/**
 * The whole-number env grammar, with one deliberate narrowing against the reference harness: no
 * `parseInt` prefix leg, so `"30s"` is a REJECTION rather than `30` — "a typo silently becomes a budget" is
 * the class of defect this chokepoint exists to close, and the prefix leg is survivable upstream only
 * because its clamp floor catches the result. What IS accepted is what an operator plausibly means: plain
 * digits (an explicit sign included), scientific notation, and digit grouping — the last one because this
 * repository writes its own constants that way (`100_000_000`), and copying a source literal into the
 * environment must not silently become `100`. Hex, octal and every other spelling are rejected.
 */
export declare function parseWholeNumber(raw: string): number | undefined;
/** What a knob is a budget OF — the unit word the invalid-value announcement names. */
export type EnvBudgetUnit = "characters" | "tokens" | "milliseconds";
/** One knob's contract: its name, its unit, the value in force when it is absent or invalid (`undefined`
 *  = "a downstream built-in default stands", the SDK-timeout shape), and the range it is held to. */
export interface EnvBudgetSpec<D extends number | undefined> {
    readonly name: string;
    readonly unit: EnvBudgetUnit;
    readonly default: D;
    /** Inclusive floor; a smaller value is raised to it, loudly. */
    readonly min?: number;
    /** Inclusive ceiling; a larger value is capped to it, loudly. */
    readonly max?: number;
}
/**
 * Resolve one knob from its raw environment string (see the module note for the four states).
 *
 * @contract env_budget.single_resolver — every process-level numeric env knob resolves through this
 * function: one grammar, one range rule, one loud outlet. A knob resolved elsewhere is a fork of this
 * contract, not a knob.
 */
export declare function resolveEnvBudget<D extends number | undefined>(rawEnv: string | undefined, spec: EnvBudgetSpec<D>): number | D;