/**
 * Normalizes bare npm import specifiers to their package root.
 *
 * @example
 * toPackageRootSpecifier('@scope/pkg/sub/file') -> '@scope/pkg'
 * toPackageRootSpecifier('lodash/debounce') -> 'lodash'
 */
export declare function toPackageRootSpecifier(specifier: string): string;
/**
 * Returns true when `specifier` is a subpath import of `packageRoot`.
 */
export declare function isSubpathOfPackageRoot(specifier: string, packageRoot: string): boolean;