How to get wdio running through IntelliJ run/debug configurations?

WebStorm doesn't provide any special support for wdio test runner. But you can still run/debug the tests using Node.js run configuration like the following:

But this doesn't work out of the box due to problems related to using non-tty environment (Node.js run console in IDEA is non-tty). As a workaround, please try commenting out if (process.stdin.isTTY) and else branch in node_modules\webdriverio\build\lib\cli.js:

//if (process.stdin.isTTY) {
    launch();
/*
} else {
   var stdinData = '';
    /!*
     * get a list of spec files to run from stdin, overriding any other
     * configuration suite or specs.
     *!/
    var stdin = process.openStdin();
    stdin.setEncoding('utf8');
    stdin.on('data', function (data) {
        stdinData += data;
    });
    stdin.on('end', function () {
        if (stdinData.length > 0) {
            args['specs'] = stdinData.trim().split(/\r?\n/);
        }
        launch();
    });
}*/

see WEB-31745