dependency-smell-reporter/lib/analyze.js

A CLI tool that detects unused, outdated, and missing dependencies with reporting.

const depcheck = require("depcheck");
const ncu = require("npm-check-updates");
const path = require("path");
const ffs = require("fast-folder-size");

async function getFolderSizeInMB(folderPath) {
  return new Promise((resolve, reject) => {
    ffs(folderPath, (err, bytes) => {
      if (err) {
        console.error("❌ Error getting folder size:", err.message);
        return reject(err);
      }
      const mb = (bytes / 1024 / 1024).toFixed(2);
      console.log("📦 node_modules size (MB):", mb);
      resolve(mb);
    });
  });
}

async function analyzeDependencies(projectPath) {
  console.log("📁 Starting analyzeDependencies()...");

  try {
    console.log("🔍 Running depcheck...");
    const options = {
      ignoreDirs: ["dist", "build", "coverage"],
      ignoreMatches: ["eslint", "prettier"],
    };

    const depResult = await depcheck(projectPath, options);
    console.log("✅ depcheck done:", depResult);

    console.log("🔍 Running npm-check-updates...");
    const outdated = await ncu.run({
      packageFile: path.join(projectPath, "package.json"),
    });
    console.log("✅ outdated done:", outdated);

    const nodeModulesSize = await getFolderSizeInMB(
      path.join(projectPath, "node_modules")
    );

    const result = {
      unused: depResult.dependencies,
      missing: Object.keys(depResult.missing || {}),
      outdated: Object.keys(outdated),
      largeNodeModules: nodeModulesSize,
      usingTooMany: depResult.using ? Object.keys(depResult.using).length : 0,
    };

    console.log("✅ Final report:", result);
    return result;
  } catch (err) {
    console.error("❌ analyzeDependencies() failed:", err.message);
    throw err;
  }
}

module.exports = { analyzeDependencies };