import { StringDict } from "../../parsing/common";
import { Polygon } from "../../geometry";
/**
 * The size of a single serving of the product.
 */
export declare class NutritionFactsLabelV1ServingSize {
    #private;
    /** The amount of a single serving. */
    amount: number | null;
    /** The unit for the amount of a single serving. */
    unit: string | null;
    /** Confidence score */
    confidence: number;
    /** The document page on which the information was found. */
    pageId: number;
    /**
     * Contains the relative vertices coordinates (points) of a polygon containing
     * the field in the document.
     */
    polygon: Polygon;
    constructor({ prediction }: StringDict);
    /**
     * Default string representation.
     */
    toString(): string;
    /**
     * Output in a format suitable for inclusion in a field list.
     */
    toFieldList(): string;
}