react/jsx-props-no-spread-multi

Spreading the same object a second time adds nothing new, and it overwrites every prop written between the two. In <Button {...props} disabled {...props} />, disabled is lost if props also has a disabled. It's almost always a leftover from a merge or a copy.

--fix removes every spread of the variable except the last. With an ESLint config there's no fix, same as in eslint-plugin-react.

Configure

Off by default. To turn it on:

[lint.rules]
"react/jsx-props-no-spread-multi" = "error" # or "warn"

Examples

Reported:

function SaveButton(props) {
  return <Button {...props} type="submit" {...props} />;
}

Not reported:

function SaveButton(props) {
  return <Button {...props} type="submit" />;
}

function Field({ input, meta }) {
  return <Input {...input} {...meta} />;
}