object references cause a bug

[mkanako]

I'm submitting a...

[ ] Regression 
[x ] 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

export default registerAs('test', () => ({ var: 1 })); console.log(this.configService.get('test')) // { var:1 } good! console.log(this.configService.get('test.var')) // undefined ??wtf console.log(this.configService.get('test')) // { var: undefined }

the second and third calls return wrong value

Expected behavior

Environment

Nest version: 7.5.3

 
For Tooling issues:
- Node version: 15  
- Platform: Mac 

Others: @nestjs/config:0.6.0

[mkanako]

first call get('test') ConfigService will set the test object reference to internal cache object
second call get('test.var')) ConfigService will call getFromProcessEnv and getFromValidatedEnv then they retrun undefined and set test.var of cache to undefined, note here test in cache is a reference, modify will effect real object

[kamilmysliwiec]

This should be fixed in @nestjs/config@0.6.1