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Icon — spec

Synthesized from MUI Icon/SvgIcon and Ant Design Icon. The base primitive for rendering icons. Pairs with knowledge/icons/curated-sets.md for icon-set selection.

When to use

  • Inline icons in buttons, links, list items.
  • Decorative or status indicators.
  • As building blocks for IconButton, Avatar, Toast.

API

<Icon as={CheckIcon} />
<Icon size="md" color="brand" />
<Icon as={WarningIcon} aria-label="Warning" />
Prop Type Default Description
as ComponentType required The actual icon SVG component (Phosphor, Lucide, etc)
size "xs" \| "sm" \| "md" \| "lg" \| "xl" \| number "md" Pixel size
color "current" \| "brand" \| "muted" \| "success" \| "warning" \| "error" "current" Color via token
weight "thin" \| "light" \| "regular" \| "bold" \| "fill" "regular" Phosphor-style weight (if icon set supports)
aria-label string — Required for meaningful icons
aria-hidden boolean auto True for decorative

Sizes

Size px
xs 12
sm 16
md (default) 20-24
lg 32
xl 48

Color via currentColor

<svg viewBox="0 0 24 24" fill="currentColor">
  <path d="..." />
</svg>

The icon SVG should use fill="currentColor" (or stroke="currentColor" for stroke-style). Icon component sets the parent color token; SVG inherits.

.icon[data-color="brand"]   { color: var(--color-brand-default); }
.icon[data-color="muted"]   { color: var(--color-fg-muted); }
.icon[data-color="success"] { color: var(--color-success-default); }
.icon[data-color="warning"] { color: var(--color-warning-default); }
.icon[data-color="error"]   { color: var(--color-error-default); }

Accessibility

Use Pattern
Decorative (label-redundant) aria-hidden="true"
Meaningful (no adjacent label) <span role="img" aria-label="..."> wrapper
Inside button text label aria-hidden="true" (button label conveys meaning)
Inside icon-only button label on the button, NOT the icon 
{/* Decorative inside text-labeled button */}
<button>
  <Icon as={SaveIcon} aria-hidden /> 저장
</button>

{/* Meaningful icon-only button */}
<button aria-label="저장">
  <Icon as={SaveIcon} aria-hidden />
</button>

Icon-set conventions

  • Pick one set per project (Phosphor, Lucide, Heroicons, Material Icons).
  • Don't mix stroke and fill icon sets — visual inconsistency.
  • For Phosphor: weights (thin / light / regular / bold / fill) accepted.
  • For Lucide / Heroicons: stroke-only; uniform line weight.

See knowledge/icons/curated-sets.md.

Don't

  • Don't use color alone to convey state. Pair with adjacent text or shape.
  • Don't render icon SVG inline without aria-hidden if it's decorative.
  • Don't use <i className="icon-..."> icon-font pattern. Bad a11y, no theming.
  • Don't render at non-multiple-of-2 sizes (15px). Stays sharp on retina at 16/20/24.

References

  • MUI: SvgIcon
  • Phosphor Icons: 1200+ icons, 5 weights
  • Lucide: stroke-only minimalist set

Cross-reference