// The rational behind the verbose Reflect-feature check below is the fact that there are polyfills
// which add an implementation for Reflect.defineMetadata but not for Reflect.getOwnMetadataKeys.
// Without this check consumers will encounter hard to track down runtime errors.
export function reflectionIsSupported() {
    return typeof Reflect !== 'undefined' && Reflect.defineMetadata && Reflect.getOwnMetadataKeys;
}
export function copyReflectionMetadata(to, from) {
    forwardMetadata(to, from);
    Object.getOwnPropertyNames(from.prototype).forEach(key => {
        forwardMetadata(to.prototype, from.prototype, key);
    });
    Object.getOwnPropertyNames(from).forEach(key => {
        forwardMetadata(to, from, key);
    });
}
function forwardMetadata(to, from, propertyKey) {
    const metaKeys = propertyKey
        ? Reflect.getOwnMetadataKeys(from, propertyKey)
        : Reflect.getOwnMetadataKeys(from);
    metaKeys.forEach(metaKey => {
        const metadata = propertyKey
            ? Reflect.getOwnMetadata(metaKey, from, propertyKey)
            : Reflect.getOwnMetadata(metaKey, from);
        if (propertyKey) {
            Reflect.defineMetadata(metaKey, metadata, to, propertyKey);
        }
        else {
            Reflect.defineMetadata(metaKey, metadata, to);
        }
    });
}