latus/packages/core/src/build.js

import {
  basename,
  dirname,
  extname,
  join,
  resolve,
} from 'path';

import Latus from './latus';
import R from './require';
import root from './root';

const {
  LATUS_BABEL_CONFIG = require.resolve('@latus/build/build/.babelrc.js'),
  LATUS_ESLINT_DEFAULTS = require.resolve('@latus/build/build/.eslint.defaults.js'),
} = process.env;

export default (latus) => (neutrino) => {
  const airbnb = R('@neutrinojs/airbnb');
  airbnb({
    eslint: {
      cache: false,
      baseConfig: R(LATUS_ESLINT_DEFAULTS),
    },
  })(neutrino);
  const clean = R('@neutrinojs/clean');
  clean({
    cleanOnceBeforeBuildPatterns: ['**/*.hot-update.*'],
  })(neutrino);
  const {EnvironmentPlugin} = R('webpack');
  neutrino.config
    .plugin('environment')
    .use(EnvironmentPlugin, [{
      SIDE: 'server',
    }]);
  const node = R('@neutrinojs/node');
  node({
    babel: {
      configFile: LATUS_BABEL_CONFIG,
    },
  })(neutrino);
  const defaults = Object.keys(latus.originalConfig)
    .map((plugin) => {
      const config = {};
      [plugin, `${plugin}/server`].forEach((path) => {
        try {
          R.resolve(path);
          config[path] = {};
        }
        // eslint-disable-next-line no-empty
        catch (error) {}
      });
      return config;
    })
    .filter((config) => !!config)
    .reduce((r, o) => ({...r, ...o}), {});
  const config = Object.fromEntries(
    Object.keys(defaults)
      .map((path) => [
        path,
        latus.get(path),
      ]),
  );
  const babelOptions = neutrino.config.module
    .rules.store.get('compile')
    .uses.store.get('babel')
    .store.get('options');
  R('@babel/register')({
    plugins: babelOptions.plugins,
    presets: babelOptions.presets,
  });
  const paths = Object.keys(config)
    .map((path) => Latus.runtimePath(path))
    .filter((path) => !!path);
  const pathMap = paths.map((path) => `'${path}': require('${path}')`).join(', ');
  const source = [
    'global.$$latus = {',
    `  config: ${JSON.stringify(config)},`,
    `  modules: {${pathMap}},`,
    '};',
    'if (module.hot) {',
  ];
  paths.forEach((key) => {
    source.push(`  module.hot.accept('${key}', () => {`);
    source.push(`    global.latus.invoke('@latus/core/hmr', '${key}');`);
    source.push('  });');
  });
  source.push('}');
  // Everything's a simulation...
  const virtual = R.resolve(`${__dirname}/virtual`);
  neutrino.config
    .entry('index')
    .add(virtual);
  neutrino.config.module
    .rule(virtual)
    .test(virtual)
    .use('virtual')
    .loader(virtual)
    .options({
      source: source.join('\n'),
    });
  const mocha = R('@neutrinojs/mocha');
  mocha()(neutrino);
  if (process.env.LATUS_LINTING) {
    return;
  }
  const nodeExternals = R('webpack-node-externals');
  const allowlist = [
    /^@latus\/core\/virtual$/,
  ];
  if ('production' !== neutrino.config.get('mode')) {
    neutrino.config
      .entry('index')
      .prepend('dotenv/config');
    allowlist.push(/^webpack/);
    paths.forEach((path) => {
      const resolved = resolve(R.resolve(path));
      // Cheating for now...
      const parts = resolved.split('/');
      parts.splice(parts.indexOf('packages') + 2, 0, 'src');
      let source = parts.join('/');
      source = join(dirname(source), basename(source, extname(source)));
      allowlist.push(new RegExp(`^${path}$`));
      neutrino.config.resolve.alias
        .set(`${path}$`, source);
      neutrino.config.module
        .rule('compile').include.add(dirname(source));
    });
  }
  neutrino.config.externals(nodeExternals({
    allowlist,
  }));
  const entries = neutrino.config.entry('index');
  if (entries.has(`${R.resolve('webpack/hot/poll')}?1000`)) {
    entries.delete(`${R.resolve('webpack/hot/poll')}?1000`);
    entries.add('webpack/hot/signal');
  }
  entries.delete(join(root, 'src', 'index'));
  entries.add('@latus/core/start');
  if (process.argv.find((arg) => '--start-server' === arg)) {
    neutrino.config
      .plugin('start-server')
      .tap((args) => {
        const options = args[0];
        options.signal = true;
        const inspectArg = process.argv.find((arg) => -1 !== arg.indexOf('--inspect'));
        if (inspectArg) {
          options.nodeArgs.push(inspectArg);
        }
        const profArg = process.argv.find((arg) => -1 !== arg.indexOf('--prof'));
        if (profArg) {
          options.nodeArgs.push(profArg);
        }
        options.nodeArgs.push('--experimental-repl-await');
        options.nodeArgs.push('--unhandled-rejections=strict');
        return args;
      });
  }
  else {
    neutrino.config.plugins.delete('start-server');
  }
};