gulpfile.js
import gulp from 'gulp';
import babel from 'gulp-babel';
const compile = (cb) => {
gulp.src('server/**/*.js')
.pipe(babel())
.pipe(gulp.dest('dist'));
cb();
};
const compileTest = (cb) => {
gulp.src('__tests__/server/**/*.js')
.pipe(babel())
.pipe(gulp.dest('dist/__tests__'));
cb();
};
exports.build = gulp.series(gulp.parallel(compile, compileTest));