gulpfile.js

const gulp        = require('gulp');
const browserSync = require('browser-sync').create();
const sass        = require('gulp-sass');

// Compile Sass & Inject Into Browser
gulp.task('sass', function() {
    return gulp.src(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'])
        .pipe(sass())
        .pipe(gulp.dest("src/css"))
        .pipe(browserSync.stream());
});

// Move JS Files to src/js
gulp.task('js', function() {
    return gulp.src(['node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js','node_modules/popper.js/dist/umd/popper.min.js'])
        .pipe(gulp.dest("src/js"))
        .pipe(browserSync.stream());
});

// Watch Sass & Serve
gulp.task('serve', gulp.series('sass', function () {
    browserSync.init(
      {
        server: './src/'
      }
    );
  
    gulp.watch(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'], gulp.series('sass'));
    gulp.watch('src/*.html').on('change', browserSync.reload);
  }));

// Move Fonts to src/fonts
gulp.task('fonts', function() {
  return gulp.src('node_modules/font-awesome/fonts/*')
    .pipe(gulp.dest('src/fonts'))
})

// Move Font Awesome CSS to src/css
gulp.task('fa', function() {
  return gulp.src('node_modules/font-awesome/css/font-awesome.min.css')
    .pipe(gulp.dest('src/css'))
})

gulp.task('default', gulp.series('fa', 'fonts', 'js', 'serve'))