packages/core: added basic nav target implementation

packages/core/src/api/index.ts

@@ -16,5 +16,6 @@
 
 export * from './api';
 export * from './apis';
+export * from './navTargets';
 export { FeatureFlags } from './app/FeatureFlags';
 export { useApp } from './app/AppContext';

packages/core/src/api/navTargets/NavTarget.ts

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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 type { NavTargetConfig, NavTargetOverrideConfig } from './types';
+
+export class MutableNavTarget {
+  private effectiveConfig: NavTargetConfig = this.config;
+
+  constructor(private readonly config: NavTargetConfig) {}
+
+  override(overrideConfig: NavTargetOverrideConfig) {
+    this.effectiveConfig = { ...this.config, ...overrideConfig };
+  }
+
+  get icon() {
+    return this.effectiveConfig.icon;
+  }
+
+  get path() {
+    return this.effectiveConfig.path;
+  }
+
+  get title() {
+    return this.effectiveConfig.title;
+  }
+}
+
+export function createNavTarget(config: NavTargetConfig): MutableNavTarget {
+  return new MutableNavTarget(config);
+}

packages/core/src/api/navTargets/index.ts

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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 type { NavTarget, NavTargetConfig, NavTargetOverrideConfig  } from './types';
+export { createNavTarget } from './NavTarget';

packages/core/src/api/navTargets/types.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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 { IconComponent } from '../../icons';
+
+export type NavTarget = {
+  path: string;
+  icon: IconComponent;
+  title: string;
+};
+
+export type NavTargetConfig = {
+  path: string;
+  icon: IconComponent;
+  title: string;
+};
+
+export type NavTargetOverrideConfig = {
+  path?: string;
+  icon?: IconComponent;
+  title?: string;
+};