feat: Extend AWS provider schema to support Fn::ToJsonString in environment variable

[jurriaanpro]

Closes: #11409

[codecov]

Codecov Report

Base: 85.79% // Head: 85.79% // No change to project coverage 👍

Coverage data is based on head (204a39f) compared to base (d2b6926).
Patch has no changes to coverable lines.

❗ Current head 204a39f differs from pull request most recent head 94272be. Consider uploading reports for the commit 94272be to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11461   +/-   ##
=======================================
  Coverage   85.79%   85.79%           
=======================================
  Files         314      314           
  Lines       13259    13259           
=======================================
  Hits        11375    11375           
  Misses       1884     1884           

Impacted Files	Coverage Δ
lib/plugins/aws/provider.js	94.67% <ø> (ø)

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[ronkorving]

First of all, thank you so much for this PR! I'm really looking forward to seeing this land.

This may be out of scope, and not something I really need myself. But just wanted to raise it as a topic of interest. Environment variables inevitably will not be the only place where this will be useful.

For example, when crafting a CloudWatch Dashboard under Resources, ToJsonString would allow people to use YAML to define a dashboard and have it convert to an unwieldy JSON string through this method.

    MyDashboard:
      Type: AWS::CloudWatch::Dashboard
      Properties:
        DashboardName: MyDashboard
        DashboardBody: !ToJsonString
          etc:

This is the best example I could come up with, but can imagine there may be more places where people may want to use ToJsonString in their resources-section.

Or is this perhaps a non-issue because nothing is enforced under resources by Serverless?

[jurriaanpro]

@ronkorving I think nothing is enforced under resources so long as you have a valid CloudFormation template. As mentioned in #11409, you'd need to include Transform: AWS::LanguageExtensions in your template as otherwise the Fn::ToJsonString won't be recognized/accepted.

Maybe someone that's deeper into the framework can confirm that.

[jurriaanpro]

@medikoo Coverage failed, but on code I didn't touch. Is there something I can do to fix this?

[medikoo]

@jurriaanpro It looks good. Please see my comments

[jurriaanpro]

@medikoo I've applied the suggested changes. Could you check again?

[medikoo]

@jurriaanpro can you rebase with main branch? I wonder why no github actions were not run - feels as GitHub quirk

[medikoo]

Thank you!