Environment

Node version: latest
npm version: latest
Local ESLint version: latest
Global ESLint version: no
Operating System: windows

What parser are you using?

Default (Espree)

What did you do?

/*eslint no-invalid-regexp: ["error", { "allowConstructorFlags": ["a", "a"] }]*/

new RegExp('.', 'a');

What did you expect to happen?

eslint will report duplicate flag passed to allowConstructorFlags.

What actually happened?

eslint doesn't report it

Link to Minimal Reproducible Example

https://eslint.org/play/#eyJ0ZXh0IjoiLyplc2xpbnQgbm8taW52YWxpZC1yZWdleHA6IFtcImVycm9yXCIsIHsgXCJhbGxvd0NvbnN0cnVjdG9yRmxhZ3NcIjogW1wiYVwiLCBcImFcIl0gfV0qL1xuXG5uZXcgUmVnRXhwKCcuJywgJ2EnKTsiLCJvcHRpb25zIjp7InJ1bGVzIjp7fSwibGFuZ3VhZ2VPcHRpb25zIjp7InNvdXJjZVR5cGUiOiJtb2R1bGUiLCJwYXJzZXJPcHRpb25zIjp7ImVjbWFGZWF0dXJlcyI6e319fX19

Participation

• I am willing to submit a pull request for this issue.

Additional comments

No response