export declare const truncate: (value: number, scale: number) => number;
export declare const clamp: (_: {
    value: number;
    min: number;
    max: number;
}) => number;
export declare const canAdd: (_: {
    value: number | null;
    step: number;
    max: number;
    scale: number;
}) => boolean;
export declare const canMinus: (_: {
    value: number | null;
    step: number;
    min: number;
    scale: number;
}) => boolean;
export declare const getDisplayValue: (_: {
    value: number | null;
    scale: number;
    displayRenderer?: (value: number) => string;
}) => string;
/**
 * @param userInput Raw text from the input field, may or may not be convertible to `null` or a valid number
 * @param config    Defines the range and scale of a valid number, and if `null` is allowed to be returned
 * @returns         A number that is ensured to be valid and is not `NaN`; or `null` if `allowNull` is true and `userInput` is an empty string; or `"@@INVALID"` if userInput cannot be converted
 */
export declare const rectifyInputIfValid: (userInput: string, config: {
    min: number;
    max: number;
    scale: number;
    allowNull: boolean;
}) => null | number | "@@INVALID";