Invert RGB color

index.ts

const invertColor = (hex: string) => [
  (x: string) => parseInt(x.substring(1), 16),
  (x: number) => 0xFFFFFF ^ x,
  (x: number) => `000000${x.toString(16)}`.slice(-6),
  (x: string) => `#${x}`,
].reduce((acc, f: (...args: any[]) => any) => f(acc), hex);