Visual Studio config issue: {} when src contains nested arrays

[davidparsson]

I'm seeing this error in 5.3.0, 5.3.1, 5.3.2 and 5.4.0, but not in 5.2.0:

Running "ts:app" (ts) task
Visual Studio config issue: {}
Warning: Task "ts:app" failed. Use --force to continue.

What caused this in my case seems to be that my src contains nested arrays. My configuration looks kind of like this:

applicationSources: [
  "app/file1.ts",
  "app/file2.ts"
],
ts: {
  app: {
    src: [
      "dependencies.ts",
      "<%= applicationSources %>"
    ],
    dest: "build/app.js"
  }
}

Grunt expands <%= applicationSources %>, turning src into this:

src: [
  "dependencies.ts",
  [
    "app/file1.ts",
    "app/file2.ts"
  ]
],

[davidparsson]

Oops, I found #323.