diff --git a/packages/frontend-embed/src/components/EmReactionsViewer.vue b/packages/frontend-embed/src/components/EmReactionsViewer.vue
index 014dd1c935..f5aa6bdc3f 100644
--- a/packages/frontend-embed/src/components/EmReactionsViewer.vue
+++ b/packages/frontend-embed/src/components/EmReactionsViewer.vue
@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import * as Misskey from 'misskey-js';
-import { inject, watch, ref } from 'vue';
+import { watch, ref } from 'vue';
 import XReaction from '@/components/EmReactionsViewer.reaction.vue';
 
 const props = withDefaults(defineProps<{
@@ -22,12 +22,6 @@ const props = withDefaults(defineProps<{
 	maxNumber: Infinity,
 });
 
-const mock = inject<boolean>('mock', false);
-
-const emit = defineEmits<{
-	(ev: 'mockUpdateMyReaction', emoji: string, delta: number): void;
-}>();
-
 const initialReactions = new Set(Object.keys(props.note.reactions));
 
 const reactions = ref<[string, number][]>([]);
@@ -38,12 +32,8 @@ if (props.note.myReaction && !Object.keys(reactions.value).includes(props.note.m
 }
 
 function onMockToggleReaction(emoji: string, count: number) {
-	if (!mock) return;
-
 	const i = reactions.value.findIndex((item) => item[0] === emoji);
 	if (i < 0) return;
-
-	emit('mockUpdateMyReaction', emoji, (count - reactions.value[i][1]));
 }
 
 watch([() => props.note.reactions, () => props.maxNumber], ([newSource, maxNumber]) => {
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index a22ad346bf..e08f5e6163 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -223,6 +223,7 @@ import { focusPrev, focusNext } from '@/utility/focus.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { prefer } from '@/preferences.js';
 import { getPluginHandlers } from '@/plugin.js';
+import { DI } from '@/di.js';
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -233,7 +234,7 @@ const props = withDefaults(defineProps<{
 	mock: false,
 });
 
-provide('mock', props.mock);
+provide(DI.mock, props.mock);
 
 const emit = defineEmits<{
 	(ev: 'reaction', emoji: string): void;
diff --git a/packages/frontend/src/components/MkNoteHeader.vue b/packages/frontend/src/components/MkNoteHeader.vue
index 8e5adec1a3..ea115c2cd8 100644
--- a/packages/frontend/src/components/MkNoteHeader.vue
+++ b/packages/frontend/src/components/MkNoteHeader.vue
@@ -40,12 +40,13 @@ import * as Misskey from 'misskey-js';
 import { i18n } from '@/i18n.js';
 import { notePage } from '@/filters/note.js';
 import { userPage } from '@/filters/user.js';
+import { DI } from '@/di.js';
 
 defineProps<{
 	note: Misskey.entities.Note;
 }>();
 
-const mock = inject<boolean>('mock', false);
+const mock = inject(DI.mock, false);
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index c6958eea77..d57300f647 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -138,6 +138,7 @@ import { emojiPicker } from '@/utility/emoji-picker.js';
 import { mfmFunctionPicker } from '@/utility/mfm-function-picker.js';
 import { prefer } from '@/preferences.js';
 import { getPluginHandlers } from '@/plugin.js';
+import { DI } from '@/di.js';
 
 const $i = signinRequired();
 
@@ -155,7 +156,7 @@ const props = withDefaults(defineProps<PostFormProps & {
 	initialLocalOnly: undefined,
 });
 
-provide('mock', props.mock);
+provide(DI.mock, props.mock);
 
 const emit = defineEmits<{
 	(ev: 'posted'): void;
diff --git a/packages/frontend/src/components/MkPostFormAttaches.vue b/packages/frontend/src/components/MkPostFormAttaches.vue
index 3ce0c4957b..c4926be53a 100644
--- a/packages/frontend/src/components/MkPostFormAttaches.vue
+++ b/packages/frontend/src/components/MkPostFormAttaches.vue
@@ -42,6 +42,7 @@ import * as os from '@/os.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
 import { i18n } from '@/i18n.js';
 import { prefer } from '@/preferences.js';
+import { DI } from '@/di.js';
 
 const Sortable = defineAsyncComponent(() => import('vuedraggable').then(x => x.default));
 
@@ -50,7 +51,7 @@ const props = defineProps<{
 	detachMediaFn?: (id: string) => void;
 }>();
 
-const mock = inject<boolean>('mock', false);
+const mock = inject(DI.mock, false);
 
 const emit = defineEmits<{
 	(ev: 'update:modelValue', value: Misskey.entities.DriveFile[]): void;
diff --git a/packages/frontend/src/components/MkReactionsViewer.reaction.vue b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
index 12a066c710..736bf87508 100644
--- a/packages/frontend/src/components/MkReactionsViewer.reaction.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
@@ -35,6 +35,7 @@ import * as sound from '@/utility/sound.js';
 import { checkReactionPermissions } from '@/utility/check-reaction-permissions.js';
 import { customEmojisMap } from '@/custom-emojis.js';
 import { prefer } from '@/preferences.js';
+import { DI } from '@/di.js';
 
 const props = defineProps<{
 	reaction: string;
@@ -43,7 +44,7 @@ const props = defineProps<{
 	note: Misskey.entities.Note;
 }>();
 
-const mock = inject<boolean>('mock', false);
+const mock = inject(DI.mock, false);
 
 const emit = defineEmits<{
 	(ev: 'reactionToggled', emoji: string, newCount: number): void;
diff --git a/packages/frontend/src/components/MkReactionsViewer.vue b/packages/frontend/src/components/MkReactionsViewer.vue
index bb60db8d34..ac4f4acdbb 100644
--- a/packages/frontend/src/components/MkReactionsViewer.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.vue
@@ -22,6 +22,7 @@ import * as Misskey from 'misskey-js';
 import { inject, watch, ref } from 'vue';
 import XReaction from '@/components/MkReactionsViewer.reaction.vue';
 import { prefer } from '@/preferences.js';
+import { DI } from '@/di.js';
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -30,7 +31,7 @@ const props = withDefaults(defineProps<{
 	maxNumber: Infinity,
 });
 
-const mock = inject<boolean>('mock', false);
+const mock = inject(DI.mock, false);
 
 const emit = defineEmits<{
 	(ev: 'mockUpdateMyReaction', emoji: string, delta: number): void;
diff --git a/packages/frontend/src/di.ts b/packages/frontend/src/di.ts
index 538f85df2d..192242984c 100644
--- a/packages/frontend/src/di.ts
+++ b/packages/frontend/src/di.ts
@@ -9,4 +9,5 @@ import type { IRouter } from '@/nirax.js';
 export const DI = {
 	routerCurrentDepth: Symbol() as InjectionKey<number>,
 	router: Symbol() as InjectionKey<IRouter>,
+	mock: Symbol() as InjectionKey<boolean>,
 };
diff --git a/packages/frontend/src/router/supplier.ts b/packages/frontend/src/router/supplier.ts
index 191dd49ebb..bdeb47cfd8 100644
--- a/packages/frontend/src/router/supplier.ts
+++ b/packages/frontend/src/router/supplier.ts
@@ -5,7 +5,6 @@
 
 import { inject } from 'vue';
 import type { IRouter } from '@/nirax.js';
-import { Router } from '@/nirax.js';
 import { mainRouter } from '@/router/main.js';
 import { DI } from '@/di.js';
 
@@ -14,7 +13,7 @@ import { DI } from '@/di.js';
  * あらかじめ{@link setupRouter}を実行しておく必要がある（{@link provide}により{@link IRouter}のインスタンスを注入可能であるならばこの限りではない）
  */
 export function useRouter(): IRouter {
-	return inject<Router | null>(DI.router, null) ?? mainRouter;
+	return inject(DI.router, null) ?? mainRouter;
 }
 
 /**