[SelaseKay]

Description

window.flutterfire_ignore_scripts is used to skip auto-injecting selected Firebase JS SDKs (for example Analytics until the user consents). _ignoredServiceScripts treated that window value as a Dart Iterable. That is true under dart2js, where a JS array is a Dart List, but false under dart2wasm, where it stays a JSArray. Wasm builds therefore always saw an empty ignore list and still injected the scripts.

This PR reads the property as a JSArray via isA on the JSAny? from getProperty (available on Dart 3.6+, which this package still supports) and converts entries with JSString.toDart.

Related Issues

Fixes #18804

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

Test plan

In packages/firebase_core/firebase_core_web:

• flutter test --platform chrome — dart2js, including the new ignore-scripts tests
• flutter test --platform chrome --wasm — dart2wasm; the JS-array case failed on main and passes with this change
• CI web jobs for firebase_core_web

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