swapped raw config func to promise with correct typing

Author: Alice

src/__tests__/index.test.ts

@@ -86,8 +86,8 @@ describe('index.js', () => {
   describe('#findState', () => {
     it('should throw err - serverless.yml not exists', () => {
       // stepFunctionsOfflinePlugin.serverless.config = process.cwd() + '/serverless.test.yml';
-      expect(stepFunctionsOfflinePlugin.hooks[global['hooks'].findState]).toThrowError(
-        'Could not find serverless manifest'
+      stepFunctionsOfflinePlugin.hooks[global['hooks'].findState]().catch(e =>
+        expect(e.message).toEqual('Could not find serverless manifest')
       );
     });
 

src/index.ts

@@ -196,7 +196,7 @@ export default class StepFunctionsOfflinePlugin implements Plugin {
       });
   }
 
-  getRawConfig(): Promise<any> {
+  async getRawConfig(): Promise<ServerlessWithError['service']> {
     const serverlessPath = this.serverless.config.servicePath;
     if (!serverlessPath) {
       throw new this.serverless.classes.Error('Could not find serverless manifest');
@@ -213,9 +213,15 @@ export default class StepFunctionsOfflinePlugin implements Plugin {
         `Could not find serverless manifest at path ${serverlessPath}. If this path is incorreect you should adjust the 'servicePath' variable`
       );
     }
-
+    let fromFile: ServerlessWithError['service'];
     if (/\.json|\.js$/.test(manifestFilename)) {
-      return import(manifestFilename);
+      try {
+        fromFile = await import(manifestFilename);
+        return fromFile;
+      } catch (err) {
+        console.error(err);
+        throw new Error(`Unable to import manifest at: ${manifestFilename}`);
+      }
     }
 
     return this.serverless.yamlParser.parse(manifestFilename);