sharepoint-extensions
There are 4 repositories under sharepoint-extensions topic.
pnp/sp-dev-fx-extensions
Code samples and developer content targeted towards SharePoint Framework client-side extensions. https://aka.ms/spfx-extensions
SumitKanchan4/SPFx-Export-SPList-To-Word
This is a SharePoint Framework Extension - List view command set, which exports the SharePoint list to the Microsoft Word document
giuleon/js-application-analytics
In this sample is possible to see how to implement Google Analytics through SPFx Extensions Application Customizers. http://www.delucagiuliano.com
olgamarti/spfx-extensions-samples
Samples with SPFx Extensions for SharePoint