Cannot compile code using abstract construct signatures (typescript 4.2)

[christopherswenson]

react-scripts with the cra-template-typescript does not seem to support some features of typescript 4.2. Specifically I get an error when using abstract construct signatures.

Does react-scripts just not support typescript 4.2 yet?

Reproduce

1. yarn create react-app ts42test --template typescript
2. Change typescript version in package.json to ^4.2.4
3. Add type Constructor<T = {}> = abstract new (...args: any[]) => T; somewhere
4. yarn start

./src/App.tsx
SyntaxError: /ts42test/src/App.tsx: Missing semicolon (5:35)

  3 | import './App.css';
  4 |
> 5 | type Constructor<T = {}> = abstract new (...args: any[]) => T;
    |                                    ^
  6 |
  7 | function App() {
  8 |   return (

[christopherswenson]

For the record, some other TS 4.2 features seem to work, e.g. the following

type Foo = [...number[], string];

[christopherswenson]

It seems I can get it to work by adding the following to my package.json.

"resolutions": {
    "@typescript-eslint/typescript-estree": "4.24.0",
    "typescript": "^4.2",
    "@typescript-eslint/eslint-plugin": "^4.24.0",
    "@typescript-eslint/parser": "^4.24.0",
    "@babel/core": "7.13.0"
  }

I probably just don't understand this ecosystem well enough yet, but it seems like I shouldn't have to do this.

[stale]

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