function getMetadata(metadataKey, target, propertyKey) {
            if (!IsObject(target))
                throw new TypeError();
            if (!IsUndefined(propertyKey))
                propertyKey = ToPropertyKey(propertyKey);
            return OrdinaryGetMetadata(metadataKey, target, propertyKey);
        }
function getMetadata(metadataKey, target, propertyKey) {
            if (!IsObject(target))
                throw new TypeError();
            if (!IsUndefined(propertyKey))
                propertyKey = ToPropertyKey(propertyKey);
            return OrdinaryGetMetadata(metadataKey, target, propertyKey);
        }
function getMetadata ( metadataKey , target , propertyKey ) { if ( ! IsObject ( target ) ) throw new TypeError ( ) ; if ( ! IsUndefined ( propertyKey ) ) propertyKey = ToPropertyKey ( propertyKey ) ; return OrdinaryGetMetadata ( metadataKey , target , propertyKey ) ; }
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 propertyKey (Optional) 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;

constructor(p) { }
static staticMethod(p) { }
method(p) { }
}

// constructor
result = Reflect.getMetadata("custom:annotation", Example);

// 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");
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 propertyKey ( Optional ) The property key for the target . @returns The metadata value for the metadata key if found ; otherwise undefined . @example