Improving CSS performance in React Styled Components

Which method is more efficient and why?

I have heard that the css method in Styled-components can be resource-intensive. I am curious to know if using multiple nested ${(prop) => {}} functions is more costly compared to a single function with the css method embedded inside.

Option 1

const Foo = styled.div`
  border-radius: 50%;
  display: flex;
  width: ${(props) => props.size};
  height: ${(props) => props.size};
  color: ${(props) => props.bgColor};
  background-color: ${(props) => props.bgColor};
`;

vs

Option 2

const Bar = styled.div`
  border-radius: 50%;
  display: flex;
  ${(props) => {
    return css`
      width: ${props.size};
      height: ${props.size};
      color: ${props.bgColor};
      background-color: ${props.bgColor};
    `;
  }}
`;

Answer №1

When it comes to performance, the difference should be minimal. Styled Components only provide optimization when dealing with static styles that have no interpolations.

It's important to note that styled.div and other Styled CSS methods essentially do the same thing as css. These methods also allow for functions as arguments instead of interpolated strings. To take it a step further, you can write code like this:

const Baz = styled.div((props) => css`
  border-radius: 50%;
  display: flex;
  width: ${props.size};
  height: ${props.size};
  color: ${props.bgColor};
  background-color: ${props.bgColor};
`);

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