prop types

src/components/About/About.js

@@ -45,9 +45,3 @@ About.propTypes = {
   pageTitle: PropTypes.string,
   email: PropTypes.string
 }
-
-About.defaultProps = {
-  title: null,
-  pageTitle: null,
-  email: null
-}

src/components/Articles/Categories/Categories.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import PropTypes from 'prop-types'
 import { useLocation } from '@reach/router'
 import { Link } from 'gatsby'
 
@@ -19,3 +20,7 @@ const Categories = ({ children, setQuery = () => null }) => {
 }
 
 export default Categories
+
+Categories.propTypes = {
+  setQuery: PropTypes.func
+}

src/components/Articles/Search/Search.js

@@ -28,5 +28,13 @@ const Search = ({ allArticles, filterArticles, articlesLength, resultsLength, qu
 export default Search
 
 Search.propTypes = {
-	articlesLength: PropTypes.number
+	allArticles: PropTypes.array,
+	filterArticles: PropTypes.func,
+	articlesLength: PropTypes.number,
+	resultsLength: PropTypes.number,
+	query: PropTypes.string,
+	setQuery: PropTypes.func,
+	setFiltredArticles: PropTypes.func,
+	setLimit: PropTypes.func,
+	onPage: PropTypes.number
 }

src/components/SEO/SEO.js

@@ -70,11 +70,11 @@ export default SEO
 
 SEO.propTypes = {
   title: PropTypes.string,
-  description: PropTypes.string
-}
-
-SEO.defaultProps = {
-  title: null,
-  description: null
+  titleTemplate: PropTypes.bool,
+  keywords: PropTypes.string,
+  description: PropTypes.string,
+  image: PropTypes.string,
+  type: PropTypes.string,
+  canonical: PropTypes.string
 }
 

src/components/ViewCounter/ViewCounter.js

@@ -1,4 +1,5 @@
 import React, { useEffect, useState } from 'react';
+import PropTypes from 'prop-types'
 import firebase from 'gatsby-plugin-firebase';
 import incrementViews from '../../lib/increment-views';
 
@@ -29,3 +30,7 @@ const ViewCounter = ({ id }) => {
 };
 
 export default ViewCounter;
+
+ViewCounter.propTypes = {
+  id: PropTypes.string
+}