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=MYewdgzgLgBATgQzAExAWwIIQJ5mAMQFc8oBLcGAXhgRzxgAoBKKgPhgG8AoGeAUyiE4YGAAU46UhD4A6OHwggANgDc%2BDKHEJ8mXAL5cuiFOiy4CxYGXDMuQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1oDN4OBDfMwDmtYtA4BbSshTowAbXDYciaBOiQANMpVYV2SP3h8A7gDEO0ANKdTTAMr9uiAMLH4qDEoMGY-JgATKQBBZEImMnNYSKEOJkhdAwBdJIgAXyTUjJB0oA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

const randomAsyncFunction = async () => {
  return Promise.resolve(true)
}

randomAsyncFunction()

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
  rules: {
    "@typescript-eslint/no-floating-promises": [
      "error",
      {
        "allowForKnownSafeCalls": [
          "randomAsyncFunction"
        ]
      }
    ]
  },
};

tsconfig

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

Expected Result

According to the docs, there should be no lint issue with calling this function since it's listed in the allow list.

Actual Result

The lint rules still say it must be dealt with.

Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the void operator. 5:1 - 5:22

Add void operator to ignore.
Add await operator.

Additional Info

I believe this has to do with isKnownSafePromiseReturn, it never calls valueMatchesSomeSpecifier. The incorrect behavior also happens when trying to reference a function from a local file with "from": "file".

Something like this?

function isKnownSafePromiseReturn(node) {
    if (node.type !== utils_1.AST_NODE_TYPES.CallExpression) {
        return false;
    }
    const type = services.getTypeAtLocation(node.callee);
    if ((0, util_1.valueMatchesSomeSpecifier)(node.callee, allowForKnownSafeCalls, services.program, type)) {
        return true;
    }
    return (0, util_1.typeMatchesSomeSpecifier)(type, allowForKnownSafeCalls, services.program);
}