snapshot of https://github.com/shadcn-ui/ui.git (main, 2026-09-15; blobs > 131072B omitted)

apps/v4/app/(app)/(create)/lib/randomize-biases.ts

@@ -0,0 +1,113 @@
+import type {
+  BaseColor,
+  BaseColorName,
+  Radius,
+  StyleName,
+  Theme,
+  ThemeName,
+} from "@/registry/config"
+
+import { type FONTS } from "./fonts"
+
+export type RandomizeContext = {
+  style?: StyleName
+  baseColor?: BaseColorName
+  theme?: ThemeName
+  chartColor?: string
+  iconLibrary?: string
+  font?: string
+  menuAccent?: string
+  menuColor?: string
+  radius?: string
+}
+
+export type BiasFilter<T> = (
+  items: readonly T[],
+  context: RandomizeContext
+) => readonly T[]
+
+export type RandomizeBiases = {
+  baseColors?: BiasFilter<BaseColor>
+  chartColors?: BiasFilter<Theme>
+  fonts?: BiasFilter<(typeof FONTS)[number]>
+  radius?: BiasFilter<Radius>
+}
+
+// Theme → chart color pairings for randomization.
+const CHART_COLOR_PAIRINGS: Record<string, string[]> = {
+  red: ["teal", "sky"],
+  orange: ["teal", "blue"],
+  amber: ["cyan", "indigo"],
+  yellow: ["sky", "violet"],
+  lime: ["indigo", "pink"],
+  green: ["purple", "rose"],
+  emerald: ["purple", "red"],
+  teal: ["fuchsia", "red"],
+  cyan: ["rose", "amber"],
+  sky: ["red", "yellow"],
+  blue: ["orange", "yellow"],
+  indigo: ["amber", "yellow"],
+  violet: ["yellow", "lime"],
+  purple: ["green", "lime"],
+  fuchsia: ["lime", "teal"],
+  pink: ["green", "cyan"],
+  rose: ["emerald", "sky"],
+}
+
+/**
+ * Configuration for randomization biases.
+ * Add biases here to influence random selection based on context.
+ */
+export const RANDOMIZE_BIASES: RandomizeBiases = {
+  baseColors: (baseColors) => {
+    return baseColors.filter((c) => c.name !== "gray")
+  },
+  fonts: (fonts, context) => {
+    // When style is lyra, only use mono fonts.
+    if (context.style === "lyra") {
+      return fonts.filter((font) => font.value === "jetbrains-mono")
+    }
+
+    return fonts
+  },
+  radius: (radii, context) => {
+    // When style is lyra, always use "none" radius.
+    if (context.style === "lyra") {
+      return radii.filter((radius) => radius.name === "none")
+    }
+
+    // Rhea does not support the "large" radius.
+    if (context.style === "rhea") {
+      return radii.filter((radius) => radius.name !== "large")
+    }
+
+    return radii
+  },
+  chartColors: (chartColors, context) => {
+    // When theme has a pairing, restrict chart colors to the paired values.
+    const pairing = context.theme ? CHART_COLOR_PAIRINGS[context.theme] : null
+    if (pairing) {
+      const filtered = chartColors.filter((c) => pairing.includes(c.name))
+      if (filtered.length > 0) {
+        return filtered
+      }
+    }
+
+    return chartColors
+  },
+}
+
+/**
+ * Applies biases to a list of items based on the current context.
+ */
+export function applyBias<T>(
+  items: readonly T[],
+  context: RandomizeContext,
+  biasFilter?: BiasFilter<T>
+): readonly T[] {
+  if (!biasFilter) {
+    return items
+  }
+
+  return biasFilter(items, context)
+}