Gulp: Gulp watch don't overwrite files

[XaBerr]

When I launch gulp generates me the files, but when it enters the watch mode, understands that there was a change but does not overwrite files:

My gulp sample

var argv = require('yargs').argv;
var gulp = require('gulp');
var gulpif = require('gulp-if');
var uglify = require('gulp-uglify');

var dependencies = [
    'core-js/client/*.min.js',
    'zone.js/dist/zone.js',
    'reflect-metadata/Reflect.js',
    'systemjs/dist/system.src.js',
    'rxjs/**/*.js',
    '@angular/**/*.js',
    'angular2-in-memory-web-api/*.js',
];

var modules = [
    // Example: 'iconv-lite/**/*',
];

........
gulp.task("javascript", () => {
    return gulp.src([
        './bower_components/jquery/dist/jquery.min.js',
        './bower_components/bootstrap/dist/js/bootstrap.min.js',
    ])
        .pipe(gulp.dest("./build/js"))
});

gulp.task('styles', () => {
    var postcss      = require('gulp-postcss');
    var autoreset    = require('postcss-autoreset');
    var simplevars   = require('postcss-simple-vars');
    var nested       = require('postcss-nested');
    var lost         = require('lost');
    var cssnext      = require('postcss-cssnext');
    var processors = [
        simplevars(),
        nested(),
        lost(),
        cssnext(),
    ];
    return gulp.src([
            './src/css/*.css',
            './bower_components/openSans/openSans.css',
            './bower_components/components-font-awesome/css/font-awesome.min.css',
            './bower_components/bootstrap/dist/css/bootstrap.min.css',
        ])
        .pipe(postcss(processors))
        .pipe(gulp.dest('./build/css'));
});

gulp.task('ts', ['ts-app', 'ts-electron']);

gulp.task('build', ['templates', 'resources', 'styles', 'ts', 'libs', 'modules', 'images', 'javascript']);

gulp.task('watch', ['build'], () => {
    gulp.watch('./src/app/**/*', ['ts-app']);
    gulp.watch('./src/electron/**/*', ['ts-electron']);
    gulp.watch('./src/resources/**/*', ['resources']);
    gulp.watch('./src/css/**/*', ['styles']);
    gulp.watch('./src/templates/**/*', ['templates']);
    gulp.watch('./src/img/**/*', ['images']);
    gulp.watch('./src/js/**/*', ['javascript']);
});

Platform: Win7x64
NPM: 3.10.8
NODE: v6.7.0
Gulp version:

{
    "gulp": "^3.9.1",
    "gulp-if": "^2.0.1",
    "gulp-postcss": "^6.1.1",
    "gulp-pug": "^3.0.3",
    "gulp-typescript": "^2.13.6",
    "gulp-uglify": "^1.5.4",
}

What can I do to better understand the problem?

[sholladay]

I don't see it in your code sample, but is it possible you are using overwrite in gulp.dest() somewhere? It is supposed to be true by default, but that is one knob you could play with.

[XaBerr]

So I have to manually put gulp.dest("./build/", {overwrite: true})(in all gulp.dest) but nothing change :/

[phated]

Support questions should be directed to StackOverflow.