Typescript: JSX element type 'string' is not a constructor function for JSX elements.

[nmain]

TypeScript Version: 3.4.0-dev.20190226

Search Terms:
JSX element constructor function

Code

import * as React from "react";

function Foobaz() {
    return "Foobaz";
}
<Foobaz />;

Expected behavior:
Code compiles. This is a basic functional component that always returns a string, one of the valid things that React will render.

Actual behavior:

test.tsx:6:1 - error TS2605: JSX element type 'string' is not a constructor function for JSX elements.

I have the horrible feeling that I'm doing something incredibly stupid, but I can't see what.

Playground Link:
Playground does not support tsx.

Other Information:
tsconfig.json:

{
    "compilerOptions": {
        "jsx": "react"
    }
}

package.json deps:

  "devDependencies": {
    "@types/react": "^16.8.5",
    "react": "^16.8.3",
    "typescript": "^3.4.0-dev.20190226"
  }

Related Issues:

The phrase "JSX element type is not a constructor function for JSX elements." is very common in searches, but none of them seemed related to this.

[RyanCavanaugh]

See https://github.com/DefinitelyTyped/DefinitelyTyped/issues/20544 and related issues

[nmain]

Many thanks. At least there's another way to search for that issue now.