npm install gulp-clear-log4js

var gulp = require('gulp');
var clearLog = require('clear-log4js');

gulp.task('clear-log4js', function() {
    gulp.src('./*.*')
        .pipe(clearLog())
        .pipe(gulp.dest('./'));
});

gulp.task('default', ['clear-log4js']);

// Rerun the task when a file changes
gulp.task('watch', function () {
  gulp.watch('./*.*', ['clear-log4js']);
});