Error triggered on amplify push/pull after deleting then adding new fields to a custom Graphql type

[MattWlodarski]

How did you install the Amplify CLI?

npm

If applicable, what version of Node.js are you using?

v20

Amplify CLI Version

12.10.1

What operating system are you using?

Mac

Did you make any manual changes to the cloud resources managed by Amplify? Please describe the changes made.

No

Describe the bug

I ran a successful amplify push request for our graphql API. In this request, the only thing we changed was removing two String array fields from a custom type and adding some new fields to the same custom type. This type is not a model - it's being referenced in a model. After the successful push, whenever we try to perform another push command we get the following error:

PushResourcesFault: Cannot read properties of undefined (reading 'map')
at AmplifyToolkit.pushResources (/snapshot/amplify-cli/build/node_modules/@aws-amplify/cli-internal/lib/extensions/amplify-helpers/push-resources.js:116:23)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.executeAmplifyCommand (/snapshot/amplify-cli/build/node_modules/@aws-amplify/amplify-category-function/lib/index.js:277:5)
at async executePluginModuleCommand (/snapshot/amplify-cli/build/node_modules/@aws-amplify/cli-internal/lib/execution-manager.js:139:5)
at async executeCommand (/snapshot/amplify-cli/build/node_modules/@aws-amplify/cli-internal/lib/execution-manager.js:37:9)
at async Object.run (/snapshot/amplify-cli/build/node_modules/@aws-amplify/cli-internal/lib/index.js:121:5)

I'm assuming that the system still thinks the original two string array fields still exist but it can't find them so it throws this map error. I've tried running an amplify pull but I get a very similar error. So, at this point I'm stuck and can't update or pull my API at all.

Expected behavior

Amplify push command should run successfully without the aforementioned error.

Reproduction steps

1. Create a model and a custom type. Reference the custom type in your model.
2. Make sure the custom type has a string array field then push your changes
3. After pushing your changes, remove the string array field from your custom type and add some other fields
4. Push your changes again
5. Afterwards, future push attempts will fail due to the bug I mentioned above.

Project Identifier

No response

Log output

# Put your logs below this line

Additional information

No response

Before submitting, please confirm:

• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.
• I have removed any sensitive information from my code snippets and submission.

[MattWlodarski]

Apparently I was missing:
"providers": [
"awscloudformation"
],

in my project-config.json file. I've never had this in there before (this is an old project) so I'm not sure why it triggered the error now.

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