tsconfig.json

{
  "compilerOptions": {
    // Enable top-level await, and other modern ESM features.
    "target": "ESNext",
    "module": "ESNext",
    // Enable node-style module resolution, for things like npm package imports.
    "moduleResolution": "node",
    // Enable JSON imports.
    "resolveJsonModule": true,
    // Enable stricter transpilation for better output.
    "isolatedModules": true,
    "types": ["node", "unist", "unified"],

    "allowJs": true,

    "noImplicitAny": true,

    "baseUrl": ".",
    "paths": {},

    "allowSyntheticDefaultImports": true,

    "importsNotUsedAsValues": "error",

    "strictNullChecks": true,

    "declaration": true,
    "outDir": "./dist"
  },

  "include": ["./index.ts"]
}