npm install gulp-lesshint --save-dev

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

gulp.task('lint', () => {
    return gulp.src('./src/*.less')
        .pipe(lesshint({
            // Options
        }))
        .pipe(lesshint.reporter('reporter-name')) // Leave empty to use the default, "stylish"
        .pipe(lesshint.failOnError()) // Use this to fail the task on lint errors
        .pipe(lesshint.failOnWarning()); // Use this to fail the task on lint warnings
});

• configPath
  • Pass a path to a valid configuration file and stop lesshint from looking for a .lesshintrc file.
• maxWarnings
  • The maximum number of warnings to allow, before failing the task. Omit this option to always allow the task to pass.

• lesshint.failOnError()
  • Use this to fail the task when there are at least one lint result with a severity of error.
• lesshint.failOnWarning()
  • Use this to fail the task when there are at least one lint result with a severity of warning.NOTE: this does not respect the maxWarnings option.

If no reporter name is passed, the default lesshint-reporter-stylish will be used which just prints everything with different colors. If you wish to specify your own, please refer to the lesshint reporter loading steps for the exact logic.

The following properties will be added to the file object.

file.lesshint.success = true; // or false
file.lesshint.resultCount = 0; // number of results returned by lesshint
file.lesshint.results = []; // lesshint results