fix: improve no theme error messages

[Brentlok]

Summary

Summary by CodeRabbit

• Bug Fixes
  • Improved error messages when no theme is registered or selected, making it clearer how to resolve missing theme issues.
  • Enhanced error handling to provide more specific feedback if a requested theme is not found.

[coderabbitai]

Walkthrough

The internal logic of the getTheme method in the UnistylesRuntime class was updated to include more granular error handling. It now checks for the existence of registered themes and a valid theme name before attempting to retrieve a theme, returning specific error proxies for each failure scenario.

Changes

Files	Change Summary
src/web/runtime.ts	Enhanced getTheme logic with stepwise error handling: checks for registered themes, theme name, and theme existence, returning specific error proxies for each case.

Possibly related PRs

• fix: return first registered theme as default instead of empty object in mocks #828: Modifies the mocked getTheme method to return the first registered theme instead of an empty object; both PRs update getTheme logic but in different contexts (runtime vs mock).

Suggested reviewers

• jpudysz

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e094fb and af25e04.

📒 Files selected for processing (1)

• src/web/runtime.ts (1 hunks)

🧰 Additional context used

🧬 Code Graph Analysis (1)

src/web/runtime.ts (2)

src/types/core.ts (1)

• UnistylesTheme (48-48)

src/web/utils/common.ts (1)

• error (10-10)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: lint

🔇 Additional comments (4)

src/web/runtime.ts (4)

245-246: LGTM: Clear variable naming for theme existence check.

The hasSomeThemes variable clearly indicates the intent to check if any themes have been registered, improving code readability.

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247-253: Excellent improvement: Specific error for missing theme configuration.

This error case provides a clear, actionable message when no themes have been registered at all. The suggestion to call StyleSheet.configure is helpful for developers who may have forgotten this setup step.

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255-261: Great addition: Handles missing theme name scenario.

This addresses the case where themes exist but no specific theme name is provided. The error message appropriately suggests selecting an initial theme, which is different from the previous scenario.

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267-267: Correct logic simplification.

The condition is now appropriately simplified to only check !theme since !themeName is handled in the separate check above. This maintains the existing behavior for when a specific theme is not found.

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