export declare abstract class Target {
    abstract accepts(x: Target): boolean;
    abstract describe(): string;
    static get spec(): import("../../utils").SpecFun<NodeTarget | BrowserTarget | AnyTarget>;
}
export declare class NodeTarget extends Target {
    accepts(x: Target): boolean;
    describe(): string;
    static get spec(): import("../../utils").SpecFun<NodeTarget>;
}
export declare class BrowserTarget extends Target {
    accepts(x: Target): boolean;
    describe(): string;
    static get spec(): import("../../utils").SpecFun<BrowserTarget>;
}
export declare class AnyTarget extends Target {
    accepts(x: Target): boolean;
    describe(): string;
    static get spec(): import("../../utils").SpecFun<AnyTarget>;
}