diff --git a/.eslintrc.js b/.eslintrc.js
index 0782ae8893..0c55bc1e06 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -127,6 +127,7 @@ const config = {
     'no-constant-binary-expression': 'error',
     'no-constructor-return': 'error',
     'no-self-compare': 'error',
+    eqeqeq: ['error', 'always', { null: 'ignore' }],
     'react/prop-types': 'off',
     'react/jsx-no-useless-fragment': 'error',
     '@typescript-eslint/consistent-type-imports': 'error',
diff --git a/packages/backend/server/src/modules/doc/manager.ts b/packages/backend/server/src/modules/doc/manager.ts
index e531f6057e..a31bc1a841 100644
--- a/packages/backend/server/src/modules/doc/manager.ts
+++ b/packages/backend/server/src/modules/doc/manager.ts
@@ -42,7 +42,7 @@ function compare(yBinary: Buffer, jwstBinary: Buffer, strict = false): boolean {
 
 function isEmptyBuffer(buf: Buffer): boolean {
   return (
-    buf.length == 0 ||
+    buf.length === 0 ||
     // 0x0000
     (buf.length === 2 && buf[0] === 0 && buf[1] === 0)
   );
diff --git a/packages/common/infra/src/blocksuite/migration/subdoc.ts b/packages/common/infra/src/blocksuite/migration/subdoc.ts
index c8acf278cb..da77756cc2 100644
--- a/packages/common/infra/src/blocksuite/migration/subdoc.ts
+++ b/packages/common/infra/src/blocksuite/migration/subdoc.ts
@@ -50,7 +50,7 @@ function migrateDatabase(data: YMap<unknown>) {
     update: (cell: { id: string; value: unknown }) => void
   ) => {
     Object.values(cells).forEach(row => {
-      if (row[id] != null) {
+      if (row[id] !== null && row[id] !== undefined) {
         update(row[id]);
       }
     });
diff --git a/packages/frontend/component/src/components/page-list/filter/logical/typesystem.ts b/packages/frontend/component/src/components/page-list/filter/logical/typesystem.ts
index 4b0e0a8533..5458e02e2b 100644
--- a/packages/frontend/component/src/components/page-list/filter/logical/typesystem.ts
+++ b/packages/frontend/component/src/components/page-list/filter/logical/typesystem.ts
@@ -195,7 +195,7 @@ export class Typesystem {
   ): boolean {
     if (superType.type === 'typeRef') {
       // TODO both are ref
-      if (context && sub.type != 'typeRef') {
+      if (context && sub.type !== 'typeRef') {
         context[superType.name] = sub;
       }
       // TODO bound
diff --git a/packages/frontend/component/src/components/page-list/filter/vars.tsx b/packages/frontend/component/src/components/page-list/filter/vars.tsx
index 9b3c5fc2e9..bf4af661af 100644
--- a/packages/frontend/component/src/components/page-list/filter/vars.tsx
+++ b/packages/frontend/component/src/components/page-list/filter/vars.tsx
@@ -141,7 +141,7 @@ filterMatcher.register(
     name: 'is',
     defaultArgs: () => [true],
     impl: (value, target) => {
-      return value == target;
+      return value === target;
     },
   }
 );
@@ -209,7 +209,7 @@ filterMatcher.register(
     defaultArgs: () => [],
     impl: tags => {
       const safeTags = safeArray(tags);
-      return safeTags.length == 0;
+      return safeTags.length === 0;
     },
   }
 );
diff --git a/packages/frontend/component/src/components/page-list/utils.tsx b/packages/frontend/component/src/components/page-list/utils.tsx
index 8acf0002eb..1c33f2fd1f 100644
--- a/packages/frontend/component/src/components/page-list/utils.tsx
+++ b/packages/frontend/component/src/components/page-list/utils.tsx
@@ -10,9 +10,9 @@ import * as styles from './page-list.css';
 export function isToday(date: Date): boolean {
   const today = new Date();
   return (
-    date.getDate() == today.getDate() &&
-    date.getMonth() == today.getMonth() &&
-    date.getFullYear() == today.getFullYear()
+    date.getDate() === today.getDate() &&
+    date.getMonth() === today.getMonth() &&
+    date.getFullYear() === today.getFullYear()
   );
 }
 
diff --git a/packages/frontend/core/src/components/affine/setting-modal/general-setting/plans/plan-card.tsx b/packages/frontend/core/src/components/affine/setting-modal/general-setting/plans/plan-card.tsx
index 16074b71dc..f8f415ee69 100644
--- a/packages/frontend/core/src/components/affine/setting-modal/general-setting/plans/plan-card.tsx
+++ b/packages/frontend/core/src/components/affine/setting-modal/general-setting/plans/plan-card.tsx
@@ -179,7 +179,7 @@ export const PlanCard = (props: PlanCardProps) => {
         {detail.benefits.map((content, i) => (
           <div key={i} className={styles.planBenefit}>
             <div className={styles.planBenefitIcon}>
-              {detail.type == 'dynamic' ? (
+              {detail.type === 'dynamic' ? (
                 <BulledListIcon color="var(--affine-processing-color)" />
               ) : (
                 <DoneIcon
diff --git a/packages/frontend/core/src/components/pure/workspace-slider-bar/collections/collections-list.tsx b/packages/frontend/core/src/components/pure/workspace-slider-bar/collections/collections-list.tsx
index c369cdd551..1dfa9edf4b 100644
--- a/packages/frontend/core/src/components/pure/workspace-slider-bar/collections/collections-list.tsx
+++ b/packages/frontend/core/src/components/pure/workspace-slider-bar/collections/collections-list.tsx
@@ -85,7 +85,7 @@ const CollectionRenderer = ({
     async (id: string) => {
       await setting.updateCollection({
         ...collection,
-        allowList: collection.allowList?.filter(v => v != id),
+        allowList: collection.allowList?.filter(v => v !== id),
       });
     },
     [collection, setting]
diff --git a/packages/frontend/core/src/layouts/workspace-layout.tsx b/packages/frontend/core/src/layouts/workspace-layout.tsx
index 12bbf066a6..3c4a8d3498 100644
--- a/packages/frontend/core/src/layouts/workspace-layout.tsx
+++ b/packages/frontend/core/src/layouts/workspace-layout.tsx
@@ -194,7 +194,8 @@ export const WorkspaceLayoutInner = ({
     const blockVersions = meta.get('blockVersions');
     if (
       !(blockVersions instanceof YMap) &&
-      blockVersions != null &&
+      blockVersions !== null &&
+      blockVersions !== undefined &&
       typeof blockVersions === 'object'
     ) {
       meta.set(
diff --git a/packages/frontend/electron/src/main/updater/custom-github-provider.ts b/packages/frontend/electron/src/main/updater/custom-github-provider.ts
index 55bf60102f..9615b3c550 100644
--- a/packages/frontend/electron/src/main/updater/custom-github-provider.ts
+++ b/packages/frontend/electron/src/main/updater/custom-github-provider.ts
@@ -105,7 +105,7 @@ export class CustomGitHubProvider extends BaseGitHubProvider<GithubUpdateInfo> {
       );
     }
 
-    if (tag == null) {
+    if (tag === null || tag === undefined) {
       throw newError(
         `No published versions on GitHub`,
         'ERR_UPDATER_NO_PUBLISHED_VERSIONS'
@@ -154,7 +154,7 @@ export class CustomGitHubProvider extends BaseGitHubProvider<GithubUpdateInfo> {
     }
 
     const result = parseUpdateInfo(rawData, channelFile, channelFileUrl);
-    if (result.releaseName == null) {
+    if (result.releaseName === null) {
       result.releaseName = latestRelease.elementValueOrEmpty('title');
     }
 
diff --git a/packages/frontend/workspace/src/providers/sync/engine.ts b/packages/frontend/workspace/src/providers/sync/engine.ts
index 120dc97739..85221587de 100644
--- a/packages/frontend/workspace/src/providers/sync/engine.ts
+++ b/packages/frontend/workspace/src/providers/sync/engine.ts
@@ -186,13 +186,13 @@ export class SyncEngine {
   }
 
   async waitForSynced(abort?: AbortSignal) {
-    if (this.status.step == SyncEngineStep.Synced) {
+    if (this.status.step === SyncEngineStep.Synced) {
       return;
     } else {
       return Promise.race([
         new Promise<void>(resolve => {
           this.onStatusChange.on(status => {
-            if (status.step == SyncEngineStep.Synced) {
+            if (status.step === SyncEngineStep.Synced) {
               resolve();
             }
           });
diff --git a/tests/affine-local/e2e/quick-search.spec.ts b/tests/affine-local/e2e/quick-search.spec.ts
index cb5ceb836b..bc53c0cd9e 100644
--- a/tests/affine-local/e2e/quick-search.spec.ts
+++ b/tests/affine-local/e2e/quick-search.spec.ts
@@ -65,7 +65,7 @@ async function waitForScrollToFinish(page: Page) {
       let lastScrollTop: number;
       const interval = setInterval(() => {
         const { scrollTop } = document.documentElement;
-        if (scrollTop != lastScrollTop) {
+        if (scrollTop !== lastScrollTop) {
           lastScrollTop = scrollTop;
         } else {
           clearInterval(interval);