add window.reportError

Author: karlseguin

src/browser/events/event.zig

@@ -72,7 +72,7 @@ pub const Event = struct {
             .custom_event => .{ .CustomEvent = @as(*CustomEvent, @ptrCast(evt)).* },
             .progress_event => .{ .ProgressEvent = @as(*ProgressEvent, @ptrCast(evt)).* },
             .mouse_event => .{ .MouseEvent = @as(*parser.MouseEvent, @ptrCast(evt)) },
-            .error_event => .{ .ErrorEvent = @as(*ErrorEvent, @ptrCast(evt)).* },
+            .error_event => .{ .ErrorEvent = (@as(*ErrorEvent, @fieldParentPtr("proto", evt))).* },
             .message_event => .{ .MessageEvent = @as(*MessageEvent, @ptrCast(evt)).* },
             .keyboard_event => .{ .KeyboardEvent = @as(*parser.KeyboardEvent, @ptrCast(evt)) },
             .pop_state => .{ .PopStateEvent = @as(*PopStateEvent, @ptrCast(evt)).* },

src/browser/html/error_event.zig

@@ -42,7 +42,7 @@ pub const ErrorEvent = struct {
         const event = try parser.eventCreate();
         defer parser.eventDestroy(event);
         try parser.eventInit(event, event_type, .{});
-        parser.eventSetInternalType(event, .event);
+        parser.eventSetInternalType(event, .error_event);
 
         const o = opts orelse ErrorEventInit{};
 

src/browser/html/window.zig

@@ -41,6 +41,7 @@ const Request = @import("../fetch/Request.zig");
 const fetchFn = @import("../fetch/fetch.zig").fetch;
 
 const storage = @import("../storage/storage.zig");
+const ErrorEvent = @import("error_event.zig").ErrorEvent;
 
 // https://dom.spec.whatwg.org/#interface-window-extensions
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#window
@@ -281,6 +282,25 @@ pub const Window = struct {
         return out;
     }
 
+    pub fn _reportError(self: *Window, err: js.Object, page: *Page) !void {
+        var error_event = try ErrorEvent.constructor("error", .{
+            .@"error" = err,
+        });
+        _ = try parser.eventTargetDispatchEvent(
+            parser.toEventTarget(Window, self),
+            @as(*parser.Event, &error_event.proto),
+        );
+
+        if (parser.eventDefaultPrevented(&error_event.proto) == false) {
+            const err_string = err.toString() catch "Unknown error";
+            log.info(.user_script, "error", .{
+                .err = err_string,
+                .stack = page.stackTrace() catch "???",
+                .source = "window.reportError",
+            });
+        }
+    }
+
     const CreateTimeoutOpts = struct {
         name: []const u8,
         args: []js.Object = &.{},

src/tests/window/window.html

@@ -149,3 +149,19 @@
 
   testing.eventually(() => testing.expectEqual(true, isWindowTarget));
 </script>
+
+<script id=reportError>
+  let errorEventFired = false;
+  let capturedError = null;
+
+  window.addEventListener('error', (e) => {
+    errorEventFired = true;
+    capturedError = e.error;
+  });
+
+  const testError = new Error('Test error message');
+  window.reportError(testError);
+
+  testing.expectEqual(true, errorEventFired);
+  testing.expectEqual(testError, capturedError);
+</script>