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Файл db.js при проверке с помощью flow выдает ошибки

При проверке файла db.js с помощью flow выдаются следующие ошибки:

Error: src/db.js:20
                 v-----------------------------------------------------
 20:             connection.query(sql, val, (err, results, fields) => {
 21:               if(err) {
 22:                 reject(err)
...:
 27:             })
                 -^ call of method `query`. Method cannot be called on possibly undefined value
 20:             connection.query(sql, val, (err, results, fields) => {
                 ^^^^^^^^^^ undefined (too few arguments, expected default/rest parameters)

Error: src/db.js:26
 26:               connection.release()
                   ^^^^^^^^^^^^^^^^^^^^ call of method `release`. Method cannot be called on possibly undefined value
 26:               connection.release()
                   ^^^^^^^^^^ undefined (too few arguments, expected default/rest parameters)

Пока решение данной проблемы не нашел, вернусь к ней позже, пока отлючил проверку через flow в данном файле.

Продумать структуру базы данных

Какие данные необходимо сохранить в базе данных приложения?

  • Название магазина
  • Название продукта
  • Стоимость продукта
  • Дата покупки
  • Кол-во купленного товара

Структра базы данных приложения

Таблица shop

  • id
  • name

Таблица product

  • id
  • name
  • id_category

Таблица category

  • id
  • name

Таблица buy

  • id
  • date
  • id_shop
  • id_product
  • price
  • count

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