chore: no changes required in persisted model

No changes required in persisted model file.
Signed-off-by: Hage Yaapa <hage.yaapa@in.ibm.com>

types/persisted-model.d.ts

@@ -5,7 +5,6 @@
 
 import {Callback, Options, PromiseOrVoid} from './common';
 import {ModelBase, ModelData} from './model';
-import {Listener, OperationHookContext} from './observer-mixin';
 import {Filter, Where} from './query';
 
 /**
@@ -520,67 +519,6 @@ export declare class PersistedModel extends ModelBase {
    * @returns {String} The `id` property name
    */
   static getIdName(): string;
-
-  /**
-  * Register an asynchronous observer for the given operation (event).
-  *
-  * Example:
-  *
-  * Registers a `before save` observer for a given model.
-  *
-  * ```js
-  * MyModel.observe('before save', function filterProperties(ctx, next) {
-  if (ctx.options && ctx.options.skipPropertyFilter) return next();
-  if (ctx.instance) {
-    FILTERED_PROPERTIES.forEach(function(p) {
-      ctx.instance.unsetAttribute(p);
-    });
-  } else {
-    FILTERED_PROPERTIES.forEach(function(p) {
-      delete ctx.data[p];
-    });
-  }
-  next();
-  });
-  * ```
-  *
-  * @param {String} operation The operation name.
-  * @callback {function} listener The listener function. It will be invoked with
-  * `this` set to the model constructor, e.g. `User`.
-  */
-  static observe(operation: string, handler: Listener<OperationHookContext<PersistedModelClass>>): void;
-
-  /**
-  * Unregister an asynchronous observer for the given operation (event).
-  *
-  * Example:
-  *
-  * ```js
-  * MyModel.removeObserver('before save', function removedObserver(ctx, next) {
-    // some logic user want to apply to the removed observer...
-    next();
-  });
-  * ```
-  *
-  * @param {String} operation The operation name.
-  * @callback {function} listener The listener function.
-  */
-  static removeObserver(operation: string, handler: Listener<OperationHookContext<PersistedModelClass>>): void;
-
-  /**
-  * Unregister all asynchronous observers for the given operation (event).
-  *
-  * Example:
-  *
-  * Remove all observers connected to the `before save` operation.
-  *
-  * ```js
-  * MyModel.clearObservers('before save');
-  * ```
-  *
-  * @param {String} operation The operation name.
-  */
-  static clearObservers(operation: string): void;
 }
 
 export type PersistedModelClass = typeof PersistedModel;