default gulp task with prompt

gulpfile.js

var prompt = require("gulp-prompt");

// Promts you to choose a task 
gulp.task('default', function() {
    var taskNames = [];
    for (var taskName in gulp.tasks) {
        if (gulp.tasks.hasOwnProperty(taskName)) {
            taskNames.push(taskName);
        }
    }

    return gulp.src('*').pipe(
        prompt.prompt({
            type: 'list',
            name: 'task',
            message: 'Choose task name',
            choices: taskNames
        }, function(userResponse){
            gulp.tasks[userResponse.task].fn();
        }));
});

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch",
            "type": "node",
            "request": "launch",
            "program": "${workspaceRoot}/node_modules/gulp/bin/gulp.js", // we will run gulp.js when hitting F5
            "stopOnEntry": false,
            "args": [], // name of the gulp task that will be run when we click F5 in VS Code
            "cwd": "${workspaceRoot}",
            "preLaunchTask": null,
            "runtimeExecutable": null,
            "runtimeArgs": [
                "--nolazy"
            ],
            "env": {
                "NODE_ENV": "development"
            },
            "console":"integratedTerminal",
            "sourceMaps": false,
            "outFiles": []
        },
        {
            "name": "Attach",
            "type": "node",
            "request": "attach",
            "port": 5858,
            "address": "localhost",
            "restart": false,
            "sourceMaps": false,
            "outFiles": [],
            "localRoot": "${workspaceRoot}",
            "remoteRoot": null
        },
        {
            "name": "Attach to Process",
            "type": "node",
            "request": "attach",
            "processId": "${command.PickProcess}",
            "port": 5858,
            "sourceMaps": false,
            "outFiles": []
        },
          {
            "name": "publish",
            "type": "node",
            "request": "launch",
            "program": "${workspaceRoot}/node_modules/gulp/bin/gulp.js",
            "stopOnEntry": false,
            "args": ["publish"],
            "cwd": "${workspaceRoot}",
            "preLaunchTask": null,
            "runtimeExecutable": null,
            "runtimeArgs": [
                "--nolazy"
            ],
            "env": {
                "NODE_ENV": "development"
            },
            "console":"internalConsole",
            "sourceMaps": false,
            "outDir": null
        }
    ]
}