1 files changed, 30 insertions, 0 deletions
diff --git a/extensions/web/lib.rs b/extensions/web/lib.rs
index 0d2dbbd78..7fa809776 100644
--- a/extensions/web/lib.rs
+++ b/extensions/web/lib.rs
@@ -1,7 +1,9 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
 
+use deno_core::error::AnyError;
 use deno_core::include_js_files;
 use deno_core::Extension;
+use std::fmt;
 use std::path::PathBuf;
 
 /// Load and execute the javascript code.
@@ -24,3 +26,31 @@ pub fn init() -> Extension {
 pub fn get_declaration() -> PathBuf {
   PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("lib.deno_web.d.ts")
 }
+
+#[derive(Debug)]
+pub struct DomExceptionQuotaExceededError {
+  pub msg: String,
+}
+
+impl DomExceptionQuotaExceededError {
+  pub fn new(msg: &str) -> Self {
+    DomExceptionQuotaExceededError {
+      msg: msg.to_string(),
+    }
+  }
+}
+
+impl fmt::Display for DomExceptionQuotaExceededError {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    f.pad(&self.msg)
+  }
+}
+
+impl std::error::Error for DomExceptionQuotaExceededError {}
+
+pub fn get_quota_exceeded_error_class_name(
+  e: &AnyError,
+) -> Option<&'static str> {
+  e.downcast_ref::<DomExceptionQuotaExceededError>()
+    .map(|_| "DOMExceptionQuotaExceededError")
+}