README.md

NIO Dependency Analysis

This repository contains the scripts to answer the question: if NIO was to drop Swift 5.0 and 5.1, how many of its dependencies would be affected?

Links

• original question: "Is anybody still using SwiftNIO or anything that uses SwiftNIO on Swift 5.0 or 5.1 in production?"
  • https://twitter.com/johannesweiss/status/1397877338277351426?s=21
• https://twitter.com/_sa_s/status/1398286782807035910?s=21
• https://github.com/SwiftPackageIndex/nio-dependency-analysis

Process

Steps to perform analysis:

• run nio-analysis.swift in the checkouts directory containing all package checkouts (copy from builder)
  • loop over package checkouts
  • open Package.resolved to see if NIO is among the dependencies
    • if there is no Package.resolved, run swift package dump-package first
  • log NIO-dependents
• compatibility.sql
  • run SQL snippets to compile lists of packages compatible with certain Swift versions
• playground.sql
  • copy in results from nio-analysis.swift into nioDependees
  • copy in results from compatibility.sql into the compatible_5_x constants
  • run playground to compute the compatibility table