give service comp prop types

priv/frontend/package.json

@@ -10,6 +10,7 @@
     "i": "^0.3.6",
     "ms": "^2.1.1",
     "npm": "^6.1.0",
+    "prop-types": "^15.6.2",
     "react": "^16.4.0",
     "react-dom": "^16.4.0",
     "react-placeholder": "^3.0.1",

priv/frontend/src/Service.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 
@@ -29,4 +30,19 @@ const Service = ({ graph, name, status, latency, description }) => (
   </div>
 );
 
+Service.defaultProps = {
+  graph: null,
+  latency: null,
+};
+
+Service.propTypes = {
+  graph: PropTypes.arrayOf(
+    PropTypes.arrayOf(PropTypes.number),
+  ),
+  name: PropTypes.string.isRequired,
+  status: PropTypes.bool.isRequired,
+  latency: PropTypes.number,
+  description: PropTypes.string.isRequired,
+};
+
 export default Service;