import type { Leaf, Location, NoInfo } from '../model';
import { RNode } from '../model';
import { RType } from '../type';
import { RNa, RNull } from '../../../convert-values';
import type { Identifier } from '../../../../../dataflow/environments/identifier';
/**
 * Represents identifiers (variables) such as `x` in `x <- 42` or `a::foo` in `a::foo()`.
 * See {@link Identifier} for more information about how identifiers are represented.
 * @typeParam Info - can be used to store additional information about the node
 * @typeParam T    - the type used to represent the identifier, by default {@link Identifier}
 */
export interface RSymbol<Info = NoInfo, T extends Identifier = Identifier> extends Leaf<Info>, Location {
    readonly type: RType.Symbol;
    content: T;
}
/**
 * Helper for working with {@link RSymbol} AST nodes.
 */
export declare const RSymbol: {
    readonly name: "RSymbol";
    /**
     * Type guard for {@link RSymbol} nodes.
     * @see {@link RSymbol.isSpecial} - to check whether a symbol is a special symbol like `NA` or `NULL`
     */
    readonly is: <OtherInfo = object>(this: void, node: RNode<OtherInfo> | undefined) => node is RSymbol<OtherInfo>;
    /**
     * Type guard for special symbols, i.e. `NA` and `NULL`.
     * @see {@link RNa} - for the value of `NA`
     * @see {@link RNull} - for the value of `NULL`
     * @see {@link RSymbol.is} - to check whether a node is a symbol at all
     */
    readonly isSpecial: <OtherInfo = object>(this: void, node: RNode<OtherInfo> | undefined) => node is RSymbol<OtherInfo, typeof RNull | typeof RNa>;
    readonly getLocation: (this: void, node: RNode) => import("../../../../../util/range").SourceLocation | undefined;
    readonly getId: (this: void, node: RNode<import("../processing/decorate").ParentInformation>) => import("../processing/node-id").NodeId;
    readonly getType: (this: void, node: RNode) => RType;
    readonly visitAst: <OtherInfo = object>(this: void, nodes: import("../model").SingleOrArrayOrNothing<RNode<OtherInfo>>, onVisit?: import("../processing/visitor").OnEnter<OtherInfo>, onExit?: import("../processing/visitor").OnExit<OtherInfo>) => void;
    readonly collectAllIds: <OtherInfo>(this: void, nodes: import("../model").SingleOrArrayOrNothing<RNode<OtherInfo & import("../processing/decorate").ParentInformation>>) => Set<import("../processing/node-id").NodeId>;
    readonly directChildren: <OtherInfo>(this: void, node: RNode<OtherInfo>) => readonly (RNode<OtherInfo> | typeof import("./r-function-call").EmptyArgument)[];
    readonly directParent: <OtherInfo>(this: void, node: RNode<OtherInfo & import("../processing/decorate").ParentInformation>, idMap: import("../processing/decorate").AstIdMap<OtherInfo & import("../processing/decorate").ParentInformation>) => RNode<OtherInfo & import("../processing/decorate").ParentInformation> | undefined;
    readonly iterateParents: <OtherInfo>(this: void, node: RNode<OtherInfo & import("../processing/decorate").ParentInformation> | undefined, idMap: import("../processing/decorate").AstIdMap<OtherInfo & import("../processing/decorate").ParentInformation>) => Generator<RNode<OtherInfo & import("../processing/decorate").ParentInformation>>;
    readonly depth: (this: void, node: RNode<import("../processing/decorate").ParentInformation>, idMap: import("../processing/decorate").AstIdMap<import("../processing/decorate").ParentInformation>) => number;
    readonly collectAllIdsWithStop: <OtherInfo>(this: void, nodes: import("../model").SingleOrArrayOrNothing<RNode<OtherInfo & import("../processing/decorate").ParentInformation>>, stop: (node: RNode<OtherInfo & import("../processing/decorate").ParentInformation>) => boolean) => Set<import("../processing/node-id").NodeId>;
    readonly lexeme: <R extends RNode<import("../processing/decorate").ParentInformation>>(this: void, node: R | undefined) => R extends {
        lexeme: string;
    } ? string : string | undefined;
    readonly documentation: typeof import("../../../../roxygen2/documentation-provider").getDocumentationOf;
};