✨(tokens) add JS generator and re-organize the repo

Added JsGenerator which to implied to reorganize a bit the
repo in order to extract generator-specific test into specific
standalone files.

packages/tokens/src/bin/Generators/JsGenerator.spec.ts

@@ -0,0 +1,30 @@
+import path from "path";
+import fs from "fs";
+import Config from "Config";
+import { run } from "ThemeGenerator";
+import { cleanup } from "tests/Utils";
+
+jest.mock("../Paths", () => ({
+  workPath: () => __dirname,
+}));
+
+describe("JsGenerator", () => {
+  beforeAll(() => {
+    jest.spyOn(console, "log").mockImplementation(() => {});
+    cleanup(__dirname);
+  });
+
+  afterEach(() => {
+    cleanup(__dirname);
+  });
+
+  it("generates valid JS file.", async () => {
+    const tokensFile = path.join(__dirname, Config.tokenFilenames.js);
+    expect(fs.existsSync(tokensFile)).toEqual(false);
+    await run(["", "", "-g", "js"]);
+    expect(fs.existsSync(tokensFile)).toEqual(true);
+    expect(fs.readFileSync(tokensFile).toString()).toEqual(
+      `export const tokens = {"colors":{"primary":"#055FD2","secondary":"#DA0000"}};`
+    );
+  });
+});