Stefan Baumgartner • 7/6/2021

TypeScript: Array.includes on narrow types

Read Original

This article discusses a specific TypeScript typing challenge where using Array.includes on an array with a narrow type (e.g., from a const assertion) causes a type error. It explains why the error occurs by examining the type definitions and provides context for when this situation arises and potential solutions.

0 comments
#TypeScript #includes #type narrowing
TypeScript: Array.includes on narrow types

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
Using Browser Apis In React Practical Guide
Jivbcoop • 2 votes
2
Better react-hook-form Smart Form Components
Maarten Hus • 2 votes
3
Top picks — 2026 January
Paweł Grzybek • 1 votes
4
In Praise of –dry-run
Henrik Warne • 1 votes
5
Deep Learning is Powerful Because It Makes Hard Things Easy - Reflections 10 Years On
Ferenc Huszár • 1 votes
6
Vibe coding your first iOS app
William Denniss • 1 votes
7
AGI, ASI, A*I – Do we have all we need to get there?
John D. Cook • 1 votes
8
Quoting Thariq Shihipar
Simon Willison • 1 votes
9
Dew Drop – January 15, 2026 (#4583)
Alvin Ashcraft • 1 votes