tests/cases/conformance/es2021/logicalAssignment/logicalAssignment4.ts(39,13): error TS18048: 'defaultValue' is possibly 'undefined'.
tests/cases/conformance/es2021/logicalAssignment/logicalAssignment4.ts(45,13): error TS18048: 'defaultValue' is possibly 'undefined'.


==== tests/cases/conformance/es2021/logicalAssignment/logicalAssignment4.ts (2 errors) ====
    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;
                ~~~~~~~~~~~~
!!! error TS18048: 'defaultValue' is possibly 'undefined'.
            }
        }
        else {
            if (thing ??= defaultValue) {
                thing.name;
                defaultValue.name;
                ~~~~~~~~~~~~
!!! error TS18048: 'defaultValue' is possibly 'undefined'.
            }
        }
    }
    