// `@filename` splits a snippet into a virtual multi-file project.
// @filename: math.ts
export function 
function sum(a: number, b: number): numbersum(
(parameter) a: numbera: number, 
(parameter) b: numberb: number): number {
  return 
(parameter) a: numbera + 
(parameter) b: numberb
}

// @filename: index.ts
import { 
(alias) function sum(a: number, b: number): number
import sumsum } from "./math"
const result = 
(alias) sum(a: number, b: number): number
import sumsum(1, 2)
const result: number