@livy/util/lib/handlers/is-formattable-handler-interface.mjs

Common utilities for the Livy logger

/**
 * Check whether a value implements the FormattableHandlerInterface
 *
 * @param value The value to check
 */
export function isFormattableHandlerInterface(value) {
    if (typeof value !== 'object' || value === null) {
        return false;
    }
    const descriptor = Object.getOwnPropertyDescriptor(value, 'formatter');
    if (descriptor) {
        return ((typeof descriptor.get === 'function' &&
            typeof descriptor.set === 'function') ||
            (Reflect.has(descriptor, 'value') &&
                typeof descriptor.value === 'object' &&
                descriptor.value !== null));
    }
    else {
        return typeof value.formatter === 'object' && value.formatter !== null;
    }
}