gulp-html-minimizer

Gulp plugin to minify HTML using the actively maintained HTMLMinifier fork.

Install

npm i --save-dev gulp-html-minimizer

Usage

const gulp = require("gulp");
const htmlMinimizer = require("gulp-html-minimizer");

export function minifyHTML() {
  return gulp
    .src("./src/index.html")
    .pipe(
      htmlMinimizer({
        // Optional option object - See below or HTMLMinifier for options
      })
    )
    .pipe(gulp.dest("./dist/"));
}

Options Quick Reference

Most of the options are disabled by default.

Option	Description	Default
skipInvalidFiles	Files with parsing errors will be skipped, rather than returning an error	undefined (could be true, false)
caseSensitive	Treat attributes in case sensitive manner (useful for custom HTML tags)	false
collapseBooleanAttributes	Omit attribute values from boolean attributes	false
collapseInlineTagWhitespace	Don't leave any spaces between display:inline; elements when collapsing. Must be used in conjunction with collapseWhitespace=true	false
collapseWhitespace	Collapse white space that contributes to text nodes in a document tree	false
conservativeCollapse	Always collapse to 1 space (never remove it entirely). Must be used in conjunction with collapseWhitespace=true	false
continueOnParseError	Handle parse errors instead of aborting.	false
customAttrAssign	Arrays of regex'es that allow to support custom attribute assign expressions (e.g. '<div flex?="{{mode != cover}}"></div>')	[ ]
customAttrCollapse	Regex that specifies custom attribute to strip newlines from (e.g. /ng-class/)
customAttrSurround	Arrays of regex'es that allow to support custom attribute surround expressions (e.g. <input {{#if value}}checked="checked"{{/if}}>)	[ ]
customEventAttributes	Arrays of regex'es that allow to support custom event attributes for minifyJS (e.g. ng-click)	[ /^on[a-z]{3,}$/ ]
decodeEntities	Use direct Unicode characters whenever possible	false
html5	Parse input according to HTML5 specifications	true
ignoreCustomComments	Array of regex'es that allow to ignore certain comments, when matched	[ /^!/, /^\s*#/ ]
ignoreCustomFragments	Array of regex'es that allow to ignore certain fragments, when matched (e.g. <?php ... ?>, {{ ... }}, etc.)	[ /<%[\s\S]*?%>/, /<\?[\s\S]*?\?>/ ]
includeAutoGeneratedTags	Insert tags generated by HTML parser	true
keepClosingSlash	Keep the trailing slash on singleton elements	false
maxLineLength	Specify a maximum line length. Compressed output will be split by newlines at valid HTML split-points
minifyCSS	Minify CSS in style elements and style attributes (uses clean-css)	false (could be true, Object, Function(text, type))
minifyJS	Minify JavaScript in script elements and event attributes (uses Terser)	false (could be true, Object, Function(text, inline))
minifyURLs	Minify URLs in various attributes (uses relateurl)	false (could be String, Object, Function(text))
preserveLineBreaks	Always collapse to 1 line break (never remove it entirely) when whitespace between tags include a line break. Must be used in conjunction with collapseWhitespace=true	false
preventAttributesEscaping	Prevents the escaping of the values of attributes	false
processConditionalComments	Process contents of conditional comments through minifier	false
processScripts	Array of strings corresponding to types of script elements to process through minifier (e.g. text/ng-template, text/x-handlebars-template, etc.)	[ ]
quoteCharacter	Type of quote to use for attribute values (' or ")
removeAttributeQuotes	Remove quotes around attributes when possible	false
removeComments	Strip HTML comments	false
removeEmptyAttributes	Remove all attributes with whitespace-only values	false (could be true, Function(attrName, tag))
removeEmptyElements	Remove all elements with empty contents	false
removeOptionalTags	Remove optional tags	false
removeRedundantAttributes	Remove attributes when value matches default.	false
removeScriptTypeAttributes	Remove type="text/javascript" from script tags. Other type attribute values are left intact	false
removeStyleLinkTypeAttributes	Remove type="text/css" from style and link tags. Other type attribute values are left intact	false
removeTagWhitespace	Remove space between attributes whenever possible. Note that this will result in invalid HTML!	false
sortAttributes	Sort attributes by frequency	false
sortClassName	Sort style classes by frequency	false
trimCustomFragments	Trim white space around ignoreCustomFragments.	false
useShortDoctype	Replaces the doctype with the short (HTML5) doctype	false

Additional info

For information regarding sorting attributes / style classes, ignoring chunks of markup, preserving SVG tags & working with invalid markup see HTMLMinifier fork