Support TypeScript 5.0

[sosukesuzuki]

We should support new syntax will be landed in TS 5.0.

parsers status:

• typescript-eslint
  • TypeScript 5.0 Support typescript-eslint/typescript-eslint#6380
• Babel
  • TypeScript 5.0 features babel/babel#15374
  • Babel 7.21.0 features #14390

Decorators

class Person {
    name: string;
    constructor(name: string) {
        this.name = name;
    }

    @loggedMethod
    greet() {
        console.log(`Hello, my name is ${this.name}.`);
    }
}

const p = new Person("Ray");
p.greet();

const Type Parameters

type HasNames = { names: readonly string[] };
function getNamesExactly<const T extends HasNames>(arg: T): T["names"] {
    return arg.names;
}

export type *

export type * as vehicles from "./spaceship";

[fisker]

Build script update #13819

[nandorojo]

Sorry to ping this issue, but to confirm, is there an experimental version published anywhere that has TypeScript 5.0 support yet? Couldn't find it in the releases, so figured I would ask just in case.

Judging by the checklist at the top: Babel support has been merged, and TypeScript ESlint support is released, albeit somewhat experimental. The TS ESLint version has been working for me, though.

Thanks!

[sosukesuzuki]

Sorry to ping this issue, but to confirm, is there an experimental version published anywhere that has TypeScript 5.0 support yet?

No, we haven't published the release that supports TypeScript 5.0. We will let you know in this issue when we release it, so please wait.

[sssyed]

hey folks sorry to bump this again, since #13819 has been merged and TS 5.0 is out will we see a release soon?

[fisker]

https://github.com/prettier/prettier/releases/tag/2.8.5