Typing correctly matters
summary
Guidelines emphasize concrete techniques: prefer TypeScript inference over manual annotations, replace optional fields with union types and discriminated unions, and use an assertNever helper so adding a new case fails compilation. For untrusted input generate and validate with JSON Schema to get runtime checks and exact typings, and wrap database rows with ES6 proxies that throw on undefined fields so the declared row type matches queried columns. These practices catch mismatches that types alone miss.
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chapters (5)
- 0:00Start
- 0:14Typescript types are statically checked constraints
- 1:58Use discriminated unions
- 3:00Adding runtime checks
- 4:06Leverage Typescript's ability to infer
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