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https://github.com/WebReflection/ucompress

A micro, all-in-one, compressor for common Web files.
https://github.com/WebReflection/ucompress

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A micro, all-in-one, compressor for common Web files.

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README 

        
# µcompress



[![Build Status](https://travis-ci.com/WebReflection/ucompress.svg?branch=master)](https://travis-ci.com/WebReflection/ucompress) [![Coverage Status](https://coveralls.io/repos/github/WebReflection/ucompress/badge.svg?branch=master)](https://coveralls.io/github/WebReflection/ucompress?branch=master)



![compressed umbrellas](./test/ucompress.jpg)



**Social Media Photo by [Kevin Borrill](https://unsplash.com/@kev2480) on [Unsplash](https://unsplash.com/)**



A micro, all-in-one, compressor for common Web files, resolving automatically _JavaScript_ imports, when these are static.



### 📣 Community Announcement



Please ask questions in the [dedicated forum](https://webreflection.boards.net/) to help the community around this project grow ♥



---



## As CLI



Due amount of dependencies, it's recommended to install this module via `npm i -g ucompress`. However you can try it via `npx` too.



```sh

# either npm i -g ucompress once, or ...

npx ucompress --help

```



If `--source` and `--dest` parameter are passed, it will do everything automatically.



```sh

ucompress --source ./src --dest ./public

```



Check other flags for extra optimizations, such as `.json` headers files and/or `.br`, `.gzip`, and `.deflate` versions, which you can serve via NodeJS or Express, using [µcdn-utils](https://github.com/WebReflection/ucdn-utils#readme).



## As module



```js

import ucompress from 'ucompress';

// const ucompress = require('ucompress');



// define or retrieve `source` and `dest as you like



// automatic extension => compression

ucompress(source, dest).then(dest => console.log(dest));



// explicit compression

ucompress.html(source, dest).then(dest => console.log(dest));



// handy fallback

ucompress.copy(source, dest).then(dest => console.log(dest));

```



### Options



The optional third `options` _object_ parameter can contain any of the following properties:



  * `createFile`, a _boolean_ property, `false` by default, that will automatically pre-compress via _brotli_, _gzip_, and _deflate_, compatible files, plus it will create a `.json` file with pre-processed _headers_ details per each file

  * `maxWidth`, an _integer_ property, that if provided, it will reduce, if necessary, the destination image _width_ when it comes to _JPG_ or _PNG_ files

  * `maxHeight`, an _integer_ property, that if provided, it will reduce, if necessary, the destination image _height_ when it comes to _JPG_ or _PNG_ files

  * `preview`, a _boolean_ parameter, false by default, that creates _JPG_ counter `.preview.jpg` files to be served instead of originals, enabling bandwidth saving, especially for very big pictures (example: [with-preview](https://github.com/WebReflection/with-preview/#readme))

  * `noImport`, a _boolean_ parameter, false by default, that skips automatic _ESM_ `import` resolution, in case the site provides imports maps by itself

  * `noMinify`, a _boolean_ parameter, false by default, that keeps the `.js`, `.css`, and `.html` source intact, still performing other changes, such as `.js` imports



## As Micro CDN



If you'd like to use this module to serve files _CDN_ like, check **[µcdn](https://github.com/WebReflection/ucdn#readme)** out, it includes ucompress already, as [explained in this post](https://medium.com/@WebReflection/%C2%B5compress-goodbye-bundlers-bb66a854fc3c).



### Compressions



Following the list of tools ued to optimized various files:



  * **css** files via [csso](https://www.npmjs.com/package/csso)

  * **gif** files via [gifsicle](https://www.npmjs.com/package/gifsicle) as *optional dependency*

  * **html** files via [html-minifier](https://www.npmjs.com/package/html-minifier)

  * **jpg** or **jpeg** files via [sharp](https://github.com/lovell/sharp)

  * **js** or **mjs** files via [terser](https://github.com/terser/terser) and [html-minifier](https://github.com/kangax/html-minifier)

  * **json** files are simply parsed and stringified so that white spaces get removed

  * **md** files are transformed into their `.md.preview.html` version, if the _preview_ is enabled, through [marked](https://github.com/markedjs/marked)

  * **png** files via [pngquant-bin](https://www.npmjs.com/package/pngquant-bin)

  * **svg** files via [svgo](https://www.npmjs.com/package/svgo)

  * **xml** files via [html-minifier](https://www.npmjs.com/package/html-minifier)



### About Automatic Modules Resolution



If your modules are published as [dual-module](https://medium.com/@WebReflection/a-nodejs-dual-module-deep-dive-8f94ff56210e), or if you have a `module` field in your `package.json`, and it points at an _ESM_ compatible file, as it should, or if you have a `type` field equal to `module` and a `main` that points at an _ESM_ compatible, or if you have an `exports` field which `import` resolves to an _ESM_ compatible module, _µcompress_ will resolve that entry point automatically.



In every other case, the _import_ will be left untouched, eventually warning in console when such _import_ failed.



**Dynamic imports** are resolved in a very similar way, but composed imports will likely fail:



```js

// these work if the module is found in the source path

// as example, inside source/node_modules

import 'module-a';

import('module-b').then(...);



// these work *only* if the file is in the source path

// but not within a module, as resolved modules are not

// copied over, only known imports, eventually, are

import(`/js/${strategy}.js`);



// these will *not* work

import(condition ? 'condition-thing' : 'another-thing');

import('a' + thing + '.js');

```



### About `ucompress.createHeaders(path[, headers])`



This method creates headers for a specific file, or all files within a folder, excluding files that starts with a `.` dot, an `_` underscore, or files within a `node_modules` folder (_you know, that hole that should never fully land in production_).



```js

ucompress.createHeaders(

  // a folder with already optimized files

  '/path/static',

  // optional headers to set per folder

  {'Access-Control-Allow-Origin': '*'}

);

```



### Brotli, Deflate, GZip, and Headers



If the third, optional object, contains a `{createFile: true}` flag, each file will automatically generate its own related `.json` file which includes a [RFC-7232](https://tools.ietf.org/html/rfc7232#section-2.3.3) compliant _ETag_, among other details such as `last-modified`, `content-type`, and `content-length`.



The following file extensions, available via the `ucompress.encoded` _Set_, will also create their `.br`, `.deflate`, and `.gzip` version in the destination folder, plus their own `.json` file, per each different compression, but **only** when `{createFile: true}` is passed.



  * **.css**

  * **.html**

  * **.js**

  * **.mjs**

  * **.map**

  * **.json**

  * **.md**

  * **.svg**

  * **.txt**

  * **.woff2**

  * **.xml**

  * **.yml**



Incompatible files will fallback as regular copy `source` into `dest` when the module is used as callback, without creating any optimized version, still providing headers when the flag is used.