Cleye

Cleye is a TypeScript-first CLI development tool for Node.js that provides minimal API surface, powerful flag parsing, strongly typed parameters and flags, command support, and automatic --help documentation generation. Current stable version is 2.6.0, actively maintained with monthly releases. Unlike yargs or commander, cleye focuses on type safety and a simple, declarative API with no runtime overhead for type inference. It supports async callbacks, boolean flag negation, strict unknown flag rejection, and composable type helpers via the cleye/formats subpath. Ships its own TypeScript types.