export declare function assertUnreachable(value: never): never;
export declare function partition<T>(xs: T[], fn: (x: T) => boolean): [T[], T[]];
export declare type TokenPosition = {
    index: number;
    outerIndex: number;
    length: number;
};
export declare function showInContext(strs: readonly string[], pos: TokenPosition): string;
export declare class ParseError extends Error {
    constructor(message: string, strs: readonly string[], pos: TokenPosition);
}
export declare class CompileError extends Error {
}