diff --git a/.eslintrc.js b/.eslintrc.js
index 993d1d1e19be..1b5801fe7d23 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -132,6 +132,12 @@ module.exports = {
         'header/header': OFF,
       },
     },
+    {
+      files: ['*.d.ts'],
+      rules: {
+        'import/no-duplicates': OFF,
+      },
+    },
     {
       files: ['*.js'],
       rules: {
diff --git a/packages/docusaurus-module-type-aliases/package.json b/packages/docusaurus-module-type-aliases/package.json
index f2747f6322b1..61d00806694b 100644
--- a/packages/docusaurus-module-type-aliases/package.json
+++ b/packages/docusaurus-module-type-aliases/package.json
@@ -14,7 +14,9 @@
   "devDependencies": {
     "@types/react": "*",
     "@types/react-helmet": "*",
-    "@types/react-router-dom": "*"
+    "@types/react-loadable": "*",
+    "@types/react-router-dom": "*",
+    "@types/react-router-config": "*"
   },
   "license": "MIT"
 }
diff --git a/packages/docusaurus-module-type-aliases/src/index.d.ts b/packages/docusaurus-module-type-aliases/src/index.d.ts
index 112b45660f26..e44eefb76eb4 100644
--- a/packages/docusaurus-module-type-aliases/src/index.d.ts
+++ b/packages/docusaurus-module-type-aliases/src/index.d.ts
@@ -69,16 +69,30 @@ declare module '@theme-original/*';
 declare module '@docusaurus/*';
 
 declare module '@docusaurus/Head' {
-  const helmet: typeof import('react-helmet').Helmet;
-  export default helmet;
+  import type {HelmetProps} from 'react-helmet';
+  import type {ReactNode} from 'react';
+
+  export type HeadProps = HelmetProps & {children: ReactNode};
+
+  const Head: (props: HeadProps) => JSX.Element;
+  export default Head;
 }
 
 declare module '@docusaurus/Link' {
+  import type {ReactNode} from 'react';
+
   type RRLinkProps = Partial<import('react-router-dom').LinkProps>;
-  type LinkProps = RRLinkProps & {
-    to?: string;
-    activeClassName?: string;
-    isNavLink?: boolean;
+  export type LinkProps = RRLinkProps & {
+    readonly isNavLink?: boolean;
+    readonly to?: string;
+    readonly href?: string;
+    readonly activeClassName?: string;
+    readonly children?: ReactNode;
+    readonly isActive?: (match: any, location: any) => boolean;
+    readonly autoAddBaseUrl?: boolean;
+
+    // escape hatch in case broken links check is annoying for a specific link
+    readonly 'data-noBrokenLinkCheck'?: boolean;
   };
   const Link: (props: LinkProps) => JSX.Element;
   export default Link;
@@ -125,31 +139,33 @@ declare module '@docusaurus/Translate' {
     InterpolateValues,
   } from '@docusaurus/Interpolate';
 
-  type TranslateProps<Str extends string> = InterpolateProps<Str> & {
+  export type TranslateParam<Str extends string> = Partial<
+    InterpolateProps<Str>
+  > & {
+    message: Str;
     id?: string;
     description?: string;
+    values?: InterpolateValues<Str, string | number>;
   };
-  export default function Translate<Str extends string>(
-    props: TranslateProps<Str>,
-  ): JSX.Element;
 
   export function translate<Str extends string>(
-    param: {
-      message: Str;
-      id?: string;
-      description?: string;
-    },
+    param: TranslateParam<Str>,
     values?: InterpolateValues<Str, string | number>,
   ): string;
+
+  export type TranslateProps<Str extends string> = InterpolateProps<Str> & {
+    id?: string;
+    description?: string;
+  };
+
+  export default function Translate<Str extends string>(
+    props: TranslateProps<Str>,
+  ): JSX.Element;
 }
 
 declare module '@docusaurus/router' {
-  export const Redirect: (props: {to: string}) => import('react').Component;
-  export function matchPath(
-    pathname: string,
-    opts: {path?: string; exact?: boolean; strict?: boolean},
-  ): boolean;
-  export function useLocation(): Location;
+  // eslint-disable-next-line import/no-extraneous-dependencies
+  export * from 'react-router-dom';
 }
 
 declare module '@docusaurus/useDocusaurusContext' {
@@ -157,9 +173,20 @@ declare module '@docusaurus/useDocusaurusContext' {
 }
 
 declare module '@docusaurus/useBaseUrl' {
+  export type BaseUrlOptions = {
+    forcePrependBaseUrl?: boolean;
+    absolute?: boolean;
+  };
+
+  export type BaseUrlUtils = {
+    withBaseUrl: (url: string, options?: BaseUrlOptions) => string;
+  };
+
+  export function useBaseUrlUtils(): BaseUrlUtils;
+
   export default function useBaseUrl(
     relativePath: string | undefined,
-    opts?: {absolute?: true; forcePrependBaseUrl?: true},
+    opts?: BaseUrlOptions,
   ): string;
 }
 
@@ -173,6 +200,16 @@ declare module '@docusaurus/ExecutionEnvironment' {
   export default ExecutionEnvironment;
 }
 
+declare module '@docusaurus/ComponentCreator' {
+  import type Loadable from 'react-loadable';
+
+  function ComponentCreator(
+    path: string,
+    hash: string,
+  ): ReturnType<typeof Loadable>;
+  export default ComponentCreator;
+}
+
 declare module '@docusaurus/BrowserOnly' {
   export type Props = {
     children?: () => JSX.Element;
@@ -187,6 +224,31 @@ declare module '@docusaurus/isInternalUrl' {
   export default function isInternalUrl(url?: string): boolean;
 }
 
+declare module '@docusaurus/Noop' {
+  export default function (): null;
+}
+
+declare module '@docusaurus/renderRoutes' {
+  // eslint-disable-next-line import/no-extraneous-dependencies
+  import {renderRoutes} from 'react-router-config';
+
+  export default renderRoutes;
+}
+
+declare module '@docusaurus/useGlobalData' {
+  export function useAllPluginInstancesData<T = unknown>(
+    pluginName: string,
+  ): Record<string, T>;
+
+  export function usePluginData<T = unknown>(
+    pluginName: string,
+    pluginId?: string,
+  ): T;
+
+  function useGlobalData(): Record<string, any>;
+  export default useGlobalData;
+}
+
 declare module '*.module.css' {
   const classes: {readonly [key: string]: string};
   export default classes;
diff --git a/packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts b/packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts
index 9d398b5dcaad..87b6c07d07e5 100644
--- a/packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts
+++ b/packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts
@@ -100,7 +100,7 @@ declare module '@theme/DocPage' {
     readonly route: {
       readonly path: string;
       readonly component: () => JSX.Element;
-      readonly routes: readonly DocumentRoute[];
+      readonly routes: DocumentRoute[];
     };
   };
 
diff --git a/packages/docusaurus-theme-classic/src/types.d.ts b/packages/docusaurus-theme-classic/src/types.d.ts
index db097f87d76a..ebe36f5d51b6 100644
--- a/packages/docusaurus-theme-classic/src/types.d.ts
+++ b/packages/docusaurus-theme-classic/src/types.d.ts
@@ -259,7 +259,9 @@ declare module '@theme/Layout' {
 }
 
 declare module '@theme/LayoutHead' {
-  import type {Props} from '@theme/Layout';
+  import type {Props as LayoutProps} from '@theme/Layout';
+
+  export type Props = Omit<LayoutProps, 'children'>;
 
   const LayoutHead: (props: Props) => JSX.Element;
   export default LayoutHead;
diff --git a/packages/docusaurus/src/client/exports/ComponentCreator.tsx b/packages/docusaurus/src/client/exports/ComponentCreator.tsx
index 2cc048abca30..ad5f73c414b1 100644
--- a/packages/docusaurus/src/client/exports/ComponentCreator.tsx
+++ b/packages/docusaurus/src/client/exports/ComponentCreator.tsx
@@ -12,6 +12,8 @@ import routesChunkNames from '@generated/routesChunkNames';
 import registry from '@generated/registry';
 import flat from '../flat';
 
+type OptsLoader = Record<string, typeof registry[keyof typeof registry][0]>;
+
 function ComponentCreator(
   path: string,
   hash: string,
@@ -28,7 +30,7 @@ function ComponentCreator(
   const chunkNames = routesChunkNames[chunkNamesKey];
   const optsModules: string[] = [];
   const optsWebpack: string[] = [];
-  const optsLoader = {};
+  const optsLoader: OptsLoader = {};
 
   /* Prepare opts data that react-loadable needs
   https://github.com/jamiebuilds/react-loadable#declaring-which-modules-are-being-loaded
diff --git a/packages/docusaurus/src/client/exports/Head.tsx b/packages/docusaurus/src/client/exports/Head.tsx
index 42d39197c14c..ad4d49ef98b9 100644
--- a/packages/docusaurus/src/client/exports/Head.tsx
+++ b/packages/docusaurus/src/client/exports/Head.tsx
@@ -5,10 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import React, {ReactNode} from 'react';
-import {Helmet, HelmetProps} from 'react-helmet';
-
-type HeadProps = HelmetProps & {children: ReactNode};
+import React from 'react';
+import {Helmet} from 'react-helmet';
+import type {HeadProps} from '@docusaurus/Head';
 
 function Head(props: HeadProps): JSX.Element {
   return <Helmet {...props} />;
diff --git a/packages/docusaurus/src/client/exports/Interpolate.tsx b/packages/docusaurus/src/client/exports/Interpolate.tsx
index bbb252c240db..50afd7743558 100644
--- a/packages/docusaurus/src/client/exports/Interpolate.tsx
+++ b/packages/docusaurus/src/client/exports/Interpolate.tsx
@@ -6,6 +6,11 @@
  */
 
 import React, {ReactNode} from 'react';
+import type {
+  InterpolateProps,
+  InterpolateValues,
+  ExtractInterpolatePlaceholders,
+} from '@docusaurus/Interpolate';
 
 /*
 Minimal implementation of a React interpolate component.
@@ -16,16 +21,6 @@ More details here: https://github.com/facebook/docusaurus/pull/4295
 const ValueRegexp = /{\w+}/g;
 const ValueFoundMarker = '{}'; // does not care much
 
-// TODO use TS template literal feature to make values typesafe!
-// (requires upgrading TS first)
-// eslint-disable-next-line @typescript-eslint/no-unused-vars
-type ExtractInterpolatePlaceholders<Str extends string> = string;
-
-type InterpolateValues<Str extends string, Value extends ReactNode> = Record<
-  ExtractInterpolatePlaceholders<Str>,
-  Value
->;
-
 // TS function overload: if all the values are plain strings, then interpolate returns a simple string
 export function interpolate<Str extends string>(
   text: Str,
@@ -93,11 +88,6 @@ export function interpolate<Str extends string, Value extends ReactNode>(
   }
 }
 
-export type InterpolateProps<Str extends string> = {
-  children: Str;
-  values?: InterpolateValues<Str, ReactNode>;
-};
-
 export default function Interpolate<Str extends string>({
   children,
   values,
diff --git a/packages/docusaurus/src/client/exports/Link.tsx b/packages/docusaurus/src/client/exports/Link.tsx
index 9c1504507a68..feb49924d603 100644
--- a/packages/docusaurus/src/client/exports/Link.tsx
+++ b/packages/docusaurus/src/client/exports/Link.tsx
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import React, {ReactNode, useEffect, useRef} from 'react';
+import React, {useEffect, useRef} from 'react';
 
 import {NavLink, Link as RRLink} from 'react-router-dom';
 import isInternalUrl from './isInternalUrl';
@@ -13,28 +13,15 @@ import ExecutionEnvironment from './ExecutionEnvironment';
 import {useLinksCollector} from '../LinksCollector';
 import {useBaseUrlUtils} from './useBaseUrl';
 
+import type {LinkProps} from '@docusaurus/Link';
+import type docusaurus from '../docusaurus';
+
 declare global {
   interface Window {
-    docusaurus: {
-      prefetch: (routePath: string) => boolean;
-      preload: (routePath: string) => boolean;
-    };
+    docusaurus: typeof docusaurus;
   }
 }
 
-interface Props {
-  readonly isNavLink?: boolean;
-  readonly to?: string;
-  readonly href?: string;
-  readonly activeClassName?: string;
-  readonly children?: ReactNode;
-  readonly isActive?: () => boolean;
-  readonly autoAddBaseUrl?: boolean;
-
-  // escape hatch in case broken links check is annoying for a specific link
-  readonly 'data-noBrokenLinkCheck'?: boolean;
-}
-
 // TODO all this wouldn't be necessary if we used ReactRouter basename feature
 // We don't automatically add base urls to all links,
 // only the "safe" ones, starting with / (like /docs/introduction)
@@ -51,7 +38,7 @@ function Link({
   'data-noBrokenLinkCheck': noBrokenLinkCheck,
   autoAddBaseUrl = true,
   ...props
-}: Props): JSX.Element {
+}: LinkProps): JSX.Element {
   const {withBaseUrl} = useBaseUrlUtils();
   const linksCollector = useLinksCollector();
 
@@ -92,8 +79,8 @@ function Link({
 
   const IOSupported = ExecutionEnvironment.canUseIntersectionObserver;
 
-  let io;
-  const handleIntersection = (el, cb) => {
+  let io: IntersectionObserver;
+  const handleIntersection = (el: HTMLAnchorElement, cb: () => void) => {
     io = new window.IntersectionObserver((entries) => {
       entries.forEach((entry) => {
         if (el === entry.target) {
@@ -112,7 +99,7 @@ function Link({
     io.observe(el);
   };
 
-  const handleRef = (ref) => {
+  const handleRef = (ref: HTMLAnchorElement | null) => {
     if (IOSupported && ref && isInternal) {
       // If IO supported and element reference found, setup Observer functionality.
       handleIntersection(ref, () => {
diff --git a/packages/docusaurus/src/client/exports/Translate.tsx b/packages/docusaurus/src/client/exports/Translate.tsx
index a4253ed2fe6d..ec0a39a74831 100644
--- a/packages/docusaurus/src/client/exports/Translate.tsx
+++ b/packages/docusaurus/src/client/exports/Translate.tsx
@@ -8,9 +8,9 @@
 import React from 'react';
 import Interpolate, {
   interpolate,
-  InterpolateProps,
   InterpolateValues,
 } from '@docusaurus/Interpolate';
+import type {TranslateParam, TranslateProps} from '@docusaurus/Translate';
 
 // Can't read it from context, due to exposing imperative API
 import codeTranslations from '@generated/codeTranslations';
@@ -25,12 +25,6 @@ function getLocalizedMessage({
   return codeTranslations[id ?? message] ?? message;
 }
 
-export type TranslateParam<Str extends string> = {
-  message: Str;
-  id?: string;
-  description?: string;
-  values?: InterpolateValues<Str, string | number>;
-};
 // Imperative translation API is useful for some edge-cases:
 // - translating page titles (meta)
 // - translating string props (input placeholders, image alt, aria labels...)
@@ -42,11 +36,6 @@ export function translate<Str extends string>(
   return interpolate(localizedMessage, values);
 }
 
-export type TranslateProps<Str extends string> = InterpolateProps<Str> & {
-  id?: string;
-  description?: string;
-};
-
 // Maybe we'll want to improve this component with additional features
 // Like toggling a translation mode that adds a little translation button near the text?
 export default function Translate<Str extends string>({
diff --git a/packages/docusaurus/src/client/exports/useBaseUrl.ts b/packages/docusaurus/src/client/exports/useBaseUrl.ts
index 627d140141a5..926e8979cbdc 100644
--- a/packages/docusaurus/src/client/exports/useBaseUrl.ts
+++ b/packages/docusaurus/src/client/exports/useBaseUrl.ts
@@ -7,11 +7,7 @@
 
 import useDocusaurusContext from './useDocusaurusContext';
 import {hasProtocol} from './isInternalUrl';
-
-type BaseUrlOptions = Partial<{
-  forcePrependBaseUrl: boolean;
-  absolute: boolean;
-}>;
+import type {BaseUrlOptions, BaseUrlUtils} from '@docusaurus/useBaseUrl';
 
 function addBaseUrl(
   siteUrl: string | undefined,
@@ -45,10 +41,6 @@ function addBaseUrl(
   return absolute ? siteUrl + basePath : basePath;
 }
 
-export type BaseUrlUtils = {
-  withBaseUrl: (url: string, options?: BaseUrlOptions) => string;
-};
-
 export function useBaseUrlUtils(): BaseUrlUtils {
   const {
     siteConfig: {baseUrl = '/', url: siteUrl} = {},
diff --git a/yarn.lock b/yarn.lock
index 96d103e2df30..276f9b0f46f3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3629,18 +3629,18 @@
   dependencies:
     "@types/react" "*"
 
-"@types/react-loadable@^5.5.3":
-  version "5.5.3"
-  resolved "https://registry.yarnpkg.com/@types/react-loadable/-/react-loadable-5.5.3.tgz#65d50a6f9f7ff62513010bd6a460ed60ba58ca7d"
-  integrity sha512-BRzQhbMo5CjfxFU2tmmBNh16QqKUwNiaX0vflCwIVPVG8g/pCOyJ3rOdSPo4m+TPS7C9q/TupaqYXXTMtFoyng==
+"@types/react-loadable@*", "@types/react-loadable@^5.5.3":
+  version "5.5.4"
+  resolved "https://registry.yarnpkg.com/@types/react-loadable/-/react-loadable-5.5.4.tgz#9bfb31e1299e9a3b23ea6cae437fa8813afde544"
+  integrity sha512-otKcjNCfVUzdBMdwOqFITTmBruIXw6GeoZitTBvJ6BMrif8Utu2JLy42GWukNnYI7ewJdncUCooz5Y/1dBz4+w==
   dependencies:
     "@types/react" "*"
     "@types/webpack" "*"
 
-"@types/react-router-config@^5.0.1":
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/@types/react-router-config/-/react-router-config-5.0.1.tgz#54da8418190ee47484dee279975e2b8038fb8b5d"
-  integrity sha512-D4srFL4XP21GjWWnM7mL8j+Nrrw13pc2TYr57WTHJxU9YTxnrXL7p1iqGtwecgwhyeXJSm4WrGwq0SOgSALVbA==
+"@types/react-router-config@*", "@types/react-router-config@^5.0.1":
+  version "5.0.2"
+  resolved "https://registry.yarnpkg.com/@types/react-router-config/-/react-router-config-5.0.2.tgz#4d3b52e71ed363a1976a12321e67b09a99ad6d10"
+  integrity sha512-WOSetDV3YPxbkVJAdv/bqExJjmcdCi/vpCJh3NfQOy1X15vHMSiMioXIcGekXDJJYhqGUMDo9e337mh508foAA==
   dependencies:
     "@types/history" "*"
     "@types/react" "*"