David Blass (@ssalbdivad.dev) teaches the two fools about ArkType and its 1:1 validator type system. If you, like us, thought ArkType was only about validation, think again! David pulls back the curtain on what makes ArkType unique, how he built a type-level parser to provide helpful error messages, and why ArkType can provide soundness guarantees that go beyond even what vanilla TypeScript can offer. *waves hand* These are the array intersections you're looking for.

Chapters

(00:00) - Introducing David Blass
(02:39) - ArkType vs. Zod
(04:28) - ArkType's Differences
(06:21) - Defining ArkType Types
(10:33) - Matching TypeScript's Syntax
(14:24) - Detailed Editor-time Errors
(17:14) - Type-level Testing with attest
(18:26) - Runtime Error Checking
(21:05) - Generating JIT-optimized Code
(27:27) - Benchmarking ArkType's Performance
(29:41) - Optimizing the Parser for ArkType Types
(32:13) - Tips for Optimizing TypeScript Types
(38:12) - Type Mapping API
(40:20) - Set-based APIs
(43:15) - Typing Array and Tuple Intersections
(45:57) - ArkType's Internal Type System
(49:01) - Serializing Types to JSON
(50:09) - Porting Enhancements to TypeScript
(51:55) - Compatibility with Standard Schema Spec
(57:15) - Introspecting ArkType Types
(01:00:10) - Use Cases for ArkType
(01:03:34) - What's Next for ArkType?
(01:05:59) - Getting Started with ArkType
(01:07:56) - Where to Follow David

Resources

Where to Follow David

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Music
Seahorse Dreams by Kubbi (Spotify)

ArkType is TypeScript's 1:1 Validator | David Blass | Ep 35B