I did it like this with Xcode 12.0.1 and SPM 5.3: Put my metal shader file inside directory: ProjectRootDirectory/Sources/TargetName/Metal/Shaders.metal In Package.swift .target(       name: "TargetName",       dependencies: [],       resources: [.process("Metal/Shaders.metal")]  ) 3. Then I was able to load the library inside my package like this: guard let library = try? device.makeDefaultLibrary(bundle: Bundle.module)       else { fatalError("Unable to create default library") }