https://github.com/pnp/sp-dev-fx-webparts/tree/master/samples/react-list-form
Sample: #react-list-form
Author: @DanyWyss
List form should perform validation of all required fields before saving
List form saving the form without any validation of required fields
If I leave "Title" field empty, it just shows me message as "Item Added Successfully" after click on save button

Steps to reproduce the behavior:

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Hi @hugoabernier, I will look into this issue. Could you please assign my name?
Thank you @Harshagracy, you are now assigned!
Thank you @Harshagracy for fixing the issue 馃憤 and @hugoabernier for merging! 馃憤
Would be nice to have unsupported fields supported in future as well! :)
Most helpful comment
Thank you @Harshagracy, you are now assigned!