gulpfile.js

'use strict';
const gulp = require('gulp');
const plugins = require('gulp-load-plugins')();
const paths = {
  tests: ['tests/**/**.js'],
  scripts: ['lib/**', 'tests/**', '!tests/config/**.yml']
};

/**
 * - Gulp task for linting all js scripts
 */

gulp.task('lint', function() {
  return gulp.src(paths.scripts)
    .pipe(plugins.jshint())
    .pipe(plugins.jshint.reporter('jshint-stylish', { verbose: true }));
});
/**
 * Gulp task to run tests
 *
 */

gulp.task('test', ['pre-test'], function() {
  return gulp.src(paths.tests, { read: false })
    // The reporter can be changed to preferable one
    .pipe(plugins.mocha())
    // Creating the reports after tests ran
    .pipe(plugins.istanbul.writeReports())
    // Enforce a coverage of at least 90%
    .pipe(plugins.istanbul.enforceThresholds({
      thresholds: { global: 90 }
    }));
});

/**
 * Watch for changes and lint in all ours scripts and lints
 */
gulp.task('watch', function() {
  gulp.watch(paths.scripts, ['lint']);
});

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

/**
 * Start gulp
 */

gulp.task('default', ['lint', 'watch']);