[no-unused-vars] False positive with Decorators and Promises

[msanguineti]

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

# reproduction repo
git clone https://github.com/msanguineti/ts-eslint-test.git
# or
npx degit https://github.com/msanguineti/ts-eslint-test.git#main

.eslintrc.json

{
  "env": {
    "es2021": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 12,
    "sourceType": "module",
    "project": "tsconfig.json"
  },
  "plugins": ["@typescript-eslint"],
  "rules": {}
}

index.ts

interface Message {
  body: string
}

const LogParameter = (): ParameterDecorator => {
  return (): void => {
    // ...
  }
}

export class Messenger {
  async deliverMessage(@LogParameter() message: string): Promise<Message> {
    return Promise.resolve({ body: message })
  }
}

tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "ES2018",
    "strict": true
  },
  "exclude": ["node_modules", "dist"]
}

Expected Result

No linting errors or warnings

Actual Result

  1:11  warning  'Message' is defined but never used  @typescript-eslint/no-unused-vars

Additional Info

This problem did not happen with @typescript-eslint/parser version 4.13.0. It only appeared in the last few days when I've upgraded the package to the latest version

Versions

package	version
@typescript-eslint/parser	4.14.0
@typescript-eslint/eslint-plugin	4.14.0
TypeScript	4.1.3
ESLint	7.18.0
node	14.15.4

[bradzacher]

Same as #2941, #2942, #2945, #2947, #2950, #2957

Please use the search next time.