Function classes

src/internal/utilities.ts:22–28

(...classes: (string | false | undefined | null | { [className: string]: any })[])

 * Utility to join classes conditionally
 */
export function classes(...classes: (string | false | undefined | null | { [className: string]: any })[]): string {
  return classes
    .map(c => c && typeof c === 'object' ? Object.keys(c).map(key => !!c[key] && key) : [c])
    .reduce((flattened, c) => flattened.concat(c), [] as string[])
    .filter(c => !!c)
    .join(' ');
}

/**
 * Merges various styles into a single style object.