Add client steps implementation to support existing functionalities

Author: alfonso-noriega

packages/app/src/cli/models/extensions/extension-instance.ts

@@ -44,6 +44,7 @@ export const CONFIG_EXTENSION_IDS: string[] = [
   WebhookSubscriptionSpecIdentifier,
   WebhooksSpecIdentifier,
   EventsSpecIdentifier,
+  'admin',
 ]
 
 /**

packages/app/src/cli/services/build/steps/copy-static-assets-step.ts

@@ -0,0 +1,11 @@
+import type {ClientStep, BuildContext} from '../client-steps.js'
+
+/**
+ * Executes a copy_static_assets build step.
+ *
+ * Copies static assets defined in the extension's build_manifest to the output directory.
+ * This is a no-op for extensions that do not define static assets.
+ */
+export async function executeCopyStaticAssetsStep(_step: ClientStep, context: BuildContext): Promise<void> {
+  return context.extension.copyStaticAssets()
+}

packages/app/src/cli/services/build/steps/create-tax-stub-step.ts

@@ -0,0 +1,14 @@
+import {touchFile, writeFile} from '@shopify/cli-kit/node/fs'
+import type {ClientStep, BuildContext} from '../client-steps.js'
+
+/**
+ * Executes a create_tax_stub build step.
+ *
+ * Creates a minimal JavaScript stub file at the extension's output path,
+ * satisfying the tax calculation extension bundle format.
+ */
+export async function executeCreateTaxStubStep(_step: ClientStep, context: BuildContext): Promise<void> {
+  const {extension} = context
+  await touchFile(extension.outputPath)
+  await writeFile(extension.outputPath, '(()=>{})();')
+}