问为什么npm为babel运行build抛出一个错误："babel: src不存在“

EN

{
  "name": "notes-app",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "babel src -d lib"
  },
  "author": "Jono Suave",
  "license": "ISC",
  "devDependencies": {
    "@babel/cli": "^7.7.0",
    "@babel/core": "^7.7.2"
  }
}

import getNotes from "notes.js"

getNotes()

let getNotes = function() {
    console.log(`Put the time in baby!`)
}

module.exports = getNotes

babel:
  src does not exist
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! notes-app@1.0.0 build: `babel src -d lib`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the notes-app@1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/jonosuave/.npm/_logs/2019-11-07T01_56_26_260Z-debug.log