fix: failing to get correct region when it is configured with variables

[gjhommersom]

Proposed changes

Defer loading of the region until Serverless has resolved the configuration.
https://www.serverless.com/framework/docs/guides/plugins/creating-plugins#serverless-instance

Issue(s)

This fixes an issue introduced in version 2.11 that stops the region configuration from being loaded properly.

Steps to test or reproduce

Trying to run serverless deploy with a configuration like below will fail because the region is invalid.

provider:
  name: aws
  region: ${opt:region, param:provider_region}
params:
  default:
    provider_region: eu-west-1

  prod:
    provider_region: eu-central-1

Summary by CodeRabbit

• Bug Fixes
  • Improved plugin startup behavior by delaying cloud configuration lookup until it is actually needed.
  • Reduced the chance of initialization issues when region or credentials are not immediately available.
  • This should make deploy and command execution more reliable in environments with deferred AWS setup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2f5efe2f-388f-4f68-b4ca-f870cdfddc72

📥 Commits

Reviewing files that changed from the base of the PR and between ddb9896 and 903b712.

📒 Files selected for processing (1)

• src/index.ts

---

📝 Walkthrough

Walkthrough

The ServerlessAppsyncPlugin constructor no longer eagerly resolves AWS region and credentials to build AwsClientFactory. Instead, an optional backing field is stored, and a private getter lazily initializes and caches the factory on first access.

Changes

Lazy client factory initialization

Layer / File(s)	Summary
Deferred AwsClientFactory construction src/index.ts	Constructor no longer eagerly resolves region/credentials or constructs AwsClientFactory; a private clientFactory getter now lazily resolves and caches it on first access.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• sid88in/serverless-appsync-plugin#686: Introduces and wires AwsClientFactory into the plugin initialization flow that this PR modifies to be lazy.

Suggested reviewers: AlexHladin

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main fix: delaying region resolution when the region is configured via variables.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[sid88in]

lgtm. thanks for the fix!