@openfeature/web-sdk - npm Package Compare versions

Comparing version 0.3.2-experimental to 0.3.3-experimental

dist/cjs/index.js

@@ -97,11 +97,11 @@ "use strict";
     };
-    function EventEmitter() {
-      EventEmitter.init.call(this);
+    function EventEmitter2() {
+      EventEmitter2.init.call(this);
     }
-    module2.exports = EventEmitter;
+    module2.exports = EventEmitter2;
     module2.exports.once = once;
-    EventEmitter.EventEmitter = EventEmitter;
-    EventEmitter.prototype._events = void 0;
-    EventEmitter.prototype._eventsCount = 0;
-    EventEmitter.prototype._maxListeners = void 0;
+    EventEmitter2.EventEmitter = EventEmitter2;
+    EventEmitter2.prototype._events = void 0;
+    EventEmitter2.prototype._eventsCount = 0;
+    EventEmitter2.prototype._maxListeners = void 0;
     var defaultMaxListeners = 10;
@@ -113,3 +113,3 @@ function checkListener(listener) {
     }
-    Object.defineProperty(EventEmitter, "defaultMaxListeners", {
+    Object.defineProperty(EventEmitter2, "defaultMaxListeners", {
       enumerable: true,
@@ -126,3 +126,3 @@ get: function() {
     });
-    EventEmitter.init = function() {
+    EventEmitter2.init = function() {
       if (this._events === void 0 || this._events === Object.getPrototypeOf(this)._events) {
@@ -134,3 +134,3 @@ this._events = /* @__PURE__ */ Object.create(null);
     };
-    EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+    EventEmitter2.prototype.setMaxListeners = function setMaxListeners(n) {
       if (typeof n !== "number" || n < 0 || NumberIsNaN(n)) {
@@ -144,9 +144,9 @@ throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + ".");
       if (that._maxListeners === void 0)
-        return EventEmitter.defaultMaxListeners;
+        return EventEmitter2.defaultMaxListeners;
       return that._maxListeners;
     }
-    EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+    EventEmitter2.prototype.getMaxListeners = function getMaxListeners() {
       return _getMaxListeners(this);
     };
-    EventEmitter.prototype.emit = function emit(type) {
+    EventEmitter2.prototype.emit = function emit(type) {
       var args = [];
@@ -229,7 +229,7 @@ for (var i = 1; i < arguments.length; i++)
     }
-    EventEmitter.prototype.addListener = function addListener(type, listener) {
+    EventEmitter2.prototype.addListener = function addListener(type, listener) {
       return _addListener(this, type, listener, false);
     };
-    EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-    EventEmitter.prototype.prependListener = function prependListener(type, listener) {
+    EventEmitter2.prototype.on = EventEmitter2.prototype.addListener;
+    EventEmitter2.prototype.prependListener = function prependListener(type, listener) {
       return _addListener(this, type, listener, true);
@@ -253,3 +253,3 @@ };
     }
-    EventEmitter.prototype.once = function once2(type, listener) {
+    EventEmitter2.prototype.once = function once2(type, listener) {
       checkListener(listener);
@@ -259,3 +259,3 @@ this.on(type, _onceWrap(this, type, listener));
     };
-    EventEmitter.prototype.prependOnceListener = function prependOnceListener(type, listener) {
+    EventEmitter2.prototype.prependOnceListener = function prependOnceListener(type, listener) {
       checkListener(listener);
@@ -265,3 +265,3 @@ this.prependListener(type, _onceWrap(this, type, listener));
     };
-    EventEmitter.prototype.removeListener = function removeListener(type, listener) {
+    EventEmitter2.prototype.removeListener = function removeListener(type, listener) {
       var list, events, position, i, originalListener;
@@ -306,4 +306,4 @@ checkListener(listener);
     };
-    EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
-    EventEmitter.prototype.removeAllListeners = function removeAllListeners(type) {
+    EventEmitter2.prototype.off = EventEmitter2.prototype.removeListener;
+    EventEmitter2.prototype.removeAllListeners = function removeAllListeners(type) {
       var listeners, events, i;
@@ -360,9 +360,9 @@ events = this._events;
     }
-    EventEmitter.prototype.listeners = function listeners(type) {
+    EventEmitter2.prototype.listeners = function listeners(type) {
       return _listeners(this, type, true);
     };
-    EventEmitter.prototype.rawListeners = function rawListeners(type) {
+    EventEmitter2.prototype.rawListeners = function rawListeners(type) {
       return _listeners(this, type, false);
     };
-    EventEmitter.listenerCount = function(emitter, type) {
+    EventEmitter2.listenerCount = function(emitter, type) {
       if (typeof emitter.listenerCount === "function") {
@@ -374,3 +374,3 @@ return emitter.listenerCount(type);
     };
-    EventEmitter.prototype.listenerCount = listenerCount;
+    EventEmitter2.prototype.listenerCount = listenerCount;
     function listenerCount(type) {
@@ -388,3 +388,3 @@ var events = this._events;
     }
-    EventEmitter.prototype.eventNames = function eventNames() {
+    EventEmitter2.prototype.eventNames = function eventNames() {
       return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
@@ -458,3 +458,2 @@ };
 __export(src_exports, {
-  ApiEvents: () => ApiEvents,
   DefaultLogger: () => DefaultLogger,
@@ -472,5 +471,6 @@ ErrorCode: () => ErrorCode,
   OpenFeatureError: () => OpenFeatureError,
-  OpenFeatureEventEmitter: () => import_events.EventEmitter,
+  OpenFeatureEventEmitter: () => OpenFeatureEventEmitter,
   ParseError: () => ParseError,
   ProviderEvents: () => ProviderEvents,
+  ProviderStatus: () => ProviderStatus,
   SafeLogger: () => SafeLogger,
@@ -498,3 +498,3 @@ StandardResolutionReasons: () => StandardResolutionReasons,
   /**
-   * 	The resolved value was configured statically, or otherwise fell back to a pre-configured value.
+   *  The resolved value was configured statically, or otherwise fell back to a pre-configured value.
    */
@@ -531,2 +531,8 @@ DEFAULT: "DEFAULT",
 })(ErrorCode || {});
+var ProviderStatus = /* @__PURE__ */ ((ProviderStatus2) => {
+  ProviderStatus2["NOT_READY"] = "NOT_READY";
+  ProviderStatus2["READY"] = "READY";
+  ProviderStatus2["ERROR"] = "ERROR";
+  return ProviderStatus2;
+})(ProviderStatus || {});
 
@@ -664,2 +670,72 @@ // ../shared/src/errors/open-feature-error-abstract.ts
 
+// ../shared/src/events.ts
+var import_events = __toESM(require_events());
+var ProviderEvents = /* @__PURE__ */ ((ProviderEvents2) => {
+  ProviderEvents2["Ready"] = "PROVIDER_READY";
+  ProviderEvents2["Error"] = "PROVIDER_ERROR";
+  ProviderEvents2["ConfigurationChanged"] = "PROVIDER_CONFIGURATION_CHANGED";
+  ProviderEvents2["Stale"] = "PROVIDER_STALE";
+  return ProviderEvents2;
+})(ProviderEvents || {});
+var OpenFeatureEventEmitter = class {
+  constructor(globalLogger) {
+    this.globalLogger = globalLogger;
+    this._handlers = /* @__PURE__ */ new WeakMap();
+    this.eventEmitter = new import_events.default({ captureRejections: true });
+    this.eventEmitter.on("error", (err) => {
+      var _a;
+      (_a = this._logger) == null ? void 0 : _a.error("Error running event handler:", err);
+    });
+  }
+  emit(eventType, context) {
+    this.eventEmitter.emit(eventType, context);
+  }
+  addHandler(eventType, handler) {
+    const asyncHandler = (context) => __async(this, null, function* () {
+      yield handler(context);
+    });
+    this._handlers.set(handler, asyncHandler);
+    this.eventEmitter.on(eventType, asyncHandler);
+  }
+  removeHandler(eventType, handler) {
+    const asyncHandler = this._handlers.get(handler);
+    if (!asyncHandler) {
+      return;
+    }
+    this.eventEmitter.removeListener(eventType, asyncHandler);
+  }
+  removeAllHandlers(eventType) {
+    if (eventType) {
+      this.eventEmitter.removeAllListeners(eventType);
+    } else {
+      this.eventEmitter.removeAllListeners();
+    }
+  }
+  getHandlers(eventType) {
+    return this.eventEmitter.listeners(eventType);
+  }
+  setLogger(logger) {
+    this._eventLogger = new SafeLogger(logger);
+    return this;
+  }
+  get _logger() {
+    var _a;
+    return this._eventLogger || ((_a = this.globalLogger) == null ? void 0 : _a.call(this));
+  }
+};
+
+// ../shared/src/type-guards.ts
+function isString(value) {
+  return typeof value === "string";
+}
+function stringOrUndefined(value) {
+  return isString(value) ? value : void 0;
+}
+function isObject(value) {
+  return typeof value === "object";
+}
+function objectOrUndefined(value) {
+  return isObject(value) ? value : void 0;
+}
+
 // ../shared/src/open-feature.ts
@@ -671,6 +747,137 @@ var OpenFeatureCommonAPI = class {
     this._logger = new DefaultLogger();
+    this._events = new OpenFeatureEventEmitter(() => this._logger);
+    this._clientProviders = /* @__PURE__ */ new Map();
+    this._clientEvents = /* @__PURE__ */ new Map();
   }
+  setLogger(logger) {
+    this._logger = new SafeLogger(logger);
+    return this;
+  }
+  /**
+   * Get metadata about registered provider.
+   * @returns {ProviderMetadata} Provider Metadata
+   */
+  get providerMetadata() {
+    return this._defaultProvider.metadata;
+  }
   getContext() {
     return this._context;
   }
+  /**
+   * Adds a handler for the given provider event type.
+   * The handlers are called in the order they have been added.
+   * When changing the provider, the currently attached handlers will listen to the events of the new provider.
+   * @param {ProviderEvents} eventType The provider event type to listen to
+   * @param {EventHandler} handler The handler to run on occurrence of the event type
+   */
+  addHandler(eventType, handler) {
+    this._events.addHandler(eventType, handler);
+  }
+  /**
+   * Removes a handler for the given provider event type.
+   * @param {ProviderEvents} eventType The provider event type to remove the listener for
+   * @param {EventHandler} handler The handler to remove for the provider event type
+   */
+  removeHandler(eventType, handler) {
+    this._events.removeHandler(eventType, handler);
+  }
+  /**
+   * Gets the current handlers for the given provider event type.
+   * @param {ProviderEvents} eventType The provider event type to get the current handlers for
+   * @returns {EventHandler[]} The handlers currently attached to the given provider event type
+   */
+  getHandlers(eventType) {
+    return this._events.getHandlers(eventType);
+  }
+  setProvider(clientOrProvider, providerOrUndefined) {
+    var _a, _b, _c, _d, _e, _f;
+    const clientName = stringOrUndefined(clientOrProvider);
+    const provider = (_a = objectOrUndefined(clientOrProvider)) != null ? _a : objectOrUndefined(providerOrUndefined);
+    if (!provider) {
+      return this;
+    }
+    const oldProvider = this.getProviderForClient(clientName);
+    if (oldProvider === provider) {
+      return this;
+    }
+    const clientEmitter = this.getEventEmitterForClient(clientName);
+    if (typeof provider.initialize === "function") {
+      (_d = (_c = (_b = provider.initialize) == null ? void 0 : _b.call(provider, this._context)) == null ? void 0 : _c.then(() => {
+        var _a2;
+        clientEmitter.emit("PROVIDER_READY" /* Ready */, { clientName });
+        (_a2 = this._events) == null ? void 0 : _a2.emit("PROVIDER_READY" /* Ready */, { clientName });
+      })) == null ? void 0 : _d.catch((error) => {
+        var _a2;
+        clientEmitter.emit("PROVIDER_ERROR" /* Error */, { clientName, message: error.message });
+        (_a2 = this._events) == null ? void 0 : _a2.emit("PROVIDER_ERROR" /* Error */, { clientName, message: error.message });
+      });
+    } else {
+      clientEmitter.emit("PROVIDER_READY" /* Ready */, { clientName });
+      (_e = this._events) == null ? void 0 : _e.emit("PROVIDER_READY" /* Ready */, { clientName });
+    }
+    if (clientName) {
+      this._clientProviders.set(clientName, provider);
+    } else {
+      this._defaultProvider = provider;
+    }
+    this.transferListeners(oldProvider, provider, clientName, clientEmitter);
+    if (![...this._clientProviders.values(), this._defaultProvider].includes(oldProvider)) {
+      (_f = oldProvider == null ? void 0 : oldProvider.onClose) == null ? void 0 : _f.call(oldProvider);
+    }
+    return this;
+  }
+  getProviderForClient(name) {
+    var _a;
+    if (!name) {
+      return this._defaultProvider;
+    }
+    return (_a = this._clientProviders.get(name)) != null ? _a : this._defaultProvider;
+  }
+  getEventEmitterForClient(name) {
+    const emitter = this._clientEvents.get(name);
+    if (emitter) {
+      return emitter;
+    }
+    const newEmitter = new OpenFeatureEventEmitter(() => this._logger);
+    this._clientEvents.set(name, newEmitter);
+    return newEmitter;
+  }
+  transferListeners(oldProvider, newProvider, clientName, clientEmitter) {
+    var _a;
+    (_a = oldProvider.events) == null ? void 0 : _a.removeAllHandlers();
+    Object.values(ProviderEvents).forEach(
+      (eventType) => {
+        var _a2;
+        return (_a2 = newProvider.events) == null ? void 0 : _a2.addHandler(eventType, (details) => __async(this, null, function* () {
+          clientEmitter.emit(eventType, __spreadProps(__spreadValues({}, details), { clientName }));
+          this._events.emit(eventType, __spreadProps(__spreadValues({}, details), { clientName }));
+        }));
+      }
+    );
+  }
+  close() {
+    return __async(this, null, function* () {
+      var _a, _b;
+      try {
+        yield (_b = (_a = this == null ? void 0 : this._defaultProvider) == null ? void 0 : _a.onClose) == null ? void 0 : _b.call(_a);
+      } catch (err) {
+        this.handleShutdownError(this._defaultProvider, err);
+      }
+      const providers = Array.from(this._clientProviders);
+      yield Promise.all(
+        providers.map((_0) => __async(this, [_0], function* ([, provider]) {
+          var _a2;
+          try {
+            yield (_a2 = provider.onClose) == null ? void 0 : _a2.call(provider);
+          } catch (err) {
+            this.handleShutdownError(this._defaultProvider, err);
+          }
+        }))
+      );
+    });
+  }
+  handleShutdownError(provider, err) {
+    this._logger.error(`Error during shutdown of provider ${provider.metadata.name}: ${err}`);
+    this._logger.error(err == null ? void 0 : err.stack);
+  }
   setTransactionContextPropagator(transactionContextPropagator) {
@@ -710,2 +917,5 @@ const baseMessage = "Invalid TransactionContextPropagator, will not be set: ";
   }
+  get status() {
+    return "NOT_READY" /* NOT_READY */;
+  }
   resolveBooleanEvaluation(_, defaultValue) {
@@ -732,18 +942,4 @@ return this.noOp(defaultValue);
 
-// src/types.ts
-var import_events = __toESM(require_events());
-var ProviderEvents = /* @__PURE__ */ ((ProviderEvents2) => {
-  ProviderEvents2["Ready"] = "PROVIDER_READY";
-  ProviderEvents2["Error"] = "PROVIDER_ERROR";
-  ProviderEvents2["ConfigurationChanged"] = "PROVIDER_CONFIGURATION_CHANGED";
-  ProviderEvents2["Stale"] = "PROVIDER_STALE";
-  return ProviderEvents2;
-})(ProviderEvents || {});
-var ApiEvents = /* @__PURE__ */ ((ApiEvents2) => {
-  ApiEvents2["ProviderChanged"] = "providerChanged";
-  return ApiEvents2;
-})(ApiEvents || {});
-
 // src/open-feature.ts
-var GLOBAL_OPENFEATURE_API_KEY = Symbol.for("@openfeature/js.api");
+var GLOBAL_OPENFEATURE_API_KEY = Symbol.for("@openfeature/web-sdk/api");
 var _globalThis = globalThis;
@@ -754,10 +950,7 @@ var OpenFeatureAPI = class extends OpenFeatureCommonAPI {
     super();
-    this._apiEvents = new import_events.EventEmitter();
-    this._providerReady = false;
     this._hooks = [];
-    this._provider = NOOP_PROVIDER;
+    this._defaultProvider = NOOP_PROVIDER;
   }
   /**
    * Gets a singleton instance of the OpenFeature API.
-   *
    * @ignore
@@ -775,10 +968,2 @@ * @returns {OpenFeatureAPI} OpenFeature API
   }
-  /**
-   * Get metadata about registered provider.
-   *
-   * @returns {ProviderMetadata} Provider Metadata
-   */
-  get providerMetadata() {
-    return this._provider.metadata;
-  }
   setLogger(logger) {
@@ -804,38 +989,16 @@ this._logger = new SafeLogger(logger);
       this._context = context;
-      yield (_b = (_a = this._provider) == null ? void 0 : _a.onContextChange) == null ? void 0 : _b.call(_a, oldContext, context);
+      yield (_b = (_a = this._defaultProvider) == null ? void 0 : _a.onContextChange) == null ? void 0 : _b.call(_a, oldContext, context);
     });
   }
-  setProvider(provider) {
-    var _a, _b, _c, _d, _e, _f, _g;
-    if (this._provider !== provider) {
-      const oldProvider = this._provider;
-      this._provider = provider;
-      this._providerReady = false;
-      if (!this._provider.events) {
-        this._provider.events = new import_events.EventEmitter();
-      }
-      if (typeof ((_a = this._provider) == null ? void 0 : _a.initialize) === "function") {
-        (_e = (_d = (_c = (_b = this._provider).initialize) == null ? void 0 : _c.call(_b, this._context)) == null ? void 0 : _d.then(() => {
-          var _a2;
-          this._providerReady = true;
-          (_a2 = this._provider.events) == null ? void 0 : _a2.emit("PROVIDER_READY" /* Ready */);
-        })) == null ? void 0 : _e.catch(() => {
-          var _a2;
-          (_a2 = this._provider.events) == null ? void 0 : _a2.emit("PROVIDER_ERROR" /* Error */);
-        });
-      } else {
-        this._providerReady = true;
-        (_f = this._provider.events) == null ? void 0 : _f.emit("PROVIDER_READY" /* Ready */);
-      }
-      this._apiEvents.emit("providerChanged" /* ProviderChanged */);
-      (_g = oldProvider == null ? void 0 : oldProvider.onClose) == null ? void 0 : _g.call(oldProvider);
-    }
-    return this;
-  }
-  close() {
-    return __async(this, null, function* () {
-      var _a, _b;
-      yield (_b = (_a = this == null ? void 0 : this._provider) == null ? void 0 : _a.onClose) == null ? void 0 : _b.call(_a);
-    });
-  }
+  /**
+   * A factory function for creating new named OpenFeature clients. Clients can contain
+   * their own state (e.g. logger, hook, context). Multiple clients can be used
+   * to segment feature flag configuration.
+   *
+   * If there is already a provider bound to this name via {@link this.setProvider setProvider}, this provider will be used.
+   * Otherwise, the default provider is used until a provider is assigned to that name.
+   * @param {string} name The name of the client
+   * @param {string} version The version of the client (only used for metadata)
+   * @returns {Client} OpenFeature Client
+   */
   getClient(name, version) {
@@ -845,5 +1008,4 @@ return new OpenFeatureClient(
       // and so we don't have to make these public properties on the API class.
-      () => this._provider,
-      () => this._providerReady,
-      () => this._apiEvents,
+      () => this.getProviderForClient(name),
+      () => this.getEventEmitterForClient(name),
       () => this._logger,
@@ -858,23 +1020,29 @@ { name, version }
 var OpenFeatureClient = class {
-  constructor(providerAccessor, providerReady, apiEvents, globalLogger, options) {
+  constructor(providerAccessor, events, globalLogger, options) {
     this.providerAccessor = providerAccessor;
-    this.providerReady = providerReady;
+    this.events = events;
     this.globalLogger = globalLogger;
+    this.options = options;
     this._hooks = [];
-    this._handlerWrappers = [];
-    this.metadata = {
-      name: options.name,
-      version: options.version
+  }
+  get metadata() {
+    return {
+      name: this.options.name,
+      version: this.options.version,
+      providerMetadata: this.providerAccessor().metadata
     };
-    this.attachListeners();
-    apiEvents().on("providerChanged" /* ProviderChanged */, () => {
-      this.attachListeners();
-    });
   }
   addHandler(eventType, handler) {
-    this._handlerWrappers.push({ eventType, handler });
-    if (eventType === "PROVIDER_READY" /* Ready */ && this.providerReady()) {
-      handler();
+    this.events().addHandler(eventType, handler);
+    const providerReady = !this._provider.status || this._provider.status === "READY" /* READY */;
+    if (eventType === "PROVIDER_READY" /* Ready */ && providerReady) {
+      handler({ clientName: this.metadata.name });
     }
   }
+  removeHandler(notificationType, handler) {
+    this.events().removeHandler(notificationType, handler);
+  }
+  getHandlers(eventType) {
+    return this.events().getHandlers(eventType);
+  }
   setLogger(logger) {
@@ -899,9 +1067,3 @@ this._clientLogger = new SafeLogger(logger);
   getBooleanDetails(flagKey, defaultValue, options) {
-    return this.evaluate(
-      flagKey,
-      this._provider.resolveBooleanEvaluation,
-      defaultValue,
-      "boolean",
-      options
-    );
+    return this.evaluate(flagKey, this._provider.resolveBooleanEvaluation, defaultValue, "boolean", options);
   }
@@ -941,2 +1103,3 @@ getStringValue(flagKey, defaultValue, options) {
   evaluate(flagKey, resolver, defaultValue, flagType, options = {}) {
+    var _a;
     const allHooks = [
@@ -963,2 +1126,3 @@ ...OpenFeature.getHooks(),
       const evaluationDetails = __spreadProps(__spreadValues({}, resolution), {
+        flagMetadata: Object.freeze((_a = resolution.flagMetadata) != null ? _a : {}),
         flagKey
@@ -977,2 +1141,3 @@ });
         reason: StandardResolutionReasons.ERROR,
+        flagMetadata: Object.freeze({}),
         flagKey
@@ -1032,11 +1197,3 @@ };
   }
-  attachListeners() {
-    Object.values(ProviderEvents).forEach((eventType) => {
-      var _a;
-      return (_a = this._provider.events) == null ? void 0 : _a.on(eventType, () => {
-        this._handlerWrappers.filter((wrapper) => wrapper.eventType === eventType).forEach((wrapper) => wrapper.handler());
-      });
-    });
-  }
 };
 //# sourceMappingURL=index.js.map

dist/esm/index.js

@@ -91,11 +91,11 @@ var __create = Object.create;
     };
-    function EventEmitter() {
-      EventEmitter.init.call(this);
+    function EventEmitter2() {
+      EventEmitter2.init.call(this);
     }
-    module.exports = EventEmitter;
+    module.exports = EventEmitter2;
     module.exports.once = once;
-    EventEmitter.EventEmitter = EventEmitter;
-    EventEmitter.prototype._events = void 0;
-    EventEmitter.prototype._eventsCount = 0;
-    EventEmitter.prototype._maxListeners = void 0;
+    EventEmitter2.EventEmitter = EventEmitter2;
+    EventEmitter2.prototype._events = void 0;
+    EventEmitter2.prototype._eventsCount = 0;
+    EventEmitter2.prototype._maxListeners = void 0;
     var defaultMaxListeners = 10;
@@ -107,3 +107,3 @@ function checkListener(listener) {
     }
-    Object.defineProperty(EventEmitter, "defaultMaxListeners", {
+    Object.defineProperty(EventEmitter2, "defaultMaxListeners", {
       enumerable: true,
@@ -120,3 +120,3 @@ get: function() {
     });
-    EventEmitter.init = function() {
+    EventEmitter2.init = function() {
       if (this._events === void 0 || this._events === Object.getPrototypeOf(this)._events) {
@@ -128,3 +128,3 @@ this._events = /* @__PURE__ */ Object.create(null);
     };
-    EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+    EventEmitter2.prototype.setMaxListeners = function setMaxListeners(n) {
       if (typeof n !== "number" || n < 0 || NumberIsNaN(n)) {
@@ -138,9 +138,9 @@ throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + ".");
       if (that._maxListeners === void 0)
-        return EventEmitter.defaultMaxListeners;
+        return EventEmitter2.defaultMaxListeners;
       return that._maxListeners;
     }
-    EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+    EventEmitter2.prototype.getMaxListeners = function getMaxListeners() {
       return _getMaxListeners(this);
     };
-    EventEmitter.prototype.emit = function emit(type) {
+    EventEmitter2.prototype.emit = function emit(type) {
       var args = [];
@@ -223,7 +223,7 @@ for (var i = 1; i < arguments.length; i++)
     }
-    EventEmitter.prototype.addListener = function addListener(type, listener) {
+    EventEmitter2.prototype.addListener = function addListener(type, listener) {
       return _addListener(this, type, listener, false);
     };
-    EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-    EventEmitter.prototype.prependListener = function prependListener(type, listener) {
+    EventEmitter2.prototype.on = EventEmitter2.prototype.addListener;
+    EventEmitter2.prototype.prependListener = function prependListener(type, listener) {
       return _addListener(this, type, listener, true);
@@ -247,3 +247,3 @@ };
     }
-    EventEmitter.prototype.once = function once2(type, listener) {
+    EventEmitter2.prototype.once = function once2(type, listener) {
       checkListener(listener);
@@ -253,3 +253,3 @@ this.on(type, _onceWrap(this, type, listener));
     };
-    EventEmitter.prototype.prependOnceListener = function prependOnceListener(type, listener) {
+    EventEmitter2.prototype.prependOnceListener = function prependOnceListener(type, listener) {
       checkListener(listener);
@@ -259,3 +259,3 @@ this.prependListener(type, _onceWrap(this, type, listener));
     };
-    EventEmitter.prototype.removeListener = function removeListener(type, listener) {
+    EventEmitter2.prototype.removeListener = function removeListener(type, listener) {
       var list, events, position, i, originalListener;
@@ -300,4 +300,4 @@ checkListener(listener);
     };
-    EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
-    EventEmitter.prototype.removeAllListeners = function removeAllListeners(type) {
+    EventEmitter2.prototype.off = EventEmitter2.prototype.removeListener;
+    EventEmitter2.prototype.removeAllListeners = function removeAllListeners(type) {
       var listeners, events, i;
@@ -354,9 +354,9 @@ events = this._events;
     }
-    EventEmitter.prototype.listeners = function listeners(type) {
+    EventEmitter2.prototype.listeners = function listeners(type) {
       return _listeners(this, type, true);
     };
-    EventEmitter.prototype.rawListeners = function rawListeners(type) {
+    EventEmitter2.prototype.rawListeners = function rawListeners(type) {
       return _listeners(this, type, false);
     };
-    EventEmitter.listenerCount = function(emitter, type) {
+    EventEmitter2.listenerCount = function(emitter, type) {
       if (typeof emitter.listenerCount === "function") {
@@ -368,3 +368,3 @@ return emitter.listenerCount(type);
     };
-    EventEmitter.prototype.listenerCount = listenerCount;
+    EventEmitter2.prototype.listenerCount = listenerCount;
     function listenerCount(type) {
@@ -382,3 +382,3 @@ var events = this._events;
     }
-    EventEmitter.prototype.eventNames = function eventNames() {
+    EventEmitter2.prototype.eventNames = function eventNames() {
       return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
@@ -464,3 +464,3 @@ };
   /**
-   * 	The resolved value was configured statically, or otherwise fell back to a pre-configured value.
+   *  The resolved value was configured statically, or otherwise fell back to a pre-configured value.
    */
@@ -497,2 +497,8 @@ DEFAULT: "DEFAULT",
 })(ErrorCode || {});
+var ProviderStatus = /* @__PURE__ */ ((ProviderStatus2) => {
+  ProviderStatus2["NOT_READY"] = "NOT_READY";
+  ProviderStatus2["READY"] = "READY";
+  ProviderStatus2["ERROR"] = "ERROR";
+  return ProviderStatus2;
+})(ProviderStatus || {});
 
@@ -630,2 +636,72 @@ // ../shared/src/errors/open-feature-error-abstract.ts
 
+// ../shared/src/events.ts
+var import_events = __toESM(require_events());
+var ProviderEvents = /* @__PURE__ */ ((ProviderEvents2) => {
+  ProviderEvents2["Ready"] = "PROVIDER_READY";
+  ProviderEvents2["Error"] = "PROVIDER_ERROR";
+  ProviderEvents2["ConfigurationChanged"] = "PROVIDER_CONFIGURATION_CHANGED";
+  ProviderEvents2["Stale"] = "PROVIDER_STALE";
+  return ProviderEvents2;
+})(ProviderEvents || {});
+var OpenFeatureEventEmitter = class {
+  constructor(globalLogger) {
+    this.globalLogger = globalLogger;
+    this._handlers = /* @__PURE__ */ new WeakMap();
+    this.eventEmitter = new import_events.default({ captureRejections: true });
+    this.eventEmitter.on("error", (err) => {
+      var _a;
+      (_a = this._logger) == null ? void 0 : _a.error("Error running event handler:", err);
+    });
+  }
+  emit(eventType, context) {
+    this.eventEmitter.emit(eventType, context);
+  }
+  addHandler(eventType, handler) {
+    const asyncHandler = (context) => __async(this, null, function* () {
+      yield handler(context);
+    });
+    this._handlers.set(handler, asyncHandler);
+    this.eventEmitter.on(eventType, asyncHandler);
+  }
+  removeHandler(eventType, handler) {
+    const asyncHandler = this._handlers.get(handler);
+    if (!asyncHandler) {
+      return;
+    }
+    this.eventEmitter.removeListener(eventType, asyncHandler);
+  }
+  removeAllHandlers(eventType) {
+    if (eventType) {
+      this.eventEmitter.removeAllListeners(eventType);
+    } else {
+      this.eventEmitter.removeAllListeners();
+    }
+  }
+  getHandlers(eventType) {
+    return this.eventEmitter.listeners(eventType);
+  }
+  setLogger(logger) {
+    this._eventLogger = new SafeLogger(logger);
+    return this;
+  }
+  get _logger() {
+    var _a;
+    return this._eventLogger || ((_a = this.globalLogger) == null ? void 0 : _a.call(this));
+  }
+};
+
+// ../shared/src/type-guards.ts
+function isString(value) {
+  return typeof value === "string";
+}
+function stringOrUndefined(value) {
+  return isString(value) ? value : void 0;
+}
+function isObject(value) {
+  return typeof value === "object";
+}
+function objectOrUndefined(value) {
+  return isObject(value) ? value : void 0;
+}
+
 // ../shared/src/open-feature.ts
@@ -637,6 +713,137 @@ var OpenFeatureCommonAPI = class {
     this._logger = new DefaultLogger();
+    this._events = new OpenFeatureEventEmitter(() => this._logger);
+    this._clientProviders = /* @__PURE__ */ new Map();
+    this._clientEvents = /* @__PURE__ */ new Map();
   }
+  setLogger(logger) {
+    this._logger = new SafeLogger(logger);
+    return this;
+  }
+  /**
+   * Get metadata about registered provider.
+   * @returns {ProviderMetadata} Provider Metadata
+   */
+  get providerMetadata() {
+    return this._defaultProvider.metadata;
+  }
   getContext() {
     return this._context;
   }
+  /**
+   * Adds a handler for the given provider event type.
+   * The handlers are called in the order they have been added.
+   * When changing the provider, the currently attached handlers will listen to the events of the new provider.
+   * @param {ProviderEvents} eventType The provider event type to listen to
+   * @param {EventHandler} handler The handler to run on occurrence of the event type
+   */
+  addHandler(eventType, handler) {
+    this._events.addHandler(eventType, handler);
+  }
+  /**
+   * Removes a handler for the given provider event type.
+   * @param {ProviderEvents} eventType The provider event type to remove the listener for
+   * @param {EventHandler} handler The handler to remove for the provider event type
+   */
+  removeHandler(eventType, handler) {
+    this._events.removeHandler(eventType, handler);
+  }
+  /**
+   * Gets the current handlers for the given provider event type.
+   * @param {ProviderEvents} eventType The provider event type to get the current handlers for
+   * @returns {EventHandler[]} The handlers currently attached to the given provider event type
+   */
+  getHandlers(eventType) {
+    return this._events.getHandlers(eventType);
+  }
+  setProvider(clientOrProvider, providerOrUndefined) {
+    var _a, _b, _c, _d, _e, _f;
+    const clientName = stringOrUndefined(clientOrProvider);
+    const provider = (_a = objectOrUndefined(clientOrProvider)) != null ? _a : objectOrUndefined(providerOrUndefined);
+    if (!provider) {
+      return this;
+    }
+    const oldProvider = this.getProviderForClient(clientName);
+    if (oldProvider === provider) {
+      return this;
+    }
+    const clientEmitter = this.getEventEmitterForClient(clientName);
+    if (typeof provider.initialize === "function") {
+      (_d = (_c = (_b = provider.initialize) == null ? void 0 : _b.call(provider, this._context)) == null ? void 0 : _c.then(() => {
+        var _a2;
+        clientEmitter.emit("PROVIDER_READY" /* Ready */, { clientName });
+        (_a2 = this._events) == null ? void 0 : _a2.emit("PROVIDER_READY" /* Ready */, { clientName });
+      })) == null ? void 0 : _d.catch((error) => {
+        var _a2;
+        clientEmitter.emit("PROVIDER_ERROR" /* Error */, { clientName, message: error.message });
+        (_a2 = this._events) == null ? void 0 : _a2.emit("PROVIDER_ERROR" /* Error */, { clientName, message: error.message });
+      });
+    } else {
+      clientEmitter.emit("PROVIDER_READY" /* Ready */, { clientName });
+      (_e = this._events) == null ? void 0 : _e.emit("PROVIDER_READY" /* Ready */, { clientName });
+    }
+    if (clientName) {
+      this._clientProviders.set(clientName, provider);
+    } else {
+      this._defaultProvider = provider;
+    }
+    this.transferListeners(oldProvider, provider, clientName, clientEmitter);
+    if (![...this._clientProviders.values(), this._defaultProvider].includes(oldProvider)) {
+      (_f = oldProvider == null ? void 0 : oldProvider.onClose) == null ? void 0 : _f.call(oldProvider);
+    }
+    return this;
+  }
+  getProviderForClient(name) {
+    var _a;
+    if (!name) {
+      return this._defaultProvider;
+    }
+    return (_a = this._clientProviders.get(name)) != null ? _a : this._defaultProvider;
+  }
+  getEventEmitterForClient(name) {
+    const emitter = this._clientEvents.get(name);
+    if (emitter) {
+      return emitter;
+    }
+    const newEmitter = new OpenFeatureEventEmitter(() => this._logger);
+    this._clientEvents.set(name, newEmitter);
+    return newEmitter;
+  }
+  transferListeners(oldProvider, newProvider, clientName, clientEmitter) {
+    var _a;
+    (_a = oldProvider.events) == null ? void 0 : _a.removeAllHandlers();
+    Object.values(ProviderEvents).forEach(
+      (eventType) => {
+        var _a2;
+        return (_a2 = newProvider.events) == null ? void 0 : _a2.addHandler(eventType, (details) => __async(this, null, function* () {
+          clientEmitter.emit(eventType, __spreadProps(__spreadValues({}, details), { clientName }));
+          this._events.emit(eventType, __spreadProps(__spreadValues({}, details), { clientName }));
+        }));
+      }
+    );
+  }
+  close() {
+    return __async(this, null, function* () {
+      var _a, _b;
+      try {
+        yield (_b = (_a = this == null ? void 0 : this._defaultProvider) == null ? void 0 : _a.onClose) == null ? void 0 : _b.call(_a);
+      } catch (err) {
+        this.handleShutdownError(this._defaultProvider, err);
+      }
+      const providers = Array.from(this._clientProviders);
+      yield Promise.all(
+        providers.map((_0) => __async(this, [_0], function* ([, provider]) {
+          var _a2;
+          try {
+            yield (_a2 = provider.onClose) == null ? void 0 : _a2.call(provider);
+          } catch (err) {
+            this.handleShutdownError(this._defaultProvider, err);
+          }
+        }))
+      );
+    });
+  }
+  handleShutdownError(provider, err) {
+    this._logger.error(`Error during shutdown of provider ${provider.metadata.name}: ${err}`);
+    this._logger.error(err == null ? void 0 : err.stack);
+  }
   setTransactionContextPropagator(transactionContextPropagator) {
@@ -676,2 +883,5 @@ const baseMessage = "Invalid TransactionContextPropagator, will not be set: ";
   }
+  get status() {
+    return "NOT_READY" /* NOT_READY */;
+  }
   resolveBooleanEvaluation(_, defaultValue) {
@@ -698,18 +908,4 @@ return this.noOp(defaultValue);
 
-// src/types.ts
-var import_events = __toESM(require_events());
-var ProviderEvents = /* @__PURE__ */ ((ProviderEvents2) => {
-  ProviderEvents2["Ready"] = "PROVIDER_READY";
-  ProviderEvents2["Error"] = "PROVIDER_ERROR";
-  ProviderEvents2["ConfigurationChanged"] = "PROVIDER_CONFIGURATION_CHANGED";
-  ProviderEvents2["Stale"] = "PROVIDER_STALE";
-  return ProviderEvents2;
-})(ProviderEvents || {});
-var ApiEvents = /* @__PURE__ */ ((ApiEvents2) => {
-  ApiEvents2["ProviderChanged"] = "providerChanged";
-  return ApiEvents2;
-})(ApiEvents || {});
-
 // src/open-feature.ts
-var GLOBAL_OPENFEATURE_API_KEY = Symbol.for("@openfeature/js.api");
+var GLOBAL_OPENFEATURE_API_KEY = Symbol.for("@openfeature/web-sdk/api");
 var _globalThis = globalThis;
@@ -720,10 +916,7 @@ var OpenFeatureAPI = class extends OpenFeatureCommonAPI {
     super();
-    this._apiEvents = new import_events.EventEmitter();
-    this._providerReady = false;
     this._hooks = [];
-    this._provider = NOOP_PROVIDER;
+    this._defaultProvider = NOOP_PROVIDER;
   }
   /**
    * Gets a singleton instance of the OpenFeature API.
-   *
    * @ignore
@@ -741,10 +934,2 @@ * @returns {OpenFeatureAPI} OpenFeature API
   }
-  /**
-   * Get metadata about registered provider.
-   *
-   * @returns {ProviderMetadata} Provider Metadata
-   */
-  get providerMetadata() {
-    return this._provider.metadata;
-  }
   setLogger(logger) {
@@ -770,38 +955,16 @@ this._logger = new SafeLogger(logger);
       this._context = context;
-      yield (_b = (_a = this._provider) == null ? void 0 : _a.onContextChange) == null ? void 0 : _b.call(_a, oldContext, context);
+      yield (_b = (_a = this._defaultProvider) == null ? void 0 : _a.onContextChange) == null ? void 0 : _b.call(_a, oldContext, context);
     });
   }
-  setProvider(provider) {
-    var _a, _b, _c, _d, _e, _f, _g;
-    if (this._provider !== provider) {
-      const oldProvider = this._provider;
-      this._provider = provider;
-      this._providerReady = false;
-      if (!this._provider.events) {
-        this._provider.events = new import_events.EventEmitter();
-      }
-      if (typeof ((_a = this._provider) == null ? void 0 : _a.initialize) === "function") {
-        (_e = (_d = (_c = (_b = this._provider).initialize) == null ? void 0 : _c.call(_b, this._context)) == null ? void 0 : _d.then(() => {
-          var _a2;
-          this._providerReady = true;
-          (_a2 = this._provider.events) == null ? void 0 : _a2.emit("PROVIDER_READY" /* Ready */);
-        })) == null ? void 0 : _e.catch(() => {
-          var _a2;
-          (_a2 = this._provider.events) == null ? void 0 : _a2.emit("PROVIDER_ERROR" /* Error */);
-        });
-      } else {
-        this._providerReady = true;
-        (_f = this._provider.events) == null ? void 0 : _f.emit("PROVIDER_READY" /* Ready */);
-      }
-      this._apiEvents.emit("providerChanged" /* ProviderChanged */);
-      (_g = oldProvider == null ? void 0 : oldProvider.onClose) == null ? void 0 : _g.call(oldProvider);
-    }
-    return this;
-  }
-  close() {
-    return __async(this, null, function* () {
-      var _a, _b;
-      yield (_b = (_a = this == null ? void 0 : this._provider) == null ? void 0 : _a.onClose) == null ? void 0 : _b.call(_a);
-    });
-  }
+  /**
+   * A factory function for creating new named OpenFeature clients. Clients can contain
+   * their own state (e.g. logger, hook, context). Multiple clients can be used
+   * to segment feature flag configuration.
+   *
+   * If there is already a provider bound to this name via {@link this.setProvider setProvider}, this provider will be used.
+   * Otherwise, the default provider is used until a provider is assigned to that name.
+   * @param {string} name The name of the client
+   * @param {string} version The version of the client (only used for metadata)
+   * @returns {Client} OpenFeature Client
+   */
   getClient(name, version) {
@@ -811,5 +974,4 @@ return new OpenFeatureClient(
       // and so we don't have to make these public properties on the API class.
-      () => this._provider,
-      () => this._providerReady,
-      () => this._apiEvents,
+      () => this.getProviderForClient(name),
+      () => this.getEventEmitterForClient(name),
       () => this._logger,
@@ -824,23 +986,29 @@ { name, version }
 var OpenFeatureClient = class {
-  constructor(providerAccessor, providerReady, apiEvents, globalLogger, options) {
+  constructor(providerAccessor, events, globalLogger, options) {
     this.providerAccessor = providerAccessor;
-    this.providerReady = providerReady;
+    this.events = events;
     this.globalLogger = globalLogger;
+    this.options = options;
     this._hooks = [];
-    this._handlerWrappers = [];
-    this.metadata = {
-      name: options.name,
-      version: options.version
+  }
+  get metadata() {
+    return {
+      name: this.options.name,
+      version: this.options.version,
+      providerMetadata: this.providerAccessor().metadata
     };
-    this.attachListeners();
-    apiEvents().on("providerChanged" /* ProviderChanged */, () => {
-      this.attachListeners();
-    });
   }
   addHandler(eventType, handler) {
-    this._handlerWrappers.push({ eventType, handler });
-    if (eventType === "PROVIDER_READY" /* Ready */ && this.providerReady()) {
-      handler();
+    this.events().addHandler(eventType, handler);
+    const providerReady = !this._provider.status || this._provider.status === "READY" /* READY */;
+    if (eventType === "PROVIDER_READY" /* Ready */ && providerReady) {
+      handler({ clientName: this.metadata.name });
     }
   }
+  removeHandler(notificationType, handler) {
+    this.events().removeHandler(notificationType, handler);
+  }
+  getHandlers(eventType) {
+    return this.events().getHandlers(eventType);
+  }
   setLogger(logger) {
@@ -865,9 +1033,3 @@ this._clientLogger = new SafeLogger(logger);
   getBooleanDetails(flagKey, defaultValue, options) {
-    return this.evaluate(
-      flagKey,
-      this._provider.resolveBooleanEvaluation,
-      defaultValue,
-      "boolean",
-      options
-    );
+    return this.evaluate(flagKey, this._provider.resolveBooleanEvaluation, defaultValue, "boolean", options);
   }
@@ -907,2 +1069,3 @@ getStringValue(flagKey, defaultValue, options) {
   evaluate(flagKey, resolver, defaultValue, flagType, options = {}) {
+    var _a;
     const allHooks = [
@@ -929,2 +1092,3 @@ ...OpenFeature.getHooks(),
       const evaluationDetails = __spreadProps(__spreadValues({}, resolution), {
+        flagMetadata: Object.freeze((_a = resolution.flagMetadata) != null ? _a : {}),
         flagKey
@@ -943,2 +1107,3 @@ });
         reason: StandardResolutionReasons.ERROR,
+        flagMetadata: Object.freeze({}),
         flagKey
@@ -998,14 +1163,4 @@ };
   }
-  attachListeners() {
-    Object.values(ProviderEvents).forEach((eventType) => {
-      var _a;
-      return (_a = this._provider.events) == null ? void 0 : _a.on(eventType, () => {
-        this._handlerWrappers.filter((wrapper) => wrapper.eventType === eventType).forEach((wrapper) => wrapper.handler());
-      });
-    });
-  }
 };
-var export_OpenFeatureEventEmitter = import_events.EventEmitter;
 export {
-  ApiEvents,
   DefaultLogger,
@@ -1023,5 +1178,6 @@ ErrorCode,
   OpenFeatureError,
-  export_OpenFeatureEventEmitter as OpenFeatureEventEmitter,
+  OpenFeatureEventEmitter,
   ParseError,
   ProviderEvents,
+  ProviderStatus,
   SafeLogger,
@@ -1028,0 +1184,0 @@ StandardResolutionReasons,

dist/types.d.ts

@@ -0,1 +1,65 @@
+type EventMetadata = {
+    [key: string]: string | boolean | number;
+};
+type EventDetails = {
+    clientName?: string;
+    message?: string;
+    flagsChanged?: string[];
+    metadata?: EventMetadata;
+};
+type EventHandler = (eventDetails?: EventDetails) => Promise<unknown> | unknown;
+interface Eventing {
+    /**
+     * Adds a handler for the given provider event type.
+     * The handlers are called in the order they have been added.
+     * @param {ProviderEvents} eventType The provider event type to listen to
+     * @param {EventHandler} handler The handler to run on occurrence of the event type
+     */
+    addHandler(eventType: ProviderEvents, handler: EventHandler): void;
+    /**
+     * Removes a handler for the given provider event type.
+     * @param {ProviderEvents} eventType The provider event type to remove the listener for
+     * @param {EventHandler} handler The handler to remove for the provider event type
+     */
+    removeHandler(eventType: ProviderEvents, handler: EventHandler): void;
+    /**
+     * Gets the current handlers for the given provider event type.
+     * @param {ProviderEvents} eventType The provider event type to get the current handlers for
+     * @returns {EventHandler[]} The handlers currently attached to the given provider event type
+     */
+    getHandlers(eventType: ProviderEvents): EventHandler[];
+}
+declare enum ProviderEvents {
+    /**
+     * The provider is ready to evaluate flags.
+     */
+    Ready = "PROVIDER_READY",
+    /**
+     * The provider is in an error state.
+     */
+    Error = "PROVIDER_ERROR",
+    /**
+     * The flag configuration in the source-of-truth has changed.
+     */
+    ConfigurationChanged = "PROVIDER_CONFIGURATION_CHANGED",
+    /**
+     * The provider's cached state is no longer valid and may not be up-to-date with the source of truth.
+     */
+    Stale = "PROVIDER_STALE"
+}
+declare class OpenFeatureEventEmitter implements ManageLogger<OpenFeatureEventEmitter> {
+    private readonly globalLogger?;
+    private readonly _handlers;
+    private readonly eventEmitter;
+    private _eventLogger?;
+    constructor(globalLogger?: (() => Logger) | undefined);
+    emit(eventType: ProviderEvents, context?: EventDetails): void;
+    addHandler(eventType: ProviderEvents, handler: EventHandler): void;
+    removeHandler(eventType: ProviderEvents, handler: EventHandler): void;
+    removeAllHandlers(eventType?: ProviderEvents): void;
+    getHandlers(eventType: ProviderEvents): EventHandler[];
+    setLogger(logger: Logger): this;
+    private get _logger();
+}
+
 type PrimitiveValue = null | boolean | string | number;
@@ -49,3 +113,3 @@ type JsonObject = {
     /**
-     * 	The resolved value was configured statically, or otherwise fell back to a pre-configured value.
+     *  The resolved value was configured statically, or otherwise fell back to a pre-configured value.
      */
@@ -103,5 +167,12 @@ readonly DEFAULT: "DEFAULT";
 type ResolutionReason = keyof typeof StandardResolutionReasons | (string & Record<never, never>);
+/**
+ * A structure which supports definition of arbitrary properties, with keys of type string, and values of type boolean, string, or number.
+ *
+ * This structure is populated by a provider for use by an Application Author (via the Evaluation API) or an Application Integrator (via hooks).
+ */
+type FlagMetadata = Record<string, string | number | boolean>;
 type ResolutionDetails<U> = {
     value: U;
     variant?: string;
+    flagMetadata?: FlagMetadata;
     reason?: ResolutionReason;
@@ -113,2 +184,3 @@ errorCode?: ErrorCode;
     flagKey: string;
+    flagMetadata: Readonly<FlagMetadata>;
 } & ResolutionDetails<T>;
@@ -118,3 +190,2 @@ interface ManageContext<T> {
      * Access the evaluation context set on the receiver.
-     *
      * @returns {EvaluationContext} Evaluation context
@@ -126,3 +197,2 @@ */
      * on this receiver.
-     *
      * @template T The type of the receiver
@@ -140,3 +210,2 @@ * @param {EvaluationContext} context Evaluation context
      * unless overridden in a particular client.
-     *
      * @template T The type of the receiver
@@ -154,2 +223,3 @@ * @param {Logger} logger The logger to be used
     readonly name?: string;
+    readonly providerMetadata: ProviderMetadata;
 }
@@ -185,3 +255,2 @@ interface ProviderMetadata extends Metadata {
      * transaction.
-     *
      * @experimental
@@ -201,3 +270,2 @@ * @template T The type of the receiver
      * context propagator.
-     *
      * @experimental
@@ -212,3 +280,2 @@ * @returns {TransactionContext} The current transaction context
      * Sets the transaction context using the registered transaction context propagator.
-     *
      * @experimental
@@ -222,4 +289,25 @@ * @template R The return value of the callback
 }
+declare enum ProviderStatus {
+    NOT_READY = "NOT_READY",
+    READY = "READY",
+    ERROR = "ERROR"
+}
 interface CommonProvider {
     readonly metadata: ProviderMetadata;
+    readonly status?: ProviderStatus;
+    /**
+     * An event emitter for ProviderEvents.
+     * @see ProviderEvents
+     */
+    events?: OpenFeatureEventEmitter;
+    onClose?(): Promise<void>;
+    /**
+     * A handler function used to setup the provider.
+     * Called by the SDK after the provider is set.
+     * When the returned promise resolves, the SDK fires the ProviderEvents.Ready event.
+     * If the returned promise rejects, the SDK fires the ProviderEvents.Error event.
+     * Use this function to perform any context-dependent setup within the provider.
+     * @param context
+     */
+    initialize?(context?: EvaluationContext): Promise<void>;
 }
@@ -285,79 +373,66 @@
 
-declare abstract class OpenFeatureCommonAPI {
+declare abstract class OpenFeatureCommonAPI<P extends CommonProvider = CommonProvider> implements Eventing {
     protected _transactionContextPropagator: TransactionContextPropagator;
     protected _context: EvaluationContext;
     protected _logger: Logger;
+    protected abstract _defaultProvider: P;
+    private readonly _events;
+    protected _clientProviders: Map<string, P>;
+    protected _clientEvents: Map<string | undefined, OpenFeatureEventEmitter>;
     abstract clearHooks(): this;
-    abstract setLogger(logger: Logger): this;
+    setLogger(logger: Logger): this;
+    /**
+     * Get metadata about registered provider.
+     * @returns {ProviderMetadata} Provider Metadata
+     */
+    get providerMetadata(): ProviderMetadata;
     getContext(): EvaluationContext;
-    setTransactionContextPropagator(transactionContextPropagator: TransactionContextPropagator): OpenFeatureCommonAPI;
-    setTransactionContext<R>(transactionContext: TransactionContext, callback: (...args: unknown[]) => R, ...args: unknown[]): void;
-    getTransactionContext(): TransactionContext;
-}
-
-// Type definitions for events 3.0
-// Project: https://github.com/Gozala/events
-// Definitions by: Yasunori Ohoka <https://github.com/yasupeke>
-//                 Shenwei Wang <https://github.com/weareoutman>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-type Listener = (...args: any[]) => void;
-
-declare class EventEmitter {
-  static listenerCount(emitter: EventEmitter, type: string | number): number;
-  static defaultMaxListeners: number;
-
-  eventNames(): Array<string | number>;
-  setMaxListeners(n: number): this;
-  getMaxListeners(): number;
-  emit(type: string | number, ...args: any[]): boolean;
-  addListener(type: string | number, listener: Listener): this;
-  on(type: string | number, listener: Listener): this;
-  once(type: string | number, listener: Listener): this;
-  prependListener(type: string | number, listener: Listener): this;
-  prependOnceListener(type: string | number, listener: Listener): this;
-  removeListener(type: string | number, listener: Listener): this;
-  off(type: string | number, listener: Listener): this;
-  removeAllListeners(type?: string | number): this;
-  listeners(type: string | number): Listener[];
-  listenerCount(type: string | number): number;
-  rawListeners(type: string | number): Listener[];
-}
-
-declare enum ProviderEvents {
     /**
-     * The provider is ready to evaluate flags.
+     * Adds a handler for the given provider event type.
+     * The handlers are called in the order they have been added.
+     * When changing the provider, the currently attached handlers will listen to the events of the new provider.
+     * @param {ProviderEvents} eventType The provider event type to listen to
+     * @param {EventHandler} handler The handler to run on occurrence of the event type
      */
-    Ready = "PROVIDER_READY",
+    addHandler(eventType: ProviderEvents, handler: EventHandler): void;
     /**
-     * The provider is in an error state.
+     * Removes a handler for the given provider event type.
+     * @param {ProviderEvents} eventType The provider event type to remove the listener for
+     * @param {EventHandler} handler The handler to remove for the provider event type
      */
-    Error = "PROVIDER_ERROR",
+    removeHandler(eventType: ProviderEvents, handler: EventHandler): void;
     /**
-     * The flag configuration in the source-of-truth has changed.
+     * Gets the current handlers for the given provider event type.
+     * @param {ProviderEvents} eventType The provider event type to get the current handlers for
+     * @returns {EventHandler[]} The handlers currently attached to the given provider event type
      */
-    ConfigurationChanged = "PROVIDER_CONFIGURATION_CHANGED",
+    getHandlers(eventType: ProviderEvents): EventHandler[];
     /**
-     * The provider's cached state is not longer valid and may not be up-to-date with the source of truth.
+     * Sets the default provider for flag evaluations.
+     * This provider will be used by unnamed clients and named clients to which no provider is bound.
+     * Setting a provider supersedes the current provider used in new and existing clients without a name.
+     * @template P
+     * @param {P} provider The provider responsible for flag evaluations.
+     * @returns {OpenFeatureCommonAPI} OpenFeature API
      */
-    Stale = "PROVIDER_STALE"
+    setProvider(provider: P): this;
+    /**
+     * Sets the provider that OpenFeature will use for flag evaluations of providers with the given name.
+     * Setting a provider supersedes the current provider used in new and existing clients with that name.
+     * @template P
+     * @param {string} clientName The name to identify the client
+     * @param {P} provider The provider responsible for flag evaluations.
+     * @returns {this} OpenFeature API
+     */
+    setProvider(clientName: string, provider: P): this;
+    protected getProviderForClient(name?: string): P;
+    protected getEventEmitterForClient(name?: string): OpenFeatureEventEmitter;
+    private transferListeners;
+    close(): Promise<void>;
+    private handleShutdownError;
+    setTransactionContextPropagator(transactionContextPropagator: TransactionContextPropagator): OpenFeatureCommonAPI<P>;
+    setTransactionContext<R>(transactionContext: TransactionContext, callback: (...args: unknown[]) => R, ...args: unknown[]): void;
+    getTransactionContext(): TransactionContext;
 }
-interface EventData {
-    flagKeysChanged?: string[];
-    changeMetadata?: {
-        [key: string]: boolean | string;
-    };
-}
-declare enum ApiEvents {
-    ProviderChanged = "providerChanged"
-}
-interface Eventing {
-    addHandler(notificationType: string, handler: Handler): void;
-}
-type EventContext = {
-    notificationType: string;
-    [key: string]: unknown;
-};
-type Handler = (eventContext?: EventContext) => void;
-type EventCallbackMessage = (eventContext: EventContext) => void;
+
 /**
@@ -378,11 +453,4 @@ * Interface that providers must implement to resolve flag values for their particular
     /**
-     * An event emitter for ProviderEvents.
-     *
-     * @see ProviderEvents
-     */
-    events?: EventEmitter;
-    /**
      * A handler function to reconcile changes when the static context.
      * Called by the SDK when the context is changed.
-     *
      * @param oldContext
@@ -392,14 +460,3 @@ * @param newContext
     onContextChange?(oldContext: EvaluationContext, newContext: EvaluationContext): Promise<void>;
-    onClose?(): Promise<void>;
     /**
-     * A handler function used to setup the provider.
-     * Called by the SDK after the provider is set.
-     * When the returned promise resolves, the SDK fires the ProviderEvents.Ready event.
-     * If the returned promise rejects, the SDK fires the ProviderEvents.Error event.
-     * Use this function to perform any context-dependent setup within the provider.
-     *
-     * @param context
-     */
-    initialize?(context: EvaluationContext): Promise<void>;
-    /**
      * Resolve a boolean flag and its evaluation details.
@@ -425,3 +482,2 @@ */
      * If an EvaluationContext is returned, it will be merged with the pre-existing EvaluationContext.
-     *
      * @param hookContext
@@ -433,3 +489,2 @@ * @param hookHints
      * Runs after flag values are successfully resolved from the provider.
-     *
      * @param hookContext
@@ -442,3 +497,2 @@ * @param evaluationDetails
      * Runs in the event of an unhandled error or promise rejection during flag resolution, or any attached hooks.
-     *
      * @param hookContext
@@ -452,3 +506,2 @@ * @param error
      * Errors thrown here are unhandled by the client and will surface in application code.
-     *
      * @param hookContext
@@ -466,3 +519,2 @@ * @param hookHints
      * Hooks registered on the client run with all evaluations on that client.
-     *
      * @template T The type of the receiver
@@ -475,3 +527,2 @@ * @param {Hook<FlagValue>[]} hooks A list of hooks that should always run
      * Access all the hooks that are registered on this receiver.
-     *
      * @returns {Hook<FlagValue>[]} A list of the client hooks
@@ -482,3 +533,2 @@ */
      * Clears all the hooks that are registered on this receiver.
-     *
      * @template T The type of the receiver
@@ -496,3 +546,2 @@ * @returns {T} The receiver (this object)
      * Performs a flag evaluation that returns a boolean.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -506,3 +555,2 @@ * @param {boolean} defaultValue The value returned if an error occurs
      * Performs a flag evaluation that a returns an evaluation details object.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -516,3 +564,2 @@ * @param {boolean} defaultValue The value returned if an error occurs
      * Performs a flag evaluation that returns a string.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -528,3 +575,2 @@ * @template {string} T A optional generic argument constraining the string
      * Performs a flag evaluation that a returns an evaluation details object.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -540,3 +586,2 @@ * @template {string} T A optional generic argument constraining the string
      * Performs a flag evaluation that returns a number.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -552,3 +597,2 @@ * @template {number} T A optional generic argument constraining the number
      * Performs a flag evaluation that a returns an evaluation details object.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -564,3 +608,2 @@ * @template {number} T A optional generic argument constraining the number
      * Performs a flag evaluation that returns an object.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -576,3 +619,2 @@ * @template {JsonValue} T A optional generic argument describing the structure
      * Performs a flag evaluation that a returns an evaluation details object.
-     *
      * @param {string} flagKey The flag key uniquely identifies a particular flag
@@ -596,3 +638,2 @@ * @template {JsonValue} T A optional generic argument describing the structure
      * to segment feature flag configuration.
-     *
      * @param {string} name The name of the client
@@ -607,3 +648,2 @@ * @param {string} version The version of the client
      * a provider supersedes the current provider used in new and existing clients.
-     *
      * @param {Provider} provider The provider responsible for flag evaluations.
@@ -621,10 +661,12 @@ * @returns {GlobalApi} OpenFeature API
     private readonly providerAccessor;
-    private readonly providerReady;
+    private readonly events;
     private readonly globalLogger;
-    readonly metadata: ClientMetadata;
+    private readonly options;
     private _hooks;
     private _clientLogger?;
-    private _handlerWrappers;
-    constructor(providerAccessor: () => Provider, providerReady: () => boolean, apiEvents: () => EventEmitter, globalLogger: () => Logger, options: OpenFeatureClientOptions);
-    addHandler(eventType: ProviderEvents, handler: Handler): void;
+    constructor(providerAccessor: () => Provider, events: () => OpenFeatureEventEmitter, globalLogger: () => Logger, options: OpenFeatureClientOptions);
+    get metadata(): ClientMetadata;
+    addHandler(eventType: ProviderEvents, handler: EventHandler): void;
+    removeHandler(notificationType: ProviderEvents, handler: EventHandler): void;
+    getHandlers(eventType: ProviderEvents): EventHandler[];
     setLogger(logger: Logger): OpenFeatureClient;
@@ -649,3 +691,2 @@ addHooks(...hooks: Hook<FlagValue>[]): OpenFeatureClient;
     private get _logger();
-    private attachListeners;
 }
@@ -660,2 +701,3 @@
     };
+    get status(): ProviderStatus;
     resolveBooleanEvaluation(_: string, defaultValue: boolean): ResolutionDetails<boolean>;
@@ -669,11 +711,8 @@ resolveStringEvaluation(_: string, defaultValue: string): ResolutionDetails<string>;
 
-declare class OpenFeatureAPI extends OpenFeatureCommonAPI {
-    private _apiEvents;
-    private _providerReady;
+declare class OpenFeatureAPI extends OpenFeatureCommonAPI<Provider> {
     protected _hooks: Hook[];
-    protected _provider: Provider;
+    protected _defaultProvider: Provider;
     private constructor();
     /**
      * Gets a singleton instance of the OpenFeature API.
-     *
      * @ignore
@@ -683,8 +722,2 @@ * @returns {OpenFeatureAPI} OpenFeature API
     static getInstance(): OpenFeatureAPI;
-    /**
-     * Get metadata about registered provider.
-     *
-     * @returns {ProviderMetadata} Provider Metadata
-     */
-    get providerMetadata(): ProviderMetadata;
     setLogger(logger: Logger): this;
@@ -695,4 +728,13 @@ addHooks(...hooks: Hook<FlagValue>[]): this;
     setContext(context: EvaluationContext): Promise<void>;
-    setProvider(provider: Provider): OpenFeatureCommonAPI;
-    close(): Promise<void>;
+    /**
+     * A factory function for creating new named OpenFeature clients. Clients can contain
+     * their own state (e.g. logger, hook, context). Multiple clients can be used
+     * to segment feature flag configuration.
+     *
+     * If there is already a provider bound to this name via {@link this.setProvider setProvider}, this provider will be used.
+     * Otherwise, the default provider is used until a provider is assigned to that name.
+     * @param {string} name The name of the client
+     * @param {string} version The version of the client (only used for metadata)
+     * @returns {Client} OpenFeature Client
+     */
     getClient(name?: string, version?: string): Client;
@@ -702,3 +744,2 @@ }
  * A singleton instance of the OpenFeature API.
- *
  * @returns {OpenFeatureAPI} OpenFeature API
@@ -708,2 +749,2 @@ */
 
-export { ApiEvents, BeforeHookContext, Client, ClientMetadata, CommonProvider, DefaultLogger, ErrorCode, EvaluationContext, EvaluationContextValue, EvaluationDetails, EventCallbackMessage, EventContext, EventData, Eventing, Features, FlagEvaluationOptions, FlagNotFoundError, FlagValue, FlagValueType, GeneralError, GlobalApi, Handler, Hook, HookContext, HookHints, InvalidContextError, JsonArray, JsonObject, JsonValue, Logger, ManageContext, ManageLogger, ManageTransactionContextPropagator, NOOP_PROVIDER, NOOP_TRANSACTION_CONTEXT_PROPAGATOR, OpenFeature, OpenFeatureAPI, OpenFeatureClient, OpenFeatureCommonAPI, OpenFeatureError, EventEmitter as OpenFeatureEventEmitter, ParseError, PrimitiveValue, Provider, ProviderEvents, ProviderMetadata, ResolutionDetails, ResolutionReason, SafeLogger, StandardResolutionReasons, TargetingKeyMissingError, TransactionContext, TransactionContextPropagator, TypeMismatchError };
+export { BeforeHookContext, Client, ClientMetadata, CommonProvider, DefaultLogger, ErrorCode, EvaluationContext, EvaluationContextValue, EvaluationDetails, EventDetails, EventHandler, EventMetadata, Eventing, Features, FlagEvaluationOptions, FlagMetadata, FlagNotFoundError, FlagValue, FlagValueType, GeneralError, GlobalApi, Hook, HookContext, HookHints, InvalidContextError, JsonArray, JsonObject, JsonValue, Logger, ManageContext, ManageLogger, ManageTransactionContextPropagator, NOOP_PROVIDER, NOOP_TRANSACTION_CONTEXT_PROPAGATOR, OpenFeature, OpenFeatureAPI, OpenFeatureClient, OpenFeatureCommonAPI, OpenFeatureError, OpenFeatureEventEmitter, ParseError, PrimitiveValue, Provider, ProviderEvents, ProviderMetadata, ProviderStatus, ResolutionDetails, ResolutionReason, SafeLogger, StandardResolutionReasons, TargetingKeyMissingError, TransactionContext, TransactionContextPropagator, TypeMismatchError };

package.json

 {
   "name": "@openfeature/web-sdk",
-  "version": "0.3.2-experimental",
+  "version": "0.3.3-experimental",
   "description": "OpenFeature SDK for Web",
@@ -49,3 +49,3 @@ "main": "./dist/cjs/index.js",
   "devDependencies": {
-    "@openfeature/shared": "0.0.3"
+    "@openfeature/shared": "*"
   },
@@ -52,0 +52,0 @@ "typedoc": {

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