/**
 * Shared validation error for experiment config loading.
 *
 * Thrown by the loader's validation helpers and by matrix expansion. The
 * loader's entry point catches these and rewraps with the actual filename
 * prefix, so each loaded file gets accurate error messages without sharing
 * module state.
 */
export declare class ExperimentValidationError extends Error {
    constructor(message: string);
}
export declare function fail(msg: string): never;
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