improve ScriptingCore

Author: stevapple

Sources/ScriptingCore/Models.swift

@@ -20,7 +20,7 @@ public struct PackageModel: Codable {
     let path: AbsolutePath?
     /// The URL of a remote package.
     let url: Foundation.URL?
-    /// The user-defined name for a local package.
+    /// The user-defined name for a package.
     private let _name: String?
 
     /// The resolved name of the package.
@@ -34,7 +34,7 @@ public struct PackageModel: Codable {
         } else if let url = url {
             name = url.pathComponents.last!.spm_dropGitSuffix()
         } else {
-            fatalError()
+            preconditionFailure("Invalid package model")
         }
         return name
     }