Webpack tree shaking for Font Awesome 5

For those who not familiar with modern frontend development and getting tired to wait for subsetter from FA team it's here if you don't know (PRO only)

Beginners guide

First of all - install node for your platform from here

Then, if you have git installed, create a directory for this project, open it in the console/terminal and type

git clone https://github.com/ArroWsGM/fa5-subsetter.git

or just download the archive, unzip and open project directory in the console.

Make sure, you in the right place: in this directory (fa5-subsetter) must present files package.json, webpack.config.js etc.

Type in the console

npm i

and wait until node downloads all dependencies.

Open src/font-awesome-5-custom-bundle.js in your favorite text editor and add/replace/delete icons:

icons distributed around 7 packages: @fortawesome/free-brands-svg-icons, @fortawesome/free-regular-svg-icons, @fortawesome/free-solid-svg-icons, @fortawesome/pro-solid-svg-icons, @fortawesome/pro-regular-svg-icons, @fortawesome/pro-light-svg-icons and @fortawesome/pro-duotone-svg-icons
all free packages @fortawesome/free-brands-svg-icons, @fortawesome/free-regular-svg-icons, @fortawesome/free-solid-svg-icons already installed with previous npm i command
to install package, type (for example, for brands icons pack)

npm i -D @fortawesome/free-brands-svg-icons

to remove package, type (for brands icons pack)

npm un @fortawesome/free-brands-svg-icons

you can install all packages, it does not have any impact to final build size
to install a pro package you need to do some tweaks, as described here in Installing the Pro version of Font Awesome section
pro packages include all icons from corresponding free package, you don't need to include them both in the font-awesome-5-custom-bundle.js source file, there are comment in places, where you need to substitute packages
brands have no pro version, as same as light and duotone have no free package
all icons have a camel-cased names (for example: faGooglePlay for fa-google-play html class)
if you have a doubt about icon name spelling, take a look inside node_modules/@fortawesome folder, pick a folder with corresponding package name (but this is not necessarily, icons have the same names through regular, solid and light packages, but some of those icons may not exist in the free packages)
to add an icon in a final bundle, you need to add its name into corresponding import statement, if an icon is from regular, solid or light packages, you also need to add an icon alias, for resolving it in the next step

next, add icon names or their aliases into library import statement, for example:

import facebook icon:

import {
    faFacebook,
} from '@fortawesome/free-brands-svg-icons'

library.add(
    faFacebook,
)

add calendar regular icon:

import {
    faFacebook,
} from '@fortawesome/free-brands-svg-icons'

import {
    faCalendar as         faCalendarRegular,
} from '@fortawesome/free-regular-svg-icons'

library.add(
    faFacebook,
    faCalendarRegular,
)

add calendar solid icon:

import {
    faFacebook,
} from '@fortawesome/free-brands-svg-icons'

import {
    faCalendar as         faCalendarRegular,
} from '@fortawesome/free-regular-svg-icons'

import {
    faCalendar as         faCalendarSolid,
} from '@fortawesome/free-solid-svg-icons'

library.add(
    faFacebook,
    faCalendarRegular,
    faCalendarSolid,
)

add instagram icon:

import {
    faFacebook,
    faInstagram,
} from '@fortawesome/free-brands-svg-icons'

import {
    faCalendar as         faCalendarRegular,
} from '@fortawesome/free-regular-svg-icons'

import {
    faCalendar as         faCalendarSolid,
} from '@fortawesome/free-solid-svg-icons'

library.add(
    faFacebook,
    faInstagram,
    faCalendarRegular,
    faCalendarSolid,
)

After adding all desired icons, save the file, and, finally, you need to build your bundle:

npm run build

then grab your three-shaked Font Awesome build from dist directory

This package already contains dist bundle with some frequently used icons, just open index.html and you can see it by yourself