tsconfig.lib.json

{
  "compilerOptions": {
    // Emit declaration files for the library.
    "noEmit": false,
    "declaration": true,
    "emitDeclarationOnly": true,

    // Libraries generally require more strict type accuracy.
    // For example, its types must be compatible with the Vue types.
    // So we don't want to skip the type checking of its dependencies.
    "skipLibCheck": false,

    // See <https://www.semver-ts.org/formal-spec/5-compiler-considerations.html#strictness>
    // Part of the recommended tsconfig as of TS 5.9.
    // Flags starting with `no` are likely to have false positives,
    // So they are not suitable for existing codebases, but are recommended for new codebases,
    // as well as libraries that need to be more strict about their types.
    // See also <https://github.com/vuejs/tsconfig/issues/38#issuecomment-3524621112> for more discussion.
    "noUncheckedIndexedAccess": true,
  }
}