/**
 * Field allow-lists shared between the experiment loader and matrix expansion,
 * so the set of overridable `/defaults/*` and `/environment/*` fields stays a
 * single source of truth (otherwise matrix could accept or reject paths the
 * loader would later treat differently).
 */
export declare const ALLOWED_DEFAULTS_KEYS: Set<string>;
export declare const ALLOWED_ENVIRONMENT_KEYS: Set<string>;
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