chart-based route finding

src/version.js

@@ -1,5 +1,17 @@
-const versionPromise = fetch('/version.json').then(async (response)=>await response.json())
-const metadataPromise = fetch('/metadata.json').then(async (response)=>await response.json())
+function _json(name) {
+    return async function(response) {
+        try {
+            return await response.json()
+        }
+        catch (e) {
+            console.error(`could not read ${name}`)
+            return null
+        }
+    }
+}
+
+const versionPromise = fetch('/version.json').then(_json('version.json'))
+const metadataPromise = fetch('/metadata.json').then(_json('metadata.json'))
 
 export const version = await versionPromise
 console.log('version', version)