Runtime.HandlerNotFound index.handler is undefined or not exported

Last updated on Feb 17, 2024 1 min read

最近係公司度做返D house keeping 野…
其中我地有一個service 係用Lambda 寫的…

我地會 upload 一個Zip file 去 S3 度比 Lambda 去 deploy

Deploy 完之後出現左以下的 Error Message
Warning: Accessing non-existent property 'handler' of module exports inside circular dependency

ERROR	Uncaught Exception 	
{
    "errorType": "Runtime.HandlerNotFound",
    "errorMessage": "index.handler is undefined or not exported",
    "stack": [
        "Runtime.HandlerNotFound: index.handler is undefined or not exported",
        "    at Object.module.exports.load (/var/runtime/UserFunction.js:304:11)",
        "    at Object.<anonymous> (/var/runtime/index.js:43:34)",
        "    at Module._compile (internal/modules/cjs/loader.js:1114:14)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1143:10)",
        "    at Module.load (internal/modules/cjs/loader.js:979:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:819:12)",
        "    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)",
        "    at internal/main/run_main_module.js:17:47"
    ]
}

原來問題是 zip 個 package 有多一個folder 所以認不到 index.js

解決方法 我們需要確保Upload 的那個zip file 的 root layer 是有 index.js 和入面有相關的功能便可…

Hope you find it useful

Runtime.HandlerNotFound index.handler is undefined or not exported

Chi Yau

Software Engineer