**What**
Add support for default sales channel
**How**
- Implement a new method in the salesChannelService `createDefault`
- call the new method above in the default loader
**Test**
- Unit tests of the sales channel service method createDefaulta
- Init default loader unit tests
Fixes CORE-316
### What
At the moment it is not possible to pass explicitly null on a property since the qs.stringify will transform it as `url?property=` which is then interpreted on the backend side as `""` value which is not what we expect.
The actual way to pass null value is to set the property as `{ prop: "null" }` in order to get the stringify method to send it correctly.
### How
I just created a small util that loop through the input object and transform all null values to "null" before being passed to the qs.stringify method.
The new util is only applied on the list batch job since this is for now the only place that require that behaviour.
### What
At the moment, it is not possible to not invalidate any queries>
Example, when we want to Create a new signed url, it does not require to invalidate any of the queries.
But the way it is done in the buildOptions, require to give either a key or an array of keys.
### How
The behaviour for empty array is to invalidate all the queries and here we would like to be able to just pass undefined in order to not trigger the invalidation. The update allow the arg to be optional and check for undefined explicitly before choosing the invalidation
* feat(medusa): Support transformQuery middleware
* feat(medusa): Add support for transformBody
* test(medusa): Fix unit tests
* feat(medusa): Cleanup import
* feat(medusa): Update pipe required fields
* feat(medusa): Cleanup
* feat(medusa): Types cleanup
* feat(medusa): Types cleanup
* feat(medusa): Improve global typings and add one more example
* fix(medusa): Wrong wording in the error for prepareListQuery utility
* refactor(medusa): Move some column to a base entity to make it easier to add new models without forgetting some columns
* styles(medusa): Cleanup models
* fix(medusa): typings due to model typings update
* feat(medusa): Cleanup models
* fix(medusa): A model must not return the generateId as part of the entity
* fix(medusa): Plugin integration snapshot
* fix(medusa): Typings from discount-rule-migration scripts
* refactor(medusa): Introduct BaseEntity/SoftDeletableEntity that the entity extends
* styles(medusa): Fix models linting
* test(medusa): Fix integration plugin tests
* feat(medusa): Create generateEntityId standalong function utility and update config to properly supprt ts spec files
* feat(medusa): Update entities to use the new utils to generate and apply the id
* test(medusa): Fix test suits
* feat(medusa): Improve generateEntityId utility
* feat(medusa): Add /admin/products/:id/variants end point
* test(medusa): Fix get-variants test casees
* feat(medusa): Include the config to the ProdutService#retrieveVariants as a method parameter
* feat(medusa): Improve get-variants endpoint
* feat(medusa): Improve get-variants endpoint
* test(medusa): Fix unit tests
* test(medusa): Fix unit tests
* feat(medusa): Improve typings
* feat(medusa): Update according to feedback
* feat(medusa): Update according to feedback
* test(medusa): Fix list-variants tests
* feat(medusa): Getting the variants from the product end point should use the productVariantService
* fix(medusa): list-variants expand possibly undefined
* Fix(medusa): List-variants endpoint
* fix(medusa): Tests suite for list-variant
* test(integration-tests): Fix yarn lock
* test(integration-tests): Fix yarn lock
* feat(medusa): Improve exported medusa API
Avoid to always have to import from @medusajs/medusa/dist/*
* feat(medusa): The Model loaders should ignore the index file
* fix(medusa): swap model typo
* refactor(medusa): Cleanup + fix
* styles(medusa): Lint
* refactor(medusa): Finalize cleanup
* feat(medusa): Prefer the usage of bulk operations instead of sequential/conccurent operations
* feat(medusa): Improve cart service
* refactor(medusa): Explicitly specifying protected methods when needed as well as enfore the usage of the local transactionManager_ in those methods
* tests(medusa): Fix tests according to the new changes
* feat(medusa): Cleanup after rebase
* test(medusa): Fix cart service tests
* refactor(medusa-interfaces): Migrate baseService to TS + improve the service it self
* feat(medusa,medusa-interfaces): Cleanup and move base-service to medusa core
* medusa(medusa, medusa-interfaces): Improve typings
* medusa(medusa, medusa-interfaces): buildQuery make properties optionals
* feat(medusa-interfaces): Revert temporarly the medusa-interfaces while moving the base-service to the medusa core
* feat(medusa): Improve base-service typings
* feat(medusa): Remove template that is not necessary
At the moment, when the method `shouldRetryCondition` is called, the condition are using OR which does not take in count 0 which is also considered as false
a simple fix is the usage of nullish coalescing
Adrien de Peretti
