gulpfile.js

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

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

gulp.task('lint', () =>
  gulp
    .src(paths.tests)
    .pipe(plugins.eslint())
    // eslint.format() outputs the lint results to the console.
    // Alternatively use eslint.formatEach() (see Docs).
    .pipe(plugins.eslint.format())
    // To have the process exit with an error code (1) on
    // lint error, return the stream and pipe to failAfterError last.
    .pipe(plugins.eslint.failAfterError())
);

/**
 * Gulp task to run tests
 *
 */

gulp.task('pre-test', () =>
  gulp
    .src(['lib/**/*.js'])
    .pipe(plugins.istanbul())
    .pipe(plugins.istanbul.hookRequire())
);

gulp.task(
  'test',
  gulp.series('pre-test', () =>
    gulp
      .src(paths.tests, { read: false })
      .pipe(plugins.mocha())
      .pipe(plugins.istanbul.writeReports())
      .pipe(plugins.istanbul.enforceThresholds({ thresholds: { global: 90 } }))
  )
);

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

/**
 * Start gulp
 */

gulp.task('default', gulp.series('lint', 'watch'));