gulp-srcset-lazy

(clone of the innactive gulp-img-retina repo with some improvements)

Add img attribute 'srcset' for variable density/width image loading for lazyload data attributes (specifically webp).

Prerequisites

You must have webp images in the folder which the original image in.

Install

npm install gulp-srcset-lazy

Usage

var gulp = require('gulp');
var srcsetLazy = require('gulp-srcset-lazy');
 
var retinaOpts = {
    // Your options here.
};
 
gulp.task('views', function() {
 
  return gulp.src('./views/**/*.html')
    .pipe(srcsetLazy(retinaOpts))
    .on('error', function(e) {
      console.log(e.message);
    })
    .pipe(gulp.dest('./build'));
 
});

You put html in:

<figure>
    <img src="images/default/example.webp" alt="example image" />
</figure>

And get html out:

<figure>
    <img data-src="images/default/example.webp" alt="example image" data-srcset="images/default/example.webp 1x, images/default/[e-mail] 2x, images/default/[e-mail] 3x, images/default/example-mobile.webp 480w" />
</figure>

Options (Optional)

options.suffix

Type: Object

Default:

srcsetLazy({
  suffix: {
    '1x': '.webp',
    '2x': '@2x.webp',
    '3x': '@3x.webp'
  }
})

The suffix will insert to image's path, the key is resolution, and value is suffix.

You can also use width srcset params eg.

srcsetLazy({
  suffix: {
    '1x': '.webp',
    '2x': '@2x.webp',
    '3x': '@3x.webp',
    '480w': '-mobile.webp'
  }
})

Note

SVG's are ignored