import * as t from "@babel/types";
import type { NodePath, PluginPass } from "@babel/core";
import type { Ctx } from "../context";
type State = PluginPass;
/**
 * Diagnostics. These never alter the output — they only emit code-frame
 * warnings to surface mistakes that would otherwise fail silently:
 *
 *  - a broken reactive chain: a signal assigned to a non-`$` variable;
 *  - a naming-contract violation: a `$`-prefixed declaration that cannot
 *    become a signal (`let $a;`), or a `function $foo(){}` that is neither a
 *    `$use*` hook nor an uppercase component.
 */
export declare const createDiagnosticsVisitor: (ctx: Ctx) => {
    VariableDeclarator?: undefined;
    AssignmentExpression?: undefined;
    FunctionDeclaration?: undefined;
} | {
    VariableDeclarator(path: NodePath<t.VariableDeclarator>, _state: State): void;
    AssignmentExpression(path: NodePath<t.AssignmentExpression>, _state: State): void;
    FunctionDeclaration(path: NodePath<t.FunctionDeclaration>, _state: State): void;
};
export {};