import type { TradeEvent } from "../types";
export interface TradeMarker {
    y: number;
    label: string;
    green: boolean;
    alpha: number;
}
export interface StreamLabel {
    y: number;
    text: string;
    green: boolean;
    life: number;
    maxLife: number;
    intensity: number;
}
export interface TradeStreamState {
    labels: StreamLabel[];
    spawnTimer: number;
    smoothSpeed: number;
    lastSeenTime: number;
}
export declare function createTradeStreamState(): TradeStreamState;
export declare const MAX_LABELS = 50;
export declare const LABEL_LIFETIME = 6;
/**
 * Advance the trade stream state by one frame.
 * Spawns labels from new trades at `chartBottom`, scrolls them upward with
 * deceleration, and expires labels that reach the top or run out of life.
 *
 * Pure worklet — no Skia imports. Mutates `state` in place.
 */
export declare function tickTradeStream(state: TradeStreamState, trades: TradeEvent[], dtMs: number, chartTop: number, chartBottom: number): void;
/**
 * Convert internal StreamLabel state to TradeMarker array for the overlay.
 * Computes per-label alpha from fadeIn, fadeOut, and intensity.
 */
export declare function projectLabels(state: TradeStreamState, chartTop: number, chartH: number): TradeMarker[];
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