Troubleshoot
Dev
yarn start
disable --isolatedModules enforcement
until react-script get its sh*t together and uses babel 7.15 with TS const enum
update file node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js
and disable writing JSON at line 286: writeJson(paths.appTsConfig, appTsConfig);
then set "isolatedModules": false in tsconfig.json