import type { PackageURL } from './package-url.js';
/**
 * Convert PackageURL instance to spec string (without scheme and type).
 *
 * Returns the package identity portion: namespace/name@version?qualifiers#subpath
 * This is the purl equivalent of an npm "spec" — the package identity without
 * the ecosystem prefix.
 *
 * @param purl - PackageURL instance to stringify
 * @returns Spec string (e.g., '%40babel/core@7.0.0' for pkg:npm/%40babel/core@7.0.0)
 *
 * @example
 * ```typescript
 * const purl = new PackageURL('npm', '@babel', 'core', '7.0.0')
 * stringifySpec(purl)
 * // -> '%40babel/core@7.0.0'
 * ```
 */
export declare function stringifySpec(purl: PackageURL): string;
/**
 * Convert PackageURL instance to canonical PURL string.
 *
 * Serializes a PackageURL object into its canonical string representation
 * according to the PURL specification.
 *
 * @param purl - PackageURL instance to stringify
 * @returns Canonical PURL string (e.g., 'pkg:npm/lodash@4.17.21')
 *
 * @example
 * ```typescript
 * const purl = new PackageURL('npm', undefined, 'lodash', '4.17.21')
 * stringify(purl)
 * // -> 'pkg:npm/lodash@4.17.21'
 * ```
 */
export declare function stringify(purl: PackageURL): string;