import * as postcss from 'postcss';
import type { AtRuleRaws } from 'postcss/lib/at-rule';
import { ParameterList, ParameterListProps } from '../parameter-list';
import { RawWithValue } from '../raw-with-value';
import * as sassInternal from '../sass-internal';
import { ChildNode, ContainerProps, NewNode, Statement, StatementWithChildren } from '.';
import { _AtRule } from './at-rule-internal';
/**
 * The set of raws supported by {@link FunctionRule}.
 *
 * @category Statement
 */
export interface FunctionRuleRaws extends Omit<AtRuleRaws, 'params'> {
    /**
     * The function's name.
     *
     * This may be different than {@link FunctionRule.functionName} if the name
     * contains escape codes or underscores.
     */
    functionName?: RawWithValue<string>;
}
/**
 * The initializer properties for {@link FunctionRule}.
 *
 * @category Statement
 */
export type FunctionRuleProps = ContainerProps & {
    raws?: FunctionRuleRaws;
    functionName: string;
    parameters?: ParameterList | ParameterListProps;
};
/**
 * A `@function` rule. Extends [`postcss.AtRule`].
 *
 * [`postcss.AtRule`]: https://postcss.org/api/#atrule
 *
 * @category Statement
 */
export declare class FunctionRule extends _AtRule<Partial<FunctionRuleProps>> implements Statement {
    readonly sassType: "function-rule";
    parent: StatementWithChildren | undefined;
    raws: FunctionRuleRaws;
    nodes: ChildNode[];
    /**
     * The name of the function.
     *
     * This is the parsed and normalized value, with underscores converted to
     * hyphens and escapes resolved to the characters they represent.
     */
    functionName: string;
    /** The parameters that this function takes. */
    get parameters(): ParameterList;
    set parameters(parameters: ParameterList | ParameterListProps);
    private _parameters;
    get name(): string;
    set name(value: string);
    get params(): string;
    set params(value: string | number | undefined);
    constructor(defaults: FunctionRuleProps);
    /** @hidden */
    constructor(_: undefined, inner: sassInternal.FunctionRule);
    clone(overrides?: Partial<FunctionRuleProps>): this;
    toJSON(): object;
    /** @hidden */
    toJSON(_: string, inputs: Map<postcss.Input, number>): object;
    /** @hidden */
    toString(stringifier?: postcss.Stringifier | postcss.Syntax): string;
    /** @hidden */
    get nonStatementChildren(): ReadonlyArray<ParameterList>;
    /** @hidden */
    normalize(node: NewNode, sample?: postcss.Node): ChildNode[];
}