Function c

test/compose.spec.ts:16–16

(next: (x: string) => string)

      const a = (next: (x: string) => string) => (x: string) => next(x + 'a')
      const b = (next: (x: string) => string) => (x: string) => next(x + 'b')
      const c = (next: (x: string) => string) => (x: string) => next(x + 'c')
      const final = (x: string) => x

      expect(compose(a, b, c)(final)('')).toBe('abc')