fullcalendar/tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "allowJs": true,
    "noUnusedLocals": true,
    "noImplicitUseStrict": true,
    "importHelpers": true,
    "baseUrl": ".",
    "paths": {
      "fullcalendar": ["src/main"]
    }
  },
  "include": [
    "src/main.ts",
    "plugins/**/main.ts"
  ]
}