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=4.6.4&sourceType=module&code=PQgEB4CcFMDNpgOwMbVAGwJYCMC8AiaAZwCYAGARgFZ9RgA+AKGcegA8AHAe0gBdRkXREX6IArgFsA+ry5SRkTIgDmoXKAAUiAFyhxE7AgCUa+noB0sgMq9FKjUebtufAUJGgAJgENe0GXISRGqanroAIr7QJrhmnuYAbt7oYtAA8rAOjEA&rules=N4IgAgLgngDgpgZwMYCcCWMIFpEBs0B2EA9DCnAGZwpbkCGAJgPYG5RYx0p0C2cE1LNHgIQALhDUUTFCAC+QA&tsConfig=N4XyA

Repro Code

/// <reference lib="es2015" />



export const num_to_string = (n: number) => n.toString()

export const date_to_ms = (d: Date) => d.valueOf()

ESLint Config

module.exports = {
  "parser": "@typescript-eslint/parser",
  "rules": {
    "@typescript-eslint/prefer-readonly-parameter-types": "error"
  }
}

tsconfig

{
  "compilerOptions": {}
}

Expected Result

No complain with builtin Date type.

Actual Result

Parameter should be a read only type.

Additional Info

No response

Versions