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Posts tagged “extends”

2 posts found

TypeScript interface Extends vs Intersection: When the Difference Actually Breaks Your Code

TypeScript interface Extends vs Intersection: When the Difference Actually Breaks Your Code

October 2, 2026

Most TypeScript type errors come from misunderstanding when extends catches conflicts that & silently permits. Learn the declaration-time versus use-time distinction that determines whether your code compiles or fails at runtime.

typescriptinterfaceintersection types+2
TypeScript Generic Constraints in Depth: `extends`, `keyof`, and the Patterns That Prevent Runtime Errors

TypeScript Generic Constraints in Depth: `extends`, `keyof`, and the Patterns That Prevent Runtime Errors

July 18, 2026

Master TypeScript generic constraints with extends and keyof to eliminate runtime errors. Learn the patterns production codebases rely on for type-safe property access and API design.

typescriptgenericstype safety+2