---
title: MARKLESS_EVENT_SPREAD_UNSUPPORTED
description: "Event handlers cannot be spread onto an element: a Markless compiler error."
sidebar: { hidden: true }
search: { keywords: ["EVENT_SPREAD_UNSUPPORTED","event spread unsupported","markless error"] }
pagination: false
---

**Error** from the compiler, while it builds your `.tsrx` files.

## What happened

Markless prints the message, the reason, and a suggestion:

```text
MARKLESS_EVENT_SPREAD_UNSUPPORTED: {...<spreadSource>} spreads <listed> onto an element. Events compile to static view records, so handlers inside a spread would be discarded.
The compiler owns event discovery so the browser can resume without scanning markup; a runtime spread hides which events exist from the compiler.
Write event props directly, for example <input onClick={handlers.onClick} onInput={handlers.onInput} />, and keep spreads for plain static attributes.
```

Words in angle brackets change from case to case.

## How to fix it

Start with the suggestion in the message above.

This page has no guide yet. [Help write it](/contributing/improve-these-docs).

## Where it comes from

`@markless/compiler` raises this code. Source:

- [packages/compiler/src/passes/semantic-graph/diagnostics.ts](https://github.com/compiled-run/markless/blob/main/packages/compiler/src/passes/semantic-graph/diagnostics.ts)

Read [how to read a Markless error](/tooling/diagnostics), or go back to [all error codes](/errors).