Function parameter hover info is inconsistent between contexts

🔎 Search Terms

“hover”

🕗 Version & Regression Information

• This changed between versions 5.4 and 5.5

⏯ Playground Link

https://www.typescriptlang.org/play/#code/PTAEFUGcFMCdQCbQGYEsB20Gg5VTQBZAEQA1Q0AbaSAOlAHVpEB7dQTAIAXUAYzc9gtKoTgAtUdAFCcAngAdmABUFzIoALygA3pNB7QkFgFtoylnIBcBgRgDmkgL6TJIUAEl0nOOgCGw0dCUCvCyCrTS8swkpADC-NCeZqoaoElqAGTafEZybAmckAD8VloOTpLIAK7oPJyobERkcZ75ABRyKpAlsNA+CGyUMqAA2gDSOOigANbQMizIjbHxiZ0AulbRzV4r5pBjqw4AlNq6+q76F5egAHqFp3quACoBIpFq86AduzhqHdCcslAAHcApNRCwAG5wOygSFwT6dRzOTbLTguMC3dGgZ7MULMD5fZISUCVWyDYGg0DgqGwGFw+AolqeLExHyTIHMIw+GYicS-HoAoY+NQcyiUQqpHrIOA+ABG5KBqDELEq3AwAhYCEqPBh6rgJgQqB8XipgWCrwUUiAA

💻 Code

// User defined inside MDX files. We don’t control this.
type Props = {
    someProp: string
}

// Internal helper type.
type MDXContentProps = Props & {components?: {}}

function MDXContent(props: {readonly [K in keyof MDXContentProps]: MDXContentProps[K]}) {
    //              ^?
    // The types of props is pretty when hovering over props
}

MDXContent
// ^?
// The type of props is ugly when hovering over MDXContent
// Can we make this pretty as well? Preferably without introducing intermediate helper types.

🙁 Actual behavior

Hovering over MDXContent shows the type of the props as written.

🙂 Expected behavior

Hovering over MDXContent shows a pretty formatted type of the props, just like TypeScript 5.4.

Additional information about the issue

I initially asked for help on Twitter to prettify this, not realizing this was a regression in TypeScript 5.5.

Later in the thread I was asked to report this bug.

Riproduci la differenza dell'hover usando il TypeScript Playground collegato e l'esempio MDXContent fornito, confrontando l'hover della dichiarazione di funzione con l'hover del riferimento alla funzione. Traccia il percorso di visualizzazione dell'hover per i tipi mappati e readonly; il lavoro è completato quando passando il mouse su MDXContent viene mostrato lo stesso tipo di props formattato di TypeScript 5.4.