Reason is a programming language recognized by GitHub Linguist and used with .re, .rei.
Quick facts
What is Reason
Reason is a programming language recognized by GitHub Linguist and used with .re, .rei.
GitHub Linguist classifies Reason as a programming language, typically using extensions such as .re, .rei.
File extensions:
Related languages
Frequently asked questions
Reason is a programming language recognized by GitHub Linguist and used with .re, .rei.
Common extensions include .re, .rei.
Sources & standards
Updated 2026-08-18
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