btroops/esbuild-server.mjs

import * as esbuild from 'esbuild';
import * as fs from 'node:fs';
import http from 'node:http';
import path from 'node:path';

const __dirname = path.dirname(new URL(import.meta.url).pathname);

const colors = {
  reset: '\x1b[0m',
  dim: '\x1b[2m',
  bright: '\x1b[1m',
  normal: '\x1b[22m',
  red: '\x1b[31m',
  green: '\x1b[32m',
  yellow: '\x1b[33m',
};

const mime = {
  '.svg': 'image/svg+xml; charset=utf-8',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.css': 'text/css; charset=utf-8',
  '.html': 'text/html; charset=utf-8',
};

const importSvg = {
  name: 'importSvg',
  setup(build) {
    const regex = new RegExp(/\.svg$/);

    build.onResolve({ filter: /\*\.svg$/ }, args => {
      console.log('onresolve', args);

      return {
        path: path.join('public', 'assets', args.path),
        namespace: 'svg-stub'
      }
    });

    build.onLoad({ filter: /\.svg$/, namespace: 'svg-stub' }, async (args) => {
      console.log('onload', args);

      const svgs = fs.readdirSync(path.resolve(path.dirname(args.path))).filter(fn => regex.test(fn));;

      console.log(svgs);

      console.log('resolved path', path.join(path.dirname(args.path), 'mapsheets.svg'));
      console.log('cwd', process.cwd());

      // const contents = `import mapsheets from ./${path.join(path.dirname(args.path), 'mapsheets.svg')};
      //   console.log('mapsheets', mapsheets);
      //   export default mapsheets;`;

      // const contents = `
      //   import svg from '/usr/src/app/public/assets/images/scenario-side_show.svg';
      //   export default svg;
      // `;

      // const contents = `
      //   import svg from '/usr/src/app/public/assets/images/scenario-side_show.svg';
      //   export default svg;
      // `;

      // const contents = `
      //   export { default as scenario_sideShow } from '/usr/src/app/public/assets/images/scenario-side_show.svg';
      //   export { default as mapsheets } from '/usr/src/app/public/assets/images/mapsheets.svg';
      // `;

      const contents = `
        // export { default as countorLines } from './contour-lines.svg';
        export { default as mapsheets } from './mapsheets.svg';
      `;

      console.log('resolveDir', path.dirname(args.path));
      console.log('contents', contents);

      return {
        contents: contents,
        resolveDir: path.dirname(args.path) //'./public/assets/images'
      }
    });

    // build.onLoad({ filter: /.*/, namespace: 'svg-stub' }, async (args) => ({
    //   contents: `import svg from ${JSON.stringify(args.path)}
    //     export default (imports) =>
    //       WebAssembly.instantiate(wasm, imports).then(
    //         result => result.instance.exports)`,
    // }));
  }
};

const svgUseCacheBust = {
  name: 'svgUseCacheBust',
  setup(build) {
    const regex = new RegExp('mapsheets\..+\.svg');

    build.onStart(() => {
      console.log("BUILD START");

      // const version = Date.now();
      // const file = fs.readFileSync('./src/scenario-side_show.svg', { encoding: 'utf-8' });
      // const newFile = file.replaceAll('%%VERSION%%', version);
      // fs.writeFileSync('./public/assets/images/scenario-side_show.svg', newFile);
      // const files = fs.readdirSync('./public/assets/images').filter(fn => regex.test(fn));
      // files.forEach(fn => fs.unlinkSync(`./public/assets/images/${fn}`));
      // fs.copyFileSync('./public/assets/images/mapsheets.svg', `./public/assets/images/mapsheets.${version}.svg`);
    })
  }
};

const resolveImportedSvg = {
  name: 'resolveImportedSvg',
  setup(build) {
    build.onStart(() => {
      console.log("BUILD STARTED");
    });

    build.onResolve({ filter: /\.svg$/ }, args => {
      return {
        path: path.resolve('public', args.path),
      };
    });
  }
}

const ctx = await esbuild.context({
  entryPoints: ['src/*.js'],
  bundle: true,
  outdir: 'build',
  plugins: [resolveImportedSvg],
  loader: {
    '.svg': 'file'
  },
  assetNames: 'assets/images/[name]-[hash]',
});

await ctx.watch();

const { host, port } = await ctx.serve({
  servedir: 'build',
  port: 3000,
  // onRequest: function({ remoteAddress, method, path, status, timeInMS }) {
  //   let statusColor = colors.red;

  //   if (status >= 200 && status <= 299) {
  //     statusColor = colors.green;
  //   } else if (status >= 300 && status <= 399) {
  //     statusColor = colors.yellow;
  //   }

  //   console.log(`${colors.dim}${remoteAddress} - "${method} ${path}" ${colors.normal}${statusColor}${status}${colors.reset}${colors.dim} [${timeInMS}ms]${colors.reset}`);
  // },
});

http.createServer((req, res) => {
  const options = {
    hostname: host,
    port: port,
    path: req.url,
    method: req.method,
    headers: req.headers,
  }

  const filename = req.url && req.url !== '/' ? req.url : 'index.html';
  const filepath = path.join(__dirname, 'public', filename);

  if (fs.existsSync(filepath)) {
    const readStream = fs.createReadStream(filepath, { autoClose: true });

    readStream.on('ready', () => {
      const type = mime[path.parse(filepath).ext] || 'application/octet-stream';
      console.log(`${req.method} ${req.url} => 200 ${type}`);
      res.writeHead(200, { 'content-type': type });
      readStream.pipe(res, { end: true });
    });

    readStream.on('error', err => {
      console.log(`${req.method} ${req.url} => 500 ${filepath} ${err.name}`);
      res.writeHead(500, err.name);
      res.end(JSON.stringify(err));
    });
  } else {
    const proxyReq = http.request(options, proxyRes => {
      const type = proxyRes.headers['content-type'];
      console.log(`${req.method} ${req.url} => ${proxyRes.statusCode} ${type} via esbuild`);
      res.writeHead(proxyRes.statusCode, { 'content-type': type });
      proxyRes.pipe(res);
    });

    req.pipe(proxyReq, { end: true });
  }
}).listen(8080);