Emacs Lisp Type Checking Macro: declare-type
2025-05-04
This article introduces `declare-type`, an Emacs Lisp macro for runtime type checking of function arguments. Leveraging the advice mechanism, it adds type checks before function execution. `declare-type` supports optional arguments and complex type specifications, detecting insufficient arguments or type mismatches. While currently lacking support for type variables and sophisticated type relationships, it provides robust basic type checking for improved Emacs Lisp code safety.
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