check-deps.js

const fs = require("fs");
const path = require("path");
const readJson = require("read-package-json");

const readPkgJson = (path) => {
  return new Promise((resolve, reject) => {
    readJson(path, console.error, false, (err, data) => {
      if (err) {
        reject(err);
      } else {
        resolve(data);
      }
    });
  });
};

const checkDependencies = async (dir) => {
  const packageJsonPath = path.join(dir, "package.json");
  const nodeModulesPath = path.join(dir, "node_modules");

  const packageJson = await readPkgJson(packageJsonPath);
  const deps = [...Object.keys(packageJson.dependencies || {})];

  const browserOnly = [];
  const nodeAndBrowser = [];
  const nodeOnly = [];

  for (const dep of deps) {
    const depPackageJsonPath = path.join(nodeModulesPath, dep, "package.json");

    if (!fs.existsSync(depPackageJsonPath)) {
      console.error(`Cannot find module '${dep}' in node_modules.`);
      continue;
    }

    const depPackageJson = await readPkgJson(depPackageJsonPath);

    if (
      (depPackageJson.browser && depPackageJson.main) ||
      depPackageJson.module
    ) {
      nodeAndBrowser.push(dep);
    } else if (depPackageJson.browser && !depPackageJson.main) {
      browserOnly.push(dep);
    } else if (
      depPackageJson.main ||
      (depPackageJson.engines && !depPackageJson.browser)
    ) {
      nodeOnly.push(dep);
    }
  }

  return {
    browserOnly,
    nodeAndBrowser,
    nodeOnly,
  };
};

checkDependencies(".")
  .then((result) => {
    console.log("Browser only:", result.browserOnly);
    console.log("Node.js and Browser:", result.nodeAndBrowser);
    console.log("Node.js only:", result.nodeOnly);
  })
  .catch(console.error);