Property 'observable' must be of type 'unique symbol', but here has type 'symbol'. in rsjs 7 beta 10

[lajith111]

Aftr upgranding to "@types/node": "^14.14.27",

I am getting elow error

Eror:

node_modules/angular-slickgrid/node_modules/rxjs/internal/symbol/observable.d.ts:4:18 - error TS2717: Subsequent property 
declarations must have the same type.  Property 'observable' must be of type 'unique symbol', but here has type 'symbol'.        

4         readonly observable: symbol;
                   ~~~~~~~~~~

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[ghiscoding]

Your approach is wrong, there's nothing wrong with @types/node, the problem is that you've upgraded to a version of RxJS that is unsupported. Angular-Slickgrid will only work with v6.3.3 of RxJS, which you can see in the package.json here. You might ask why? Because there were a few issues and differences with RxJS version 6.4.0 and up which would break anyone using a version below that and I don't want that, so I fixed it at that version 6.3.3, RxJS 7 is of course completely out of the picture without a major version of my lib and that won't happen until many months, I won't do a major version just to support RxJS 7 (which is still in Beta anyway)... so all that to say, you'll have to stick with a lower version of RxJS or go with something like rxjs-compatible.

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[ghiscoding]

By looking at RxJS repo, I found this is bug caused in latest version 6.6.6 and also in version 7.beta9+ and it looks like the RxJS team will rollback their code change of that symbol Type causing issue. You can see more info in this Angular-CLI issue and also in RxJS issue

Also note that I will support RxJS 7+ in the next major version of Angular-Slickgrid, which is probably couple months away (planning around summer or early summer), the next major version will be quite major, it will use my other lib Slickgrid-Universal monorepo lib and the RxJS 7 part is now covered in this PR which I just merged.