/** A parsed semantic version. Prerelease is captured but never compared. */
export type SemVer = {
    major: number;
    minor: number;
    patch: number;
    prerelease?: string;
};
export type RangeErrorShape = {
    code: 'SEMVER_RANGE_INVALID' | 'SEMVER_INVALID';
    message: string;
    hint: string;
};
export declare class SemVerError extends Error {
    readonly code: RangeErrorShape['code'];
    readonly hint: string;
    constructor(shape: RangeErrorShape);
}
/** Parse `major.minor.patch[-prerelease][+build]`. Throws {@link SemVerError}. */
export declare function parseVersion(input: string): SemVer;
/** -1 / 0 / 1. Prerelease is ignored: the gate compares release lines only. */
export declare function compareVersions(a: SemVer, b: SemVer): number;
/**
 * Does `version` satisfy `range`?
 *
 * Throws {@link SemVerError} on a range this grammar does not accept — loudly,
 * rather than defaulting to permissive. A gate that passes what it cannot parse
 * is not a gate.
 */
export declare function satisfiesRange(version: string | SemVer, range: string): boolean;
/**
 * True if `s` is a bare version rather than a range.
 *
 * The gate accepts a bare version as an exact-match range for backward
 * compatibility with packs written before ranges existed, and ADVISES on it —
 * `engineVersion: '2.0.0'` sitting unread against a 3.8.0 engine is exactly how
 * C0's version skew stayed invisible (REPORT §5, item 2).
 */
export declare function isBareVersion(s: string): boolean;
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