/** @module errors */
/**
* Placeholder class for an error that is thrown when a ship is placed
* in an invalid position.
* @extends Error
*/
export class InvalidShipPlacementError extends Error {}
/**
* Error thrown when the program tries to advance the state, but it is
* invalid.
* @extends Error
*/
export class InvalidAdvanceStateError extends Error {}
/**
* Error thrown when a missile is fired at an invalid cell.
* @extends Error
*/
export class InvalidMissileFireAttemptError extends Error {}