How to use the decoders.array function in decoders

export interface LabeledEnvInit extends LabeledMsg {
  /** Message identifier */
  msgType: 'env_init';
  /** Environment data */
  msg: SetupData;
}

/* @external */
const envDecoder: Decoder = object({
  msgType: constant<'env_init'>('env_init'),
  msg: object({
    locale: string,
    hostRootUrl: string,
    assignedRoute: string,
    registeredKeys: optional(
      array(
        object({
          key: string,
          altKey: optional(boolean),
          ctrlKey: optional(boolean),
          metaKey: optional(boolean),
          shiftKey: optional(boolean)
        })
      )
    ),
    custom: mixed
  })
});

export { startedDecoder, envDecoder };

/**