The success of JSX has proved that the second curly is unnecessary. Moreover, a lot of people — particularly those who have been exposed to React — have a visceral negative reaction to double curlies, many of them assuming that it brings with it all the limitations of crusty old languages like Mustache and Handlebars, where you can't use arbitrary JavaScript in expressions.

const { getByRole } = render(<input bind_value={text}>)

svelte-htm - Hyperscript Tagged Markup for svelte; a jsx-like syntax using Tagged Templates

For event listeners we support the standard jsx naming convention onEventname (this is converted to on:eventname in svelte) as well.

Write svelte components in jsx.

This package exposes an hyperscript compatible function: h(tag, properties, ...children) which returns a svelte component.