/**
 * Diagnostics helper — read-only health checks for integration debugging.
 *
 * @example
 *   import { getNativeDiagnostics } from '@nonoun/native-ui';
 *   const report = getNativeDiagnostics();
 *   console.log(report.missingDefinitions); // ['n-gripper']
 *   console.log(report.tokenBaseline);      // true
 */
export interface DiagnosticsReport {
    /** Tags that are expected but not yet defined via `customElements.get()`. */
    missingDefinitions: string[];
    /** Tags that ARE defined. */
    definedTags: string[];
    /** Whether the CSS token baseline appears loaded (checks for `--n-size` on `:root`). */
    tokenBaseline: boolean;
    /** Whether foundation CSS appears active (checks for `--n-color-accent-500` on `:root`). */
    foundationCss: boolean;
}
export interface DiagnosticsOptions {
    /** Additional tags to check beyond the core set. */
    extraTags?: string[];
}
/**
 * Returns a read-only diagnostics report. Side-effect free.
 */
export declare function getNativeDiagnostics(options?: DiagnosticsOptions): DiagnosticsReport;
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