/**
 * Expression visitor interface and shared helpers.
 *
 * The ExprVisitor interface is the contract between the shared IR and
 * per-language code emitters. Each language implements its own visitor
 * in `languages/<lang>/visitor.ts`.
 */
import { Expr, Construct, VariantConstruct, TypeRegistry } from "./expansion.js";
export interface ExprVisitor {
    visitExpr(expr: Expr): string;
    /** Optional type registry for wire format generation and type-aware codegen. */
    registry?: TypeRegistry;
}
/**
 * Render a Construct expression's fields as a plain object literal.
 * Used by TypeScript, Python, C#, Go coercions where the template wraps
 * the literal in language-specific loading logic (e.g., `TypeName.load({...}, ctx)`).
 *
 * @param expr - A Construct or VariantConstruct expression
 * @param visitor - The language-specific visitor for rendering field values
 * @param format - How to format the fields:
 *   - "js": `{ field: value }` (TypeScript, Go)
 *   - "py": `{"field": value}` (Python)
 */
export declare function renderObjectLiteral(expr: Construct | VariantConstruct, visitor: ExprVisitor, format?: "js" | "py"): string;
/** camelCase → PascalCase (first char uppercase). */
export declare function toPascalCase(name: string): string;
/** Exhaustive check helper — TypeScript enforces all Expr.kind arms are handled. */
export declare function assertNever(x: never): never;