Description

Implement typescript-eslint/prefer-readonly.

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I suggested the name useReadonlyClassProperties because it is in line with some of our existing names such as noUnusedPrivateClassMembers.

See the related discussion for some context.

Options

I don't think we should implement the ESLint's option onlyInlineLambdas because it is very rarely used.

I propose adding an option checkPublic that extends the check on all properties (public and protected properties).