hermes-eslint missing __defineGeneric in context getScope

[Brianzchen]

Bug Description

Hello, I maintain eslint-plugin-ft-flow and have this issue. There is a rule that calls __defineGeneric which comes from create function's context.getScope or context.sourceCode.getScope(node). The problem is with flow users being recommended to use hermes-eslint over @babel/eslint-parser this function does not exist in hermes-eslint and is throwing errors that __defineGeneric is not a function.

What do you recommend is the appropriate replacement function here or is it something that's mistakeningly missing from hermes.

Thank you!
cc @pieterv

Steps To Reproduce

1. Clone https://github.com/flow-typed/eslint-plugin-ft-flow/tree/missing-define-generic
2. Checkout to the branch missing-define-generic
3. Run yarn to install dependencies
4. Run yarn test:rules to see the errors
5. Rule in question can be found in src/rules/defineFlowType.js and you can modify it before running yarn test:rules again

code example:

The Expected Behavior

It does not error

[Brianzchen]

Actually scratch that, managed to rewrite our function without the need for __defineGeneric here flow-typed/eslint-plugin-ft-flow#50