Not moving folders in Gulp 4 with commands?

Question

gulp.js

Here is the code in gulfile.js
//Include gulp modules
const gulp = require('gulp');
const concat = require('gulp-concat');
const cssFiles = [
'./src/css/main.css',
'./src/css/media.css'
]
const jsFiles= [
'src/js/lib.js',
'src/js/main.js '
]
//Task for CSS
styles function styles() {
//Template for searching CSS files
//All files matching the template './src/css/**/*.css'
return gulp.src(cssFiles)
//Output style folder
pipe(gulp.dest('./build/css'))
}
//Tack to js
scripts function scripts(){
return gulp.
pipe(gulp.dest('build/js'))
}
//The task that calls the styles function
gulp.task('styles', styles);
//Task that calls the scripts function
gulp.task('scripts', scripts);
When calling the gulp styles command in the terminal, it does not transfer the given files in the array to the build folder

Answer 1

gulp.task('copy', () =>
  gulp.src(['./src/css/**/*.css', './src/js/**/*.js'], {base: './src/'} )
  .pipe(gulp.dest('./build'))
);