[FEATURE REQUEST] Support sets of token JSON files

[freemansoft]

:speech_balloon: Support a directory of JSON files

It looks like the program supports a single JSON input file. The design tokens are designed to support core and context tokens in different files

:question: Link to specification or documentation (if available)

(Design Tokens - Material Deisgn)[https://m3.material.io/foundations/design-tokens/how-to-read-tokens] refers to a hierarchy of tokens. Typically these are in separate files.

• System Token,
• Reference Token,
• Default Value

I've done this in the past by merging the token files into a single dictionary in the order specified by the metadata files.

[freemansoft]

Looking at example/bin/example-themes.json the top-level sections in that file are sections that can be their own file when you have a multi-file design token file set. The $themes and $metadata sections don't include pathing info because everything is in the same location single file

Sections

• core
• light
• dark
• theme
• $themes
• $metadata

In a single json file. Every ref is basically to a top level item.

"$themes": [
    {
      "id": "33f7ab9c99363ec90d03707ec9b383c1259aadbe",
      "name": "light",
      "selectedTokenSets": {
        "core": "source",
        "light": "enabled",
        "theme": "enabled"
      },
      "$figmaStyleReferences": {}
    },

In a multi-file json definition, the references in $themes and $metadata must include pathing information

[
  {
    "id": "7347fd90e502aaece9e7cf40f79f188b93485a2a",
    "name": "default - light",
    "selectedTokenSets": {
      "global": "enabled",
      "theme/light": "enabled",
      "theme/dark": "disabled"

I can do a PR to support separate sections (light, dart, etc) if you give me an idea of how you want this to look.

1. The code could convert the individual files into a single map by loading them in the order in $metadata. The $metadata section can be modified to remove the pathing. The $themes section could be modified to remove the pathing
2. Other?

[freemansoft]

Candidate is PR https://github.com/mark-nicepants/figma2flutter/pull/4