[Issue] Introduced support of custom scalar types for GraphQL schema

[m2-assistant]

This issue is automatically created based on existing pull request: #34651: Introduced support of custom scalar types for GraphQL schema

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Support for GraphQL custom scalars

This PR adds support for custom scalar types to GraphQL.

https://graphql.org/learn/schema/#scalar-types
https://webonyx.github.io/graphql-php/type-definitions/scalars/#writing-custom-scalar-types

After PR is merged a developer will be able to define custom scalar types and implementations by using Magento schema.

For example, the following declaration enables Json scalar type

scalar Json
@implementation(class: "Magento\\MyModule\\Model\\JsonScalarType")
@doc(description:"Json type")
{}

Scalar type implementation should implement new Magento\Framework\GraphQl\Schema\Type\Scalar\CustomScalarInterface

Something like:

class JsonScalarType implements \Magento\Framework\GraphQl\Schema\Type\Scalar\CustomScalarInterface
{

    public function serialize($value)
    {
        return json_decode($value);
    }

    public function parseValue($value)
    {
        return json_encode($value);
    }

    public function parseLiteral($valueNode, ?array $variables = null)
    {
        return $valueNode->value;
    }
}

For example, a query that accepts JSON as input and returns JSON as output and has a resolver that returns you an argument that you just passed then you will see a picture similar to this:

This feature could be widely useful to express values that may have validation, like HTML, emails, URLs, dates, etc., and for more advanced cases like EAV attributes, where value can be expressed as a single scalar or array of scalars.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-7976 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Alfa. Thank you for verifying the issue.
Issue Available: @engcom-Alfa, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[engcom-Alfa]

Hey All

as per discussion with internal team confirmed the ticket

[engcom-November]

Development team is currently working on this issue.
Thank you.

[engcom-Bravo]

Hello,

As I can see this issue got fixed in the scope of the internal Jira ticket AC-7976 by the internal team
Related commits:https://github.com/search?q=repo%3Amagento%2Fmagento2+AC-7976&type=commits

Thanks