diff --git a/plugins/techdocs/src/reader/transformers/styles/rules/types.ts b/plugins/techdocs/src/reader/transformers/styles/rules/types.ts
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+++ b/plugins/techdocs/src/reader/transformers/styles/rules/types.ts
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 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.
+ */
+
+import { BackstageTheme } from '@backstage/theme';
+
+/**
+ * A Backstage sidebar object that contains properties such as its pin state.
+ */
+type BackstageSidebar = {
+  /** Tracks whether the user pinned the sidebar or not. */
+  isPinned: boolean;
+};
+
+/**
+ * A dependencies object injected into rules by the style processor.
+ */
+export type RuleOptions = {
+  /**
+   * A Backstage theme object that contains the application's design tokens.
+   */
+  theme: BackstageTheme;
+  /**
+   * A Backstage sidebar, see {@link BackstageSidebar} for more details.
+   */
+  sidebar: BackstageSidebar;
+};