import { GenericParameter } from './GenericParameter';
import { Parameter } from './Parameter';
import { TypeBuilder } from './TypeBuilder';
import { Writer } from './Writer';
export declare class FunctionType extends TypeBuilder {
    needsParenthesisWhenIndexed: boolean;
    needsParenthesisInKeyof: boolean;
    needsParenthesisInUnion: boolean;
    needsParenthesisInIntersection: boolean;
    private returnType;
    private parameters;
    private genericParameters;
    setReturnType(returnType: TypeBuilder): this;
    addParameter(param: Parameter): this;
    addGenericParameter(param: GenericParameter): this;
    write(writer: Writer): void;
}
export declare function functionType(): FunctionType;