import { Pattern, RecursiveDescentParser, Span, Token } from "./recursive-descent-parser";
export interface AcceptFn<T> {
    (parser: RecursiveDescentParser): T | undefined;
}
export declare function many<T>(parser: RecursiveDescentParser, acceptFn: AcceptFn<T>): T[];
export declare function flipFlop<T, U>(parser: RecursiveDescentParser, flipFn: AcceptFn<T>, flopFn: AcceptFn<U>, skipWsFn?: AcceptFn<void>): (T | U)[];
export declare function choice<T>(acceptFns: AcceptFn<T>[]): AcceptFn<T>;
export declare function mergeSpans(spans: (undefined | Span | (undefined | Span)[])[]): Span;
export declare function acceptSpecialToken<TType extends string>(parser: RecursiveDescentParser, type: TType, pattern?: Pattern): (Token & {
    type: TType;
}) | undefined;
export declare function expectSpecialToken<TType extends string>(parser: RecursiveDescentParser, type: TType, pattern?: Pattern): Token & {
    type: TType;
};
export declare function acceptPatternAndThen<T>(pattern: Pattern, then: (token: Token) => T): AcceptFn<T>;