const f = new File(['hello'], 'greeting.txt', { type: 'text/plain' })
f.name // β 'greeting.txt'File() creates a File object with content, a name, and an optional MIME type.
new File(fileParts, fileName, options) creates a File object. The second argument sets the name property.
Challenge: Verify that new File(['hello'], 'test.txt').name === 'test.txt'.