misskey/webpack/module/rules/fa.ts

/**
 * Replace fontawesome symbols
 */

const StringReplacePlugin = require('string-replace-webpack-plugin');

import * as fontawesome from '@fortawesome/fontawesome';
import * as regular from '@fortawesome/fontawesome-free-regular';
import * as solid from '@fortawesome/fontawesome-free-solid';
import * as brands from '@fortawesome/fontawesome-free-brands';

// Add icons
fontawesome.library.add(regular);
fontawesome.library.add(solid);
fontawesome.library.add(brands);

export default () => ({
	enforce: 'pre',
	test: /\.(tag|js|ts)$/,
	exclude: /node_modules/,
	loader: StringReplacePlugin.replace({
		replacements: [{
			pattern: /%fa:(.+?)%/g, replacement: (_, key) => {
				const args = key.split(' ');
				let prefix = 'fas';
				const classes = [];
				let transform = '';
				let name;

				args.forEach(arg => {
					if (arg == 'R' || arg == 'S' || arg == 'B') {
						prefix =
							arg == 'R' ? 'far' :
							arg == 'S' ? 'fas' :
							arg == 'B' ? 'fab' :
							'';
					} else if (arg[0] == '.') {
						classes.push('fa-' + arg.substr(1));
					} else if (arg[0] == '-') {
						transform = arg.substr(1).split('|').join(' ');
					} else {
						name = arg;
					}
				});

				const icon = fontawesome.icon({ prefix, iconName: name }, {
					classes: classes
				});

				if (icon) {
					icon.transform = fontawesome.parse.transform(transform);
					return `<i data-fa class="${name}">${icon.html[0]}</i>`;
				} else {
					console.warn(`'${name}' not found in fa`);
					return '';
				}
			}
		}]
	})
});