drop some types in

components/Preview.tsx

@@ -1,7 +1,15 @@
 import React from 'react'
 
-export default (props) => {
-  if (props.pdfIsLoading) {
+export default function Preview({
+  pdfIsLoading,
+  pdfError,
+  pdfUrl,
+}: {
+  pdfIsLoading: boolean
+  pdfError: string
+  pdfUrl: string
+}) {
+  if (pdfIsLoading) {
     return <div>Lade&hellip;</div>
   }
 
@@ -12,18 +20,18 @@ export default (props) => {
     borderRadius: '3px',
   }
 
-  if (props.pdfError) {
+  if (pdfError) {
     return (
       <div style={errorStyles}>
         <span role="img" aria-label="Crying Man">
           😢
         </span>{' '}
-        {props.pdfError}
+        {pdfError}
       </div>
     )
   }
 
-  if (!props.pdfUrl) {
+  if (!pdfUrl) {
     return <div>Knopf drücken dann gibts hier was zu sehen!</div>
   }
 
@@ -32,5 +40,5 @@ export default (props) => {
     height: '1050px',
   }
 
-  return <embed src={props.pdfUrl} style={styles} type="application/pdf" />
+  return <embed src={pdfUrl} style={styles} type="application/pdf" />
 }