codemod that upgrade lodash v3 import to v4

lodash-v3-import-to-v4.js

// this codemod will replace all 'lodash/<whatever>/<func>' -> 'lodash/<func>'
// usage: jscodeshift -t tools/lodash-3-4.js src

let transformModuleName = (name) => {
  let matchObj = name.match(/^lodash\/(.*)\/(.*)/)
  if(matchObj) {
    return ['lodash', matchObj[2]].join('/')
  }
  return name
}

export default function transformer(file, api) {
  const j = api.jscodeshift
  const {expression, statement, statements} = j.template

  return j(file.source)
  .find(j.ImportDeclaration)
  .replaceWith((p) => {
    // "lodash/${a}/${b}" -> "lodash/${b}"
    var tree = p.value
    , pkgName = transformModuleName(tree.source.value)
    , specifiers = tree.specifiers;

    return Object.assign(tree, {
      source: j.literal(pkgName)
    })
  })
  .toSource({
    tabWidth: 2
    , lineTerminator: '\r\n'
    , trailingComma: false
  })
};

Preview and test the codemod here