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 ```typescript 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; ```