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Yup, you read it right. Validations can be added to the properties in the web part property pane of an SPFx webpart. The validation function can be Synchronous as well as Asynchronous. This means that we can immediately determine whether a property is valid or we can make an HTTP request (e.g. to SharePoint) and then determine if a property is valid depending on the response.In the following code, I have added a validation to the title property to make sure that it is not the same as the Sh…
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