export declare type ArrayOrVarg<T> = T[] | [T[]];
export declare type MaybeArray<T> = T | T[];
export declare type Index<T> = Record<string, T>;
export declare type Thunk<T> = () => T;
/**
 * Use this to make assertion at end of if-else chain that all members of a
 * union have been accounted for.
 */
export declare function casesHandled(x: never): never;
declare type CustomDumper = (...args: any[]) => boolean;
declare global {
    function registerDumper(detector: CustomDumper): void;
}
/**
 * Quick and dirty logging. Not for production.
 */
export declare function dump(...args: any[]): void;
export declare function indexBy<T extends object>(items: T[], property: keyof T | ((item: T) => string)): Index<T>;
/**
 * Wrap a value in an array if it is not already an array.
 */
export declare function arrayify<T>(x: T): T extends Array<any> ? T : T[];
export declare function lookupOrThrow<T>(index: Index<T>, key: string): T;
export {};
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