import type { ScaffoldError, ScaffoldWarning } from '../types/index.js';
/**
 * Validate .scaffold/state.json for the given project root.
 *
 * - Returns STATE_MISSING error if file does not exist
 * - Returns STATE_PARSE_ERROR if file is not valid JSON
 * - Returns STATE_SCHEMA_VERSION error if schema-version is not 1, 2, 3, or 4
 * - Returns FIELD_INVALID_VALUE errors for steps with invalid status values
 * - Returns STATE_IN_PROGRESS warning if in_progress is non-null (potential crash)
 *
 * @param projectRoot - project root directory
 * @param statePath - optional override for the state.json path (defaults to .scaffold/state.json)
 */
export declare function validateState(projectRoot: string, statePath?: string): {
    errors: ScaffoldError[];
    warnings: ScaffoldWarning[];
};
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