TypeScript2 min read
Advanced Generics: Overloads, Inference Tricks, and Variance
Interview-focused advanced generics: overloads, inference patterns, variance basics, and designing ergonomic typed APIs.
#Generics#Interviews
Feb 08, 2026Practice
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4 articles
Interview-focused advanced generics: overloads, inference patterns, variance basics, and designing ergonomic typed APIs.
How keyof + mapped types work, and how template literal types unlock powerful typed APIs.
Understand conditional types, infer, and how TypeScript extracts types from functions/promises/arrays.
A deep, interview-ready guide to TypeScript generics: why they exist, how inference works, constraints (extends), default generics, and practical examples used in real codebases.