export declare function failIfValidOrNonExhaustive(_variable: never, message: string): never;
export declare const millisecondsPerSeconds = 1000;
import { ColorQuadruplet } from './webglUtils';
export declare const strokeColor: ColorQuadruplet;
export declare const halfStrokeWidth = 0.5;
export declare const measuredCharacterWidth = 12.3;
export declare const measuredCharacterHeight = 18;
export declare const referenceFontSize = 16;
export declare const ellipsisCharacter: string;
export declare const groupByMap: <Key, Value>(collection: Value[], iteratee: (value: Value) => Key) => Map<Key, Value[]>;