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• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
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Issue Description

• Inside TypeOrValueSpecifier => typeDeclaredInDeclarationFile:
• when declaration.path is /.../typescript-eslint/node_modules/@types/node/buffer.d.ts
• program.sourceFileToPackageName.get(declaration.path) returns undefined
• thus, causing the specifier { from: 'package', name: 'Buffer', package: '...anything...' } to not match

It looks like this broke in #6870.

Reproduction Repository Link

https://github.com/abrahamguo/repro/tree/buffer

Repro Steps

1. clone the repo
2. npm i
3. npx eslint index.ts

Versions