Ability to specify configuration dates with offline init (#211)

* failing test

* ability to set and pass configuration dates

* bump minor version instead of patch version

Author: aarsilv

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@eppo/js-client-sdk",
-  "version": "3.15.1",
+  "version": "3.16.0",
   "description": "Eppo SDK for client-side JavaScript applications",
   "main": "dist/index.js",
   "files": [

src/index.spec.ts

@@ -416,6 +416,25 @@ describe('sync init', () => {
       'variant-1',
     );
   });
+
+  it('sets configuration dates', () => {
+    const testStart = new Date();
+    const configPublishedAt = new Date(testStart.getTime() - 10000).toISOString();
+    const configFetchedAt = testStart.toISOString();
+    const client = offlineInit({
+      flagsConfiguration: {
+        [flagKey]: mockNotObfuscatedFlagConfig,
+      },
+      configPublishedAt,
+      configFetchedAt,
+    });
+
+    const result = client.getStringAssignmentDetails(flagKey, 'subject-10', {}, 'default-value');
+
+    expect(result.variation).toBe('variant-1');
+    expect(result.evaluationDetails.configPublishedAt).toBe(configPublishedAt);
+    expect(result.evaluationDetails.configFetchedAt).toBe(configFetchedAt);
+  });
 });
 
 describe('initialization options', () => {

src/index.ts

@@ -66,6 +66,10 @@ export interface IClientConfigSync {
   enableOverrides?: boolean;
 
   overridesStorageKey?: string;
+
+  configPublishedAt?: string; // ISO Datetime String
+
+  configFetchedAt?: string; // ISO Datetime String
 }
 
 export { IClientConfig, IPrecomputedClientConfig };
@@ -544,6 +548,13 @@ export class EppoJSClient extends EppoClient {
         );
       this.setFlagConfigurationStore(memoryOnlyConfigurationStore);
 
+      if (config.configPublishedAt) {
+        memoryOnlyConfigurationStore.setConfigPublishedAt(config.configPublishedAt);
+      }
+      if (config.configFetchedAt) {
+        memoryOnlyConfigurationStore.setConfigFetchedAt(config.configFetchedAt);
+      }
+
       if (enableOverrides) {
         const overrideStore = overrideStorageFactory(
           {