/**
 * Provides an environment structure similar to R.
 * This allows the dataflow to hold current definition locations for variables, based on the current scope.
 *
 * @module
 */
import type { Identifier, IdentifierDefinition, IdentifierReference } from './identifier';
import type { DataflowGraph } from '../graph/graph';
import type { ControlDependency } from '../info';
/**
 * Marks the reference as maybe (i.e., as controlled by a set of {@link IdentifierReference#controlDependencies|control dependencies}).
 */
export declare function makeReferenceMaybe(ref: IdentifierReference, graph: DataflowGraph, environments: REnvironmentInformation, includeDefs: boolean, defaultCd?: ControlDependency | undefined): IdentifierReference;
export declare function makeAllMaybe(references: readonly IdentifierReference[] | undefined, graph: DataflowGraph, environments: REnvironmentInformation, includeDefs: boolean, defaultCd?: ControlDependency | undefined): IdentifierReference[];
export type EnvironmentMemory = Map<Identifier, IdentifierDefinition[]>;
/** A single entry/scope within an {@link REnvironmentInformation} */
export interface IEnvironment {
    /** Unique and internally generated identifier -- will not be used for comparison but helps with debugging for tracking identities */
    readonly id: number;
    /** Lexical parent of the environment, if any (can be manipulated by R code) */
    parent: IEnvironment;
    /** Maps to exactly one definition of an identifier if the source is known, otherwise to a list of all possible definitions */
    memory: EnvironmentMemory;
}
/** @see REnvironmentInformation */
export declare class Environment implements IEnvironment {
    readonly id: number;
    parent: IEnvironment;
    memory: Map<Identifier, IdentifierDefinition[]>;
    constructor(parent: IEnvironment);
}
/**
 * An environment describes a ({@link IEnvironment#parent|scoped}) mapping of names to their definitions ({@link EnvironmentMemory}).
 *
 * First, yes, R stores its environments differently, potentially even with another differentiation between
 * the `baseenv`, the `emptyenv`, and other default environments (see https://adv-r.hadley.nz/environments.html).
 * Yet, during the dataflow analysis, we want sometimes to know more (static {@link IdentifierDefinition|reference information})
 * and sometimes know less (to be honest, we do not want that,
 * but statically determining all attached environments is theoretically impossible --- consider attachments by user input).
 *
 * One important environment is the {@link BuiltInEnvironment} which contains the default definitions for R's built-in functions and constants.
 * Please use {@link initializeCleanEnvironments} to initialize the environments (which includes the built-ins).
 * During serialization, you may want to rely on the {@link builtInEnvJsonReplacer} to avoid the huge built-in environment.
 *
 *
 * @see {@link define} - to define a new {@link IdentifierDefinition|identifier definition} within an environment
 * @see {@link resolveByName} - to resolve an {@link Identifier|identifier/name} to its {@link IdentifierDefinition|definitions} within an environment
 * @see {@link makeReferenceMaybe} - to attach control dependencies to a reference
 * @see {@link pushLocalEnvironment} - to create a new local scope
 * @see {@link popLocalEnvironment} - to remove the current local scope
 * @see {@link appendEnvironment} - to append an environment to the current one
 * @see {@link overwriteEnvironment} - to overwrite the definitions in the current environment with those of another one
 */
export interface REnvironmentInformation {
    /**  The currently active environment (the stack is represented by the currently active {@link IEnvironment#parent}). Environments are maintained within the dataflow graph. */
    readonly current: IEnvironment;
    /** nesting level of the environment, will be `0` for the global/root environment */
    readonly level: number;
}
/**
 * The built-in {@link REnvironmentInformation|environment} is the root of all environments.
 *
 * For its default content (when not overwritten by a flowR config),
 * see the {@link DefaultBuiltinConfig}.
 */
export declare const BuiltInEnvironment: Environment;
/**
 * The twin of the {@link BuiltInEnvironment} but with less built ins defined for
 * cases in which we want some commonly overwritten variables to remain open.
 * If you do not know if you need the empty environment, you do not need the empty environment (right now).
 *
 * @see {@link BuiltInEnvironment}
 */
export declare const EmptyBuiltInEnvironment: IEnvironment;
/**
 * Initialize a new {@link REnvironmentInformation|environment} with the built-ins.
 * See {@link EmptyBuiltInEnvironment} for the case `fullBuiltIns = false`.
 */
export declare function initializeCleanEnvironments(fullBuiltIns?: boolean): REnvironmentInformation;
/**
 * Helps to serialize an environment, but replaces the built-in environment with a placeholder.
 */
export declare function builtInEnvJsonReplacer(k: unknown, v: unknown): unknown;