For node 8 jest >23

launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "name": "jest run current file",
            "request": "launch",
            "args": [
                "--runInBand",
                "--config=tests/client.jest.json",
                "${file}"
            ],
            "cwd": "${workspaceFolder}",
            "console": "internalConsole",
            "program": "${workspaceFolder}/node_modules/jest/bin/jest"
        }
    ]
}