export const PARENT = Symbol ( 'parent' ) ; /**
 * SPI extension for listening to removal of a wrapped cache.
 */ export const ON_REMOVE = Symbol ( 'onRemove' ) ; /**
 * Shared symbol used for common code that triggers remove listeners.
 */ export const TRIGGER_REMOVE = Symbol ( 'triggerRemove' ) ; /**
 * SPI extension for listening to eviction events.
 */ export const ON_MAINTENANCE = Symbol ( 'onMaintenance' ) ; /**
 * Shared symbol used for common code related to maintenace.
 */ export const MAINTENANCE = Symbol ( 'maintenance' ) ;