Invalid import URL causes infinite loop for operator-* rules

[mickyginger]

Here is a reproduction of the issue:

const stylelint = require('stylelint');

stylelint
  .lint({
    code: `@import url('(https://example.com');`,
    config: {
      extends: ['stylelint-config-recommended-scss'],
      rules: {
        'scss/operator-no-newline-after': true,
        'scss/operator-no-newline-before': true,
        'scss/operator-no-unspaced': true,
      },
    },
  })
  .then((result) => {
    console.log(result);
  })
  .catch((error) => {
    console.log(error);
  });

The rules specified in config.rules cause the node process to consume >100% CPU resource. My guess is that stylelint is looking for a closing parenthesis for the erroneous one at the start of the URL string, and rather than throwing an error when it can't find it, ends up in an infinite loop.

[kristerkari]

Thanks for reporting @mickyginger! I can have a look and try to reproduce the infinite loop.