React 17 JSX, react-scripts with TypeScript

import React from "react";

export default function TestPara() {
  return (
    <React.Fragment>
      <h1>I love FOSS</h1>
    </React.Fragment>
  );
}

import { Fragment } from "react";

export default function TestPara() {
  return (
    <Fragment>
      <h1>I love FOSS</h1>
    </Fragment>
  );
}

yarn add typescript@beta

"jsx": "react-jsx"

.../node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js:239
      appTsConfig.compilerOptions[option] = value;
                                          ^

TypeError: Cannot assign to read only property 'jsx' of object '#<Object>'
    at verifyTypeScriptSetup (.../node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js:239:43)
    at Object.<anonymous> (.../node_modules/react-scripts/scripts/start.js:31:1)
...

    let result;
    parsedTsConfig = immer(readTsConfig, config => {
      result = ts.parseJsonConfigFileContent(
        config,
        ts.sys,
        path.dirname(paths.appTsConfig)
      );
    });

    parsedTsConfig = {...readTsConfig};

    const result = ts.parseJsonConfigFileContent(
      parsedTsConfig,
      ts.sys,
      path.dirname(paths.appTsConfig)
    );