fix tsc updated typings

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

src/build.ts

@@ -91,7 +91,7 @@ async function build (args: string[]) {
   // parse yaml skeleton config
   let skeleton
   try {
-    skeleton = yamlParser.load(_yaml)
+    skeleton = yamlParser.load(_yaml) as T.TutorialSkeleton
     if (!skeleton || !Object.keys(skeleton).length) {
       throw new Error(`Skeleton at "${options.yaml}" is invalid`)
     }

src/validate.ts

@@ -9,6 +9,7 @@ import {
   createTestRunner
 } from './utils/exec'
 import { getCommits, CommitLogObject } from './utils/commits'
+import { TutorialSkeleton } from '../typings/tutorial'
 
 interface Options {
   yaml: string
@@ -34,14 +35,15 @@ async function validate (args: string[]) {
   // parse yaml config
   let skeleton
   try {
-    skeleton = yamlParser.load(_yaml)
+    skeleton = yamlParser.load(_yaml) as TutorialSkeleton
 
     if (!skeleton) {
       throw new Error('Invalid yaml file contents')
     }
   } catch (e) {
     console.error('Error parsing yaml')
     console.error(e.message)
+    return
   }
 
   const codeBranch: string = skeleton.config.repo.branch
@@ -106,7 +108,7 @@ async function validate (args: string[]) {
             await cherryPick(stepSetupCommits)
           }
           // run commands
-          if (step.setup.commands) {
+          if (step?.setup?.commands) {
             console.info(`--- Running setup commands...`)
             await runCommands(step.setup.commands)
           }

typings/tutorial.d.ts

@@ -86,3 +86,8 @@ export interface TutorialDependency {
 export interface TutorialAppVersions {
   vscode: string
 }
+
+export interface TutorialSkeleton {
+  config: TutorialConfig
+  levels: Level[]
+}