Export Layer and DynamicConfig (#227)

* Export Layer and DynamicConfig

* Feedback - remove dependnecy on store from EvalDetails

* export as Statsig to remove _instance

package.json

@@ -1,6 +1,6 @@
 {
   "name": "statsig-node",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "description": "Statsig Node.js SDK for usage in multi-user server environments.",
   "main": "dist/index.js",
   "scripts": {

src/EvaluationDetails.ts

@@ -1,12 +1,4 @@
-import SpecStore from './SpecStore';
-
-export type EvaluationReason =
-  | 'Network'
-  | 'LocalOverride'
-  | 'Unrecognized'
-  | 'Uninitialized'
-  | 'Bootstrap'
-  | 'DataAdapter';
+import { EvaluationReason } from './EvaluationReason';
 
 export class EvaluationDetails {
   readonly configSyncTime: number;
@@ -25,15 +17,19 @@ export class EvaluationDetails {
     this.serverTime = Date.now();
   }
 
-  static uninitialized(): EvaluationDetails {
-    return new EvaluationDetails(0, 0, 'Uninitialized');
+  static uninitialized() {
+    return new EvaluationDetails(
+      0,
+      0,
+      'Uninitialized',
+    );
   }
 
-  static make(store: SpecStore, reason?: EvaluationReason) {
+  static make(lastUpdateTime: number, initialUpdateTime: number, reason: EvaluationReason) {
     return new EvaluationDetails(
-      store.getLastUpdateTime(),
-      store.getInitialUpdateTime(),
-      reason ?? store.getInitReason(),
+      initialUpdateTime,
+      lastUpdateTime,
+      reason,
     );
   }
 }

src/EvaluationReason.ts

@@ -0,0 +1,7 @@
+export type EvaluationReason =
+  | 'Network'
+  | 'LocalOverride'
+  | 'Unrecognized'
+  | 'Uninitialized'
+  | 'Bootstrap'
+  | 'DataAdapter';

src/Evaluator.ts

@@ -95,7 +95,7 @@ export default class Evaluator {
     const override = this.lookupGateOverride(user, gateName);
     if (override) {
       return override.withEvaluationDetails(
-        EvaluationDetails.make(this.store, 'LocalOverride'),
+        EvaluationDetails.make(this.store.getLastUpdateTime(), this.store.getInitialUpdateTime(), 'LocalOverride'),
       );
     }
 
@@ -112,7 +112,7 @@ export default class Evaluator {
     const override = this.lookupConfigOverride(user, configName);
     if (override) {
       return override.withEvaluationDetails(
-        EvaluationDetails.make(this.store, 'LocalOverride'),
+        EvaluationDetails.make(this.store.getLastUpdateTime(), this.store.getInitialUpdateTime(), 'LocalOverride'),
       );
     }
 
@@ -129,7 +129,7 @@ export default class Evaluator {
     const override = this.lookupLayerOverride(user, layerName);
     if (override) {
       return override.withEvaluationDetails(
-        EvaluationDetails.make(this.store, 'LocalOverride'),
+        EvaluationDetails.make(this.store.getLastUpdateTime(), this.store.getInitialUpdateTime(), 'LocalOverride'),
       );
     }
 
@@ -387,12 +387,18 @@ export default class Evaluator {
   _evalConfig(user: StatsigUser, config: ConfigSpec | null): ConfigEvaluation {
     if (!config) {
       return new ConfigEvaluation(false).withEvaluationDetails(
-        EvaluationDetails.make(this.store, 'Unrecognized'),
+        EvaluationDetails.make(this.store.getLastUpdateTime(), this.store.getInitialUpdateTime(), 'Unrecognized'),
       );
     }
 
     const evaulation = this._eval(user, config);
-    return evaulation.withEvaluationDetails(EvaluationDetails.make(this.store));
+    return evaulation.withEvaluationDetails(
+      EvaluationDetails.make(
+        this.store.getLastUpdateTime(),
+        this.store.getInitialUpdateTime(),
+        this.store.getInitReason(),
+      ),
+    );
   }
 
   _eval(user: StatsigUser, config: ConfigSpec): ConfigEvaluation {
@@ -478,10 +484,10 @@ export default class Evaluator {
   _evalPassPercent(user: StatsigUser, rule: ConfigRule, config: ConfigSpec) {
     const hash = computeUserHash(
       config.salt +
-        '.' +
-        (rule.salt ?? rule.id) +
-        '.' +
-        (this._getUnitID(user, rule.idType) ?? ''),
+      '.' +
+      (rule.salt ?? rule.id) +
+      '.' +
+      (this._getUnitID(user, rule.idType) ?? ''),
     );
     return (
       Number(hash % BigInt(CONDITION_SEGMENT_COUNT)) < rule.passPercentage * 100