import type Plugin from "../../api/plugin/Plugin.ts";
/**
 * Loads and caches {@link Plugin} instances from remote or local URLs.
 *
 * Plugins are fetched via dynamic `import()` (delegating to {@link PluginLoader}) and
 * cached in memory by URL so repeated calls for the same URL are served without
 * re-fetching.
 */
export default class UrlPluginSource {
    private readonly pluginsByUrl;
    private readonly cacheFolder;
    /**
     * @param cacheFolder Directory used to cache downloaded plugin bundles.
     *   Defaults to `~/.flowscripter/plugin`.
     */
    constructor(cacheFolder?: string);
    /**
     * Load the plugin at `url`, returning the cached instance on subsequent calls.
     *
     * @param url URL of the plugin bundle to load.
     * @returns The loaded {@link Plugin}, or `undefined` if the module exists but is
     *   not a valid plugin.
     * @throws If the module cannot be fetched or fails to load.
     */
    loadPlugin(url: URL): Promise<Plugin | undefined>;
}
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