undefined vs spread

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use spread
const isMobileView = true;
const test = () => {
  test: 1,
  test2: 2,
  ...(isMobileView && { ml: '-6px' }),
}
test();
ready
use undefined
const isMobileView = true;
const test = () => {
  test: 1,
  test2: 2,
  ml: isMobileView ? '-6px' : undefined,
}
test();
ready

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