MARKLESS_OVERLAY_VALUE_UNSUPPORTED

overlay accepts only a literal: a Markless compiler error.

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

What happened

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

MARKLESS_OVERLAY_VALUE_UNSUPPORTED: <bound>. overlay must be written on the element itself as bare `overlay`, `overlay={true}`, or `overlay={false}`.
Elevation is structural, not reactive. The overlay record carries no inputs, so it has no dependencies and can never re-run; a value that varies at runtime would have nothing to re-elevate the element.
Let `@if` decide whether the element exists and keep `overlay` a literal on the element inside the branch.
https://markless.dev/errors/MARKLESS_OVERLAY_VALUE_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.

Where it comes from

@markless/compiler raises this code. Source:

• packages/compiler/src/passes/semantic-graph/diagnostics.ts

Read how to read a Markless error, or go back to all error codes.