Какво не съм настроил по IDE-то, че тоя код:

function threeIntegerSum(arr) {
    let nums = arr[0].split(' ').map(Number);

    console.log(
        check(nums[0], nums[1], nums[2]) ||
        check(nums[0], nums[2], nums[1]) ||
        check(nums[2], nums[1], nums[0]) ||
        "No"
    );

    function check(num1, num2, num3) {
        if (num1 > num2) {
            [num1, num2] = [num2, num1]
        }
        if (num1 + num2 == num3) {
            return `${num1} + ${num2} = ${num3}`
        }
    }
}

гърми с:

e:\Programs\Pure JS\Exes\03L.js:15
            [num1, num2] = [num2, num1]
            ^

ReferenceError: Invalid left-hand side in assignment
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)
    at node.js:968:3

Node.js - инсталиран
ЕCMAScript 6 - настроен