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Mert Özen's blog posts on software development, backend, frontend, and DevOps.

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.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12

1 posts found #excess-property-checking

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Frontend PART 06

Object Types in TypeScript: Optional and readonly Properties and Index Signatures

Inline object types, optional and readonly properties, index signatures, Record, and the fresh object literal rule behind excess property checking: why TypeScript only sometimes catches extra properties.

3 Nov 2026 7 min 1