Object is possibly 'undefined' issue

[spielcrypto]

I'm doing a extreme check to not get object undefined but typescript throw the error Object is possibly 'undefined' anyway

TypeScript Version: 2.7.2

Search Terms:

Code

if (state && state.people && state.people.length) {
                state.people = state.people.sort((person1: IPerson, person2: IPerson) => {
                    const orderBy = state.orderBy;
                    if ( orderBy
                        && person1
                        && person2
                        && Object.keys(person1).length
                        && Object.keys(person2).length
                        && person1[orderBy]
                        && person2[orderBy]) {
                        if (person1[orderBy] < person2[orderBy]) {
                            return (state.sort) ? -1 : 1;
                        }
                        if (person1[orderBy] > person2[orderBy]) {
                            return (state.sort) ? 1 : -1;
                        }
                    }
                    return 0;
                });
}

Expected behavior:
it shouldn't throw the error Object is possibly 'undefined'
Actual behavior:
It throws the error Object is possibly 'undefined' in these if

• if (person1[orderBy] > person2[orderBy])
• if (person1[orderBy] < person2[orderBy])

Playground Link:

Related Issues:

[RyanCavanaugh]

Duplicate #11483

[spielcrypto]

Ok I found the solution:
this works

const compare = (person1: IPerson, person2: IPerson) => {
            const a = person1[state.orderBy];
            const b = person2[state.orderBy];

            if ( a && b) {
                if (a < b) {
                    return (state.sort) ? -1 : 1;
                }
                if (a > b) {
                    return (state.sort) ? 1 : -1;
                }
            }

            return 0;
};

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.