build.js

#!/usr/bin/env node
import fs from 'node:fs/promises';
import path from 'node:path';
import {createRequire} from 'node:module';
import {fileURLToPath, pathToFileURL} from 'node:url';
import getWoff2 from './get-woff2.js';

const require = createRequire(import.meta.url);

const fontAwesomeDirectory = path.dirname(require.resolve('@fortawesome/fontawesome-free/package.json'));

export default async function build(outputDirectory, iconCharsSource, iconCharsExport = 'default') {
    const iconsImport = await import(pathToFileURL(path.resolve(iconCharsSource)));
    const iconChars = iconsImport[iconCharsExport];
    const files = Object.keys(iconChars).map(id => `${fontAwesomeDirectory}/svgs/solid/${id}.svg`);
    const woff2 = await getWoff2(files, 'cfware-icons', name => [iconChars[name]]);
    const iconsTemplate = await fs.readFile(fileURLToPath(new URL('icons-template.js', import.meta.url)), 'utf8');

    await fs.writeFile(
        path.join(outputDirectory, 'icons.js'),
        iconsTemplate
            .replace('{{font.woff2}}', Buffer.from(woff2).toString('base64'))
    );

    const fontAwesomeOutput = path.join(outputDirectory, 'fontawesome-free');
    await fs.mkdir(fontAwesomeOutput, {recursive: true});
    await fs.copyFile(path.join(fontAwesomeDirectory, 'LICENSE.txt'), path.join(fontAwesomeOutput, 'LICENSE.txt'));

    const packageInfo = JSON.parse(await fs.readFile(path.join(fontAwesomeDirectory, 'package.json'), 'utf8'));
    // Strip out npmjs.com generated package.json info except for _integrity.
    for (const key of Object.keys(packageInfo)) {
        if (key.startsWith('_') && key !== '_integrity') {
            delete packageInfo[key];
        }
    }

    await fs.writeFile(path.join(fontAwesomeOutput, 'package.json'), `${JSON.stringify(packageInfo, null, 2)}\n`);
}

build(...process.argv.slice(2)).catch(error => {
    console.error(error);
    process.exit(1);
});