Invalid code generated when using double quotes in prop expressions

[geigerzaehler]

The following Svelte code produces invalid TypeScript code when using svelte-check v1.5.0

<Button on:click={() => null} placeholder={"placeholder value"} />

This is the produced code (from the online REPL)

///<reference types="svelte" />
<></>;function render() {
<><Button  placeholder={"placeholder value"} />{/*Ωignore_startΩ*/new Button({target: __sveltets_any(''), props: {'placeholder':placeholder value}})/*Ωignore_endΩ*/.$on('click', () => null)}
</>
return { props: {}, slots: {}, getters: {}, events: {} }}

export default class extends createSvelte2TsxComponent(__sveltets_partial(__sveltets_with_any_event(render))) {
}

As you can see, the double quotes around "placeholder value" are not preserved and the code becomes invalid. This used to work with svelte-check v1.4.0.

Obviously there’s a workaround and the the code should be written

<Button on:click={() => null} placeholder="placeholder value" />