fix(types): add return type for error()

[danielroe]

🔗 Linked issue

resolves #10507

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds a return type for the error() method.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codesandbox]

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[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0b1a4d3) 66.18% compared to head (c8b508a) 66.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x   #19044   +/-   ##
=======================================
  Coverage   66.18%   66.18%           
=======================================
  Files          93       93           
  Lines        4096     4096           
  Branches     1158     1158           
=======================================
  Hits         2711     2711           
  Misses       1119     1119           
  Partials      266      266           

Flag	Coverage Δ
unittests	66.18% <ø> (ø)

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