay.ts
@@ -2,6 +2,7 @@ import { h } from 'snabbdom'
 import { VNode } from 'snabbdom/vnode'
 import * as round from '../round';
 import throttle from 'common/throttle';
+import isCol1 from 'common/isCol1';
 import * as game from 'game';
 import * as status from 'game/status';
 import { game as gameRoute } from 'game/router';
@@ -20,13 +21,13 @@ const autoScroll = throttle(100, (movesEl: HTMLElement, ctrl: RoundController) =
     else if (ctrl.ply == round.lastPly(ctrl.data)) st = scrollMax;
     else {
       const plyEl = movesEl.querySelector('.' + activeClass) as HTMLElement | undefined;
-      if (plyEl) st = window.lichess.isCol1() ?
+      if (plyEl) st = isCol1() ?
         plyEl.offsetLeft - movesEl.offsetWidth / 2 + plyEl.offsetWidth / 2 :
         plyEl.offsetTop - movesEl.offsetHeight / 2 + plyEl.offsetHeight / 2;
     }
     if (typeof st == 'number') {
       if (st == scrollMax) movesEl.scrollLeft = movesEl.scrollTop = st;
-      else if (window.lichess.isCol1()) movesEl.scrollLeft = st;
+      else if (isCol1()) movesEl.scrollLeft = st;
       else movesEl.scrollTop = st;
     }
   })
@@ -185,7 +186,6 @@ function col1Button(ctrl: RoundController, dir: number, icon: string, disabled:
 
 export function render(ctrl: RoundController): VNode | undefined {
   const d = ctrl.data,
-    col1 = window.lichess.isCol1(),
     moves = ctrl.replayEnabledByPref() && h(movesTag, {
       hook: util.onInsert(el => {
         el.addEventListener('mousedown', e => {
@@ -208,7 +208,7 @@ export function render(ctrl: RoundController): VNode | undefined {
   return ctrl.nvui ? undefined : h(rmovesTag, [
     renderButtons(ctrl),
     initMessage(d, ctrl.trans.noarg) || (moves ? (
-      col1 ? h('div.col1-moves', [
+      isCol1() ? h('div.col1-moves', [
         col1Button(ctrl, -1, 'Y', ctrl.ply == round.firstPly(d)),
         moves,
         col1Button(ctrl, 1, 'X', ctrl.ply == round.lastPly(d))
diff --git a/ui/site/src/site.lichess.globals.ts b/ui/site/src/site.lichess.globals.ts
index 9d0be1f9f6..b43ab15f84 100644
--- a/ui/site/src/site.lichess.globals.ts
+++ b/ui/site/src/site.lichess.globals.ts
@@ -5,7 +5,6 @@ import once from './component/once';
 import hasTouchEvents from './component/touchEvents';
 import spinnerHtml from './component/spinner';
 import sri from './component/sri';
-import { isCol1 } from "./component/is-col1";
 import { storage, tempStorage } from "./component/storage";
 import powertip from "./component/powertip";
 import { assetUrl, soundUrl, loadCss, loadCssPath, jsModule, loadScript, hopscotch, slider } from "./component/assets";
@@ -30,7 +29,6 @@ export default function() {
   l.requestIdleCallback = requestIdleCallback;
   l.hasTouchEvents = hasTouchEvents;
   l.sri = sri;
-  l.isCol1 = isCol1;
   l.storage = storage;
   l.tempStorage = tempStorage;
   l.once = once;