How to use the @requestnetwork/types.ExtensionTypes.TYPE function in @requestnetwork/types

if (requestState.extensions[ExtensionTypes.ID.CONTENT_DATA]) {
    throw Error(`This extension has already been created`);
  }

  if (!extensionAction.parameters.content) {
    throw Error('No content has been given for the extension content-data');
  }

  // Deep copy to not mutate the input parameter
  const copiedExtensionState: RequestLogicTypes.IExtensionStates = Utils.deepCopy(extensionsState);

  copiedExtensionState[ExtensionTypes.ID.CONTENT_DATA] = {
    events: [],
    id: ExtensionTypes.ID.CONTENT_DATA,
    type: ExtensionTypes.TYPE.CONTENT_DATA,
    values: { content: extensionAction.parameters.content },
    version: CURRENT_VERSION,
  };

  return copiedExtensionState;
}

) {
    throw Error('refundAddress is not a valid address');
  }
  return {
    events: [
      {
        name: 'create',
        parameters: {
          paymentAddress: extensionAction.parameters.paymentAddress,
          refundAddress: extensionAction.parameters.refundAddress,
        },
        timestamp,
      },
    ],
    id: extensionAction.id,
    type: ExtensionTypes.TYPE.PAYMENT_NETWORK,
    values: {
      paymentAddress: extensionAction.parameters.paymentAddress,
      refundAddress: extensionAction.parameters.refundAddress,
    },
    version: CURRENT_VERSION,
  };
}

function applyCreation(extensionAction: ExtensionTypes.IAction, timestamp: number): ExtensionTypes.IState {
  return {
    events: [
      {
        name: 'create',
        parameters: {
          paymentInfo: extensionAction.parameters.paymentInfo,
          refundInfo: extensionAction.parameters.refundInfo,
        },
        timestamp,
      },
    ],
    id: extensionAction.id,
    type: ExtensionTypes.TYPE.PAYMENT_NETWORK,
    values: {
      paymentInfo: extensionAction.parameters.paymentInfo,
      receivedPaymentAmount: '0',
      receivedRefundAmount: '0',
      refundInfo: extensionAction.parameters.refundInfo,
      sentPaymentAmount: '0',
      sentRefundAmount: '0',
    },
    version: CURRENT_VERSION,
  };
}

      extension => extension.type === ExtensionTypes.TYPE.PAYMENT_NETWORK,
    );