frontend-internal: move OpaqueType to a new @internal/opaque package

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/frontend-internal/src/wiring/InternalExtensionDefinition.ts

@@ -25,7 +25,7 @@ import {
   PortableSchema,
   ResolvedExtensionInputs,
 } from '@backstage/frontend-plugin-api';
-import { OpaqueType } from './OpaqueType';
+import { OpaqueType } from '@internal/opaque';
 
 export const OpaqueExtensionDefinition = OpaqueType.create<{
   public: ExtensionDefinition<ExtensionDefinitionParameters>;

packages/frontend-internal/src/wiring/InternalFrontendPlugin.ts

@@ -19,7 +19,7 @@ import {
   FeatureFlagConfig,
   FrontendPlugin,
 } from '@backstage/frontend-plugin-api';
-import { OpaqueType } from './OpaqueType';
+import { OpaqueType } from '@internal/opaque';
 
 export const OpaqueFrontendPlugin = OpaqueType.create<{
   public: FrontendPlugin;

packages/internal-opaque/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname, {
+  rules: {
+    '@backstage/no-top-level-material-ui-4-imports': 'error',
+  },
+});

packages/internal-opaque/README.md

@@ -0,0 +1,3 @@
+# @internal/opaque
+
+This is an internal package for use by other internal packages. Instances created with `OpaqueType.create` should never be exported in any public API, instead use an `@internal/*` if they need to be used in multiple packages.

packages/internal-opaque/catalog-info.yaml

@@ -0,0 +1,9 @@
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: internal-opaque
+  title: "@internal/opaque"
+spec:
+  lifecycle: experimental
+  type: backstage-common-library
+  owner: maintainers

packages/internal-opaque/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@internal/opaque",
+  "version": "0.0.1",
+  "backstage": {
+    "role": "common-library",
+    "inline": true
+  },
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/internal-opaque"
+  },
+  "license": "Apache-2.0",
+  "sideEffects": false,
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "lint": "backstage-cli package lint",
+    "test": "backstage-cli package test"
+  },
+  "devDependencies": {
+    "@backstage/cli": "workspace:^",
+    "@testing-library/jest-dom": "^6.0.0",
+    "@testing-library/react": "^16.0.0"
+  }
+}

packages/internal-opaque/src/index.ts

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export { OpaqueType } from './OpaqueType';

yarn.lock

@@ -9872,6 +9872,16 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@internal/opaque@workspace:packages/internal-opaque":
+  version: 0.0.0-use.local
+  resolution: "@internal/opaque@workspace:packages/internal-opaque"
+  dependencies:
+    "@backstage/cli": "workspace:^"
+    "@testing-library/jest-dom": ^6.0.0
+    "@testing-library/react": ^16.0.0
+  languageName: unknown
+  linkType: soft
+
 "@internal/plugin-todo-list-backend@workspace:plugins/example-todo-list-backend":
   version: 0.0.0-use.local
   resolution: "@internal/plugin-todo-list-backend@workspace:plugins/example-todo-list-backend"