lcov.info is empty after upgrade to v14.

Link to bug demonstration repository

https://github.com/tufan-io/node-starter

Installation (nyc@v13)

cd  /tmp
git clone https://github.com/tufan-io/node-starter demo-app
cd demo-app
npm install
# ENTER x3 to power through the prompts

It installs all dependencies (slightly dated), but the build passes and reports the proper coverage @100%.

======================= Coverage summary =======================
Statements   : 100% ( 2/2 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 1/1 )
Lines        : 100% ( 2/2 )
=============================================================

Now upgrade to nyc@14 to see the problem

npm i nyc@14
npm run test

======================= Coverage summary =======================
Statements   : Unknown% ( 0/0 )
Branches     : Unknown% ( 0/0 )
Functions    : Unknown% ( 0/0 )
Lines        : Unknown% ( 0/0 )
=============================================================

Expected Behavior

A proper coverage report as with nyc@13 after the upgrade to nyc@14

Observed Behavior

with nyc@14, no coverage reports are being generated and the text-summary reports Unknown% ( 0/0 )

lcov.info nyc@13

$ ls -l coverage/lcov.info
-rw-r--r--  1 sramam  wheel  127 Apr 25 14:00 coverage/lcov.info

lcov.info nyc@14

$ ls -l coverage/lcov.info
-rw-r--r--  1 sramam  wheel  0 Apr 25 13:58 coverage/lcov.info

Troubleshooting steps

I have tried to change the package.json:nyc config from

# with nyc@13
"nyc": {
    "exclude": [
      "config/**/*",
      "dist/**/test/**/*.*",
      "dist/**/test/**/*.js"
    ]
}

to (and a couple more alternatives), but to no avail.

# with nyc@14
"nyc": {
    "exclude": [
      "config/**/*",
      "dist/**/test/**/*.*",
      "dist/**/test/**/*.js"
    ],
    "include": [
      "dist/**/*.js",
      "src/**/*.ts"
    ],
    "sourceMap": true,
    "instrument": true,
    "cache": true,
    "all": false
  },

What am I missing?

Environment Information

$ npx envinfo@latest --preset nyc
npx: installed 1 in 4.55s

  System:
    OS: macOS Mojave 10.14.3
    CPU: (4) x64 Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz
    Memory: 32.61 MB / 8.00 GB
  Binaries:
    Node: 11.12.0 - ~/.nvm/versions/node/v11.12.0/bin/node
    Yarn: 1.2.1 - ~/.yarn/bin/yarn
    npm: 6.5.0 - ~/trial/v1.0.0/demo-app/node_modules/.bin/npm
  npmPackages:
    nyc: ^14.0.0 => 14.0.0
    typescript: ^3.4.5 => 3.4.5

[sramam]

@relief-melone, can you try

{
    "reporter" : ["text-summary", "text"],
    "extension": [".ts"],
    "exclude": [
        "**/test/**"
    ]
}

[sramam]

indeed! nyc@14.1 seems to work much better.

with

  "nyc": {
    "extension": [
      ".ts",
      ".tsx"
    ],
    "exclude": [
      "**/test/**"
    ]
  },

I was able to get

=============================== Coverage summary ===============================
Statements   : 100% ( 2/2 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 1/1 )
Lines        : 100% ( 2/2 )
================================================================================