var test = {
  /**
   * Before bracket init
   */
  ["a"]: "1",

  [( /*
      * Inside bracket init
      */
    "b"
  )]: "2",

  ["c"
  /*
   * After bracket key
   */]: "3",

  // Before bracket, line comment
  ["d"]: "4",

  [(
    // Inside bracket, line comment
    "e"
  )]: "5",

  ["f"
  // After bracket, line comment
  ]: "6"
};