typespec-functions

What problem does it solve?

TypeSpec functions let you declare extern fn declarations and provide JavaScript backends via $functions, enabling dynamic type logic, value computation, and higher-order patterns in TypeSpec code.

Core Features & Use Cases

• Declare extern fn that compute and return types or values
• Implement function backends via the $functions export for clean JS bindings
• Use function types for higher-order patterns and type transformations
• Transform types without mutating existing instances and compute defaults with arbitrary JS logic
• Build libraries that accept function-valued parameters and templates

Quick Start

Declare an extern fn and bind a JS implementation via $functions to implement a new type transformation