@a11d/metadata/dist/type.js

A set of behavior-less metadata decorators.

const key = 'design:type';
/**
 * A general-purpose metadata decorator to store the type of a property in runtime.
 */
export function type(type) {
    return (target, propertyKey) => {
        Reflect.defineMetadata(key, type, target, propertyKey);
    };
}
type.get = function (constructor, propertyKey) {
    return !constructor ? undefined : Reflect.getMetadata(key, constructor.prototype, propertyKey);
};
globalThis.type = type;