fix: add wait for Storybook Preview API in stepsApi option

package.json

@@ -2,7 +2,7 @@
   "name": "storywright",
   "description": "Storybook setup.",
   "license": "MIT",
-  "version": "0.0.27-storybook7.14",
+  "version": "0.0.27-storybook7.15",
   "main": "lib/index.js",
   "module": "lib/index.js",
   "typings": "lib/index.d.ts",

src/StoryWrightProcessor/GetStoriesV2.js

@@ -14,7 +14,7 @@ function getStoriesWithSteps() {
     const errors = [];
     for (let story of Object.values(stories)) {
       try {
-        const steps = story.parameters?.storyWright.steps;
+        const steps = story.parameters?.storyWright?.steps;
         if (Array.isArray(steps)) {
           story.steps = steps;
         }

src/StoryWrightProcessor/StoryWrightProcessor.ts

@@ -54,6 +54,15 @@ export class StoryWrightProcessor {
           };
           const getStoriesScriptPath = scriptKind[options.stepsApi];
           const getStoriesScript = readFileSync(getStoriesScriptPath, "utf8");
+
+          if (options.stepsApi === "parameters") {
+            // Wait for Storybook Preview API to be available
+            // it's used in GetStoriesV2.js to access story parameters
+            await page.waitForFunction(() => {
+              return window["__STORYBOOK_PREVIEW__"];
+            });
+          }
+
           const { storiesWithSteps, errors } = await page.evaluate<{
             storiesWithSteps: Story[];
             errors: string[];