Sometimes semi-colons are indeed necessary in Javascript

semi-colons.js

function echo (str) {
  return str
}

echo("Hello")

(function() {
  echo("Goodbye")
})

// => "TypeError: string is not a function"

function echo (str) {
  return str
}

echo("Hello");

(function() {
  echo("Goodbye")
})

// => "You may proceed"