PR Checklist

• Addresses an existing open issue:fixesRepo: Automate version ranges in website's Versioning.md #6389
• That issue was marked asaccepting prs
• Steps inContributing were taken

Overview

The goal of this PR is to refactor all possible places where the TypeScript version/version range is hardcoded and might be taken from the rootpackage.json.

I found the following places (but there may be a few more here):

• Typescript version range indocs/users/Dependency_Versions.mdx

  typescript-eslint/docs/users/Dependency_Versions.mdx

  Line 19 ind89b847

  >The version range of TypeScript currently supported is`>=3.3.1 <5.2.0`.

  It looks exactly the same as before, but now it has become dynamic

• Available TypeScript versions in the playground (thanks toRepo: Automate version ranges in website's Versioning.md #6389 (comment))

  Now it contains only versions that satisfy version range from rootpackage.json
  

• Typescript version range indocs/users/Versioning.mdx

  Will be Removed indocs: remove duplicated package versions description #7343

  typescript-eslint/docs/users/Versioning.mdx

  Line 51 ind89b847

  >The version range of TypeScript currently supported is`>=4.3.5 <5.2.0`.

• [Postponed]Probably this range also should be taken from the rootpackage.json (Maybe I'm wrong)
  

  typescript-eslint/packages/typescript-estree/src/parseSettings/warnAboutTSVersion.ts

  Lines 5 to 9 ind89b847

  	/**
  	* This needs to be kept in sync with /docs/users/Versioning.mdx
  	* in the typescript-eslint monorepo
  	*/
  	constSUPPORTED_TYPESCRIPT_VERSIONS='>=4.3.5 <5.2.0';

  But the only thing that prevents this from being done is"rootDir": "." in thetsconfig.json
  

  typescript-eslint/packages/typescript-estree/tsconfig.json

  Line 5 ind89b847

  "rootDir":"."

  typescript-eslint/packages/typescript-estree/tsconfig.build.json

  Line 6 ind89b847

  "rootDir":"./src",

  
  So we can't just importpackage.json from the repository root. Is there any other way do get this done? Or this constant and range inpackage.json must be independent?

• [Postponed]Also not sure what to do with this list

  Should it also be updated automatically?

  typescript-eslint/packages/typescript-estree/src/version-check.ts

  Lines 14 to 23 ind89b847

  	constversions=[
  	'4.3',
  	'4.4',
  	'4.5',
  	'4.6',
  	'4.7',
  	'4.8',
  	'4.9',
  	'5.0',
  	]asconst;