Cache the domains

[jonluca]

This caches the domains to prevent reading from disk every time

[deepsource-io]

Here's the code health analysis summary for commits 77bd574..5b21167. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	❌ Failure	❗ 1 occurence introduced	View Check ↗

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[IntegerAlex]

Thankyou for your contribution, I didn't know developers are using it.
I am updating index.json too.