export interface InstallExtensionsOptions {
    /** Path to air.json. Uses AIR_CONFIG env or ~/.air/air.json if not set. */
    config?: string;
    /** npm install prefix (--prefix). Defaults to the directory containing air.json. */
    prefix?: string;
}
export interface InstallExtensionsResult {
    /** Extensions that were already installed. */
    alreadyInstalled: string[];
    /** Extensions that were installed by this call. */
    installed: string[];
    /** Extensions that were skipped (local paths, not npm packages). */
    skipped: string[];
}
/**
 * Install missing extensions declared in air.json.
 *
 * Reads the `extensions` array from air.json, checks which npm packages
 * are already present in node_modules, and installs any missing ones
 * using `npm install` with the specified prefix.
 *
 * Local path extensions (starting with ./, ../, or /) are skipped since
 * they don't need npm installation.
 *
 * @throws Error if air.json is not found, or if npm install fails.
 */
export declare function installExtensions(options?: InstallExtensionsOptions): Promise<InstallExtensionsResult>;
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