Property '_' does not exist on type 'HtmlFormTag'

[warcayac]

I have a backend server with TSX, when using "_" attribute in any component of my app I always get an error message similar to this:

Property '_' does not exist on type 'HtmlFormTag'

For example this code:

export function HSversion({ path }: TProps) {
  return (
    <Layout>
      <>
        <form 
          hx-encoding='multipart/form-data' 
          hx-post={path}
          _='on htmx:xhr:progress(loaded, total) set #progress.value to (loaded/total)*100'
          style="margin-top: 1em;"
        >
          <input type='file' name='file' accept={fileExts}/>
          <p/>
          <button>Upload</button>
          <progress id='progress' value='0' max='100'></progress>
        </form>
      </>
    </Layout>
  )
}

This is its error:

Type '{ children: Element[]; "hx-encoding": string; "hx-post": string; _: string; style: string; }' is not assignable to type 'HtmlFormTag'.
  Property '_' does not exist on type 'HtmlFormTag'.ts(2322)

I created global.d.ts file in app root, and tried with this content:

interface HTMLElement {
  _?: string;
}

or this content

declare global {
  namespace JSX {
    interface IntrinsicElements {
      '_'?: {
        _: string;
      };
    }
  }
}

it seems not to work, how to fix it?