Fix: vitest-pool-workers use env in .dev.vars (#6180)

#5612 added support for selecting the environment of config used, but it missed passing it to the code that reads `.dev.vars.{environment}`

.changeset/itchy-bags-shake.md

@@ -0,0 +1,10 @@
+---
+"wrangler": patch
+"@cloudflare/vitest-pool-workers": patch
+---
+
+Fix: pass env to getBindings to support reading `.dev.vars.{environment}`
+
+https://github.com/cloudflare/workers-sdk/pull/5612 added support for selecting the environment of config used, but it missed passing it to the code that reads `.dev.vars.{environment}`
+
+Closes #5641

packages/wrangler/src/api/integrations/platform/index.ts

@@ -237,15 +237,15 @@ export type SourcelessWorkerOptions = Omit<
 
 export function unstable_getMiniflareWorkerOptions(
 	configPath: string,
-	environment?: string
+	env?: string
 ): {
 	workerOptions: SourcelessWorkerOptions;
 	define: Record<string, string>;
 	main?: string;
 } {
 	const config = readConfig(configPath, {
 		experimentalJsonConfig: true,
-		env: environment,
+		env,
 	});
 
 	const modulesRules: ModuleRule[] = config.rules
@@ -256,7 +256,6 @@ export function unstable_getMiniflareWorkerOptions(
 			fallthrough: rule.fallthrough,
 		}));
 
-	const env = undefined;
 	const bindings = getBindings(config, env, true, {});
 	const { bindingOptions } = buildMiniflareBindingOptions({
 		name: undefined,