formdata event not found in defaut typings

[arackaf]

Describe the bug

If you try to do on:formdata={formDataEventHandler} on a form, it works, but TypeScript yells at you, being apparently unaware such an event exists.

The error is

Argument of type '{ action: string; "on:formdata": (evt: any) => void; }' is not assignable to parameter of type 'HTMLProps<"form", HTMLAttributes>'.
Object literal may only specify known properties, and '"on:formdata"' does not exist in type 'HTMLProps<"form", HTMLAttributes>'

What makes this especially irksome is that there doesn't appear to be any way to @ts-ignore TS errors in markup, though if anyone knows how, I'd love to learn

Reproduction

Grab a TypeScript module, and do

<form action="/books" on:formdata={onFormData}>

and then look at the error

Logs

N/A

System Info

System:
    OS: macOS 13.0.1
    CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
    Memory: 271.92 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 16.11.1 - /usr/local/Cellar/nvm/0.38.0/versions/node/v16.11.1/bin/node
    Yarn: 1.22.17 - /usr/local/Cellar/nvm/0.38.0/versions/node/v16.11.1/bin/yarn
    npm: 8.18.0 - ~/Documents/node_modules/.bin/npm
  Browsers:
    Chrome: 108.0.5359.94
  npmPackages:
    @sveltejs/adapter-auto: next => 1.0.0-next.89 
    @sveltejs/kit: ^1.0.0-next.570 => 1.0.0-next.570 
    svelte: ^3.44.0 => 3.53.1 
    vite: ^3.1.0 => 3.2.4

Severity

annoyance

Additional Information

No response

[Rich-Harris]

Transferred to https://github.com/sveltejs/language-tools

[mustofa-id]

This seems to be an issue for sveltejs/language-tools

For workaround, you need to define it as custom type in additional-svelte-jsx.d.ts file as describe here.

[mustofa-id]

appologize github doesn't tell me if there are already comments as I type.

[arackaf]

@mustofa-id thank you so much!