What is the easiest layout tool for the BEM methodology, why does gulp-bem swear?

Question

BEM

I decided to try bem , looked at bem-tools, decided that it was too tricky, I needed something simpler, settled on gulp-bem :

C:\Users\krll\projects\holiday>node_modules\.bin\gulp
C:\Users\krll\projects\holiday\gulpfile.js:8
deps('blocks/page')
^
TypeError: object is not a function
    at Object.<anonymous> (C:\Users\krll\projects\holiday\gulpfile.js:8:1)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Liftoff.handleArguments (C:\Users\krll\projects\holiday\node_modules\gulp\bin\gulp.js:116:3)
    at Liftoff.<anonymous> (C:\Users\krll\projects\holiday\node_modules\gulp\node_modules\liftoff\index.js:181:16)
    at module.exports (C:\Users\krll\projects\holiday\node_modules\gulp\node_modules\liftoff\node_modules\flagged-respawn\index.js:17:3)

C:\Users\krll\projects\holiday>

gulpfile.js:

var gulp    = require('gulp');
var bem     = require('gulp-bem');
var concat  = require('gulp-concat');

var levels = ['base', 'blocks']
var deps = bem(levels);

deps('blocks/page')
    .pipe(bem.src('{bem}.css'))
    .pipe(concat('index.css'))
    .pipe(gulp.dest('./dist'));

Why does gulp-bem swear, what is it missing?
Or how to set up a gulpfile to start turning pages according to bem ' y?