Can't specify object keys that aren't camel case, even when quoted

[Qix-]

It appears I'm going to have to create pragmas to ignore some rules.

With the following object:

const obj = {some_key: 1234}; // 'some_key' is required by the consuming library

XO dies with

Identifier some_key is not in camel case.  camelcase

However, when quoting it (thinking maybe it would ease the error), it errored out with:

Unnecessarily quoted property some_key found.  quote-props

It appears there's no proper way in XO to do this without ignoring some lines (which is ugly).

What XO should do is detect when errors arise in quote-props would cause other errors if unquoted and ignore such cases, though I would imagine this would require some hefty plugin code.

[vadimdemedes]

Very valid point, I ran into this couple of times before.

[sindresorhus]

The problem is that ESLint rules have no knowledge of each other and the ESLint team doesn't seem interested in solving such problem. We could maybe work around it in XO by checking the results and handle conflicts.

[coreyfarrell]

I've run into this issue once on a module that deals with mysql tables, in the past I just disabled camelcase. I just submitted a PR to eslint for camelcase to have an "exceptions" option with a list of identifiers. I feel like this is within the norm for an eslint rule and honestly it will serve my own needs.

As for quote-props, maybe it could be extended to support underscore: true to require quotes around property names that have underscores? The quote-props rule already has similar options numbers and keywords.

[sindresorhus]

I just submitted a PR to eslint for camelcase to have an "exceptions" option with a list of identifiers.

For reference: eslint/eslint#9684

As for quote-props, maybe it could be extended to support underscore: true to require quotes around property names that have underscores? The quote-props rule already has similar options numbers and keywords.

That seems too specific to the underscore style. Maybe it could be an ignore option that accepted a regex for identifiers to ignore?

[j-f1]

camelcase has an option to ignore object keys. i.e.

/* eslint camelcase: ["error", {properties: "never"}] */

// invalid
const foo_bar = 'baz'

// valid:
const bar = {
  foo_bar: fooBar
}

[sindresorhus]

@j-f1 I don't want to ignore all object keys, just the ones with underscore.

[j-f1]

What’s the difference? camelcase only checks if the key has an _ and isn’t UPPER_SNAKE_CASE.

[sindresorhus]

I assumed the camelcase rule would also disallow PascalCase.

[sindresorhus]

I'm not really concerned how it's solved though. I just want a solution to the rule conflict with camelcase and quote-props.

[j-f1]

camelcase doesn’t appear to forbid PascalCase.

I just want a solution to the rule conflict with camelcase and quote-props.

I don’t see one if you set properties: 'never' — the quotes in { 'some_key': 123 } are unnecessary, and { some_key: 123 } is valid. Also, the fact that { 'some_key': 123 } isn’t reported is a bug in the camelcase rule IMO.

[ideastouch]

Issue fixed.
Add to package.json

  "xo": {
    "extends": ".eslintrc"
  },

and in .eslintrc add camelcase's rule

{
    "rules": {
        "camelcase": [
            "error",
            { "properties": "never" }
        ]
    }
}

The file .eslintrc probably could be any other name.
Read ESLint Rules for more properties available to .eslintrc .
I understood what to do reading ESLint Doc Shareable Config -> Sharing Multiple Configs, which was mentioned at npmjs XO -> Config -> extends.

[Qix-]

@ideastouch yes of course, that's an option - overriding the default configuration is always an option. But this issue is addressing two conflicting rules in the default XO configuration that don't make sense.

[pvdlg]

The quote-props already has exception cases for numbers and JS keywords.
Maybe it's reasonable to open an issue/PR to add a regex options that would force to quote / not quote properties that match a regex.
In XO we could configure the quote-props to always quote non camel case props.

[j-f1]

According to the ESLint team, the fact that { 'foo_bar': baz } is allowed by camelcase is a bug.

[pvdlg]

Yep. So not sure that quoting the properties not in camel case, as suggested in the present issue, is the right approach...

The best option might to use eslint-disable comment when you have to use a snake case property because an API requires it

[fregante]

The bugs in the camelcase rule have been fixed and there’s nothing XO can do about allowing some camelcase keys. You can disable the rule globally or inline or, if possible, add some exclusions to the rule’s config.