diff --git a/packages/docusaurus-plugin-content-docs/src/types.ts b/packages/docusaurus-plugin-content-docs/src/types.ts
index 74b0a41b90..3b42a0c6e1 100644
--- a/packages/docusaurus-plugin-content-docs/src/types.ts
+++ b/packages/docusaurus-plugin-content-docs/src/types.ts
@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+/* eslint-disable camelcase */
 // eslint-disable-next-line spaced-comment
 /// <reference types="@docusaurus/module-type-aliases" />
 
diff --git a/packages/docusaurus-theme-common/src/utils/usePluralForm.ts b/packages/docusaurus-theme-common/src/utils/usePluralForm.ts
index 19d853dfeb..66068d4503 100644
--- a/packages/docusaurus-theme-common/src/utils/usePluralForm.ts
+++ b/packages/docusaurus-theme-common/src/utils/usePluralForm.ts
@@ -107,7 +107,9 @@ function selectPluralMessage(
   }
 }
 
-export function usePluralForm() {
+export function usePluralForm(): {
+  selectMessage: (count: number, pluralMessages: string) => string;
+} {
   const localePluralForm = useLocalePluralForms();
   return {
     selectMessage: (count: number, pluralMessages: string): string => {
diff --git a/packages/docusaurus-utils-validation/src/validationUtils.ts b/packages/docusaurus-utils-validation/src/validationUtils.ts
index 10e03eb1a9..3365a32955 100644
--- a/packages/docusaurus-utils-validation/src/validationUtils.ts
+++ b/packages/docusaurus-utils-validation/src/validationUtils.ts
@@ -35,7 +35,7 @@ export const logValidationBugReportHint = (): void => {
   );
 };
 
-export function printWarning(warning?: Joi.ValidationError) {
+export function printWarning(warning?: Joi.ValidationError): void {
   if (warning) {
     const warningMessages = warning.details
       .map(({message}) => message)
diff --git a/packages/docusaurus-utils/src/markdownParser.ts b/packages/docusaurus-utils/src/markdownParser.ts
index 00ee44e213..1f9377dfdd 100644
--- a/packages/docusaurus-utils/src/markdownParser.ts
+++ b/packages/docusaurus-utils/src/markdownParser.ts
@@ -36,17 +36,17 @@ export function createExcerpt(fileString: string): string | undefined {
       // Remove HTML tags.
       .replace(/<[^>]*>/g, '')
       // Remove Title headers
-      .replace(/^\#\s*([^#]*)\s*\#?/gm, '')
+      .replace(/^#\s*([^#]*)\s*#?/gm, '')
       // Remove Markdown + ATX-style headers
-      .replace(/^\#{1,6}\s*([^#]*)\s*(\#{1,6})?/gm, '$1')
+      .replace(/^#{1,6}\s*([^#]*)\s*(#{1,6})?/gm, '$1')
       // Remove emphasis and strikethroughs.
-      .replace(/([\*_~]{1,3})(\S.*?\S{0,1})\1/g, '$2')
+      .replace(/([*_~]{1,3})(\S.*?\S{0,1})\1/g, '$2')
       // Remove images.
-      .replace(/\!\[(.*?)\][\[\(].*?[\]\)]/g, '$1')
+      .replace(/!\[(.*?)\][[(].*?[\])]/g, '$1')
       // Remove footnotes.
-      .replace(/\[\^.+?\](\: .*?$)?/g, '')
+      .replace(/\[\^.+?\](: .*?$)?/g, '')
       // Remove inline links.
-      .replace(/\[(.*?)\][\[\(].*?[\]\)]/g, '$1')
+      .replace(/\[(.*?)\][[(].*?[\])]/g, '$1')
       // Remove inline code.
       .replace(/`(.+?)`/g, '$1')
       // Remove blockquotes.
diff --git a/packages/docusaurus/src/server/i18n.ts b/packages/docusaurus/src/server/i18n.ts
index fa8a021dde..0546522e70 100644
--- a/packages/docusaurus/src/server/i18n.ts
+++ b/packages/docusaurus/src/server/i18n.ts
@@ -29,7 +29,10 @@ export function getDefaultLocaleConfig(locale: string): I18nLocaleConfig {
   };
 }
 
-export function shouldWarnAboutNodeVersion(version: number, locales: string[]) {
+export function shouldWarnAboutNodeVersion(
+  version: number,
+  locales: string[],
+): boolean {
   const isOnlyEnglish = locales.length === 1 && locales.includes('en');
   const isOlderNodeVersion = version < 14;
   return isOlderNodeVersion && !isOnlyEnglish;