export type IPackageRef = {
    name: string;
    version?: string;
    subpath?: string;
};
export declare class PackageRef implements IPackageRef {
    readonly name: string;
    readonly version?: string;
    readonly subpath?: string;
    constructor(input: string | IPackageRef, version?: string, subpath?: string);
    static parse(input: string): PackageRef;
    static fromUrl(url: string): PackageRef | undefined;
    format(): string;
    root(): string;
    static rootOf(pkg: string): string;
    withVersion(v: string | undefined): PackageRef;
    static isBare(pkg: string): boolean;
}
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