export declare const SCALE_TYPES: readonly ["sequential", "diverging", "threshold", "sqrt", "log", "pow"];
export type ScaleType = (typeof SCALE_TYPES)[number];
export declare function isScaleType(name: string): name is ScaleType;
/** A resolved, callable D3 scale — `(value) => output`. */
export type CompiledScale = (value: number) => unknown;
export declare function buildScale(type: ScaleType, range: unknown[], domain: number[]): CompiledScale;
/**
 * `colorRamp(value, domain, colors)` — the doc names this as a registered
 * built-in alongside scale()/clamp()/lerp() without giving a worked example;
 * implemented as sugar for a two-stop-or-more sequential color scale, the
 * natural reading of "ramp a value across a set of colors".
 */
export declare function buildColorRamp(domain: [number, number], colors: string[]): CompiledScale;