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Cryptic Error message when exported Component is not listed in Components collection #479

mcMickJuice opened this issue Mar 6, 2018 · 2 comments


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commented Mar 6, 2018

I'm submitting a...

[ ] Regression 
[ ] Bug report
[ / ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

If I omit an exported component from the components collection of a module but include it in the exports collection, I get a cryptic error when importing it into a component into a separate module.

Nest can't resolve dependencies of the OtherController (?). Please verify whether [0] argument
 is available in the current context.

Expected behavior

The error on boot should say something along the lines of "you have included a Component in the 'exports' collection but did not register it in the 'components' collection. This will cause DI to break. Please list all exported components in the 'components' AND 'exports' collection`

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Better error messaging and less time wasted around incorrect component registration


    "@nestjs/common": "^4.5.9",
    "@nestjs/core": "^4.5.10",
    "@nestjs/microservices": "^4.5.8",
    "@nestjs/testing": "^4.5.5",
    "@nestjs/websockets": "^4.5.8",

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commented Mar 6, 2018

Thanks for reporting @mcMickJuice !


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commented Mar 11, 2018

Added in v4.6.6 🙂

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