f1 = (
  //comment
  a = b,
) => {};

f2 = (
  a = b, //comment
) => {};

f3 = (
  a = b, //comment
) => {};

f4 = // Comment
  () => {};

f5 =
  // Comment

  () => {};

f6 =
  /* comment */

  // Comment

  () => {};

let f1 = (
  //comment
  a = b,
) => {};

let f2 = (
  a = b, //comment
) => {};

let f3 = (
  a = b, //comment
) => {};

let f4 = // Comment
  () => {};

let f5 =
  // Comment

  () => {};

let f6 =
  /* comment */

  // Comment

  () => {};