The appeal of bidirectional type-checking

This page summarizes the projects mentioned and recommended in the original post on /r/haskell

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  • grace

    A ready-to-fork interpreted functional language with type inference (by Gabriella439)

    My Grace project has a reference implementation of a bidirectional type-checker, so you can test drive it using the REPL:

  • DoubleApplication

    github

  • 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.

  • ghc-proposals

    Proposed compiler and language changes for GHC and GHC/Haskell

    The "quick look impredicativity" paper (although not the GHC proposal) mentions bidirectionality a few times.

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.

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