feat(runtime): add nullability annotations to NativeScript.h

[adrian-niculescu]

The embedder header has no nullability annotations, so a Swift embedder sees every pointer in Config and NativeScript as implicitly unwrapped. The implementation already has a clear contract: BaseDir, the script string and the Config argument are required (their UTF8String goes straight into a std::string), ApplicationPath and MetadataPtr fall back to BaseDir/app and the __TNSMetadata section when nil, Arguments is only read when IsDebug is set, and initWithConfig: never returns nil.

This wraps the header in NS_ASSUME_NONNULL and marks the three optional properties nullable, so Swift imports them as String? / UnsafeMutableRawPointer? / an optional argv and the rest as non-optional. No change for Objective-C callers; the in-repo consumers (TestRunner, AppWithModules, the project templates) already set the required fields. A nil Arguments with a stale ArgumentsCount made debug startup index a null argv; the inspector gets a count of 0 in that case.

Checked with clang -fsyntax-only -Wnullability-completeness -Werror in both Objective-C and Objective-C++, with a Swift type-check of the imported API, and with the TestRunner suite on the iOS simulator.

Summary by CodeRabbit

• Bug Fixes
  • Clarified nullability for application configuration properties.
  • Improved compatibility for configurations where application paths, metadata, or arguments may be absent.
  • Prevented invalid inspector connection setup when no application arguments are provided.
  • Preserved configured argument counts when application arguments are available.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

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Reviewing files that changed from the base of the PR and between d02c8e4 and 036fe4e.

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• NativeScript/NativeScript.mm

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📝 Walkthrough

Walkthrough

The Config interface now uses explicit nullability annotations. ApplicationPath, MetadataPtr, and Arguments are nullable. Inspector connection setup passes zero for the argument count when Arguments is nil.

Changes

Config nullability and inspector arguments

Layer / File(s)	Summary
Update Config nullability contract NativeScript/NativeScript.h	The header adds an assumed nonnull region and marks ApplicationPath, MetadataPtr, and Arguments as nullable. The region closes at the end of the header.
Normalize inspector argument count NativeScript/NativeScript.mm	Inspector connection setup passes zero when config.Arguments is nil. Non-nil argument arrays retain the configured count.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 036fe

The PR clarifies pointer nullability for Swift callers and prevents a nil debug argument list from being indexed with a stale count; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: edusperoni, nathanwalker

Poem

A rabbit checks the header with care
Nullable fields now state what they bear
Nil arguments bring a count of zero
The inspector flow stays clear and narrow
Contracts close with markings bright
Hoppy review ends just right

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: adding nullability annotations to NativeScript.h. The additional nil Arguments fix is secondary.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@NativeScript/NativeScript.h`:
- Line 13: Update the Arguments property declaration to use a nonnull element
pointer with a nullable outer array, then adjust
JsV8InspectorClient::enableInspector to safely handle a nil Arguments array when
ArgumentsCount indicates entries before passing elements to strcmp.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 353f5e4d-1bba-485f-88c7-a757f124635f

📥 Commits

Reviewing files that changed from the base of the PR and between 686157b and d02c8e4.

📒 Files selected for processing (1)

• NativeScript/NativeScript.h

Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review.