/**
 * Validate a relative physical artifact path that must behave consistently on
 * every supported host. URL-valued browser assets intentionally use a
 * different contract and must not be passed to this helper.
 */
export declare function assertPortableRelativeArtifactPath(value: unknown, field: string, kind?: string): string;
/**
 * Validate a physical artifact path that is also projected into a browser URL.
 * `#` and `%` have URL-level meaning and cannot be round-tripped from a raw
 * manifest path without an explicit encoding contract.
 */
export declare function assertPortableRelativeBrowserArtifactPath(value: unknown, field: string): string;
/** Key used by case-insensitive, Unicode-normalizing file systems. */
export declare function canonicalPortableArtifactPathKey(value: string): string;
/**
 * Whether two physical file reservations collide or require one file to be an
 * ancestor directory of the other on a portable file system.
 */
export declare function portableArtifactPathsConflict(left: string, right: string): boolean;
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