Swift Package Manager

We use the Swift Package Manager (SPM) to manage the distribution of Swift projects. The Swift package manager integrates the package dependencies into the Swift build system, automating the downloading, compiling, and linking the other packages that are required in a Swift project. In a typical Swift project, the source code is organized into packages. We use the Swift package manager to set up target executable modules in a project and specify each executable's dependent modules. An executable is a Swift program that can be run by the host's platform. For example, we build one executable module for product release and another executable module for testing.