fix: add spaces between different return types of functions

[btea]

Description

It should be consistent with the return type format shown in the table below, with different types separated by |.

Validation

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run node --run test and all tests passed.
• I have check code formatting with node --run format & node --run lint.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Review	Updated (UTC)
api-docs-tooling	Ready	Preview	Dec 24, 2025 11:22pm

[Copilot]

Pull request overview

This PR addresses formatting inconsistency in function return types by ensuring that union types (separated by |) have consistent spacing. The change modifies the signature generation logic to normalize return type formatting from string|number to string | number, matching the documentation table format.

Key Changes

• Modified return type string processing to split on pipes, trim whitespace, and rejoin with proper spacing
• Applied formatting normalization to all function and method signatures

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[avivkeller]

I wonder if this can be done in CSS, since each word is its own span

[btea]

before	after

I think it should still be handled in the JavaScript. Based on the current page rendering, it seems that |undefined will be placed in the same span.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.03%. Comparing base (776dd0b) to head (8b40c89).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   79.82%   80.03%   +0.20%     
==========================================
  Files         121      122       +1     
  Lines       12017    12066      +49     
  Branches      840      848       +8     
==========================================
+ Hits         9593     9657      +64     
+ Misses       2421     2406      -15     
  Partials        3        3              

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