es-node-runner/lib/config.js

Node runner that transpiles typescript or es modules using blazing fast ⚡ esbuild and restarts the process automatically on change. Suitable for node development server.

import {resolve} from 'path';
import DEBUG from 'debug';
import {createRequire} from 'module';
const arg = process.argv.slice(2);
const idx = arg.indexOf('--debug');
if (idx !== -1) {
  DEBUG.enable(arg[idx + 1] ?? '*');
}
const debug = DEBUG('es-node-runner:config');
const isObject = (obj) => {
  return Boolean(obj) && typeof obj === 'object' && !Array.isArray(obj);
};
const overrideTargetObj = (target, source) => {
  for (const key in source) {
    if (Object.prototype.hasOwnProperty.call(target, key)) {
      if (isObject(source[key])) {
        overrideTargetObj(target[key], source[key]);
      } else {
        target[key] = source[key] ?? target[key];
      }
    }
  }
};
const loadConfig = async () => {
  debug('loading config');
  const cwd = process.cwd();
  const defaultConfig = {
    buildOptions: {
      entry: 'src/index.ts',
      outdir: 'node_modules/.cache/es-node-runner',
      outfile: 'bundle.js',
      target: 'node14',
      format: 'cjs',
      sourcemap: true,
    },
    watchOptions: {
      watch: 'src',
      ignore: undefined,
    },
    spawnOptions: {
      delay: 1000,
      restartCmd: 'rs',
      clearTerminal: false,
      autoRestart: true,
      logging: true,
      args: [],
    },
  };
  let userConfig;
  try {
    debug('looking for es-node-runner.config file');
    userConfig = (
      await import('file://' + resolve(cwd, 'es-node-runner.config.js'))
    ).default;
  } catch (error) {
    debug(
      'es-node-runner.config file not found...looking for config in package.json'
    );
    const require = createRequire(import.meta.url);
    const packageJson = require(resolve(cwd, 'package.json'));
    userConfig = packageJson['es-node-runner'] ?? {};
  }
  debug(
    Object.keys(userConfig).length === 0
      ? 'user config not found...using default config'
      : 'overriding default config with user config'
  );
  overrideTargetObj(defaultConfig, userConfig);
  debug('config loaded');
  return defaultConfig;
};
export const {buildOptions, watchOptions, spawnOptions} = await loadConfig();