/**
 * A decimal as an exact integer of `units` scaled by 10^-`scale`. Costs are compared across a
 * language boundary, so a binary float would make the comparison depend on representation: two
 * sides that agree on the value could disagree on the bytes. BigInt units never do.
 */
export interface DecimalValue {
    readonly units: bigint;
    readonly scale: number;
}
export declare class DecimalTextError extends Error {
    constructor(text: string);
}
export declare function isDecimalText(text: unknown): text is string;
export declare function parseDecimal(text: string): DecimalValue;
/** Renders with trailing fraction zeros stripped, matching the proxy's own decimal serialiser. */
export declare function decimalText(value: DecimalValue): string;
export declare function subtractDecimal(left: DecimalValue, right: DecimalValue): DecimalValue;
export declare function multiplyDecimal(left: DecimalValue, right: DecimalValue): DecimalValue;
export declare function compareDecimal(left: DecimalValue, right: DecimalValue): number;
export declare function absDecimal(value: DecimalValue): DecimalValue;
export declare function maxDecimal(left: DecimalValue, right: DecimalValue): DecimalValue;
/**
 * The one lossy step in the pipeline, isolated here on purpose: a journal cost arrives as a
 * JavaScript number and its shortest round-tripping decimal is the most that value can honestly
 * claim. Everything downstream of this call is exact.
 */
export declare function decimalFromNumber(value: number): DecimalValue;