uglified files are not rewritten in html file using gulp-usemin

Question

I am facing a problem with gulp-usemin plugin. when usemin task is running it is concating and uglifying css and js files, but the uglified js files are not rewritten in html file though it is generated. I am sharing my gulpfile.js and index.html code .

index.html before conversion

<html>
    <head>
        <!-- build:css build/css -->
        <link rel="stylesheet" href="css/blue.css">
        <link rel="stylesheet" href="css/green.css">
        <link rel="stylesheet" href="css/orange.css">
        <!-- endbuild -->
        <!-- build:js build/js1 -->
        <script src="js/add.js"></script>
        <script src="js/sub.js"></script>
        <script src="js/mul.js"></script>
        <!-- endbuild -->
    </head>
    <body>

        <p class="blue" id="sum"></p>
        <p class="green" id="diff"></p>
        <p class="orange" id="mul"></p>
        <img src="images/1.jpg" width="304" height="228">
        <img src="images/2.jpg" width="304" height="228">

        <script>
        document.getElementById('sum').innerHTML=add(4,4);
        document.getElementById('diff').innerHTML=sub(4,4);
        document.getElementById('mul').innerHTML=mul(4,4);

        </script>
    </body>
</html>

gulpfile.js

var usemin = require('gulp-usemin');
var gulp = require('gulp');
var uglify = require('gulp-uglify');
var minifyHtml = require('gulp-minify-html');
var minifyCss = require('gulp-minify-css');
var jshint = require('gulp-jshint');
var concat = require('gulp-concat');
var rev = require('gulp-rev'),
    notify = require('gulp-notify');

gulp.task('usemin', function() {
  gulp.src('./*.html')
    .pipe(usemin({
      css: [minifyCss(), 'concat'],
      html: [minifyHtml({empty: true})],
      js: [uglify()]
    }))
    .pipe(gulp.dest('build/'));
});

index.html after conversion

//you can see that build/css is generated but build/js is not generated
<html>
    <head>
    <link rel="stylesheet" href="build/css"/>

    </head>
    <body>

    <p class="blue" id="sum"></p>
    <p class="green" id="diff"></p>
    <p class="orange" id="mul"></p>
    <img src="images/1.jpg" width="304" height="228">
    <img src="images/2.jpg" width="304" height="228">

    <script>
    document.getElementById('sum').innerHTML=add(4,4);
    document.getElementById('diff').innerHTML=sub(4,4);
    document.getElementById('mul').innerHTML=mul(4,4);

    </script>
    </body>
</html>

Help me in fixing this issue. Thanks in advance .

Preview · Accepted Answer · 2015-04-09T16:39:32.127

First, you are missing the rev in your js usemin call, change your task to:

gulp.task('usemin', function() {

  gulp.src('./*.html')
    .pipe(usemin({
      css: [minifyCss(), 'concat'],
      html: [minifyHtml({empty: true})],
      js: [uglify(), rev()]
    }))
    .pipe(gulp.dest('build/'));

  });

Also, the last parameter of the blocks in gulp-usemin represent the path of a file. You should precise the extension to not confuse with a directory

<!-- build:css build/style.css -->

<!-- build:js build/js1.js -->

For clarity, you should also put a line break between the two different blocks.

uglified files are not rewritten in html file using gulp-usemin

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