import * as _Object from './ion/Object';
import * as Type from './Type';
import * as RuntimeType from './RuntimeType';
import * as Expression from './Expression';
import * as Typed from './Typed';
import * as Node from './Node';
import * as Location from './Location';
import * as Null from './ion/Null';
import * as _Array from './ion/Array';
import * as SpreadElement from './SpreadElement';
import * as Boolean from './ion/Boolean';
export declare class FunctionType implements _Object.Object, Type.Type, RuntimeType.RuntimeType, Expression.Expression, Typed.Typed, Node.Node {
    readonly location: Location.Location | Null.Null;
    readonly type: Type.Type | Null.Null;
    readonly params: _Array.Array<Type.Type | SpreadElement.SpreadElement>;
    readonly async: Boolean.Boolean;
    readonly returnType: Type.Type | Null.Null;
    static readonly id = "FunctionType";
    static readonly implements: Set<string>;
    constructor({ location, type, params, async: _async, returnType }: {
        location?: Location.Location | Null.Null;
        type?: Type.Type | Null.Null;
        params: _Array.Array<Type.Type | SpreadElement.SpreadElement>;
        async?: Boolean.Boolean;
        returnType?: Type.Type | Null.Null;
    });
    patch(properties: {
        location?: Location.Location | Null.Null;
        type?: Type.Type | Null.Null;
        params?: _Array.Array<Type.Type | SpreadElement.SpreadElement>;
        async?: Boolean.Boolean;
        returnType?: Type.Type | Null.Null;
    }): FunctionType;
    static is(value: any): value is FunctionType;
}
export declare function isFunctionType(value: any): value is FunctionType;
export default FunctionType;
