import type { Comment, ReturnStatement, SourceLocation } from 'estree';
import type { StepperExpression, StepperPattern } from '..';
import type { StepperBaseNode } from '../../interface';
export declare class StepperReturnStatement implements ReturnStatement, StepperBaseNode {
    type: 'ReturnStatement';
    argument: StepperExpression | null;
    leadingComments?: Comment[] | undefined;
    trailingComments?: Comment[] | undefined;
    loc?: SourceLocation | null | undefined;
    range?: [number, number] | undefined;
    constructor(argument: StepperExpression | null, leadingComments?: Comment[] | undefined, trailingComments?: Comment[] | undefined, loc?: SourceLocation | null | undefined, range?: [number, number] | undefined);
    static create(node: ReturnStatement): StepperReturnStatement;
    isContractible(): boolean;
    isOneStepPossible(): boolean;
    contract(): StepperExpression;
    contractEmpty(): void;
    oneStep(): StepperExpression;
    substitute(id: StepperPattern, value: StepperExpression): StepperBaseNode;
    freeNames(): string[];
    allNames(): string[];
    rename(before: string, after: string): StepperReturnStatement;
}