Compile-Time Input Validation
Reject malformed DSL expressions before runtime.
Compile-Time Input Validation
Type-level DSLs can reject malformed expressions before runtime. Using template literal and conditional types, we validate the structure of a string at the type level and refuse invalid input.
Example: A Tiny Selector Language
Imagine accepting strings like "user.name" or "order.items.length". We want to reject "user." or ".name" at compile time.
All lessons in this course
- What Is a Type-Level DSL
- Designing a Fluent Query DSL
- Compile-Time Input Validation
- Error Messages in Type-Level DSLs