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# Install deno for yt-dlp JavaScript runtime
## Problem
yt-dlp now requires a JavaScript runtime for full YouTube extraction. Without it, you get this warning:
```
WARNING: No supported JavaScript runtime could be found.
YouTube extraction without a JS runtime has been deprecated, and some formats may be missing.
```
## Solution
Install deno (the default supported runtime):
```bash
sudo pacman -S deno
```
## Why
YouTube uses JavaScript for some format extraction. Without a JS runtime, yt-dlp may not be able to access all video formats or could fail on certain videos.
See: https://github.com/yt-dlp/yt-dlp/wiki/EJS
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