Support TypeScript 4.9

[sosukesuzuki]

TypeScript 4.9 Beta has been released!

We should support new syntax.

satisfies operator

const palette = {
    red: [255, 0, 0],
    green: "#00ff00",
    bleu: [0, 0, 255]
} satisfies Record<Colors, string | RGB>;

• Babel
  • [ts] Add support for expr satisfies Type expressions babel/babel#14211
• typescript-eslint
  • TypeScript 4.9 Support typescript-eslint/typescript-eslint#5688

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Anything else?

[SaphireLattice]

Seems to depend on @typescript-eslint/typescript-estree as seen here https://github.com/prettier/prettier/blob/main/src/language-js/parse/typescript.js#L39

Same relevant issue as eslint itself

[blixt]

TypeScript 4.9 is now out but using satisfies with the latest released version of Prettier still errors:

["ERROR" - 1:58:59 PM] Error formatting document.
["ERROR" - 1:58:59 PM] ',' expected. (64:3)
  62 |     scrollSections: "on",
  63 |     textFill: "on",
> 64 | } satisfies Experiments
     |   ^
  65 |

Is there a workaround to this other than disabling Prettier for files using the keyword?

[kachkaev]

👋 @blixt! The support for satisfies will be added in Prettier 2.8, you can track the release process here: #13792.

The PR for new syntax is already merged: #13783

[sosukesuzuki]

Prettier 2.8 that supports satisfies operator has been released! https://prettier.io/blog/2022/11/23/2.8.0.html

[sosukesuzuki]

Auto-Accessor Syntax will be supported in the near future. Please wait.

[sosukesuzuki]

2.8.1 has been released

[carpben]

Seems like there is still an issue.

If we remove the casting, or cast with as const issue is resolved.
Can we open this?