how ignore typescript errors with @ts-ignore?

I have a case where I'm importing a puraly JavaScript library within TypeScript project giving me the nagging Could not find a declaration file for module xxx message. So after reading I found I can supress that with a comment with @ts-ignore. Yet adding that comment before the offending line, I get another error

Do not use "// @ts-ignore" comments because they suppress compilation errors @typescript-eslint/ban-ts-ignore

How can I fix this error and suppress the original message?

You can stop using @ts-ignore

Or you can disable the eslint rule. Add that in your eslint config (.eslintrc or equivalent)

...
  "rules": {
    "@typescript-eslint/ban-ts-ignore": "off"
  }
...

EDIT: If you are using @typescript-eslint/eslint-plugin version 2.18 or higher, the rule is called ban-ts-comment and you need to add

"@typescript-eslint/ban-ts-comment": "off"

instead. Here is the changelog

All answers here suggest disabling the whole eslint rule which is not very practical, a better solution will be to ignore the eslint error at that specific location like this:

// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore

Posting as an answer instead of comment to the accepted answer because of my lack of reputation. I still want to contribute and possibly help someone out.

The rule for me was

@typescript-eslint/ban-ts-comment

not ban-ts-ignore