function someName() {
  //fetch;
  //code;

  triggerIsTriggered = true;
}

function myFunc() {
  // leak
}
$: triggerIsTriggered && myFunc()

let foo = 1;
$: quux = baz/foo;
$: bar = foo++;
$: baz = bar+foo;

function someName() {
  //fetch;
  //code;

  myFunc()
}

function myFunc() {
  // no leak
}

let foo = 1;
let quux;
let bar;
let baz;

$$self.$$.update = () => {
     if ($$self.$$.dirty & /*foo*/ 1) {
         $: $$invalidate(2, bar = $$invalidate(0, foo++, foo));
      }

     if ($$self.$$.dirty & /*bar, foo*/ 5) {
          $: $$invalidate(1, baz = bar + foo);
      }

    if ($$self.$$.dirty & /*baz, foo*/ 3) {
        $: quux = baz / foo;
    }
 };