tsconfig.json

{
  //"extends": "astro/tsconfigs/strict",
  "extends": "astro/tsconfigs/base",
  "include": [".astro/types.d.ts", "**/*"],
  "exclude": ["dist"],
  "compilerOptions": {
    "strictNullChecks": true, // add if using `base` template
    "allowJs": true // required, and included with all Astro templates
  }
}