"'error' is not defined" when using try/catch in event handler

[trbrc]

The compiler does not appear to understand that in try {...} catch (error) {...}, error declares a new variable. Instead, it complains that 'error' is not defined.

https://svelte.dev/repl/b630939cfcc243ce8d46bfe1218dcfb4?version=3.5.3

In creating the above reproduction, I noticed it also doesn't recognise the global Error in this context.

[Conduitry]

Adding Error as a known global would just be a matter of adding it to the list in src/compiler/utils/names.ts. Teaching it about the variable declared by catch would probably be a little trickier, but hopefully not too hard, as it already knows about the variables declared via for statements for example.

[Rich-Harris]

Both fixed in 3.6.0