Gulp 4 configuration for gulp-inject

Gulpfile.js

const gulp = require('gulp');
const inject = require('gulp-inject');


// use to concat css files
function injectIntoHTML() {
  // It's not necessary to read the files (will speed up things), we're only after their paths:
  let sources = gulp.src(['./src/**/*.js', './src/**/*.css'], {read: false});

  return gulp
    .src('./src/index.html')
    .pipe(inject(sources))
    .pipe(gulp.dest('./dist/'));
}

const InjectTasks = gulp.series([injectIntoHTML])

exports.inject = InjectTasks