can't find name const in latest typescript

[tjx666]

typescript: 4.7.0-dev.20220327
vscode: 1.66.0-insider

reproduce:

1. install extension JavaScript and TypeScript Nightly
2. toggle to latest typescript
3. copy following code
4. restart vscode

class Tex {
 type = 'Text' as const;
}

class Svg {
 type = 'Svg' as const;
}

const map = {
 text: Tex,
 svg: Svg
}

type M = typeof map;

export function bar<T extends keyof M>(type: T): M[T] {
 const s = map[type];
 return s;
}

const cons = bar('text');
const a = new cons();
const t = s.type;

[exbotanical]

I'm seeing this as well. Temporary fix is to change the version via the command palette (works for me with 4.6.3).

[RyanCavanaugh]

Bisected to #36747