Merge pull request #47 from styxlab/fix-isr-file-cache

catch exception, if file cache cannot be written

Author: styxlab

lib/cache.ts

@@ -31,5 +31,9 @@ export function setCache(key: string | null, object: unknown): void {
   if (!makeDirectory(cacheRoot)) return
 
   const filePath = path.join(cacheRoot, `${key}.txt`)
-  fs.writeFileSync(filePath, JSON.stringify(object as JSON))
+  try {
+    fs.writeFileSync(filePath, JSON.stringify(object as JSON))
+  } catch (error) {
+    console.warn('Could not write to file cache. This is expected during ISR, but not during deploy.', error)
+  }
 }