yml/plain-scalar should ignore 'yes'/'no'/'true'/'false'/etc. by default

[neildaniels]

Ran into an issue where an existing YAML file had 'yes' and 'no' specified.

The yml/plain-scalar rule was a little egregious and changed those to yes and no scalar boolean values. Because these are treated as true/false in YAML, the code consuming these errored about them being the wrong type. https://yaml.org/type/bool.html

Adding them to the ignorePatterns array was sufficient to address this, but this should be handled automatically. Any time one of the reserved words appears in quotes, they should remain in quotes.

Workaround:

{
    "extends": [
        "plugin:yml/standard"
    ],
    "rules": {
        "yml/plain-scalar": ["error", "always", {
            "ignorePatterns": [
                "[\\v\\f\\u0085\\u00a0\\u1680\\u180e\\u2000-\\u200b\\u2028\\u2029\\u202f\\u205f\\u3000\\ufeff]",
                "y|Y|yes|Yes|YES|n|N|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF"
            ]
        }]
    }
}

Example YAML file:

    test:
      - ['y', 'Y', 'yes', 'Yes', 'YES', 'n', 'N', 'no', 'No', 'NO', 'true', 'True', 'TRUE', 'false', 'False', 'FALSE', 'on', 'On', 'ON', 'off', 'Off', 'OFF']

[ota-meshi]

Thank you for posting issue.

It is a YAML 1.1 specification that yes is treated as a bool. Currently this plugin only supports YAML>=1.2. Perhaps the most sensible solution is that this plugin supports YAML 1.1.

[ota-meshi]

I have released a new version of the parser and plugin.
Use the latest version and use the %YAML 1.1 directive, or specify "1.1" in parserOptions.defaultYAMLVersion.

https://github.com/ota-meshi/eslint-plugin-yml#parser-options