runjs

Install command: 
brew install --cask runjs

Name: RunJS

JavaScript playground that auto-evaluates as code is typed

https://runjs.app/

Cask JSON API: /api/cask/runjs.json

Cask code: runjs.rb on GitHub

Current version: 3.0.3

Current version requires: macOS >= 10.15

Analytics:

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runjs 45
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runjs 128
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runjs 673
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