diff --git a/.github/workflows/tests-e2e.yml b/.github/workflows/tests-e2e.yml
index 1ae61a878c01..dbd9012baf5c 100644
--- a/.github/workflows/tests-e2e.yml
+++ b/.github/workflows/tests-e2e.yml
@@ -158,18 +158,28 @@ jobs:
         working-directory: ../test-website
         env:
           E2E_TEST: true
+
       - name: TypeCheck website
         # TODO: there're some lingering issues with PnP + tsc. Enable tsc in PnP later.
         if: matrix.variant == '-st' && matrix.nodeLinker != 'pnp'
         working-directory: ../test-website
         run: yarn typecheck
+
       - name: TypeCheck website - min version - v5.1
         # TODO: there're some lingering issues with PnP + tsc. Enable tsc in PnP later.
         if: matrix.variant == '-st' && matrix.nodeLinker != 'pnp'
         working-directory: ../test-website
         run: |
           yarn add typescript@5.1.6 --exact
+
+          # Downgrade TS ignoreDeprecations option
+          node -e "const fs = require('fs'); const f = 'tsconfig.json'; fs.writeFileSync(f, fs.readFileSync(f,'utf8').replace('\"ignoreDeprecations\": \"6.0\"', '\"ignoreDeprecations\": \"5.0\"'))"
+
           yarn typecheck
+
+          # Restore TS ignoreDeprecations option
+          node -e "const fs = require('fs'); const f = 'tsconfig.json'; fs.writeFileSync(f, fs.readFileSync(f,'utf8').replace('\"ignoreDeprecations\": \"5.0\"', '\"ignoreDeprecations\": \"6.0\"'))"
+
       - name: TypeCheck website - max version - Latest
         # TODO: there're some lingering issues with PnP + tsc. Enable tsc in PnP later.
         if: matrix.variant == '-st' && matrix.nodeLinker != 'pnp'
diff --git a/.github/workflows/tests-windows.yml b/.github/workflows/tests-windows.yml
index 69d7a8b7f523..e766abd9cb78 100644
--- a/.github/workflows/tests-windows.yml
+++ b/.github/workflows/tests-windows.yml
@@ -61,18 +61,23 @@ jobs:
       - name: TypeCheck website
         # see https://github.com/facebook/docusaurus/pull/10486
         run: yarn workspace website typecheck
+
+      - name: TypeCheck website - max version - Latest
+        # For latest TS there are often lib check errors, so we disable it
+        # Details: https://github.com/facebook/docusaurus/pull/10486
+        run: |
+          yarn add typescript@latest --exact -D -W --ignore-scripts
+          yarn workspace website typecheck --project tsconfig.skipLibCheck.json
+
       - name: TypeCheck website - min version - v5.1
         run: |
           yarn add typescript@5.1.6 --exact -D -W --ignore-scripts
 
+          # Downgrade TS ignoreDeprecations option
+          node -e 'const fs = require("fs"); const f = "website/tsconfig.json"; fs.writeFileSync(f, fs.readFileSync(f, "utf8").replace(/"ignoreDeprecations"\s*:\s*"6\.0"/, "\"ignoreDeprecations\": \"5.0\""));'
+
           # DocSearch@4/ai@5 doesn't support TS 5.1 (with skipLibCheck=false)
           jq '.resolutions."@docsearch/react" = "^3.9.0"' package.json > package.json.tmp && mv -Force package.json.tmp package.json
           yarn add @docsearch/react@^3.9.0 --exact -D -W --ignore-scripts
 
           yarn workspace website typecheck
-      - name: TypeCheck website - max version - Latest
-        # For latest TS there are often lib check errors, so we disable it
-        # Details: https://github.com/facebook/docusaurus/pull/10486
-        run: |
-          yarn add typescript@latest --exact -D -W --ignore-scripts
-          yarn workspace website typecheck --project tsconfig.skipLibCheck.json
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 816fcee7b2b2..05e3f3c173f9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -58,15 +58,23 @@ jobs:
       - name: TypeCheck website
         # see https://github.com/facebook/docusaurus/pull/10486
         run: yarn workspace website typecheck
+
       - name: TypeCheck website - min version - v5.1
         run: |
           yarn add typescript@5.1.6 --exact -D -W --ignore-scripts
 
+          # Downgrade TS ignoreDeprecations option
+          node -e "const fs = require('fs'); const f = 'website/tsconfig.json'; fs.writeFileSync(f, fs.readFileSync(f,'utf8').replace('\"ignoreDeprecations\": \"6.0\"', '\"ignoreDeprecations\": \"5.0\"'))"
+
           # DocSearch@4/ai@5 doesn't support TS 5.1 (with skipLibCheck=false)
           jq '.resolutions."@docsearch/react" = "^3.9.0"' package.json > package.json.tmp && mv -f package.json.tmp package.json
           yarn add @docsearch/react@^3.9.0 --exact -D -W --ignore-scripts
 
           yarn workspace website typecheck
+
+          # Restore TS ignoreDeprecations option
+          node -e "const fs = require('fs'); const f = 'website/tsconfig.json'; fs.writeFileSync(f, fs.readFileSync(f,'utf8').replace('\"ignoreDeprecations\": \"5.0\"', '\"ignoreDeprecations\": \"6.0\"'))"
+
       - name: TypeCheck website - max version - Latest
         # For latest TS there are often lib check errors, so we disable it
         # Details: https://github.com/facebook/docusaurus/pull/10486
diff --git a/package.json b/package.json
index 885b9fc25850..90f0fa334570 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     "@types/fs-extra": "^9.0.13",
     "@types/jest": "^30.0.0",
     "@types/lodash": "^4.14.197",
-    "@types/node": "^18.16.19",
+    "@types/node": "^20.19.37",
     "@types/prompts": "^2.4.4",
     "@types/react": "^19.2.10",
     "@types/semver": "^7.5.0",
@@ -128,7 +128,7 @@
     "stylelint": "^14.16.1",
     "stylelint-config-prettier": "^9.0.5",
     "stylelint-config-standard": "^29.0.0",
-    "typescript": "~5.8.2"
+    "typescript": "~6.0.2"
   },
   "resolutions": {
     "**/pretty-format/react-is": "^19.2.4"
diff --git a/packages/create-docusaurus/templates/classic-typescript/package.json b/packages/create-docusaurus/templates/classic-typescript/package.json
index aa4d545ffeae..cc9ed3d5b874 100644
--- a/packages/create-docusaurus/templates/classic-typescript/package.json
+++ b/packages/create-docusaurus/templates/classic-typescript/package.json
@@ -29,7 +29,7 @@
     "@docusaurus/tsconfig": "3.9.2",
     "@docusaurus/types": "3.9.2",
     "@types/react": "^19.0.0",
-    "typescript": "~5.6.2"
+    "typescript": "~6.0.2"
   },
   "browserslist": {
     "production": [
diff --git a/packages/create-docusaurus/templates/classic-typescript/tsconfig.json b/packages/create-docusaurus/templates/classic-typescript/tsconfig.json
index aceae0dd36e4..405d777064cb 100644
--- a/packages/create-docusaurus/templates/classic-typescript/tsconfig.json
+++ b/packages/create-docusaurus/templates/classic-typescript/tsconfig.json
@@ -5,6 +5,7 @@
   "extends": "@docusaurus/tsconfig",
   "compilerOptions": {
     "baseUrl": ".",
+    "ignoreDeprecations": "6.0",
     "strict": true
   },
   "exclude": [".docusaurus", "build"]
diff --git a/packages/docusaurus-logger/src/perfLogger.ts b/packages/docusaurus-logger/src/perfLogger.ts
index 2bc94b7730e0..e5e5823afc70 100644
--- a/packages/docusaurus-logger/src/perfLogger.ts
+++ b/packages/docusaurus-logger/src/perfLogger.ts
@@ -4,7 +4,9 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
-import {AsyncLocalStorage} from 'async_hooks';
+
+import {AsyncLocalStorage} from 'node:async_hooks';
+import {type PerformanceMark} from 'node:perf_hooks';
 import logger from './logger';
 
 // For now this is a private env variable we use internally
diff --git a/packages/docusaurus-plugin-content-blog/tsconfig.client.json b/packages/docusaurus-plugin-content-blog/tsconfig.client.json
index be1294f32d10..ad1fa888de1e 100644
--- a/packages/docusaurus-plugin-content-blog/tsconfig.client.json
+++ b/packages/docusaurus-plugin-content-blog/tsconfig.client.json
@@ -1,5 +1,5 @@
 {
   "extends": "../../tsconfig.base.client.json",
   "include": ["src/client", "src/*.d.ts"],
-  "exclude": ["**/__tests__/**"]
+  "exclude": ["**/__tests__/**", "**/*.test.ts"]
 }
diff --git a/packages/docusaurus-plugin-content-blog/tsconfig.json b/packages/docusaurus-plugin-content-blog/tsconfig.json
index 8cec50ee1327..60dfa46f1b9f 100644
--- a/packages/docusaurus-plugin-content-blog/tsconfig.json
+++ b/packages/docusaurus-plugin-content-blog/tsconfig.json
@@ -5,5 +5,5 @@
     "noEmit": false
   },
   "include": ["src"],
-  "exclude": ["src/client", "**/__tests__/**"]
+  "exclude": ["src/client", "**/__tests__/**", "**/*.test.ts"]
 }
diff --git a/packages/docusaurus-plugin-content-docs/tsconfig.client.json b/packages/docusaurus-plugin-content-docs/tsconfig.client.json
index be1294f32d10..ad1fa888de1e 100644
--- a/packages/docusaurus-plugin-content-docs/tsconfig.client.json
+++ b/packages/docusaurus-plugin-content-docs/tsconfig.client.json
@@ -1,5 +1,5 @@
 {
   "extends": "../../tsconfig.base.client.json",
   "include": ["src/client", "src/*.d.ts"],
-  "exclude": ["**/__tests__/**"]
+  "exclude": ["**/__tests__/**", "**/*.test.ts"]
 }
diff --git a/packages/docusaurus-plugin-content-docs/tsconfig.json b/packages/docusaurus-plugin-content-docs/tsconfig.json
index 8cec50ee1327..60dfa46f1b9f 100644
--- a/packages/docusaurus-plugin-content-docs/tsconfig.json
+++ b/packages/docusaurus-plugin-content-docs/tsconfig.json
@@ -5,5 +5,5 @@
     "noEmit": false
   },
   "include": ["src"],
-  "exclude": ["src/client", "**/__tests__/**"]
+  "exclude": ["src/client", "**/__tests__/**", "**/*.test.ts"]
 }
diff --git a/packages/docusaurus-plugin-google-gtag/tsconfig.client.json b/packages/docusaurus-plugin-google-gtag/tsconfig.client.json
index 55a83c9a16f4..8ce90029c715 100644
--- a/packages/docusaurus-plugin-google-gtag/tsconfig.client.json
+++ b/packages/docusaurus-plugin-google-gtag/tsconfig.client.json
@@ -1,5 +1,8 @@
 {
   "extends": "../../tsconfig.base.client.json",
+  "compilerOptions": {
+    "types": ["gtag.js"]
+  },
   "include": ["src/gtag.ts", "src/*.d.ts"],
   "exclude": ["**/__tests__/**"]
 }
diff --git a/packages/docusaurus-plugin-pwa/tsconfig.worker.json b/packages/docusaurus-plugin-pwa/tsconfig.worker.json
index d649d9cfe6d7..7270da1d425e 100644
--- a/packages/docusaurus-plugin-pwa/tsconfig.worker.json
+++ b/packages/docusaurus-plugin-pwa/tsconfig.worker.json
@@ -6,8 +6,7 @@
     "tsBuildInfoFile": "lib/.tsbuildinfo-worker",
     "moduleResolution": "bundler",
     "module": "esnext",
-    "target": "esnext",
-    "types": ["node"]
+    "target": "esnext"
   },
   "include": ["src/sw.ts"],
   "exclude": ["**/__tests__/**"]
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 4d683ccc7b7c..2f348c658485 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -86,6 +86,7 @@
     "@types/serve-handler": "^6.1.4",
     "@types/update-notifier": "^6.0.4",
     "@types/webpack-bundle-analyzer": "^4.7.0",
+    "@types/webpack-env": "^1.18.8",
     "tmp-promise": "^3.0.3",
     "tree-node-cli": "^1.6.0"
   },
diff --git a/packages/docusaurus/src/client/clientEntry.tsx b/packages/docusaurus/src/client/clientEntry.tsx
index eb2f67368a20..db521bb39f50 100644
--- a/packages/docusaurus/src/client/clientEntry.tsx
+++ b/packages/docusaurus/src/client/clientEntry.tsx
@@ -23,12 +23,6 @@ function Router({children}: {children: ReactNode}): ReactNode {
   );
 }
 
-declare global {
-  interface NodeModule {
-    hot?: {accept: () => void};
-  }
-}
-
 const hydrate = Boolean(process.env.HYDRATE_CLIENT_ENTRY);
 
 // Client-side render (e.g: running in browser) to become single-page
diff --git a/packages/docusaurus/src/client/docusaurus.ts b/packages/docusaurus/src/client/docusaurus.ts
index 79bb4e21c779..24dff371728b 100644
--- a/packages/docusaurus/src/client/docusaurus.ts
+++ b/packages/docusaurus/src/client/docusaurus.ts
@@ -16,8 +16,7 @@ const fetched = new Set<string>();
 const loaded = new Set<string>();
 
 declare global {
-  // eslint-disable-next-line camelcase, no-underscore-dangle
-  const __webpack_require__: {gca: (name: string) => string};
+  // See https://github.com/microsoft/TypeScript/issues/56962
   interface Navigator {
     connection?: {effectiveType: string; saveData: boolean};
   }
diff --git a/packages/docusaurus/src/client/exports/ComponentCreator.tsx b/packages/docusaurus/src/client/exports/ComponentCreator.tsx
index 48d6640385b7..b5e70812b594 100644
--- a/packages/docusaurus/src/client/exports/ComponentCreator.tsx
+++ b/packages/docusaurus/src/client/exports/ComponentCreator.tsx
@@ -14,12 +14,6 @@ import flat from '../flat';
 import {RouteContextProvider} from '../routeContext';
 import type {RouteContext} from '@docusaurus/types';
 
-declare global {
-  interface NodeRequire {
-    resolveWeak: (name: string) => number;
-  }
-}
-
 export default function ComponentCreator(
   path: string,
   hash: string,
diff --git a/packages/docusaurus/src/server/i18n.ts b/packages/docusaurus/src/server/i18n.ts
index 8a80f4e6486f..3b0dab396d9f 100644
--- a/packages/docusaurus/src/server/i18n.ts
+++ b/packages/docusaurus/src/server/i18n.ts
@@ -64,7 +64,6 @@ function getDefaultCalendar(localeStr: string) {
   // See https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getCalendars
   // See https://caniuse.com/mdn-javascript_builtins_intl_locale_getcalendars
   const calendars =
-    // @ts-expect-error: new std method (Bun/JSC/WebKit)
     locale.getCalendars?.() ??
     // @ts-expect-error: non-std attribute (V8/Chromium/Node)
     locale.calendars;
@@ -84,7 +83,7 @@ function getDefaultDirection(localeStr: string) {
   // TODO Docusaurus v4: remove the fallback to locale.textInfo
   // @ts-expect-error: The TC39 proposal was updated
   const textInto = locale.getTextInfo?.() ?? locale.textInfo;
-  return textInto.direction;
+  return textInto.direction ?? 'ltr';
 }
 
 export function getDefaultLocaleConfig(
diff --git a/packages/docusaurus/tsconfig.client.json b/packages/docusaurus/tsconfig.client.json
index be1294f32d10..e9f8e88e5fd9 100644
--- a/packages/docusaurus/tsconfig.client.json
+++ b/packages/docusaurus/tsconfig.client.json
@@ -1,5 +1,8 @@
 {
   "extends": "../../tsconfig.base.client.json",
   "include": ["src/client", "src/*.d.ts"],
-  "exclude": ["**/__tests__/**"]
+  "exclude": ["**/__tests__/**"],
+  "compilerOptions": {
+    "types": ["node", "webpack-env"]
+  }
 }
diff --git a/tsconfig.base.client.json b/tsconfig.base.client.json
index ae15d13c915e..bd02813b86a4 100644
--- a/tsconfig.base.client.json
+++ b/tsconfig.base.client.json
@@ -2,9 +2,11 @@
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "tsBuildInfoFile": "${configDir}/lib/.tsbuildinfo-client",
+    "lib": ["DOM", "ESNext"],
     "noEmit": false,
     "moduleResolution": "bundler",
     "module": "esnext",
-    "target": "esnext"
+    "target": "esnext",
+    "types": []
   }
 }
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 247a84af9df5..43b39e34593a 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -6,6 +6,7 @@
     "incremental": true,
     "tsBuildInfoFile": "${configDir}/lib/.tsbuildinfo",
     "erasableSyntaxOnly": true,
+    "types": ["node"],
     /* Emit */
     "target": "ES2020",
     "lib": ["ESNext"],
diff --git a/website/tsconfig.json b/website/tsconfig.json
index caea2e3443e5..22c38a19eb6c 100644
--- a/website/tsconfig.json
+++ b/website/tsconfig.json
@@ -4,6 +4,7 @@
   "compilerOptions": {
     "lib": ["DOM", "ESNext"],
     "baseUrl": ".",
+    "ignoreDeprecations": "6.0",
     "resolveJsonModule": true,
     "allowArbitraryExtensions": true,
 
diff --git a/yarn.lock b/yarn.lock
index 769b4e0691bf..c39ff43d5bc5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4587,12 +4587,12 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-17.0.45.tgz#2c0fafd78705e7a18b7906b5201a522719dc5190"
   integrity sha512-w+tIMs3rq2afQdsPJlODhoUEKzFP1ayaoyl1CcnwtIlsVe7K7bA1NGm4s3PraqTLlXnbIN84zuBlxBWo1u9BLw==
 
-"@types/node@^18.16.19":
-  version "18.19.59"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-18.19.59.tgz#2de1b95b0b468089b616b2feb809755d70a74949"
-  integrity sha512-vizm2EqwV/7Zay+A6J3tGl9Lhr7CjZe2HmWS988sefiEmsyP9CeXEleho6i4hJk/8UtZAo0bWN4QPZZr83RxvQ==
+"@types/node@^20.19.37":
+  version "20.19.37"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.19.37.tgz#b4fb4033408dd97becce63ec932c9ec57a9e2919"
+  integrity sha512-8kzdPJ3FsNsVIurqBs7oodNnCEVbni9yUEkaHbgptDACOPW04jimGagZ51E6+lXUwJjgnBw+hyko/lkFWCldqw==
   dependencies:
-    undici-types "~5.26.4"
+    undici-types "~6.21.0"
 
 "@types/normalize-package-data@^2.4.0":
   version "2.4.1"
@@ -4826,6 +4826,11 @@
     tapable "^2.2.0"
     webpack "^5"
 
+"@types/webpack-env@^1.18.8":
+  version "1.18.8"
+  resolved "https://registry.yarnpkg.com/@types/webpack-env/-/webpack-env-1.18.8.tgz#71f083718c094204d7b64443701d32f1db3989e3"
+  integrity sha512-G9eAoJRMLjcvN4I08wB5I7YofOb/kaJNd5uoCMX+LbKXTPCF+ZIHuqTnFaK9Jz1rgs035f9JUPUhNFtqgucy/A==
+
 "@types/webpack-sources@*":
   version "3.2.3"
   resolved "https://registry.yarnpkg.com/@types/webpack-sources/-/webpack-sources-3.2.3.tgz#b667bd13e9fa15a9c26603dce502c7985418c3d8"
@@ -17876,15 +17881,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.9.3.tgz#5b4f59e15310ab17a216f5d6cf53ee476ede670f"
   integrity sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==
 
-typescript@~5.6.2:
-  version "5.6.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.6.3.tgz#5f3449e31c9d94febb17de03cc081dd56d81db5b"
-  integrity sha512-hjcS1mhfuyi4WW8IWtjP7brDrG2cuDZukyrYrSauoXGNgx0S7zceP07adYkJycEr56BOUTNPzbInooiN3fn1qw==
-
-typescript@~5.8.2:
-  version "5.8.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.8.2.tgz#8170b3702f74b79db2e5a96207c15e65807999e4"
-  integrity sha512-aJn6wq13/afZp/jT9QZmwEjDqqvSGp1VT5GVg+f/t6/oVyrgXM6BY1h9BRh/O5p3PlUPAe+WuiEZOmb/49RqoQ==
+typescript@~6.0.2:
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-6.0.2.tgz#0b1bfb15f68c64b97032f3d78abbf98bdbba501f"
+  integrity sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==
 
 ufo@^1.5.4:
   version "1.6.0"
@@ -17906,16 +17906,16 @@ unbox-primitive@^1.0.2:
     has-symbols "^1.0.3"
     which-boxed-primitive "^1.0.2"
 
-undici-types@~5.26.4:
-  version "5.26.5"
-  resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-5.26.5.tgz#bcd539893d00b56e964fd2657a4866b221a65617"
-  integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==
-
 undici-types@~6.19.2:
   version "6.19.8"
   resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-6.19.8.tgz#35111c9d1437ab83a7cdc0abae2f26d88eda0a02"
   integrity sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==
 
+undici-types@~6.21.0:
+  version "6.21.0"
+  resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-6.21.0.tgz#691d00af3909be93a7faa13be61b3a5b50ef12cb"
+  integrity sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==
+
 unicode-canonical-property-names-ecmascript@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-2.0.1.tgz#cb3173fe47ca743e228216e4a3ddc4c84d628cc2"