I am new to SharePoint development, and in need to create a custom side panel (with React), when click on item of list view.
Is it possible to use React JS while developing SPFx extension?
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Short answer to your question is Yes.
I already solved the problem. When I tried to create the project with the current version of yeoman and in this version yeoman put an old version of gulp in the project. When he tried to import react 16, the old version of this gulp requested react in the wrong way. I solved this issue by developing my project into an existing spfx sample project available on spfx github