Local NGINX dev server script

nginx-dev-server.js

const path = require('path');
process.chdir(path.join(__dirname, '..'));

const fs = require('fs');
const child_process = require('child_process');

// replace with your own paths
// you can find the command for the nginxExe by running "which nginx" in the terminal
const nginxExe = '/usr/local/bin/nginx';
const mimeTypes = '/usr/local/etc/nginx/mime.types';
const nginxConf = path.join(__dirname, 'nginx.conf');
const devConf = path.join(__dirname, 'dev.conf');
const htmlRoot = path.join(__dirname, 'dist');

let nginxProcess;
createDevConf();
runNginx();
watchChangesInNginxConf();

function runNginx() {
    nginxProcess = child_process.spawn(nginxExe, ['-c', devConf]);
    nginxProcess.stdout.on('data', (data) => console.log(data.toString()));
    nginxProcess.stderr.on('data', (data) => console.error(data.toString()));
}

function recreateDevConfAndReload() {
    console.log('Reload');
    createDevConf();
    child_process.exec(nginxExe + ' -c ' + devConf + ' -s reload');
}

function watchChangesInNginxConf() {
    fs.watchFile(nginxConf, recreateDevConfAndReload);
}

function createDevConf() {
    let nginxConfContent = fs.readFileSync(nginxConf, 'utf-8');

    let devConfContent = nginxConfContent
        .replace(/user ([^\r\n]+)/, '')
        .replace(/pid ([^\r\n]+)/, 'daemon off;')
        .replace(/worker_processes\s+auto;/, 'worker_processes 1;')
        .replace(/include \s+\/etc\/nginx\/mime\.types;/, 'include ' + mimeTypes + ';')
        .replace(/error_log [^\r\n]+/, 'error_log /dev/stderr info;')
        .replace(/access_log [^\r\n]+/, 'access_log /dev/stdout main;')
        .replace(/root\s+\/usr\/share\/nginx\/html;/, 'root ' + htmlRoot + ';');
        // add more if needed

    fs.writeFileSync(devConf, devConfContent);
}

process.on('SIGTERM', () => {
    nginxProcess.stderr.destroy();
    nginxProcess.stdout.destroy();
    nginxProcess.kill();
});