[Studio] Implement format utility functions - #660
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lizhimins merged 2 commits intoJul 31, 2026
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…ay, percent) Replace TODO stub implementations in format.ts with full-featured utilities: - formatDateTime / formatDate: proper date formatting with padding - formatBytes: human-readable 1024-based byte formatting - formatNumber: thousands separator formatting - formatDelay: duration formatting with i18n support (zh/en) - formatPercent: fixed-decimal percentage formatting
Smooth cardinal-spline path, gradient area fill, glow on last-point dot, configurable strokeWidth/showDot/animated, and responsive SVG mode. The MiniBar zero-value change from the original PR is dropped: trunk intentionally renders no visible bar at zero throughput (apache#629).
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Summary
Replace TODO stub implementations in format.ts with full-featured utility
functions used across the dashboard.
formatDateTime(date): Format to 'YYYY-MM-DD HH:mm:ss' with proper paddingformatDate(date): Format to 'YYYY-MM-DD' (was a TODO returning raw string)formatBytes(bytes, decimals?): Human-readable 1024-based formatting(was a TODO returning raw 'X B'), handles zero and negative values
formatNumber(num): Thousands separator formatting (e.g. 1234567 → '1,234,567')formatDelay(seconds, lang?): Duration formatting with i18n support(zh: "22小时55分钟", en: "22h 55m")
formatPercent(value, decimals?): Fixed-decimal percentage formattingAll functions are pure with no side effects, making them easy to test and reuse.
Test plan