bable-cli ignores folder if there are just .ts files

[MikeMitterer]

Bug Report

Current Behavior
I have a folder (tools) with two .ts files in it.

If I run BABEL_ENV=node babel --extensions ".ts, .tsx" tools
I get an empty output.

If I run BABEL_ENV=node babel --extensions ".ts, .tsx" tools/fs-test
the file (it is a .ts file) gets compiled.

If I use webpack it works.

Expected behavior/code
Should compile the whole dir into one file like it is mentioned here: https://babeljs.io/docs/en/babel-cli/#compile-directories

Babel Configuration (.babelrc, package.json, cli command)

{
  "presets": [
    ["@babel/preset-env", {
      "targets": {
        "browsers": ["last 2 versions"]
      }
    }],
    "@babel/typescript"
  ],
  "plugins": [
    "@babel/proposal-class-properties",
    "@babel/proposal-object-rest-spread"
  ],
  "env": {
    "node": {
      "presets": [
        ["@babel/preset-env", {
          "targets": {
            "esmodules": true,
            "node": "current"
          },
          "modules": "auto"
        }]
      ]
    }
  }
}

Environment

• Babel version(s): 7.1.5 (@babel/core 7.1.6)

• Node/npm version: v11.2.0

• OS: ProductName: Mac OS X, ProductVersion: 10.11.6

• How you are using Babel: [e.g. cli, register, loader]

BTW: The whole bable/TS-Thing works great!!! (except this little issue)

[babel-bot]

Hey @MikeMitterer! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
community that typically always has someone willing to help. You can sign-up here
for an invite.

[wtgtybhertgeghgtwtg]

I think you're missing --out-dir.

[loganfsmyth]

You get no output because of #8668, but yeah really you want --out-dir