tweak(tupaiaWeb): format numbers with thousands separators

[jaskfla]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @jaskfla, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly upgrades the application's data formatting utility, formatDataValueByType, to provide more user-friendly and accurate numerical representations. The changes primarily focus on introducing thousands separators for better readability of large numbers and refining the logic for percentage formatting to be more robust, especially for negative values and edge cases. Accompanying these functional improvements is a substantial increase in unit test coverage, ensuring the reliability of the formatting utility across all supported data types. Additionally, minor TypeScript enhancements were made to improve type safety.

Highlights

• Enhanced Number Formatting: Implemented thousands separators for 'number', 'oneDecimalPlace', and default formatting types, improving readability for large numerical values across the application.
• Improved Percentage Formatting Logic: Refined the percentage formatting to handle negative values correctly and ensure consistent rounding behavior across different magnitudes (e.g., <1%, [1%, 100%), >=100%).
• Robust Data Type Handling: Replaced isNaN with Number.isNaN for more reliable checks and introduced a specific fix to prevent numeral.js from returning NaN for very small numerical inputs.
• Expanded Test Coverage: Added comprehensive unit tests for all VALUE_TYPES (boolean, currency, fraction, number, percentage, etc.) to validate the new formatting logic and ensure correctness across various edge cases.
• TypeScript Type Safety: Applied as const assertions to VALUE_TYPES and VIEWS objects, enhancing type inference and immutability for improved code quality and maintainability.

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Changelog

• packages/tupaia-web/src/features/Visuals/View/View.tsx
  • Added as const assertion to the VIEWS object for improved TypeScript type inference.
• packages/utils/src/tests/formatDataValue.test.js
  • Expanded test suite to include new test cases for boolean, currency, fraction, number, number and percentage, one decimal place, and text value types.
  • Updated existing percentage tests to cover negative values and various rounding scenarios more thoroughly.
• packages/utils/src/formatDataValueByType.js
  • Updated VALUE_TYPES and VALUE_TYPE_TO_FORMATTER with as const and Object.freeze for type safety and immutability.
  • Replaced isNaN with Number.isNaN in several functions for more accurate NaN checks.
  • Modified the percentage formatter to correctly handle negative percentages and refine decimal precision logic based on magnitude.
  • Implemented thousands separators (0,0) in the number, oneDecimalPlace, and defaultFormatter functions.
  • Added a hacky fix to the number formatter to prevent numeral.js from returning NaN for extremely small numerical values.

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[gemini-code-assist]

Code Review

This pull request enhances number formatting by adding thousands separators, which improves readability. The changes are well-tested with a comprehensive suite of new unit tests covering various data types and edge cases, including negative values. The codebase is also improved by using modern JavaScript features like nullish coalescing and const assertions for better type safety.

My main feedback is regarding a workaround for a numeral.js bug, where I've suggested an improvement for better code clarity and maintainability.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}

[cursor]

Empty string total bypasses fraction's "No data" guard

Medium Severity

The fraction function's guard total === null || Number.isNaN(Number(total)) doesn't catch an empty string total, because Number('') evaluates to 0 (not NaN). When total is '', the function returns "0/" instead of 'No data'. The newly added test expects 'No data' for this case, confirming the intended behavior doesn't match the implementation.

Additional Locations (1)

• packages/utils/src/__tests__/formatDataValue.test.js#L132-L134