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yants

Build Status

This is a tiny type-checker for data in Nix, written in Nix.

Features:

  • Checking of primitive types (int, string etc.)
  • Checking polymorphic types (option, list, either)
  • Defining & checking struct/record types
  • Defining & matching enum types
  • Defining & matching sum types
  • Defining function signatures (including curried functions)
  • Types are composable! option string! list (either int (option float))!
  • Type errors also compose!

Lacking:

  • Any kind of inference
  • Convenient syntax for attribute-set function signatures

Primitives & simple polymorphism

simple

Structs

structs

Nested structs!

nested structs

Enums!

enums

Functions!

functions