config.json

{
  "source": [
    "tmp/**/*.json"
  ],
  "platforms": {
    "scss": {
      "transformGroup": "scss",
      "buildPath": "MyStyleDictionary/scss/",
      "files": [{
        "destination": "_variables.scss",
        "format": "scss/variables"
      }]
    },
    "web": {
      "transformGroup": "web",
      "buildPath": "MyStyleDictionary/web/",
      "files": [{
        "destination": "_variables.css",
        "format": "css/variables"
      }]
    },
    "css": {
      "transformGroup": "css",
      "buildPath": "MyStyleDictionary/css/",
      "files": [{
        "destination": "_variables.css",
        "format": "css/variables"
      }]
    },
    "android": {
      "transformGroup": "android",
      "buildPath": "MyStyleDictionary/android/",
      "files": [{
        "destination": "font_dimens.xml",
        "format": "android/fontDimens"
      },{
        "destination": "colors.xml",
        "format": "android/colors"
      }]
    },
    "ios": {
      "transformGroup": "ios",
      "buildPath": "MyStyleDictionary/ios/",
      "files": [
        {
          "destination": "StyleDictionaryColor.h",
          "format": "ios/colors.h",
          "className": "StyleDictionaryColor",
          "type": "StyleDictionaryColorName",
          "filter": {
            "attributes": {
              "category": "color"              
            }
          }
        },
        {
          "destination": "StyleDictionaryColor.m",
          "format": "ios/colors.m",
          "className": "StyleDictionaryColor",
          "type": "StyleDictionaryColorName",
          "filter": {
            "attributes": {
              "category": "color"
            }
          }
        },
        {
          "destination": "StyleDictionarySize.h",
          "format": "ios/static.h",
          "className": "StyleDictionarySize",
          "type": "float",
          "filter": {
            "attributes": {
              "category": "size"
            }
          }
        },
        {
          "destination": "StyleDictionarySize.m",
          "format": "ios/static.m",
          "className": "StyleDictionarySize",
          "type": "float",
          "filter": {
            "attributes": {
              "category": "size"
            }
          }
        }
      ]
    },
    "flutter": {
      "transformGroup": "flutter",
      "buildPath": "MyStyleDictionary/flutter/unique_file/",
      "files": [
          {
              "destination": "style_dictionary.dart",
              "format": "flutter/class.dart",
              "className": "StyleDictionary"
          }
      ]
  },
  "flutter-separate": {
      "transformGroup": "flutter-separate",
      "buildPath": "MyStyleDictionary/flutter/",
      "files": [
          {
              "destination": "style_dictionary_color.dart",
              "format": "flutter/class.dart",
              "className": "StyleDictionaryColor",
              "type": "color",
              "filter": {
                  "attributes": {
                      "category": "color"
                  }
              }
          },
          {
              "destination": "style_dictionary_sizes.dart",
              "format": "flutter/class.dart",
              "className": "StyleDictionarySize",
              "type": "float",
              "filter": {
                  "attributes": {
                      "category": "size"
                  }
              }
          }
      ]
  }
   }
  
}