Rule Change: improve no-misleading-character-class so that it reports on the sub-node range rather than the entire node

[bradzacher]

What rule do you want to change?

no-misleading-character-class

What change to do you want to make?

Generate more warnings

How do you think the change should be implemented?

A new default behavior

Example code

/[\u{2ea}-\u{2eb}\u{1100}-\u{11ff}\u{2e80}-\u{2e99}\u{2e9b}-\u{2ef3}\u{2f00}-\u{2fd5}\u{3005}\u{3007}\u{3021}-\u{3029}\u{302e}-\u{302f}\u{3038}-\u{303a}\u{303b}\u{3041}-\u{3096}\u{309d}-\u{309e}\u{309f}\u{30a1}-\u{30fa}\u{30fd}-\u{30fe}\u{30ff}\u{3105}-\u{312f}\u{3131}-\u{318e}\u{31a0}-\u{31bf}\u{31f0}-\u{31ff}\u{3200}-\u{321e}\u{3260}-\u{327e}\u{32d0}-\u{32fe}\u{3300}-\u{3357}\u{3400}-\u{4dbf}\u{4e00}-\u{9ffc}\u{a960}-\u{a97c}\u{ac00}-\u{d7a3}\u{d7b0}-\u{d7c6}\u{d7cb}-\u{d7fb}\u{f900}-\u{fa6d}\u{fa70}-\u{fad9}\u{ff66}-\u{ff6f}\u{ff71}-\u{ff9d}\u{ffa0}-\u{ffbe}\u{ffc2}-\u{ffc7}\u{ffca}-\u{ffcf}\u{ffd2}-\u{ffd7}\u{ffda}-\u{ffdc}\u{16ff0}-\u{16ff1}\u{1b000}\u{1b001}-\u{1b11e}\u{1b150}-\u{1b152}\u{1b164}-\u{1b167}\u{1f200}\u{20000}-\u{2a6dd}\u{2a700}-\u{2b734}\u{2b740}-\u{2b81d}\u{2b820}-\u{2cea1}\u{2ceb0}-\u{2ebe0}\u{2f800}-\u{2fa1d}\u{30000}-\u{3134a}]/u;

What does the rule currently do for this code?

The rule currently errors on the entire RegExp literal.
eslint playground example

What will the rule do after it's changed?

The rule will report on the sub-node range that violates the rule instead of the entire literal node. For long regexes it can be pretty-well impossible to understand what the actual problem is if the rule reports on the entire node.

Example with reporting on the relevant violating sub-node ranges:

/[\u{2ea}-\u{2eb}\u{1100}-\u{11ff}\u{2e80}-\u{2e99}\u{2e9b}-\u{2ef3}\u{2f00}-\u{2fd5}\u{3005}\u{3007}\u{3021}-\u{3029}\u{302e}-\u{302f}\u{3038}-\u{303a}\u{303b}\u{3041}-\u{3096}\u{309d}-\u{309e}\u{309f}\u{30a1}-\u{30fa}\u{30fd}-\u{30fe}\u{30ff}\u{3105}-\u{312f}\u{3131}-\u{318e}\u{31a0}-\u{31bf}\u{31f0}-\u{31ff}\u{3200}-\u{321e}\u{3260}-\u{327e}\u{32d0}-\u{32fe}\u{3300}-\u{3357}\u{3400}-\u{4dbf}\u{4e00}-\u{9ffc}\u{a960}-\u{a97c}\u{ac00}-\u{d7a3}\u{d7b0}-\u{d7c6}\u{d7cb}-\u{d7fb}\u{f900}-\u{fa6d}\u{fa70}-\u{fad9}\u{ff66}-\u{ff6f}\u{ff71}-\u{ff9d}\u{ffa0}-\u{ffbe}\u{ffc2}-\u{ffc7}\u{ffca}-\u{ffcf}\u{ffd2}-\u{ffd7}\u{ffda}-\u{ffdc}\u{16ff0}-\u{16ff1}\u{1b000}\u{1b001}-\u{1b11e}\u{1b150}-\u{1b152}\u{1b164}-\u{1b167}\u{1f200}\u{20000}-\u{2a6dd}\u{2a700}-\u{2b734}\u{2b740}-\u{2b81d}\u{2b820}-\u{2cea1}\u{2ceb0}-\u{2ebe0}\u{2f800}-\u{2fa1d}\u{30000}-\u{3134a}]/u;
//                                                                                                            ^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            ^^^^^^^^^^^^^^^^^^

This will result in more lint rule reports because it will report more than once per node.
But I think the increased understandability of the reports is worth it.

Participation

• I am willing to submit a pull request to implement this change.

Additional comments

No response

[mdjermanovic]

Make sense to me because the current reporting from this rule really isn't informative enough. I'll work on this.