How can I get the RenderError error content in it after render('index.liquid')?

[maiyuanrdt]

How can I get the RenderError error content in it after render('index.liquid')?

When some tags or filters are parsed abnormally, they want to get the abnormal content and mix it into the final html result, so that the page can report the error message to the front-end template friendly.

Tried to use catch, it didn't work
render('index.liquid').catch(e => e.message)

try{
renderSync('index.liquid')
} catch(e) {
e.message
}

[harttle]

It should work. Could you provide a runnable demo for this problem? LiquidJS Playground does a similar work, when you visit https://liquidjs.com/playground.html#eyUgYXNzaWduCg==,e30= it calls render and catches any render error.