import { Interval } from './eval';
import { ExprElement, ExprMap, MathMLMap, VarMap } from './elements';
export declare class ExprFunction extends ExprElement {
    readonly fn: string;
    readonly args: ExprElement[];
    constructor(fn: string, args?: ExprElement[]);
    evaluate(vars?: VarMap): number;
    interval(vars?: VarMap): Interval;
    substitute(vars?: ExprMap): ExprFunction;
    collapse(): ExprElement | ExprFunction;
    get simplified(): this;
    get variables(): string[];
    get functions(): string[];
    toString(): string;
    toMathML(custom?: MathMLMap): string;
    toVoice(custom?: MathMLMap): string;
}
export declare class ExprTerm extends ExprElement {
    readonly items: ExprElement[];
    constructor(items: ExprElement[]);
    evaluate(vars?: VarMap): number;
    interval(vars?: VarMap): Interval;
    substitute(vars?: ExprMap): ExprElement;
    get simplified(): ExprElement;
    get variables(): string[];
    get functions(): string[];
    toString(): string;
    toMathML(custom?: MathMLMap): string;
    toVoice(custom?: MathMLMap): string;
    collapse(): ExprElement;
}