📝§ Package management and versioning

Package managers are dependency injection mechanisms
Implicit interface
It is preferable to have a single version of each library
- Libraries should not pin specific versions of dependencies
- Libraries should communicate dependencies’ versions constraints
  - Dependencies’ version constraints require additional maintenance work
  - Packages only use a subset of other packages’ interfaces
Interface is second-class for package managers—developers code against library’s interface, but package managers operate on versions
- Version number communicates version of the interface and of its implementation
  - Version numbers version package interface as a whole
- Packages could declare their dependencies’ interface instead of version constraint—a thought experiment

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📝 § Software Development