structural Verniz condition must be a checked bool

A structural v:if directive decides whether a component or native element is evaluated. Its condition must have type bool. Values of type Any, unresolved types, numbers and strings cannot supply that condition, including when ordinary type checking is disabled.

use std::html::*

let visible = true
<span v:if={visible}>ready</span>

Compare a value explicitly to express your intent:

use std::html::*

let count = 2
<span v:if={count > 0}>items available</span>

The check happens before rendering. A false condition skips the element's arguments and children.