1 files changed, 23 insertions, 0 deletions
diff --git a/toolkit/components/uniffi-bindgen-gecko-js/src/templates/js/Int64.jsm b/toolkit/components/uniffi-bindgen-gecko-js/src/templates/js/Int64.jsm
new file mode 100644
index 0000000000..7e62a4b401
--- /dev/null
+++ b/toolkit/components/uniffi-bindgen-gecko-js/src/templates/js/Int64.jsm
@@ -0,0 +1,23 @@
+class {{ ffi_converter }} extends FfiConverter {
+    static checkType(name, value) {
+        super.checkType(name, value);
+        if (!Number.isSafeInteger(value)) {
+            throw TypeError(`${name} exceeds the safe integer bounds (${value})`);
+        }
+    }
+    static computeSize() {
+        return 8;
+    }
+    static lift(value) {
+        return value;
+    }
+    static lower(value) {
+        return value;
+    }
+    static write(dataStream, value) {
+        dataStream.writeInt64(value)
+    }
+    static read(dataStream) {
+        return dataStream.readInt64()
+    }
+}