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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
If you're just here for the code, just go ahead and skip to step #2, or see the code in the repository here.
Before we get started, you might not be interested in writing a custom solution for this and would rather use a package for this. If this is the case, there are tens of packages to do just this. Just search for "loading overlay", "loader overlay", or "progress hud" on pub.dev. I haven't used any personally, but loader_overlay looks well maintained and has a nice API.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.