# Proper way to debug "Waiting for missing types to be registered"

**URL:** <https://discourse.nodered.org/t/proper-way-to-debug-waiting-for-missing-types-to-be-registered/52270>\
**Category:** Developing Nodes\
**Tags:** debugging\
**Created:** [15 October 2021 16:48 UTC](https://discourse.nodered.org/t/proper-way-to-debug-waiting-for-missing-types-to-be-registered/52270 "2021-10-15T16:48:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cloud-rocket](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cloud-rocket/32/48745_2.png) [@cloud-rocket](https://discourse.nodered.org/u/cloud-rocket)\
**Post date:** [15 October 2021 16:48 UTC](https://discourse.nodered.org/t/proper-way-to-debug-waiting-for-missing-types-to-be-registered/52270/1 "2021-10-15T16:48:54Z")

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I am pretty new to node-red development and I am trying to bring up the most convenient dev environment.

I am writing a node with a complex server side code that uses external classes. Every time am making a syntax (or another) mistake, my node is not getting registered without any output. At this point, I can go ahead and run the code outside of node-red and see output like this (i.e. via external test code).

```auto
SyntaxError: Unexpected eval or arguments in strict mode
    at wrapSafe (internal/modules/cjs/loader.js:1001:16)
    at Module._compile (internal/modules/cjs/loader.js:1049:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
    at internal/main/run_main_module.js:17:47

```

But I'd like to see the error with a backtrace when executed as a node.

Is there a way to do it?

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<div class="post-metadata">

**Author:** ![BartButenaers](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bartbutenaers/32/10476_2.png) [@BartButenaers](https://discourse.nodered.org/u/BartButenaers)\
**Post date:** [15 October 2021 20:18 UTC](https://discourse.nodered.org/t/proper-way-to-debug-waiting-for-missing-types-to-be-registered/52270/2 "2021-10-15T20:18:39Z")

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Hi @cloud-rocket,  
Can [this](https://discourse.nodered.org/t/how-to-get-errors-exceptions-while-developing-custom-node/23830/3) perhaps be of any help to you?  
Bart

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [14 December 2021 20:19 UTC](https://discourse.nodered.org/t/proper-way-to-debug-waiting-for-missing-types-to-be-registered/52270/3 "2021-12-14T20:19:28Z")

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