Update dependencies, add yarn.lock

gulpfile.js

@@ -1,7 +1,6 @@
 var path = require('path');
 var source = require('vinyl-source-stream');
 var minimist = require('minimist');
-var gulpif = require('gulp-if');
 var gulp = require('gulp');
 var gutil = require('gulp-util');
 var preprocess = require('gulp-preprocess');
@@ -10,8 +9,6 @@ var browserify = require('browserify');
 var babelify = require('babelify');
 var tsify = require('tsify');
 var stylus = require('gulp-stylus');
-var minifyCss = require('gulp-minify-css');
-var streamify = require('gulp-streamify');
 var autoprefixer = require('gulp-autoprefixer');
 var rename = require('gulp-rename');
 
@@ -41,9 +38,10 @@ function buildHtml(src, dest, context) {
 
 function buildStyl(src, dest, mode) {
   return gulp.src(src)
-    .pipe(stylus())
-    .pipe(streamify(autoprefixer({ browsers: ['and_chr >= 50', 'ios_saf >= 9']})))
-    .pipe(gulpif(mode === 'release', minifyCss()))
+    .pipe(stylus({
+      compress: mode === 'release'
+    }))
+    .pipe(autoprefixer({ browsers: ['and_chr >= 50', 'ios_saf >= 9']}))
     .pipe(rename('app.css'))
     .pipe(gulp.dest(dest + '/css/compiled/'));
 }

package.json

@@ -25,22 +25,17 @@
   "devDependencies": {
     "babel-plugin-transform-react-jsx": "~6.8.0",
     "babel-plugin-transform-react-require": "~1.0.1",
-    "gulp": "~3.9.0",
-    "gulp-autoprefixer": "~2.0.0",
-    "gulp-if": "~1.2.5",
-    "gulp-minify-css": "~0.3.11",
-    "gulp-preprocess": "~1.1.1",
+    "gulp": "~3.9.1",
+    "gulp-autoprefixer": "~3.1.1",
+    "gulp-preprocess": "~2.0.0",
     "gulp-rename": "~1.2.2",
-    "gulp-streamify": "~0.0.5",
-    "gulp-stylus": "~1.3.3",
-    "gulp-util": "~3.0.1",
-    "minimist": "~1.1.0",
+    "gulp-stylus": "~2.6.0",
+    "gulp-util": "~3.0.7",
+    "minimist": "~1.2.0",
     "ncp": "~2.0.0",
-    "q": "~1.1.2",
-    "stylus": "~0.49.1",
-    "tsify": "2.0.1",
+    "tsify": "~2.0.3",
     "typescript": "~2.0.6",
-    "vinyl-source-stream": "~1.0.0",
+    "vinyl-source-stream": "~1.1.0",
     "yargs": "~1.3.1"
   },
   "dependencies": {

tsconfig.json

@@ -5,6 +5,7 @@
     "module": "commonjs",
     "noImplicitAny": true,
     "suppressImplicitAnyIndexErrors": true,
+    "strictNullChecks": false,
     "jsx": "preserve"
   },
   "include": [