Pedantic index signatures in TypeScript 4.1
Read OriginalThis article discusses problems with TypeScript's index signatures where accessing non-existent properties returns undefined at runtime but isn't caught by the type checker. It introduces TypeScript 4.1's pedantic index signature checks and demonstrates how to create a SafeRecord type to ensure proper undefined handling for safer object property access.
Comments
No comments yet
Be the first to share your thoughts!
Browser Extension
Get instant access to AllDevBlogs from your browser
Top of the Week
1
Introducing GPT-5.1 for developers
Simon Willison
•
6 votes
2
🧠 Build an Agent Chat that Remembers — Persisting Conversations with Microsoft Agent Framework
Bruno Capuano
•
3 votes
3
Using A Hidden Submit Button To Ensure Unnamed Submissions
Ben Nadel
•
3 votes
4
uv+just for testing multiple Python versions
Daniel Feldroy
•
3 votes
5
ServiceNow and Microsoft Copilot
Marius Sandbu
•
2 votes
6
Cursor 2.0 and Composer Model
Codeaholicguy
•
2 votes
7
Agentic AI and Security
Martin Fowler
•
2 votes
8
Springs and Bounces in Native CSS
Josh Comeau
•
2 votes
9
Importing vs fetching JSON
Jake Archibald
•
2 votes
10
llm-anthropic 0.22
Simon Willison
•
1 votes