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caching - building sass and cache bust

Im a little stuck here. I use https://github.com/nmrugg/gulp-hash-src for cache busting. And there is a md5 hash added in my html file after I run "gulp css" for the first time. The problem is that when I change something in my sass files and run it again, the md5 hash is not updated. Apparantly gulp-hash-src is not seeing any changes.

My file structure:

  • gulpfile.js

  • resources/sass/site.scss

  • public/index.html

  • public/css/site.css

This is my gulp file:

var gulp = require('gulp'); 
var cssnano = require('gulp-cssnano'); 
var sass = require('gulp-sass'); 
var rtlcss = require('gulp-rtlcss');
var rename = require('gulp-rename');
var hashsrc = require("gulp-hash-src");

gulp.task('buildsass', function () {
    return gulp.src('resources/sass/site.scss')
        .pipe( sass() )
        .pipe(cssnano()) // minify
        .pipe( gulp.dest('public/css') );
});

gulp.task('rtl', function () {
    return gulp.src('public/css/site.css')
        .pipe(rtlcss())
        .pipe(rename('site-rtl.css'))
        .pipe(gulp.dest('public/css'));
});

gulp.task('hashcss', function(){  
    return gulp.src(['./public/*.html'])
        .pipe(hashsrc({build_dir: './public/css', src_path: './resources/sass', exts:['.css']}))
        .pipe(gulp.dest('./public'));
});

gulp.task('css', gulp.series('buildsass', 'rtl', 'hashcss'));

And my public/index.html

<!DOCTYPE html>
<html lang="nl" dir="ltr">
    <head>
        <title>The title for my website</title>

        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0">
        <meta name="description" content="">

        <link rel="preload" href="css/site.css?cbh=e5d09cb29de1b454b7de682c8572f767" as="style">
        <link rel="stylesheet" href="css/site.css?cbh=e5d09cb29de1b454b7de682c8572f767">
question from:https://stackoverflow.com/questions/65861448/building-sass-and-cache-bust

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