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Object is possibly 'undefined' issue #22767

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@spielcrypto

Description

@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])

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