✨[init] add extra checks

DataDog · Dec 4, 2019 · 3f122bf · 3f122bf
1 parent ba86cf8
commit 3f122bf
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/packages/core/src/init.ts b/packages/core/src/init.ts
@@ -47,5 +47,18 @@ export function isValidBrowsingContext() {
     console.error('Cookies are not authorized, we will not send any data.')
     return false
   }
+  if (isDocPrerendered() || isLocalFile()) {
+    console.error('Execution is not allowed in the current context.')
+    return false
+  }
   return true
 }
+
+function isLocalFile() {
+  return window.location.protocol === 'file:'
+}
+
+function isDocPrerendered() {
+  // https://www.w3.org/TR/resource-hints/#dfn-prerender
+  return document.visibilityState === 'prerender'
+}