TypeError
SyncReads a property on an undefined value inside a click handler.
Expected message
Cannot read properties of undefined (reading 'orderId')
Fired 2×
Reporter verification console
Break something on purpose.Check that you heard about it.
One click throws a real runtime error picked at random from six classes. Each one reaches your global handlers exactly as a production crash would, so you can confirm your reporter captured the type, message, and stack.
Last fired: 10:31:48 (seeded)
What happens on click
- 1A scenario is picked at random from the six below
- 2A genuine error is thrown on a real code path
- 3It bubbles to window.onerror, unhandledrejection, or the boundary
- 4A row is added to the session log for cross-checking
Errors fired
8
This session, including history
Uncaught
7
Should appear in your reporter
Handled by boundary
1
Caught via componentDidCatch
Scenario coverage
6/6
Every error class exercised
Error scenarios
Fire a specific error class instead of a random one.
ReferenceError
SyncReferences a variable that was never declared in scope.
Expected message
checkoutSession is not defined
Fired 1×
RangeError
SyncCreates an array with an invalid negative length.
Expected message
Invalid array length
Fired 1×
Unhandled Promise Rejection
AsyncRejects a promise with no catch handler, surfacing via unhandledrejection.
Expected message
Request to /api/inventory timed out after 5000ms
Fired 2×
SyntaxError (JSON)
SyncParses a truncated JSON payload as if it were an API response.
Expected message
Unexpected end of JSON input
Fired 1×
Render-phase Crash
RenderA child component throws during render, caught by the error boundary.
Expected message
InvoiceRow failed to render: lineItems is not iterable
Fired 1×
Errors by origin
8 total- Sync5
- Async2
- Render1
Error boundary probe
Render-phase crashes land here.
INV-20931
Northwind Provisions
2 line items
Session log
Cross-check each row against your reporter dashboard.
| Time | Error type | Message | Origin | Status |
|---|---|---|---|---|
| 10:31:48 | TypeError | Cannot read properties of undefined (reading 'orderId') | Sync | Uncaught |
| 10:31:12 | ReporterProbeError | Request to /api/inventory timed out after 5000ms | Async | Uncaught |
| 10:30:37 | SyntaxError | Unexpected end of JSON input | Sync | Uncaught |
| 10:29:55 | TypeError | InvoiceRow failed to render: lineItems is not iterable | Render | Handled |
| 10:29:20 | RangeError | Invalid array length | Sync | Uncaught |
| 10:28:41 | ReferenceError | checkoutSession is not defined | Sync | Uncaught |
| 10:28:09 | TypeError | Cannot read properties of undefined (reading 'orderId') | Sync | Uncaught |
| 10:27:33 | ReporterProbeError | Request to /api/inventory timed out after 5000ms | Async | Uncaught |