chore: add SD demo implementing the spec

docs/src/components/sd-demo/resolver.json

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+{
+  "name": "Demo resolver",
+  "description": "This demonstrates the resolver spec",
+  "sets": [
+    {
+      "name": "core",
+      "values": ["core.json"]
+    },
+    {
+      "name": "modes",
+      "values": ["light.json", "dark.json"]
+    }
+  ],
+  "modifiers": [
+    {
+      "name": "mode",
+      "values": [
+        {
+          "name": "light",
+          "values": ["core", "light.json"]
+        },
+        {
+          "name": "dark",
+          "values": ["core", "dark.json"]
+        }
+      ]
+    }
+  ]
+}

docs/src/components/sd-demo/sd-demo.ts

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+import StyleDictionary from 'style-dictionary';
+import { fs } from 'style-dictionary/fs';
+import type { TransformedToken } from 'style-dictionary/types';
+import { permutateThemes } from '@tokens-studio/sd-transforms';
+import type { ThemeObject } from '@tokens-studio/types';
+import { LitElement, css, html } from 'lit';
+import { unsafeHTML } from 'lit/directives/unsafe-html.js';
+import { init } from '../../monaco/monaco.js';
+import core from './tokens/core.json';
+import light from './tokens/light.json';
+import dark from './tokens/dark.json';
+import resolver from './resolver.json';
+
+const files = {
+  core,
+  light,
+  dark,
+  resolver,
+};
+
+async function mirrorTokenFiles() {
+  await fs.promises.mkdir('tokens');
+  const write = async (path: string, content: object) => {
+    return fs.promises.writeFile(path, JSON.stringify(content, null, 2));
+  };
+  await Promise.all(
+    (
+      [
+        ['tokens/core.json', files.core],
+        ['tokens/light.json', files.light],
+        ['tokens/dark.json', files.dark],
+      ] as [string, object][]
+    ).map(([path, content]) => write(path, content)),
+  );
+}
+
+export class SdDemo extends LitElement {
+  static get styles() {
+    return [
+      css`
+        table {
+          text-align: left;
+          font-size: 12px;
+          margin-bottom: 2rem;
+        }
+
+        @keyframes render {
+          from {
+            background: #ccf;
+          }
+
+          to {
+            background: transparent;
+          }
+        }
+
+        th {
+          padding: 0 1em;
+          animation: 0.5s render;
+        }
+
+        .color-box {
+          display: inline-block;
+          margin-right: 0.5em;
+          vertical-align: sub;
+          width: 20px;
+          height: 20px;
+        }
+
+        details {
+          margin-top: 2em;
+        }
+      `,
+    ];
+  }
+
+  static get properties() {
+    return {
+      mode: {
+        state: true,
+      },
+      tokensArray: {
+        state: true,
+      },
+    };
+  }
+
+  declare _mode: 'dark' | 'light';
+  declare tokensArray: TransformedToken[];
+  declare themesData: Record<string, string[]>;
+  declare hasInitialized: Promise<void>;
+  declare editor: any;
+  declare hasInitializedResolve: () => void;
+
+  get mode() {
+    return this._mode;
+  }
+
+  set mode(v) {
+    this._mode = v;
+    this.onThemeChange();
+  }
+
+  constructor() {
+    super();
+    this.hasInitialized = new Promise((resolve) => {
+      this.hasInitializedResolve = resolve;
+    });
+    this.themesData = {};
+    this.tokensArray = [];
+    this.editor = undefined;
+    this.mode = 'dark';
+    this.init();
+  }
+
+  async init() {
+    await mirrorTokenFiles();
+    const permutateInput = this.mapToPermutateThemesInput(files.resolver);
+    this.themesData = permutateThemes(permutateInput);
+    await this.updateComplete;
+    const slotEl = this.shadowRoot?.querySelector('slot[name="monaco-editor"]') as HTMLSlotElement;
+    const editorElem = slotEl.assignedNodes()[0];
+    this.editor = await init(editorElem as HTMLDivElement);
+    this.editor.setValue(JSON.stringify(files.resolver, null, 2));
+    this.hasInitializedResolve();
+  }
+
+  async onThemeChange() {
+    await this.hasInitialized;
+    const sd = new StyleDictionary({
+      source: this.themesData[this.mode].map((themeSets: string) => `tokens/${themeSets}`),
+      log: {
+        verbosity: 'verbose',
+      },
+      platforms: {
+        foo: {
+          transforms: ['name/kebab'],
+        },
+      },
+    });
+    const { allTokens } = await sd.getPlatformTokens('foo');
+    this.tokensArray = allTokens;
+  }
+
+  mapToPermutateThemesInput(res: typeof files.resolver) {
+    let count = 0;
+    const resolveSetName = (setNameOrPath: string) => {
+      if (setNameOrPath.includes('.')) {
+        return [setNameOrPath];
+      }
+      return res.sets.find((set) => set.name === setNameOrPath)?.values;
+    };
+
+    return res.modifiers.reduce((acc, curr) => {
+      const variants = curr.values.map((variant) => ({
+        id: `${count++}`,
+        group: curr.name,
+        name: variant.name,
+        selectedTokenSets: Object.fromEntries(
+          variant.values.flatMap(resolveSetName).map((set) => [set, 'enabled']),
+        ),
+      })) as ThemeObject[];
+      return [...acc, ...variants];
+    }, [] as ThemeObject[]);
+  }
+
+  render() {
+    return html`
+      <label>
+        Mode
+        <select
+          @change=${(e: Event) =>
+            (this.mode = (e.target as HTMLSelectElement).value as 'light' | 'dark')}
+        >
+          <option value="dark">Dark</option>
+          <option value="light">Light</option>
+        </select>
+      </label>
+      ${this.tokensArray
+        ? html`<table>
+            <caption>
+              Tokens Table
+            </caption>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Resolved</th>
+                <th>Original</th>
+                <th>Type</th>
+              </tr>
+            </thead>
+            <tbody>
+              ${this.tokensArray.map(
+                (token) => html`
+                  <tr>
+                    <th>${token.name}</th>
+                    ${unsafeHTML(`<th>${this.renderValue(token)}</th>`)}
+                    ${unsafeHTML(`<th>${token.original.$value}</th>`)}
+                    <th>${token.$type}</th>
+                    ${unsafeHTML(`<th>${token.filePath}</th>`)}
+                  </tr>
+                `,
+              )}
+            </tbody>
+          </table>`
+        : ``}
+
+      <select
+        @change=${(e: Event) =>
+          this.switchFile((e.target as HTMLSelectElement).value as keyof typeof files)}
+      >
+        <option value="resolver">resolver.json</option>
+        <option value="core">tokens/core.json</option>
+        <option value="dark">tokens/dark.json</option>
+        <option value="light">tokens/light.json</option>
+      </select>
+      <slot name="monaco-editor"></slot>
+    `;
+  }
+
+  switchFile(file: keyof typeof files) {
+    this.editor.setValue(JSON.stringify(files[file], null, 2));
+  }
+
+  renderValue(token: TransformedToken) {
+    switch (token.$type) {
+      case 'color':
+        return `<div class="color-box" style="background-color: ${token.$value};"></div>${token.$value}`;
+      default:
+        return `${token.$value}`;
+    }
+  }
+}
+
+customElements.define('sd-demo', SdDemo);

docs/src/components/sd-demo/tokens/core.json

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+{
+  "colors": {
+    "$type": "color",
+    "black": {
+      "$value": "#000000"
+    },
+    "white": {
+      "$value": "#ffffff"
+    },
+    "gray": {
+      "100": {
+        "$value": "#f7fafc"
+      },
+      "200": {
+        "$value": "#edf2f7"
+      },
+      "300": {
+        "$value": "#e2e8f0"
+      },
+      "400": {
+        "$value": "#cbd5e0"
+      },
+      "500": {
+        "$value": "#a0aec0"
+      },
+      "600": {
+        "$value": "#718096"
+      },
+      "700": {
+        "$value": "#4a5568"
+      },
+      "800": {
+        "$value": "#2d3748"
+      },
+      "900": {
+        "$value": "#1a202c"
+      }
+    },
+    "orange": {
+      "100": {
+        "$value": "#fffaf0"
+      },
+      "200": {
+        "$value": "#feebc8"
+      },
+      "300": {
+        "$value": "#fbd38d"
+      },
+      "400": {
+        "$value": "#f6ad55"
+      },
+      "500": {
+        "$value": "#ed8936"
+      },
+      "600": {
+        "$value": "#dd6b20"
+      },
+      "700": {
+        "$value": "#c05621"
+      },
+      "800": {
+        "$value": "#9c4221"
+      },
+      "900": {
+        "$value": "#7b341e"
+      }
+    }
+  }
+}

docs/src/components/sd-demo/tokens/dark.json

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+{
+  "colors": {
+    "$type": "color",
+    "background": {
+      "primary": {
+        "$value": "{colors.orange.300}"
+      }
+    },
+    "foreground": {
+      "primary": {
+        "$value": "{colors.gray.100}"
+      }
+    }
+  }
+}

docs/src/components/sd-demo/tokens/light.json

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+{
+  "colors": {
+    "$type": "color",
+    "background": {
+      "primary": {
+        "$value": "{colors.orange.700}"
+      }
+    },
+    "foreground": {
+      "primary": {
+        "$value": "{colors.gray.900}"
+      }
+    }
+  }
+}