[Feature]: Make Decimal Rounding Configurable

[onurorhon]

What feature would you like?

Currently, the number of decimal places in checkAndEvaluateMath.ts is fixed to 3. We want to make this number configurable by introducing a platform option called mathRoundDecimals (or a similar name). This will allow users to define the number of decimal places according to their requirements.

Acceptance Criteria:

• Introduce a new platform option called mathRoundDecimals (or similar).
• Use this option to determine the number of decimal places.
• Ensure a default value is used if mathRoundDecimals is not provided.

Here is the relevant code snippet:

// the outer Number() gets rid of insignificant trailing zeros of decimal numbers
const reducedTo3Fixed = Number(Number.parseFloat(`${result}`).toFixed(3));
result = resultUnit ? `${reducedTo3Fixed}${resultUnit}` : reducedTo3Fixed;
return result;

Related TS plugin ticket: https://github.com/tokens-studio/figma-plugin/issues/2874

@jorenbroekema

Would you be available to contribute this feature?

• [ ] Yes, I would like to contribute this

[jorenbroekema]

Suggested API seems good to me, goal is to configure like so:

{
  platforms: {
    css: {
      mathRoundDecimals: 4,
      // rest of the options
    }
  }
}

and the check evaluate math transform can pick up on that platform option, I'm also okay additionally to set the default value to 4 instead of 3 because em/rem and the rounding to 4 could be significant for pixels, where 5th usually isn't.