Before You File a Bug Report Please Confirm You Have Done The Following...

• 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.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.8.2&fileType=.tsx&code=PQKgBApgzgNglgOwC5gAJIJ4AdoGMBOcWSAtNPMsPhAI4Cuc1JAhgO7NxIBcYARBPnwB7fLzAhgAKEmIkAgGbNcEMADEhQsAG9JYMPIQ8AFAEowAXgB8YAArCAtnCgQAPADchcACaWA3JIBfaXk6BFwkOCEEMHtmAGsIUx51TR09XCioFHkNZI0LbV09fUMwZigMMLBTC2s04vTMoRgIADoYIQBzIwByAAsIGA6wVhEYLx6TfwaAgBoigOmwaiQ6fGicoX8goA&eslintrc=N4KABGBEBOCuA2BTAzpAXGYBfEWg&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

/* eslint @typescript-eslint/require-await: "error" */

interface Foo {
  fn: () => Promise<void>;
}

function make(): Foo {
  const foo: Foo = {
    fn: async () => {
      console.log('hello world');
    },
  };
  return foo;
}

ESLint Config

module.exports = {
  "rules": {}
}

tsconfig

{
  "compilerOptions": {
    "strictNullChecks": true
  }
}

Expected Result

The rule believes that the fn implementation inside the interface must not be async, as it lacks an await expression or a return Promise... However, making it not async causes the code to fail to compile: it must be async according to the types. I believe the purpose of this rule (over the eslint one) is to use this type information to not flag this code as incorrect.

Actual Result

Async method 'fn' has no 'await' expression. 9:5 - 9:15
> Remove 'async'.

Additional Info

No response