gulpfile.js

'use strict';
const {src, series} = require('gulp');
const path = require('path');
const eslint = require('gulp-eslint');
const excludeGitignore = require('gulp-exclude-gitignore');
const mocha = require('gulp-mocha');
const istanbul = require('gulp-istanbul');
const plumber = require('gulp-plumber');

function runStatic() {
  return src('**/*.js')
    .pipe(excludeGitignore())
    .pipe(eslint())
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
}

function runPreTest() {
  return src('generators\**\*.js')
    .pipe(istanbul({
      includeUntested: true
    }))
    .pipe(istanbul.hookRequire());
}

function runTest() {
  let mochaErr;

  src('test/**/*.js')
    .pipe(plumber())
    .pipe(mocha({reporter: 'spec'}))
    .on('error', function (err) {
      mochaErr = err;
    })
    .pipe(istanbul.writeReports())
    .on('end', function () {
      cb(mochaErr);
    });
}

const test = series(runStatic, runPreTest, runTest);

exports.test = test;