/** An optimistic-concurrency check failed (stale `expectedVersion` or a lost commit race). */
export class ConcurrencyError extends Error {
  constructor(
    readonly stream: string,
    readonly expectedVersion: number | 'any',
    readonly actualVersion: number,
  ) {
    super(`Concurrency conflict on "${stream}": expected version ${expectedVersion}, actual ${actualVersion}`)
    this.name = 'ConcurrencyError'
  }
}

/** A key argument was passed but is `undefined`/`null`, empty, or not a string/number. */
export class InvalidKeyError extends TypeError {
  constructor(message: string) {
    super(message)
    this.name = 'InvalidKeyError'
  }
}