To get the versions of your SPM packages

README.md

Example

At runtime

   SPMVersions.versionOf("THE_PACKAGE_ID")

In Terminal

cat ./YourAdHere.xcworkspace/xcshareddata/swiftpm/Package.resolved | \
jq '.pins[] | select(.identity == "THE_PACKAGE_ID").state.version'

build phase

/* Begin PBXShellScriptBuildPhase section */
		07E370312A14208C0035FB2F /* Generate spm_versions.json */ = {
			isa = PBXShellScriptBuildPhase;
			buildActionMask = 2147483647;
			files = (
			);
			inputFileListPaths = (
			);
			inputPaths = (
				"$(PROJECT_FILE_PATH)/project.xcworkspace/xcshareddata/swiftpm/Package.resolved",
			);
			name = "Generate spm_versions.json";
			outputFileListPaths = (
			);
			outputPaths = (
				$TARGET_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/spm_versions.json,
			);
			runOnlyForDeploymentPostprocessing = 0;
			shellPath = /bin/sh;
			shellScript = "OUTPUT=\"$TARGET_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/spm_versions.json\"\ncat \"$PROJECT_FILE_PATH\"/project.xcworkspace/xcshareddata/swiftpm/Package.resolved | jq '[ .pins[] | { id: .identity, vers: .state.version }]' > \"$OUTPUT\"\n\necho built $OUTPUT\n";
			showEnvVarsInLog = 0;
		};
/* End PBXShellScriptBuildPhase section */

SPMVersions.swift

class SPMVersions {

    private struct SPMPackage: Decodable {
        let id: String
        let vers: String
    }
 
    private static let packages: [SPMPackage] = {
        let logger = print // or whatever

        guard let filePath = Bundle.main.path(forResource: "spm_versions", ofType: "json") else {
            logger("spm_versions.json not found, should have been created in a build phase")
            return []
        }
        var result = [SPMPackage]()
        do {
            if let jsonData = try String(contentsOfFile: filePath).data(using: .utf8) {
                result = try JSONDecoder().decode([SPMPackage].self, from: jsonData)
            }
        } catch {
            logger("failed to decode spm_versions.json, error: \(error)")
        }
        return result
    }()
    
    static func versionOf(_ packageName: String) -> String? {
        packages.first { $0.id == packageName }?.vers
    }


}