diff --git a/packages/wrangler/src/api/startDevWorker/BundlerController.ts b/packages/wrangler/src/api/startDevWorker/BundlerController.ts
index 736fd772833d..0795daad6c1e 100644
--- a/packages/wrangler/src/api/startDevWorker/BundlerController.ts
+++ b/packages/wrangler/src/api/startDevWorker/BundlerController.ts
@@ -61,7 +61,6 @@ export class BundlerController extends Controller<BundlerControllerEventMap> {
 				return;
 			}
 			assert(this.#tmpDir);
-			assert(config._additionalModules, "config._additionalModules");
 			assert(config.build?.moduleRules, "config.build?.moduleRules");
 			assert(config.build?.define, "config.build?.define");
 			if (!config.build?.bundle) {
@@ -193,7 +192,6 @@ export class BundlerController extends Controller<BundlerControllerEventMap> {
 			return;
 		}
 		assert(this.#tmpDir);
-		assert(config._additionalModules, "config._additionalModules");
 		assert(config.build?.moduleRules, "config.build?.moduleRules");
 		assert(config.build?.define, "config.build?.define");
 		const entry: Entry = {
@@ -208,8 +206,8 @@ export class BundlerController extends Controller<BundlerControllerEventMap> {
 				destination: this.#tmpDir.path,
 				jsxFactory: config.build?.jsxFactory,
 				jsxFragment: config.build?.jsxFragment,
-				processEntrypoint: Boolean(config._processEntrypoint),
-				additionalModules: config._additionalModules,
+				processEntrypoint: Boolean(config.build?.processEntrypoint),
+				additionalModules: config.build?.additionalModules ?? [],
 				rules: config.build.moduleRules,
 				assets: config.legacy?.assets,
 				serveAssetsFromWorker: Boolean(
diff --git a/packages/wrangler/src/api/startDevWorker/types.ts b/packages/wrangler/src/api/startDevWorker/types.ts
index 114beb9f67fc..2400b9fb8a5f 100644
--- a/packages/wrangler/src/api/startDevWorker/types.ts
+++ b/packages/wrangler/src/api/startDevWorker/types.ts
@@ -67,8 +67,6 @@ export interface InputStartDevWorkerOptions {
 	/** The triggers which will cause the worker's exported default handlers to be called. */
 	triggers?: Trigger[];
 
-	// -- PASSTHROUGH -- FROM OLD CONFIG TO NEW CONFIG (TEMP)
-
 	/**
 	 * Whether Wrangler should send usage metrics to Cloudflare for this project.
 	 *
@@ -78,16 +76,16 @@ export interface InputStartDevWorkerOptions {
 	sendMetrics?: boolean;
 	usageModel?: "bundled" | "unbound";
 	_bindings?: CfWorkerInit["bindings"]; // Type level constraint for bindings not sharing names
-	_processEntrypoint?: boolean;
-	_additionalModules?: CfModule[];
-	// --/ PASSTHROUGH --
 
 	/** Options applying to the worker's build step. Applies to deploy and dev. */
 	build?: {
 		/** Whether the worker and its dependencies are bundled. Defaults to true. */
 		bundle?: boolean;
 
+		additionalModules?: CfModule[];
+
 		findAdditionalModules?: boolean;
+		processEntrypoint?: boolean;
 		/** Specifies types of modules matched by globs. */
 		moduleRules?: Rule[];
 		/** Replace global identifiers with constant expressions, e.g. { debug: 'true', version: '"1.0.0"' }. Only takes effect if bundle: true. */
diff --git a/packages/wrangler/src/dev/dev.tsx b/packages/wrangler/src/dev/dev.tsx
index 7f286bf65914..8d760280a41f 100644
--- a/packages/wrangler/src/dev/dev.tsx
+++ b/packages/wrangler/src/dev/dev.tsx
@@ -382,14 +382,13 @@ function DevSession(props: DevSessionProps) {
 			script: { path: props.entry.file },
 			directory: props.entry.directory,
 			_bindings: props.bindings,
-			_processEntrypoint: props.processEntrypoint,
-			_additionalModules: props.additionalModules,
 
 			triggers: [...routes, ...queueConsumers, ...crons],
 			env: props.env,
 			sendMetrics: props.sendMetrics,
-			usageModel: props.usageModel,
 			build: {
+				additionalModules: props.additionalModules,
+				processEntrypoint: props.processEntrypoint,
 				bundle: !props.noBundle,
 				findAdditionalModules: props.findAdditionalModules,
 				minify: props.minify,
@@ -467,7 +466,6 @@ function DevSession(props: DevSessionProps) {
 		props.env,
 		props.legacyEnv,
 		props.sendMetrics,
-		props.usageModel,
 		props.noBundle,
 		props.findAdditionalModules,
 		props.minify,