1 files changed, 20 insertions, 0 deletions
diff --git a/components/shared/fonts/lib.rs b/components/shared/fonts/lib.rs
new file mode 100644
index 00000000000..032dcfd19e0
--- /dev/null
+++ b/components/shared/fonts/lib.rs
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#![deny(unsafe_code)]
+
+use std::sync::Arc;
+
+use malloc_size_of_derive::MallocSizeOf;
+use range::{int_range_index, RangeIndex};
+use serde::{Deserialize, Serialize};
+
+int_range_index! {
+    #[derive(Deserialize, MallocSizeOf, Serialize)]
+    /// An index that refers to a byte offset in a text run. This could
+    /// the middle of a glyph.
+    struct ByteIndex(isize)
+}
+
+pub type WebFontLoadFinishedCallback = Arc<dyn Fn(bool) + Send + Sync + 'static>;