no-empty-character-class

NOTE: this rule is part of the recommended rule set.

Enable full set in deno.json:

{
  "lint": {
    "rules": {
      "tags": ["recommended"]
    }
  }
}

Enable full set using the Deno CLI:

deno lint --rules-tags=recommended

This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the include or exclude array in deno.json:

{
  "lint": {
    "rules": {
      "include": ["no-empty-character-class"],
      "exclude": ["no-empty-character-class"]
    }
  }
}

Disallows using the empty character class in a regular expression.

Regular expression character classes are a series of characters in brackets, e.g. [abc]. if nothing is supplied in the brackets it will not match anything which is likely a typo or mistake.

Invalid:

/^abc[]/.test("abcdefg"); // false, as `d` does not match an empty character class
"abcdefg".match(/^abc[]/); // null

Valid:

// Without a character class
/^abc/.test("abcdefg"); // true
"abcdefg".match(/^abc/); // ["abc"]

// With a valid character class
/^abc[a-z]/.test("abcdefg"); // true
"abcdefg".match(/^abc[a-z]/); // ["abcd"]

no-empty-character-class

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