import * as postcss from 'postcss';
import type { AtRuleRaws as PostcssAtRuleRaws } from 'postcss/lib/at-rule';
import { AnyExpression, ExpressionProps } from '../expression';
import type * as sassInternal from '../sass-internal';
import { Statement, StatementWithChildren } from '.';
import { _AtRule } from './at-rule-internal';
/**
 * The set of raws supported by {@link WarnRule}.
 *
 * @category Statement
 */
export type WarnRuleRaws = Pick<PostcssAtRuleRaws, 'afterName' | 'before' | 'between'>;
/**
 * The initializer properties for {@link WarnRule}.
 *
 * @category Statement
 */
export type WarnRuleProps = postcss.NodeProps & {
    raws?: WarnRuleRaws;
    warnExpression: AnyExpression | ExpressionProps;
};
/**
 * A `@warn` rule. Extends [`postcss.AtRule`].
 *
 * [`postcss.AtRule`]: https://postcss.org/api/#atrule
 *
 * @category Statement
 */
export declare class WarnRule extends _AtRule<Partial<WarnRuleProps>> implements Statement {
    readonly sassType: "warn-rule";
    parent: StatementWithChildren | undefined;
    raws: WarnRuleRaws;
    readonly nodes: undefined;
    get name(): string;
    set name(value: string);
    get params(): string;
    set params(value: string | number | undefined);
    /** The expression whose value is emitted when the warn rule is executed. */
    get warnExpression(): AnyExpression;
    set warnExpression(warnExpression: AnyExpression | ExpressionProps);
    private _warnExpression?;
    constructor(defaults: WarnRuleProps);
    /** @hidden */
    constructor(_: undefined, inner: sassInternal.WarnRule);
    clone(overrides?: Partial<WarnRuleProps>): this;
    toJSON(): object;
    /** @hidden */
    toJSON(_: string, inputs: Map<postcss.Input, number>): object;
    /** @hidden */
    toString(stringifier?: postcss.Stringifier | postcss.Syntax): string;
    /** @hidden */
    get nonStatementChildren(): ReadonlyArray<AnyExpression>;
}