README.md

scan-dependencies

Usage : node scan-dependencies.js <path>

• will find every root project inside <path> (a project is a folder with package.json file, himself not inside a node_modules directory)
• will npm install then npm outdated from project
• will list all *.js files and check for missing require(…) for every dependency

scan-dependencies.js

#!/usr/bin/env node

const path = require('path')
const { readdirSync, statSync, accessSync, readFileSync } = require('fs')
const { execSync } = require('child_process')

const baseDir = path.resolve(process.argv[2] || '.')

const exists = f => { try { return accessSync(f), true } catch (e) { return false } }
const isDir = d => exists(d) && statSync(d).isDirectory()
const isFile = f => exists(f) && statSync(f).isFile()
const readDirAbs = d => readdirSync(d).map(f => path.join(d, f))
const findFiles = d => readDirAbs(d).reduce((fs, f) => fs.concat(isFile(f) ? [f] : findFiles(f)), [])
const testFiles = (files, test) => files.filter(f => test(readFileSync(f, 'utf8')))
const isNotInSubModule = f => f.indexOf(path.sep + 'node_modules' + path.sep) === -1
const findScripts = d => findFiles(d).filter(isNotInSubModule).filter(f => f.match(/\.js$/))

const findRoots = d =>
  readDirAbs(d)
  .filter(isNotInSubModule)
  .filter(isDir)
  .reduce((ds, d) => ds
    .concat(exists(path.join(d, 'package.json')) ? [d] : [])
    .concat(findRoots(d))
  , [])

const checkDeps = (files, deps, dev = false) => {
  if (deps.length === 0) {
    return
  }
  console.log(`\tChecking ${dev?'dev ':''} dependencies…`)
  deps.forEach(m => {
    const req = new RegExp(`require\\(['"]${m}['"]\\)`)
    const reqFiles = testFiles(files, req.test.bind(req))
    if (reqFiles.length === 0) {
      console.log(`\t\t${m}: UNUSED?`)
    } else {
      console.log(`\t\t${m}: Used in ${reqFiles.length} file(s)`)
    }
  })
}

findRoots(baseDir)
.forEach(d => {
  console.log(`Testing ${d}…`)
  const pkg = require(path.join(d, 'package.json'))
  execSync('npm install --registry="http://npm.medissimo.fr:4873" --silent', { cwd: d, stdio: 'inherit' })
  try {
    execSync('npm outdated --registry="http://npm.medissimo.fr:4873"', { cwd: d, stdio: 'inherit' })
    console.log('\tDependencies look up to date')
  } catch (e) {
    console.log('\tYou may have out of date dependencies, check your semver')
  }
  const files = findScripts(d)
  checkDeps(files, Object.keys(pkg.dependencies || {}), false)
  //checkDeps(files, Object.keys(pkg.devDependencies || {}), true)
})