// @strict: true
// @target: esnext, es2021, es2020, es2015

function foo1(results: number[] | undefined, results1: number[] | undefined) {
    (results ||= results1 ||= []).push(100);
}

function foo2(results: number[] | undefined, results1: number[] | undefined) {
    (results ??= results1 ??= []).push(100);
}

function foo3(results: number[] | undefined, results1: number[] | undefined) {
    (results &&= results1 &&= []).push(100);
}