import * as postcss from 'postcss';
import { ConfiguredVariable, ConfiguredVariableExpressionProps, ConfiguredVariableProps } from './configured-variable';
import { Node, NodeProps } from './node';
import type * as sassInternal from './sass-internal';
import { ForwardRule } from './statement/forward-rule';
import { UseRule } from './statement/use-rule';
/**
 * The set of raws supported by {@link Configuration}.
 *
 * @category Statement
 */
export interface ConfigurationRaws {
    /** Whether the final variable has a trailing comma. */
    comma?: boolean;
    /**
     * The whitespace between the final variable (or its trailing comma if it has
     * one) and the closing parenthesis.
     */
    after?: string;
}
/**
 * The initializer properties for {@link Configuration}.
 *
 * @category Statement
 */
export interface ConfigurationProps extends NodeProps {
    raws?: ConfigurationRaws;
    variables: Record<string, ConfiguredVariableExpressionProps> | Array<ConfiguredVariable | ConfiguredVariableProps>;
}
/**
 * A configuration map for a `@use` or `@forward` rule.
 *
 * @category Statement
 */
export declare class Configuration extends Node {
    readonly sassType: "configuration";
    raws: ConfigurationRaws;
    parent: ForwardRule | UseRule | undefined;
    /** The underlying map from variable names to their values. */
    private _variables;
    /** The number of variables in this configuration. */
    get size(): number;
    constructor(defaults?: ConfigurationProps);
    /** @hidden */
    constructor(_: undefined, inner: sassInternal.ConfiguredVariable[]);
    /**
     * Adds {@link variable} to this configuration.
     *
     * If there's already a variable with that name, it's removed first.
     */
    add(variable: ConfiguredVariable | ConfiguredVariableProps): this;
    /** Removes all variables from this configuration. */
    clear(): void;
    /**
     * Removes the variable named {@link name} from this configuration.
     *
     * Returns whether the variable was removed.
     */
    delete(key: string): boolean;
    /**
     * Returns the variable named {@link name} from this configuration if it
     * contains one.
     */
    get(key: string): ConfiguredVariable | undefined;
    /**
     * Returns whether this configuration has a variable named {@link name}.
     */
    has(key: string): boolean;
    /**
     * Sets the variable named {@link key}. This fully overrides the previous
     * value, so all previous raws and guarded state are discarded.
     */
    set(key: string, expression: ConfiguredVariableExpressionProps): this;
    /** Returns all the variables in this configuration. */
    variables(): IterableIterator<ConfiguredVariable>;
    clone(overrides?: Partial<ConfigurationProps>): Configuration;
    toJSON(): object;
    /** @hidden */
    toJSON(_: string, inputs: Map<postcss.Input, number>): object;
    /** @hidden */
    toString(): string;
    /** @hidden */
    get nonStatementChildren(): ReadonlyArray<ConfiguredVariable>;
}