The process of building custom applications and tools that interact with Microsoft SharePoint, including SharePoint Online in Microsoft 365.
Hi @daryush salahshur ,
SharePoint 2019 supports SharePoint Framework client-side web parts hosted on classic or modern SharePoint pages built by using the SharePoint Framework v1.4.1. SharePoint 2019 also supports SharePoint Framework extensions hosted on modern SharePoint pages built using SharePoint Framework v1.4.1. So SharePoint Framework v1.4.1 and gulp, node version support spfx 1.4.1 is required mentioned in the document
https://learn.microsoft.com/en-us/sharepoint/dev/spfx/sharepoint-2019-support
Here is sample for react:
https://pnp.github.io/sp-dev-fx-controls-react/controls/PeoplePicker/
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