[core/api] switch getItem from bool to enum

packages/core/src/api/apis/definitions/featureFlags.ts

@@ -28,13 +28,19 @@ import { FeatureFlagName } from '../../plugin/types';
  * or unstable upcoming features. Although there will be a common interface for users
  * to enable and disable feature flags, this API acts as another way to enable/disable.
  */
+
+export enum FeatureFlagState {
+  NotEnabled = false,
+  Enabled = true,
+}
+
 export type FeatureFlagsApi = {
   /**
    * Get the current user's status of a Feature Flag
    *
    * @returns bool True if the current user has enabled the feature flag
    */
-  getItem(name: FeatureFlagName): boolean;
+  getItem(name: FeatureFlagName): FeatureFlagState;
 
   /**
    * Enable an registered feature flag.

packages/core/src/api/app/FeatureFlags.tsx

@@ -16,7 +16,10 @@
 
 import React, { ComponentType, createContext, FC } from 'react';
 import { FeatureFlagName } from '../plugin/types';
-import { FeatureFlagsApi } from '../apis/definitions/featureFlags';
+import {
+  FeatureFlagState,
+  FeatureFlagsApi,
+} from '../apis/definitions/featureFlags';
 
 // TODO: figure out where to put implementations of APIs, both inside apps
 // but also in core/separate package.
@@ -55,8 +58,8 @@ class FeatureFlagsImpl implements FeatureFlagsApi {
     );
   }
 
-  getItem(name: FeatureFlagName): boolean {
-    return this.getUserEnabledFeatureFlags().has(name);
+  getItem(name: FeatureFlagName): FeatureFlagState {
+    return this.getUserEnabledFeatureFlags().has(name) as FeatureFlagState;
   }
 
   enable(name: FeatureFlagName): void {