How to write date at the end of CSS file in GULP?

Question

gulp.js

Greetings, the question may not have been quite correctly posed, but the point is, how to add a date to the final css file in GULP? This is necessary so that the static version of the file is updated, and so that the client does not clear the browser cache for updating.

Did you usually do this with your hands before without GULP? added ?v=3 at the end of CSS and so on 4,5,6

<link rel="stylesheet" type="text/css" href="/css/style.css?v=3">

In php, it’s simple, the date was displayed with hours and minutes, for example,

<link rel="stylesheet" type="text/css" href="/css/style.css?v=202102081545">

How would you do the same in GULP? What would the date be substituted at the end of the file?

I found the date function itself, added it to gulpfile.js

function getDateTime() {
        var now     = new Date(); 
        var year    = now.getFullYear();
        var month   = now.getMonth()+1; 
        var day     = now.getDate();
        var hour    = now.getHours();
        var minute  = now.getMinutes();
        var second  = now.getSeconds(); 
        if(month.toString().length == 1) { var month = '0'+month; }
        if(day.toString().length == 1) { var day = '0'+day; }   
        if(hour.toString().length == 1) { var hour = '0'+hour; }
        if(minute.toString().length == 1) { var minute = '0'+minute; }
        if(second.toString().length == 1) { var second = '0'+second; }   
        var dateTime = year+'-'+month+'-'+day+'T'+hour+':'+minute+':'+second;   
        return dateTime;
    }

But I don’t know how to paste getDateTime() in the output file here

// styles
const styles = () => {
  return src(config.styles.src)
    .pipe(
      sass({
        outputStyle: "expanded"
      })
    )
    .pipe(
      group_media()
    )
    .pipe(postcss([
      require('autoprefixer'),
      require('postcss-discard-comments'),
      require('postcss-csso')
    ]))
    .pipe(
      rename({
        extname: ".min.css" 
       //extname: ".min.css?v=" + getDateTime() //если так сделать ошибка, не получается
      })
    )

    .pipe(dest(config.styles.dist))
    .pipe(server.stream());
}

Answer 1

<link
 rel="stylesheet"
 href="/css/style.css?v=%NO_CACHE%"
>

const replace = require('gulp-replace');
 
gulp.task('html', function(){
  gulp.src(['index.html'])
    // … other pipes
    .pipe(replace('%NO_CACHE%', (new Date)->getTime()))
    .pipe(gulp.dest('build/'));
});

or

const replace = require('gulp-replace');
 
gulp.task('html', function(){
  gulp.src(['index.html'])
    .pipe(replace('%NO_CACHE%', function() {
      const md5hash = checkCss('style.css'); // read css file and calculate md5 hash
      return md5hash;
    }))
    .pipe(gulp.dest('build/'));
});

Answer 2

The most popular Gulp file versioning plugin is gulp-rev . There is also the gulp-rev-all plugin , which takes into account changes not only to the file itself, but also to its dependencies (for example, if an image or font connected in css changes, this plugin will see this and also update the version of the style file).

Answer 3

You need something like gulp-buster . It will create a file with the hash of the files and use that in php as a version.