npm install --save @types/eslint-visitor-keys
This package contains type definitions for eslint-visitor-keys (https://github.com/eslint/eslint-visitor-keys#readme).
Files were exported from https://www.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/eslint-visitor-keys
Additional Details
These definitions were written by Toru Nagashima https://github.com/mysticatea.