export type ConfigTarget = "global" | "local" | "project";
export interface ConfigLayer {
    target: ConfigTarget | "env";
    /** Human label for menus and --list-groups provenance. */
    label: string;
    file: string;
}
/** The file a write target maps to. */
export declare function targetFile(projectDir: string, target: ConfigTarget): string;
/** All read layers in precedence order (low -> high), including the env overlay. */
export declare function readLayers(projectDir: string): ConfigLayer[];
/** The `groups` map a single layer file declares for one plugin slug, or {}. */
export declare function readLayerGroups(file: string, slug: string): Record<string, boolean>;
/** Effective group state and the layer label that last set each group. */
export declare function readEffectiveGroups(projectDir: string, slug: string): {
    state: Record<string, boolean>;
    source: Record<string, string>;
};
/**
 * Update the `groups` map for one plugin slug in a single layer file, applying
 * `mutate` to whatever that layer already declares (empty {} if none). Preserves
 * every other key in the file; the doc is re-dumped, so YAML comments in a
 * hand-edited file are not preserved (call sites note this for the tracked
 * project layer).
 */
export declare function writeLayerGroups(file: string, slug: string, mutate: (existing: Record<string, boolean>) => Record<string, boolean>): void;