Invert theme's colors in .attheme editor

.js

const variables = activeTheme.getVariables();

for (const variable of variables) {
  const color = activeTheme.getVariable(variable);
  
  color.red = 255 - color.red;
  color.green = 255 - color.green;
  color.blue = 255 - color.blue;
  
  activeTheme.setVariable(variable, color);
}