gulpfile.js

const gulp = require('gulp');
const mocha = require('gulp-mocha');
const babel = require("gulp-babel");
const istanbul = require('gulp-istanbul');
const help = require('gulp-task-listing');
const del = require('del');

gulp.task('help', help);

gulp.task('default', ['transpile']);

const TRANSPILE_DEST_DIR = './dist';

// By default, individual js files are transformed by babel and exported to /dist
gulp.task('transpile', function () {
  return gulp.src("lib/*.js")
    .pipe(babel({ "presets": ["es2015"] }))
    .pipe(gulp.dest(TRANSPILE_DEST_DIR));
});

gulp.task('clean', function () {
  return del([TRANSPILE_DEST_DIR]);
})

gulp.task('test', ['transpile'], function(){
  return gulp.src('test/socket.io.js', {read: false})
    .pipe(mocha({
      slow: 200,
      reporter: 'spec',
      bail: true,
      timeout: 10000
    }))
    .once('error', function (err) {
      console.error(err.stack);
      process.exit(1);
    })
    .once('end', function () {
      process.exit();
    });
});

gulp.task('set-compat-node-env', function() {
  process.env.TEST_VERSION = 'compat';
});

gulp.task('test-compat', ['set-compat-node-env', 'test']);

gulp.task('istanbul-pre-test', function () {
  return gulp.src(['lib/**/*.js'])
    // Covering files
    .pipe(istanbul())
    // Force `require` to return covered files
    .pipe(istanbul.hookRequire());
});

gulp.task('test-cov', ['istanbul-pre-test'], function(){
  return gulp.src('test/socket.io.js', {read: false})
    .pipe(mocha({
      reporter: 'dot'
    }))
    .pipe(istanbul.writeReports())
    .once('error', function (err){
      console.error(err.stack);
      process.exit(1);
    })
    .once('end', function (){
      process.exit();
    });
});