diff --git a/packages/frontend-embed/src/theme.ts b/packages/frontend-embed/src/theme.ts
index 680ab80167..c9b1c0d0c6 100644
--- a/packages/frontend-embed/src/theme.ts
+++ b/packages/frontend-embed/src/theme.ts
@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+// TODO: (可能な部分を)sharedに抽出して frontend と共通化
+
 import tinycolor from 'tinycolor2';
 import lightTheme from '@@/themes/_light.json5';
 import darkTheme from '@@/themes/_dark.json5';
diff --git a/packages/frontend/src/theme.ts b/packages/frontend/src/theme.ts
index b715426917..4d03b1d0e9 100644
--- a/packages/frontend/src/theme.ts
+++ b/packages/frontend/src/theme.ts
@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+// TODO: (可能な部分を)sharedに抽出して frontend-embed と共通化
+
 import { ref, nextTick } from 'vue';
 import tinycolor from 'tinycolor2';
 import lightTheme from '@@/themes/_light.json5';
@@ -166,16 +168,21 @@ export function compile(theme: Theme): Record<string, string> {
 			return getColor(theme.props[val]);
 		} else if (val[0] === ':') { // func
 			const parts = val.split('<');
-			const func = parts.shift().substring(1);
-			const arg = parseFloat(parts.shift());
-			const color = getColor(parts.join('<'));
+			const funcTxt = parts.shift();
+			const argTxt = parts.shift();
 
-			switch (func) {
-				case 'darken': return color.darken(arg);
-				case 'lighten': return color.lighten(arg);
-				case 'alpha': return color.setAlpha(arg);
-				case 'hue': return color.spin(arg);
-				case 'saturate': return color.saturate(arg);
+			if (funcTxt && argTxt) {
+				const func = funcTxt.substring(1);
+				const arg = parseFloat(argTxt);
+				const color = getColor(parts.join('<'));
+
+				switch (func) {
+					case 'darken': return color.darken(arg);
+					case 'lighten': return color.lighten(arg);
+					case 'alpha': return color.setAlpha(arg);
+					case 'hue': return color.spin(arg);
+					case 'saturate': return color.saturate(arg);
+				}
 			}
 		}
 
diff --git a/packages/frontend/src/utility/popup-position.ts b/packages/frontend/src/utility/popup-position.ts
index 676dfb7507..0ba0d8e897 100644
--- a/packages/frontend/src/utility/popup-position.ts
+++ b/packages/frontend/src/utility/popup-position.ts
@@ -29,8 +29,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 			left = rect.left + window.scrollX + (props.anchorElement.offsetWidth / 2);
 			top = (rect.top + window.scrollY - contentHeight) - props.innerMargin;
 		} else {
-			left = props.x;
-			top = (props.y - contentHeight) - props.innerMargin;
+			left = props.x!;
+			top = (props.y! - contentHeight) - props.innerMargin;
 		}
 
 		left -= (el.offsetWidth / 2);
@@ -54,8 +54,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 			left = rect.left + window.scrollX + (props.anchorElement.offsetWidth / 2);
 			top = (rect.top + window.scrollY + props.anchorElement.offsetHeight) + props.innerMargin;
 		} else {
-			left = props.x;
-			top = (props.y) + props.innerMargin;
+			left = props.x!;
+			top = (props.y!) + props.innerMargin;
 		}
 
 		left -= (el.offsetWidth / 2);
@@ -79,8 +79,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 			left = (rect.left + window.scrollX - contentWidth) - props.innerMargin;
 			top = rect.top + window.scrollY + (props.anchorElement.offsetHeight / 2);
 		} else {
-			left = (props.x - contentWidth) - props.innerMargin;
-			top = props.y;
+			left = (props.x! - contentWidth) - props.innerMargin;
+			top = props.y!;
 		}
 
 		top -= (el.offsetHeight / 2);
@@ -97,8 +97,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 	};
 
 	const calcPosWhenRight = () => {
-		let left: number;
-		let top: number;
+		let left = 0; // TSを黙らすためとりあえず初期値を0に
+		let top = 0; // TSを黙らすためとりあえず初期値を0に
 
 		if (props.anchorElement) {
 			left = (rect.left + props.anchorElement.offsetWidth + window.scrollX) + props.innerMargin;
@@ -113,8 +113,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 				top -= (el.offsetHeight / 2);
 			}
 		} else {
-			left = props.x + props.innerMargin;
-			top = props.y;
+			left = props.x! + props.innerMargin;
+			top = props.y!;
 			top -= (el.offsetHeight / 2);
 		}