import type { NeoAccent } from './neopop';
export declare function formatNumber(n: number): string;
export declare function formatUsd(n: number): string;
/** Tight axis label — never wider than five glyphs. */
export declare function formatAxisUsd(n: number): string;
export declare function formatPct(n: number): string;
/** `2026-03-04` -> `Mar 4`. Parsed as a local date so no timezone drift. */
export declare function formatDayLabel(iso: string): string;
export declare function formatDayLong(iso: string): string;
export type AuthBucket = 'api' | 'oauth' | 'subscription';
export declare const AUTH_LABEL: Record<AuthBucket, string>;
/**
 * Blue = metered spend, lime = covered by an OAuth plan, yellow = flat-rate
 * subscription. Coral stays reserved for errors and regressions.
 */
export declare const AUTH_ACCENT: Record<AuthBucket, NeoAccent>;
export declare const AUTH_BUCKETS: AuthBucket[];
/** Provider/model `authType` values collapse into the three billing buckets. */
export declare function bucketOf(authType: string): AuthBucket;
export declare function authTag(authType: string): string;
/**
 * Prompt-token counts, split the way the server stores them: `inputTokens`
 * excludes cache reads and cache writes, so the three add up to the full
 * prompt.
 */
export interface CacheCounts {
    inputTokens: number;
    cachedInputTokens: number;
    cacheCreationInputTokens: number;
}
/** Total prompt tokens, cached and uncached. */
export declare function promptTokens(counts: CacheCounts): number;
/**
 * Share of prompt tokens served from the provider cache, as a percentage.
 * Returns `null` when there were no prompt tokens at all, which is distinct
 * from a genuine 0% hit rate.
 */
export declare function cacheHitRate(counts: CacheCounts): number | null;
/** Warm caches are good, so the scale runs coral → yellow → lime. */
export declare function cacheAccent(rate: number): NeoAccent;
/** Signed percentage change, or `null` when the baseline is empty. */
export declare function deltaPct(current: number, previous: number): number | null;
export declare function formatDelta(pct: number): string;
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