terminal-cv/node_modules/htmlnano/docs/versioned_docs/version-1.1.1/040-presets.md

Presets

A preset is just an object with modules config.

Currently the following presets are available:

• safe — a default preset for minifying a regular HTML in a safe way (without breaking anything)
• ampSafe - same as safe preset but for AMP pages
• max - maximal minification (might break some pages)

You can use them the following way:

const htmlnano = require('htmlnano');
const ampSafePreset = require('htmlnano').presets.ampSafe;
const options = {
    // Your options
};

htmlnano
    .process(html, options, ampSafePreset)
    .then(function (result) {
        // result.html is minified
    })
    .catch(function (err) {
        console.error(err);
    });

If you skip preset argument safe preset would be used by default.

If you'd like to define your very own config without any presets pass an empty object as a preset:

const htmlnano = require('htmlnano');
const options = {
    // Your options
};

htmlnano
    .process(html, options, {})
    .then(function (result) {
        // result.html is minified
    })
    .catch(function (err) {
        console.error(err);
    });

You might create also your own presets:

const htmlnano = require('htmlnano');
// Preset for minifying email templates
const emailPreset = {
    mergeStyles: true,
    minifyCss: {
        safe: true
    },
};

const options = {
    // Some specific options
};

htmlnano
    .process(html, options, emailPreset)
    .then(function (result) {
        // result.html is minified
    })
    .catch(function (err) {
        console.error(err);
    });

Feel free to submit a PR with your preset if it might be useful for other developers as well.