---
title: MARKLESS_TEMPLATE_EXPRESSION_STATIC
description: "A markup expression reads state but never updates."
sidebar: { hidden: true }
search: { keywords: ["TEMPLATE_EXPRESSION_STATIC","template expression static","markless error"] }
pagination: false
---

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

## What happened

Today, only plain reads like `{label}` update the page. This expression does more than read, so it shows its first value and never changes.

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

```text
MARKLESS_TEMPLATE_EXPRESSION_STATIC: This text reads `<readSource>`, but only plain reads like `{<readSource>}` update the page today. The expression renders its initial value and never changes when `<readSource>` changes.
Each template read compiles to a graph subscription with a DOM-update record; composite expressions are not lowered yet, so no subscription exists to wake this text.
Hoist the logic into a derived value: `const label = computed(() => a ? 'x' : 'y');` with `<p>{label}</p>`.
https://markless.dev/errors/MARKLESS_TEMPLATE_EXPRESSION_STATIC
```

Words in angle brackets change from case to case.

## How to fix it

Move the logic into `computed()` and render the result.

```tsrx
const label = computed(() => (open ? 'Hide' : 'Show'));

<button>{label}</button>
```

If you accept the warning on purpose, put this comment on the line above it:

```tsrx
// markless-allow MARKLESS_TEMPLATE_EXPRESSION_STATIC: the reason you accept it
```

## Where it comes from

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

- [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).