Object literal may only specify known properties, and 'pipes' does not exist in type...

I'm trying to create a custom pipe in Angular 2. When I tried to run it, I got an error message:

Object literal may only specify known properties, and 'pipes' does not exist in type 'Component'
​

Then, I Googled it and found out, I should use declarations: [ mypipe] Instead of pipes: [mypipe], but I got similar error again:

Object literal may only specify known properties, and 'declarations' does not exist in type 'Component'
​

Can anyone explain this, please?

EDIT:

I've just deleted the pipes/declarations line and it worked without any errors.

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