✨(react) add tokens.ts files handling

These files will be used to define the custom design tokens per components.
They are automatically aggregated by the packages/react/cunningham.ts file,
this is why handling typescript config file was important.

packages/react/src/tests/Theme.ts

@@ -0,0 +1,33 @@
+import child_process from "child_process";
+import path from "path";
+
+/**
+ * Run the NPM script 'build-theme' in order to generate the tokens files ( cunningham-token.ts|css ).
+ * ( The purpose is mainly to generate the tokens files and then verify in tests that custom tokens defined in
+ * tokens.ts files are correctly taken into account. )
+ */
+export const buildTheme = (debug?: boolean) => {
+  const child = child_process.exec(
+    "cd " + path.join(__dirname, "..", "..") + " && yarn build-theme"
+  );
+  return new Promise<void>((resolve) => {
+    child.stdout?.on("data", (data) => {
+      // eslint-disable-next-line no-console
+      if (debug) console.log("stdout: " + data);
+    });
+    child.stderr?.on("data", (data) => {
+      // eslint-disable-next-line no-console
+      if (debug) console.log("stderr: " + data);
+    });
+    child.on("close", (code) => {
+      // eslint-disable-next-line no-console
+      if (debug) console.log("closing code: " + code);
+      resolve();
+    });
+  });
+};
+
+export const loadTokens = async () => {
+  const module = await import("../cunningham-tokens");
+  return module.tokens;
+};