/**
 * Rx expression evaluator — parse and evaluate {{ expr }} at runtime.
 *
 * Handles:
 * - State references: {{ count }}, {{ user.name }}
 * - Arithmetic: {{ count + 1 }}, {{ price * quantity }}
 * - Comparisons: {{ count > 0 }}, {{ status === 'active' }}
 * - Ternary: {{ active ? 'Yes' : 'No' }}
 * - Logical: {{ a && b }}, {{ !loading }}
 * - Pipe filters: {{ price | currency:'USD' }}, {{ name | upper }}
 * - Built-in vars: $item, $index, $event, $error, $result, $state
 */
import type { Store } from './state.js';
/** Scope for expression evaluation (loop variables, event data, etc.) */
export interface EvalScope {
    $item?: unknown;
    $index?: number;
    $event?: unknown;
    $error?: unknown;
    $result?: unknown;
    [key: string]: unknown;
}
/**
 * Check if a string contains {{ }} expressions.
 */
export declare function isRxExpression(value: unknown): value is string;
/**
 * Evaluate a string that may contain {{ expr }} templates.
 * If the entire string is a single {{ expr }}, returns the raw value (not stringified).
 * If mixed with text, interpolates as string.
 */
export declare function evaluateTemplate(template: string, store: Store, scope?: EvalScope): unknown;
/**
 * Evaluate a raw expression string (without {{ }}).
 */
export declare function evaluateExpression(expr: string, store: Store, scope?: EvalScope): unknown;
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