An HTML minifier in pure Swift.
Zero dependencies, comprehensive test suite (149 tests ported from html-minifier-next), replicates the output of html-minifier-next with the following options:
| html-minifier-next option | Notes |
|---|---|
caseSensitive: true |
Preserves tag and attribute name case |
collapseBooleanAttributes: true |
Also handles draggable, crossorigin, contenteditable |
collapseWhitespace: true |
Inline/block-aware smart collapsing |
removeComments: true |
Keeps <!--! --> bang comments and conditional comments |
removeEmptyAttributes: true |
class, id, style, title, lang, dir, value, event handlers |
removeRedundantAttributes: true |
Default values, script language/charset, a[name] matching id |
removeScriptTypeAttributes: true |
Removes type="text/javascript" and variants |
removeStyleLinkTypeAttributes: true |
Removes type="text/css" from <style> and <link> |
useShortDoctype: true |
All doctypes become <!doctype html> |
Include Bonsai in your Package.swift:
let package = Package(
dependencies: [
.package(url: "https://github.com/loopwerk/Bonsai", from: "1.0.0"),
],
targets: [
.target(
name: "MyProject",
dependencies: ["Bonsai"]),
]
)Using it is a simple import and function call:
import Bonsai
let result = Bonsai.minifyHTML("<html>")There are no options or settings to configure.
Benchmarked on a ~143 KB HTML page (1000 iterations, release build), using a M1 Max Macbook Pro:
| Tool | Avg time per operation | Throughput |
|---|---|---|
| html-minifier (Node.js) | 12.1 ms | 83 ops/sec |
| html-minifier-terser (Node.js) | 14.3 ms | 70 ops/sec |
| html-minifier-next (Node.js) | 0.6 ms | 1,817 ops/sec |
| Bonsai (Swift) | 0.9 ms | 1,149 ops/sec |
The speed difference between Bonsai and html-minifier-next only becomes noticeable at scale; for individual pages, both finish under a millisecond.
To run the benchmark yourself:
# Swift (release mode)
swift run -c release BonsaiBenchmark
