Typeof on Dev & Platform Engineering Hub

TS Ep 28: The `typeof` Type Operator (Value to Type Space)

Sun, 09 Aug 2026 11:30:00 +0000

An in-depth guide to the typeof operator in Type Space. Learn the distinction between Value Space and Type Space, reverse-engineering types from runtime objects and functions, combining keyof typeof, and deriving single-source-of-truth types.

TS Ep 9: Type Narrowing & Control Flow Analysis

Sun, 09 Aug 2026 10:40:00 +0000

Understand how TypeScript’s Control Flow Analysis engine refines types across code branches. Master typeof guards (and the typeof null quirk), instanceof class narrowing, the ‘in’ property operator, equality narrowing, and truthiness pitfalls.