/**
 * Structured error reporting for the .gg pipeline.
 *
 * Every error carries the originating source location (file + 1-based
 * line) and the source kind ('dsl' | 'json' | 'check') so messages can
 * cite the exact spot where the user wrote the offending construct.
 */
export type GgErrorSource = 'dsl' | 'json' | 'check' | 'icon';
export interface GgError {
    message: string;
    line: number;
    source: GgErrorSource;
    /** The original line text (for `at file:line  (snippet)` rendering) */
    snippet?: string;
    /** Optional second location for cross-cutting issues (e.g. duplicate IDs) */
    related?: {
        line: number;
        source: GgErrorSource;
        snippet?: string;
    };
}
export declare function formatError(err: GgError, filename?: string): string;
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