text: // @module: es2020
  // @target: es2020
  // @filename: 0.ts
  export class B {
      print() {
          return "I am B";
      }
  }
  export function foo() {
      return "foo";
  }
  // @filename: 1.ts
  export function backup() {
      return "backup";
  }
  const specify = bar() ? "./0" : undefined;
  let myModule = import(specify);
  let myModule1 = import(undefined);
  let myModule2 = import(bar() ? "./1" : null);
  let myModule3 = import(null);
  