Function invariant

scripts/experimental.ts:136–138

(cond: unknown, message: string)

// --- Utilities ---

function invariant(cond: unknown, message: string): asserts cond {
  if (!cond) throw new Error(message);
}

function readPackageJson(packageDirName: string): Record<string, unknown> {
  let file = path.join(rootDir, "packages", packageDirName, "package.json");