fullcalendar/packages/common/tsconfig.json

{
  "extends":  "../../tsconfig.base",
  "compilerOptions": {
    "rootDir": "src",
    "outDir": "tsc"
  },
  "include": [
    "src/**/*"
  ],
  "references": [
    { "path": "../core-preact" }
  ]
}