Merge pull request #33147 from backstage/rugvip/simplify-extension-attach-to

Simplify the `ExtensionAttachTo` type

packages/frontend-plugin-api/report.api.md

@@ -921,7 +921,7 @@ export interface Extension<TConfig, TConfigInput = TConfig> {
   // (undocumented)
   $$type: '@backstage/Extension';
   // (undocumented)
-  readonly attachTo: ExtensionAttachToSpec;
+  readonly attachTo: ExtensionAttachTo;
   // (undocumented)
   readonly configSchema?: PortableSchema<TConfig, TConfigInput>;
   // (undocumented)
@@ -931,18 +931,10 @@ export interface Extension<TConfig, TConfigInput = TConfig> {
 }
 
 // @public (undocumented)
-export type ExtensionAttachTo =
-  | {
-      id: string;
-      input: string;
-    }
-  | Array<{
-      id: string;
-      input: string;
-    }>;
-
-// @public @deprecated (undocumented)
-export type ExtensionAttachToSpec = ExtensionAttachTo;
+export type ExtensionAttachTo = {
+  id: string;
+  input: string;
+};
 
 // @public (undocumented)
 export interface ExtensionBlueprint<

packages/frontend-plugin-api/src/wiring/index.ts

@@ -57,7 +57,6 @@ export {
 export {
   type Extension,
   type ExtensionAttachTo,
-  type ExtensionAttachToSpec,
 } from './resolveExtensionDefinition';
 export {
   type ExtensionDataContainer,

packages/frontend-plugin-api/src/wiring/resolveExtensionDefinition.ts

@@ -30,21 +30,13 @@ import {
 } from '@internal/frontend';
 
 /** @public */
-export type ExtensionAttachTo =
-  | { id: string; input: string }
-  | Array<{ id: string; input: string }>;
-
-/**
- * @deprecated Use {@link ExtensionAttachTo} instead.
- * @public
- */
-export type ExtensionAttachToSpec = ExtensionAttachTo;
+export type ExtensionAttachTo = { id: string; input: string };
 
 /** @public */
 export interface Extension<TConfig, TConfigInput = TConfig> {
   $$type: '@backstage/Extension';
   readonly id: string;
-  readonly attachTo: ExtensionAttachToSpec;
+  readonly attachTo: ExtensionAttachTo;
   readonly disabled: boolean;
   readonly configSchema?: PortableSchema<TConfig, TConfigInput>;
 }
@@ -151,7 +143,7 @@ function resolveExtensionId(
 function resolveAttachTo(
   attachTo: ExtensionDefinitionAttachTo | ExtensionDefinitionAttachTo[],
   namespace?: string,
-): ExtensionAttachToSpec {
+): ExtensionAttachTo | ExtensionAttachTo[] {
   const resolveSpec = (
     spec: ExtensionDefinitionAttachTo,
   ): { id: string; input: string } => {
@@ -213,7 +205,7 @@ export function resolveExtensionDefinition<
 
   return {
     ...rest,
-    attachTo: resolveAttachTo(attachTo, namespace),
+    attachTo: resolveAttachTo(attachTo, namespace) as ExtensionAttachTo,
     $$type: '@backstage/Extension',
     version: internalDefinition.version,
     id,