TypeScript/tests/cases/conformance/es2021/logicalAssignment/logicalAssignment4.ts

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

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

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

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

function foo4(results: number[] | undefined) {
    results ??= [];
    results.push(100);
}

interface ThingWithOriginal {
    name: string;
    original?: ThingWithOriginal
}
declare const v: number
function doSomethingWithAlias(thing: ThingWithOriginal | undefined, defaultValue: ThingWithOriginal | undefined) {
    if (v === 1) {
        if (thing &&= thing.original) {
            thing.name;
        }
    }
    else if (v === 2) {
        if (thing &&= defaultValue) {
            thing.name;
            defaultValue.name
        }
    }
    else if (v === 3) {
        if (thing ||= defaultValue) {
            thing.name;
            defaultValue.name;
        }
    }
    else {
        if (thing ??= defaultValue) {
            thing.name;
            defaultValue.name;
        }
    }
}