The version of ESLint you are using.
latest

The problem you want to solve.
support class fields officially, as it has reached stage-4.
refs: https://github.com/tc39/proposals/blob/master/finished-proposals.md

Your take on the correct solution to problem.

• Ecma262 update: Normative: Add public and private class fields, static class features, private methods & getters/setters tc39/ecma262#1668
• ESTree update: Add ES2022 estree/estree#250
• Acorn update: Implement ES2022 class features acornjs/acorn#1026
• eslint-visitor-keys update: Update: add PrivateIdentifier and PropertyDefinition eslint-visitor-keys#20
• espree update: Update: add class fields (refs eslint/eslint#14343) js#486
• eslint-scope update: Update: support class fields (refs eslint/eslint#14343) eslint-scope#69
• eslint syntax and rules update: Breaking: upgrade espree and support new class features (refs #14343) #14591
• eslint code path analysis update