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Unexpected "Object is possibly undefined" error #17240

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@chrisprice

Description

@chrisprice

TypeScript Version: 2.3.4

Code

const foo = (bar?: { baz: number }) => {
    if (bar == null) {
        bar = { baz: 0 };
    }
    const baz = () => {
        console.log(bar.baz); // Object is possibly undefined
    };
    baz();
};

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Expected behavior:
No error

Actual behavior:
Error "Object is possibly undefined"

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