This is a modified version of the plugin gulp-webp-html. Here was fixed thebug that added two dots before webp to the final html file. No SVG format.
// Input
<img src="/images/catalogImage.jpg">
// Output
<picture>
<source srcset="/images/catalogImage.webp" type="image/webp">
<img src="/images/catalogImage.jpg">
</picture>
// Input
<img src="/images/catalogImage.jpg" srcset="/images/catalogImage2x.jpg 2x">
// Output
<picture>
<source srcset="/images/catalogImage.webp, /images/catalogImage2x.webp 2x" type="image/webp">
<img src="/images/catalogImage.jpg" srcset="/images/catalogImage2x.jpg 2x">
</picture>
// Input
<img src="/images/catalogImage.svg">
// Output
<img src="/images/catalogImage.svg">npm i --save-dev gulp-webp-html-nosvglet webphtml = require('gulp-webp-html-nosvg');
gulp.task('html',function(){
gulp.src('./assets/**/*.html')
.pipe(webphtml())
.pipe(gulp.dest('./public/'))
});