---
title: MARKLESS_STATE_DESTRUCTURE_DEFAULT_UNSUPPORTED
description: "Graph destructuring defaults are not supported yet: a Markless compiler error."
sidebar: { hidden: true }
search: { keywords: ["STATE_DESTRUCTURE_DEFAULT_UNSUPPORTED","state destructure default unsupported","markless error"] }
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---

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

## What happened

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

```text
MARKLESS_STATE_DESTRUCTURE_DEFAULT_UNSUPPORTED: Cannot create graph alias "<localName>" from "<target>" with a default value.
A destructuring default must run only when the property value is undefined. The current graph alias artifact can represent a graph path, but not a fallback expression without changing JavaScript semantics.
Use an explicit computed() for fallback logic, or read the graph path directly without a destructuring default.
https://markless.dev/errors/MARKLESS_STATE_DESTRUCTURE_DEFAULT_UNSUPPORTED
```

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

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