/**
 * Rust expression visitor — Expr IR → Rust source fragments.
 */
import { Expr, TypeRegistry } from "../../ir/expansion.js";
import { ExprVisitor } from "../../ir/visitor.js";
export declare class RustExprVisitor implements ExprVisitor {
    registry?: TypeRegistry;
    constructor(registry?: TypeRegistry);
    visitExpr(expr: Expr): string;
    private visitConstruct;
    /**
     * Handle Construct on a polymorphic type — the discriminator field becomes an enum variant.
     * E.g., Property { kind: "boolean", example: v } → Property { kind: PropertyKind::Custom { kind_name: "boolean".to_string() }, example: Some(v.into()), ..Default::default() }
     */
    private visitPolymorphicConstruct;
    private visitVariant;
    private visitArray;
    /**
     * Wrap field values appropriately for Rust — Option<T> fields need Some(),
     * string fields need .into(), etc.
     */
    private wrapFieldValue;
    private escapeString;
    private visitFieldRead;
}