drop pre-TS-4.1 types and workarounds

[phryneas]

No description provided.

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[markerikson]

Size check fails with:

 npm ERR! While resolving: rtk-monorepo@undefined
npm ERR! Found: eslint@7.32.0
npm ERR! node_modules/eslint
npm ERR!   dev eslint@"^7.25.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer eslint@"^5.0.0 || ^6.0.0" from @typescript-eslint/parser@2.34.0
npm ERR! node_modules/@typescript-eslint/parser
npm ERR!   peer @typescript-eslint/parser@"2.x" from eslint-config-react-app@5.2.1
npm ERR!   node_modules/eslint-config-react-app
npm ERR!     dev eslint-config-react-app@"^5.0.1" from the root project
npm ERR!   peer @typescript-eslint/parser@"^2.0.0" from @typescript-eslint/eslint-plugin@2.34.0
npm ERR!   node_modules/@typescript-eslint/eslint-plugin
npm ERR!     peer @typescript-eslint/eslint-plugin@"2.x" from eslint-config-react-app@5.2.1
npm ERR!     node_modules/eslint-config-react-app
npm ERR!       dev eslint-config-react-app@"^5.0.1" from the root project

Actual code changes seem reasonable, though.

[phryneas]

That's because it uses npm. I've filed an issue over there and will merge this.
andresz1/size-limit-action#77

[phryneas]

We'll have to cherry-pick this over into the 1.9 integration branch and then merge #2276