export declare class Stack {
    stacks: Record<string, {
        total: number;
        min: number;
        max: number;
    }>;
    values: Record<string, number>;
    normalized: boolean;
    invalid: Record<string, boolean>;
    info?: any[];
    constructor();
    reset(): void;
    acknowledge(ordinal: string, value: number | null): void;
    measure(normalized: boolean): [number, number];
    stack(ordinal: string, value: number | null): number | null;
}
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