style: fix eslint issues (#437)

src/components/FavIcon.js

@@ -1,4 +1,4 @@
-import React, { useEffect, useState, forwardRef, useRef } from 'react';
+import React, { useEffect, useState, useRef } from 'react';
 
 function useInterval(callback, delay) {
   const savedCallback = useRef();
@@ -44,7 +44,7 @@ function useWickedFavIcon() {
 }
 
 export default function FavIcon() {
-  const { letter, index, canvasRef } = useWickedFavIcon();
+  const { /* letter, index, */ canvasRef } = useWickedFavIcon();
   return (
     <div>
       <canvas

src/components/Person.js

@@ -7,7 +7,7 @@ import * as icons from '../util/icons';
 
 export default function Person({ person, currentTag }) {
   const url = new URL(person.url);
-  const img = `https://images.weserv.nl/?url=https://unavatar.now.sh/${url.host}&w=100&l=9&af&il&n=-1`
+  const img = `https://images.weserv.nl/?url=https://unavatar.now.sh/${url.host}&w=100&l=9&af&il&n=-1`;
   return (
     <PersonWrapper>
       <PersonInner>
@@ -23,11 +23,10 @@ export default function Person({ person, currentTag }) {
             rel="noopener noreferrer"
             className="displayLink"
             href={person.url}
-          >{`${url.host}${
-            url.pathname.endsWith('/')
-              ? url.pathname.substr(0, url.pathname.length - 1)
-              : url.pathname
-          }`}</a>
+          >
+            {url.host}
+            {url.pathname.replace(/\/$/, '')}
+          </a>
         </header>
         <p>{person.description}</p>
         <Tags>

src/components/header.js

@@ -1,4 +1,4 @@
-import React, { useEffect, useState, useRef } from 'react';
+import React from 'react';
 import { Link } from 'gatsby';
 import PropTypes from 'prop-types';
 import Helmet from 'react-helmet';
@@ -34,10 +34,14 @@ function Header({ siteTitle, siteDescription, siteUrl }) {
 }
 Header.propTypes = {
   siteTitle: PropTypes.string,
+  siteDescription: PropTypes.string,
+  siteUrl: PropTypes.string,
 };
 
 Header.defaultProps = {
-  siteTitle: ``,
+  siteTitle: '',
+  siteDescription: '',
+  siteUrl: '',
 };
 
 export default Header;

src/components/image.js

@@ -1,6 +1,6 @@
-import React from "react"
-import { useStaticQuery, graphql } from "gatsby"
-import Img from "gatsby-image"
+import React from 'react';
+import { useStaticQuery, graphql } from 'gatsby';
+import Img from 'gatsby-image';
 
 /*
  * This component is built using `gatsby-image` to automatically serve optimized
@@ -24,9 +24,9 @@ const Image = () => {
         }
       }
     }
-  `)
+  `);
 
-  return <Img fluid={data.placeholderImage.childImageSharp.fluid} />
-}
+  return <Img fluid={data.placeholderImage.childImageSharp.fluid} />;
+};
 
-export default Image
+export default Image;

src/context/FilterContext.js

@@ -44,5 +44,9 @@ const FilterProvider = function({ children }) {
   );
 };
 
+FilterProvider.propTypes = {
+  children: React.Children,
+};
+
 export default FilterContext;
 export { FilterProvider };

src/util/stats.js

@@ -21,7 +21,7 @@ export function countries() {
     .reduce((acc, country) => {
       if (acc[country.name]) {
         // exists, update
-        acc[country.name].count = acc[country.name].count + 1;
+        acc[country.name].count += acc[country.name].count;
       } else {
         acc[country.name] = {
           ...country,