tried to address linting issues

webapp/.eslintrc

@@ -1,13 +1,16 @@
 {
+    "parser": "babel-eslint",
+    "parserOptions": {
+        "ecmaVersion": 8,
+        "ecmaFeatures": {
+            "jsx": true
+        },
+        "sourceType": "module"
+    },
     "env": {
         "browser": true,
         "es6": true
     },
-    "parserOptions": {
-        "ecmaFeatures": {
-            "jsx": true
-        }
-    },
     "plugins": [
         "react"
     ],
@@ -15,5 +18,8 @@
         "react": {
             "pragma": "h"
         }
+    },
+    "globals": {
+        "require": true,
     }
 }

webapp/views/components/Header.js

@@ -1,10 +1,9 @@
 import { h } from 'preact';
-import { Link } from 'preact-router';
 
-export default function () {
+export default function() {
     return (
         <header className="header">
-        <h1>PDFer</h1>
+            <h1>PDFer</h1>
         </header>
     )
 }

webapp/views/components/Layout.js

@@ -1,7 +1,7 @@
 import { h } from 'preact';
 import Header from './Header';
 
-export default function (props) {
+export default function(props) {
     return (
         <div id="app">
             <Header />

webapp/views/components/LetterOptions.js

@@ -4,25 +4,25 @@ import Input from './Input';
 import TextAreaInput from './TextAreaInput';
 import Select from './Select';
 
-const EXAMPLE_ADDRESS="Max Mustermann\nMusterstr. 73\n12345 Musterstadt";
+const EXAMPLE_ADDRESS = 'Max Mustermann\nMusterstr. 73\n12345 Musterstadt';
 
 export default function(props) {
     const templateTypeOptions = [
         {
             value: 'brief-fam',
-            name: "Familie"
+            name: 'Familie'
         },
         {
             value: 'brief-valerie',
-            name: "Valerie"
+            name: 'Valerie'
         },
         {
             value: 'brief-rain',
-            name: "Rain Baumeister"
+            name: 'Rain Baumeister'
         },
         {
             value: 'brief-thomas',
-            name: "Thomas"
+            name: 'Thomas'
         }
     ];
 

webapp/views/components/Preview.js

@@ -1,4 +1,4 @@
-import { Component, h } from 'preact';
+import { h } from 'preact';
 
 export default props => {
     if (props.pdfIsLoading) {

webapp/views/pages/404.js

@@ -1,6 +1,6 @@
 import { h } from 'preact';
 
-export default function (props) {
+export default function(props) {
     return (
         <div>
             <h2>No hope!</h2>