refactor: optimize autosuggest filterOptions performance

[TrevorBurnham]

Description

This PR optimizes the filterOptions utility in src/autosuggest/utils/utils.ts by applying three micro-optimizations:

1. Hoist field arrays to module scope: Move searchableFields and searchableTagFields arrays outside the matchSingleOption function to avoid recreating them on every call
2. Move toLowerCase() outside the filter loop: The search text is now lowercased once in filterOptions rather than on every matchSingleOption call
3. Replace indexOf() !== -1 with includes(): More idiomatic and slightly faster for substring matching

The filterOptions function is called whenever:

• A user types in an autosuggest input (with filteringType="auto")
• The dropdown options need to be filtered based on the entered text

This is a hot path during user interaction, as filtering runs on every keystroke.

Micro-benchmarks show 10-25% improvement for typical filtering scenarios

How has this been tested?

Existing tests provide extensive coverage for this functionality.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[pan-kot]

The PR needs a conflict resolution with main.

[TrevorBurnham]

The PR needs a conflict resolution with main.

Done!

[pan-kot]

@TrevorBurnham please fix failing tests

[TrevorBurnham]

@TrevorBurnham please fix failing tests

Done!

[pan-kot]

The tests still fail

[Copilot]

🟢 Approval recommended

The changes are localized performance refactors with added test coverage, and the only noted issue is a minor maintainability improvement.

Pull request overview

This PR refactors the Autosuggest filtering hot path (filterOptions) to reduce per-option work during typing, and adds focused unit coverage for the filtering behavior.

Changes:

• Hoists searchable field lists to module scope and lowercases the search text once per filter pass.
• Uses String.prototype.includes for substring checks in matchString.
• Adds unit tests for filterOptions and updates required props for the Autosuggest component test setup.

File summaries

File	Description
src/autosuggest/utils/utils.ts	Applies micro-optimizations in the filtering logic and updates substring matching implementation.
src/autosuggest/tests/utils.test.ts	Adds unit tests covering matching fields/tags, case-insensitivity, group preservation, and empty search behavior.
src/tests/required-props-for-components.ts	Updates Autosuggest required-props defaults to use value instead of enteredPrefix.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.76%. Comparing base (6de850b) to head (5e99841).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4206      +/-   ##
==========================================
- Coverage   97.66%   93.76%   -3.91%     
==========================================
  Files         959      958       -1     
  Lines       31342    27138    -4204     
  Branches    11578     9761    -1817     
==========================================
- Hits        30610    25445    -5165     
+ Misses        686      613      -73     
- Partials       46     1080    +1034     

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