/TypeScript/Implement a groupByOwners function that: Accepts an associative array

Implement a groupByOwners function that: Accepts an associative array

function groupByOwners(array $files) : array
{
    $result = [];

    foreach($files as $file => $owner) {
        $result[$owner][] = $file;
    }

    return $result;
}

Source: gist.github.com

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