什么是ngc模块codegen

我有错误

$ node node_modules/.bin/ngc --project foo module.js:471 throw err; ^ Error: Cannot find module './codegen' at Function.Module._resolveFilename (module.js:469:15) at Function.Module._load (module.js:417:25) at Module.require (module.js:497:17) at require (internal/module.js:20:19) at Object.<anonymous> (/home/paul/lucid/main2/cake/node_modules/.bin/ngc:5:17) at Module._compile (module.js:570:32) at Object.Module._extensions..js (module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad (module.js:446:12) at Function.Module._load (module.js:438:3) 

我试图解密这个错误。 什么是./codegen和节点试图读取它的path？