Migrate typescript-eslint-parser to 21.0.2

[armano2]

To make it work this PR has to be merged due to bug in visitor-tree

• Fix: missing visitor-keys eslint/typescript-eslint-parser#554
• Fix: visitor-keys for TSAbstractClassProperty eslint/typescript-eslint-parser#560
• Fix: visiting superTypeParameters in classes eslint/typescript-eslint-parser#561
• Fix: visiting implements in classes eslint/typescript-eslint-parser#562
• Fix: visiting typeParameters in expressions eslint/typescript-eslint-parser#565
• Fix: scope for TSImportEqualsDeclaration eslint/typescript-eslint-parser#571
• New release of typescript-eslint-parser

unblocks #117, #181 PR

fixes: #152, #155, #126, #164, #166, #171, #193, #189, #143, #33

[weirdpattern]

This looks so much cleaner... thank you @armano2 .
Hoping the new version of the parser gets released soon...

[armano2]

@weirdpattern big part of no-unused-vars its going to be replaced by "ClassImplements Identifier" but only after issues from eslint/typescript-eslint-parser#555 are going to be fixed,

additionally i found some issues in this and old version, any keyword is not always catched, due to visitor and its listed eslint/typescript-eslint-parser#555

class Foo<T extends any = any> extends Foo<any> {}

non of them is going to be reported

[bradzacher]

I should go through and read up on the new nodes.
It looks like they've added a lot of really helpful stuff to make dealing with the AST easier!

[armano2]

@bradzacher @weirdpattern for everyone who wants to try new version i suggest to use npm/@armano/typescript-eslint-parser i published version with my fixes to parser or just clone it from https://github.com/armano2/typescript-eslint-parser till its not ready

i did some cleanup in no-unused-vars :)

[armano2]

do you want me to add test scenario for #143? it's not really related to this code but to fix in visitor.

i tested it locally with new parser and its working correctly.

[bradzacher]

so close...!

[armano2]

@bradzacher there is new version of typescript-eslint-parser available.

[bradzacher]

awesome! I'll give it one final eyeball now

[bradzacher]

it's actually ridiculous how much the combination of new parser nodes + visitorKeys + eslint selectors simplify this entire plugin.

great work all round @armano2.
I owe you a 🍺 for upgrading to selectors and fixing so many parser bugs for us.