diff --git a/Example/KnitExample.xcodeproj/project.pbxproj b/Example/KnitExample.xcodeproj/project.pbxproj
index fa214e7..e2958ef 100644
--- a/Example/KnitExample.xcodeproj/project.pbxproj
+++ b/Example/KnitExample.xcodeproj/project.pbxproj
@@ -239,7 +239,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "/usr/bin/xcrun --sdk macosx swift run knit gen \\\n--assembly-input-path KnitExample/KnitExampleAssembly.swift \\\n--assembly-input-path KnitExample/KnitExampleUserAssembly.swift \\\n--type-safety-extensions-output-path KnitExample/KnitDITypeSafety.swift \\\n--unit-test-output-path KnitExampleTests/KnitDIRegistrationTests.swift\n";
+			shellScript = "/usr/bin/xcrun --sdk macosx swift run knit-cli gen \\\n--assembly-input-path KnitExample/KnitExampleAssembly.swift \\\n--assembly-input-path KnitExample/KnitExampleUserAssembly.swift \\\n--type-safety-extensions-output-path KnitExample/KnitDITypeSafety.swift \\\n--unit-test-output-path KnitExampleTests/KnitDIRegistrationTests.swift\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 
diff --git a/Example/KnitExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/Example/KnitExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
index 86fdbdc..6082bc9 100644
--- a/Example/KnitExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+++ b/Example/KnitExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
@@ -14,8 +14,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-syntax.git",
       "state" : {
-        "revision" : "2c49d66d34dfd6f8130afdba889de77504b58ec0",
-        "version" : "508.0.1"
+        "revision" : "6ad4ea24b01559dde0773e3d091f1b9e36175036",
+        "version" : "509.0.2"
       }
     },
     {
diff --git a/Example/KnitExample/KnitExampleApp.swift b/Example/KnitExample/KnitExampleApp.swift
index 6f03c94..96372c6 100644
--- a/Example/KnitExample/KnitExampleApp.swift
+++ b/Example/KnitExample/KnitExampleApp.swift
@@ -1,7 +1,7 @@
 // Copyright © Square, Inc. All rights reserved.
 
 import SwiftUI
-import Knit
+import KnitLib
 
 @main
 struct KnitExampleApp: App {
diff --git a/Example/KnitExample/KnitExampleUserAssembly.swift b/Example/KnitExample/KnitExampleUserAssembly.swift
index b7caff1..7c8aac5 100644
--- a/Example/KnitExample/KnitExampleUserAssembly.swift
+++ b/Example/KnitExample/KnitExampleUserAssembly.swift
@@ -1,7 +1,7 @@
 // Copyright © Square, Inc. All rights reserved.
 
 import Foundation
-import Knit
+import KnitLib
 
 // @knit internal getter-named
 /// An assembly expected to be registered at the user level rather than at the app level
diff --git a/Sources/KnitCodeGen/AssemblyParsing.swift b/Sources/KnitCodeGen/AssemblyParsing.swift
index e1b8a13..59d768b 100644
--- a/Sources/KnitCodeGen/AssemblyParsing.swift
+++ b/Sources/KnitCodeGen/AssemblyParsing.swift
@@ -2,7 +2,7 @@ import Foundation
 import SwiftSyntax
 import SwiftParser
 
-public func parseAssemblies(at paths: [String]) throws -> ConfigurationSet {
+public func parseAssemblies(at paths: [String], defaultTargetResolver: String) throws -> ConfigurationSet {
     var configs = [Configuration]()
     for path in paths {
         let url = URL(fileURLWithPath: path, isDirectory: false)
@@ -15,7 +15,11 @@ public func parseAssemblies(at paths: [String]) throws -> ConfigurationSet {
             throw AssemblyParsingError.fileReadError(error, path: path)
         }
         let syntaxTree = Parser.parse(source: source)
-        let configuration = try parseSyntaxTree(syntaxTree, errorsToPrint: &errorsToPrint)
+        let configuration = try parseSyntaxTree(
+            syntaxTree,
+            errorsToPrint: &errorsToPrint,
+            defaultTargetResolver: defaultTargetResolver
+        )
         configs.append(configuration)
         printErrors(errorsToPrint, filePath: path, syntaxTree: syntaxTree)
     }
@@ -24,7 +28,8 @@ public func parseAssemblies(at paths: [String]) throws -> ConfigurationSet {
 
 func parseSyntaxTree(
     _ syntaxTree: SyntaxProtocol,
-    errorsToPrint: inout [Error]
+    errorsToPrint: inout [Error],
+    defaultTargetResolver: String
 ) throws -> Configuration {
     let assemblyFileVisitor = AssemblyFileVisitor()
     assemblyFileVisitor.walk(syntaxTree)
@@ -41,7 +46,7 @@ func parseSyntaxTree(
         registrations: assemblyFileVisitor.registrations,
         registrationsIntoCollections: assemblyFileVisitor.registrationsIntoCollections,
         imports: assemblyFileVisitor.imports,
-        targetResolver: assemblyFileVisitor.targetResolver
+        targetResolver: assemblyFileVisitor.targetResolver ?? defaultTargetResolver
     )
 }
 
@@ -68,8 +73,8 @@ private class AssemblyFileVisitor: SyntaxVisitor {
         return classDeclVisitor?.registrationErrors ?? []
     }
 
-    var targetResolver: String {
-        return classDeclVisitor?.targetResolver ?? "Resolver"
+    var targetResolver: String? {
+        return classDeclVisitor?.targetResolver
     }
 
     init() {
diff --git a/Sources/KnitCommand/GenCommand.swift b/Sources/KnitCommand/GenCommand.swift
index 29edc07..64b4055 100644
--- a/Sources/KnitCommand/GenCommand.swift
+++ b/Sources/KnitCommand/GenCommand.swift
@@ -40,12 +40,15 @@ struct GenCommand: ParsableCommand {
                   """)
     var jsonDataOutputPath: String?
 
+    @Option(help: "Default type to extend when generating Resolver type safety methods")
+    var defaultExtensionTarget = "Resolver"
+
     public init() {}
 
     public func run() throws {
         let parsedConfig: ConfigurationSet
         do {
-            parsedConfig = try parseAssemblies(at: assemblyInputPath)
+            parsedConfig = try parseAssemblies(at: assemblyInputPath, defaultTargetResolver: defaultExtensionTarget)
             if let jsonDataOutputPath {
                 let data = try JSONEncoder().encode(parsedConfig.assemblies)
                 try data.write(to: URL(fileURLWithPath: jsonDataOutputPath))
diff --git a/Tests/KnitCodeGenTests/AssemblyParsingTests.swift b/Tests/KnitCodeGenTests/AssemblyParsingTests.swift
index c19868a..16dadab 100644
--- a/Tests/KnitCodeGenTests/AssemblyParsingTests.swift
+++ b/Tests/KnitCodeGenTests/AssemblyParsingTests.swift
@@ -267,7 +267,11 @@ private func assertParsesSyntaxTree(
 ) throws -> Configuration {
     var errorsToPrint = [Error]()
 
-    let configuration = try parseSyntaxTree(sourceFile, errorsToPrint: &errorsToPrint)
+    let configuration = try parseSyntaxTree(
+        sourceFile,
+        errorsToPrint: &errorsToPrint,
+        defaultTargetResolver: "Resolver"
+    )
 
     if let assertErrorsCallback {
         assertErrorsCallback(errorsToPrint)