declare namespace Reflect {
    /**
      * Applies a set of decorators to a target object.
      * @param decorators An array of decorators.
      * @param target The target object.
      * @returns The result of applying the provided decorators.
      * @remarks Decorators are applied in reverse order of their positions in the array.
      * @example
      *
      *     class Example { }
      *
      *     // constructor
      *     Example = Reflect.decorate(decoratorsArray, Example);
      *
      */
    function decorate(decorators: ClassDecorator[], target: Function): Function;
    /**
      * Applies a set of decorators to a property of a target object.
      * @param decorators An array of decorators.
      * @param target The target object.
      * @param targetKey The property key to decorate.
      * @param descriptor A property descriptor
      * @remarks Decorators are applied in reverse order.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod() { }
      *         method() { }
      *     }
      *
      *     // property (on constructor)
      *     Reflect.decorate(decoratorsArray, Example, "staticProperty");
      *
      *     // property (on prototype)
      *     Reflect.decorate(decoratorsArray, Example.prototype, "property");
      *
      *     // method (on constructor)
      *     Object.defineProperty(Example, "staticMethod",
      *         Reflect.decorate(decoratorsArray, Example, "staticMethod",
      *             Object.getOwnPropertyDescriptor(Example, "staticMethod")));
      *
      *     // method (on prototype)
      *     Object.defineProperty(Example.prototype, "method",
      *         Reflect.decorate(decoratorsArray, Example.prototype, "method",
      *             Object.getOwnPropertyDescriptor(Example.prototype, "method")));
      *
      */
    function decorate(decorators: (PropertyDecorator | MethodDecorator)[], target: Object, targetKey: string | symbol, descriptor?: PropertyDescriptor): PropertyDescriptor;
    /**
      * A default metadata decorator factory that can be used on a class, class member, or parameter.
      * @param metadataKey The key for the metadata entry.
      * @param metadataValue The value for the metadata entry.
      * @returns A decorator function.
      * @remarks
      * If `metadataKey` is already defined for the target and target key, the
      * metadataValue for that key will be overwritten.
      * @example
      *
      *     // constructor
      *     @Reflect.metadata(key, value)
      *     class Example {
      *     }
      *
      *     // property (on constructor, TypeScript only)
      *     class Example {
      *         @Reflect.metadata(key, value)
      *         static staticProperty;
      *     }
      *
      *     // property (on prototype, TypeScript only)
      *     class Example {
      *         @Reflect.metadata(key, value)
      *         property;
      *     }
      *
      *     // method (on constructor)
      *     class Example {
      *         @Reflect.metadata(key, value)
      *         static staticMethod() { }
      *     }
      *
      *     // method (on prototype)
      *     class Example {
      *         @Reflect.metadata(key, value)
      *         method() { }
      *     }
      *
      */
    function metadata(metadataKey: any, metadataValue: any): {
        (target: Function): void;
        (target: Object, targetKey: string | symbol): void;
    };
    /**
      * Define a unique metadata entry on the target.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param metadataValue A value that contains attached metadata.
      * @param target The target object on which to define metadata.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     Reflect.defineMetadata("custom:annotation", options, Example);
      *
      *     // decorator factory as metadata-producing annotation.
      *     function MyAnnotation(options): ClassDecorator {
      *         return target => Reflect.defineMetadata("custom:annotation", options, target);
      *     }
      *
      */
    function defineMetadata(metadataKey: any, metadataValue: any, target: Object): void;
    /**
      * Define a unique metadata entry on the target.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param metadataValue A value that contains attached metadata.
      * @param target The target object on which to define metadata.
      * @param targetKey The property key for the target.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     Reflect.defineMetadata("custom:annotation", Number, Example, "staticProperty");
      *
      *     // property (on prototype)
      *     Reflect.defineMetadata("custom:annotation", Number, Example.prototype, "property");
      *
      *     // method (on constructor)
      *     Reflect.defineMetadata("custom:annotation", Number, Example, "staticMethod");
      *
      *     // method (on prototype)
      *     Reflect.defineMetadata("custom:annotation", Number, Example.prototype, "method");
      *
      *     // decorator factory as metadata-producing annotation.
      *     function MyAnnotation(options): PropertyDecorator {
      *         return (target, key) => Reflect.defineMetadata("custom:annotation", options, target, key);
      *     }
      *
      */
    function defineMetadata(metadataKey: any, metadataValue: any, target: Object, targetKey: string | symbol): void;
    /**
      * Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.hasMetadata("custom:annotation", Example);
      *
      */
    function hasMetadata(metadataKey: any, target: Object): boolean;
    /**
      * Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.hasMetadata("custom:annotation", Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.hasMetadata("custom:annotation", Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "method");
      *
      */
    function hasMetadata(metadataKey: any, target: Object, targetKey: string | symbol): boolean;
    /**
      * Gets a value indicating whether the target object has the provided metadata key defined.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.hasOwnMetadata("custom:annotation", Example);
      *
      */
    function hasOwnMetadata(metadataKey: any, target: Object): boolean;
    /**
      * Gets a value indicating whether the target object has the provided metadata key defined.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "method");
      *
      */
    function hasOwnMetadata(metadataKey: any, target: Object, targetKey: string | symbol): boolean;
    /**
      * Gets the metadata value for the provided metadata key on the target object or its prototype chain.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.getMetadata("custom:annotation", Example);
      *
      */
    function getMetadata(metadataKey: any, target: Object): any;
    /**
      * Gets the metadata value for the provided metadata key on the target object or its prototype chain.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.getMetadata("custom:annotation", Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.getMetadata("custom:annotation", Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "method");
      *
      */
    function getMetadata(metadataKey: any, target: Object, targetKey: string | symbol): any;
    /**
      * Gets the metadata value for the provided metadata key on the target object.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.getOwnMetadata("custom:annotation", Example);
      *
      */
    function getOwnMetadata(metadataKey: any, target: Object): any;
    /**
      * Gets the metadata value for the provided metadata key on the target object.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "method");
      *
      */
    function getOwnMetadata(metadataKey: any, target: Object, targetKey: string | symbol): any;
    /**
      * Gets the metadata keys defined on the target object or its prototype chain.
      * @param target The target object on which the metadata is defined.
      * @returns An array of unique metadata keys.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.getMetadataKeys(Example);
      *
      */
    function getMetadataKeys(target: Object): any[];
    /**
      * Gets the metadata keys defined on the target object or its prototype chain.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns An array of unique metadata keys.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.getMetadataKeys(Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.getMetadataKeys(Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.getMetadataKeys(Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.getMetadataKeys(Example.prototype, "method");
      *
      */
    function getMetadataKeys(target: Object, targetKey: string | symbol): any[];
    /**
      * Gets the unique metadata keys defined on the target object.
      * @param target The target object on which the metadata is defined.
      * @returns An array of unique metadata keys.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.getOwnMetadataKeys(Example);
      *
      */
    function getOwnMetadataKeys(target: Object): any[];
    /**
      * Gets the unique metadata keys defined on the target object.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns An array of unique metadata keys.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.getOwnMetadataKeys(Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.getOwnMetadataKeys(Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.getOwnMetadataKeys(Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.getOwnMetadataKeys(Example.prototype, "method");
      *
      */
    function getOwnMetadataKeys(target: Object, targetKey: string | symbol): any[];
    /**
      * Deletes the metadata entry from the target object with the provided key.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @returns `true` if the metadata entry was found and deleted; otherwise, false.
      * @example
      *
      *     class Example {
      *     }
      *
      *     // constructor
      *     result = Reflect.deleteMetadata("custom:annotation", Example);
      *
      */
    function deleteMetadata(metadataKey: any, target: Object): boolean;
    /**
      * Deletes the metadata entry from the target object with the provided key.
      * @param metadataKey A key used to store and retrieve metadata.
      * @param target The target object on which the metadata is defined.
      * @param targetKey The property key for the target.
      * @returns `true` if the metadata entry was found and deleted; otherwise, false.
      * @example
      *
      *     class Example {
      *         // property declarations are not part of ES6, though they are valid in TypeScript:
      *         // static staticProperty;
      *         // property;
      *
      *         static staticMethod(p) { }
      *         method(p) { }
      *     }
      *
      *     // property (on constructor)
      *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticProperty");
      *
      *     // property (on prototype)
      *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "property");
      *
      *     // method (on constructor)
      *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticMethod");
      *
      *     // method (on prototype)
      *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "method");
      *
      */
    function deleteMetadata(metadataKey: any, target: Object, targetKey: string | symbol): boolean;
}
