[GH-ISSUE #1327] Support rule option names in camelCase #2507

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opened 2026-03-07 20:08:24 +03:00 by kerem · 1 comment

kerem commented

2026-03-07 20:08:24 +03:00

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Originally created by @regseb on GitHub (Aug 13, 2024).
Original GitHub issue: https://github.com/DavidAnson/markdownlint/issues/1327

Description

Option names are in snake_case (e.g. siblings_only for the no-duplicate-heading rule). camelCase names should also be supported (e.g. siblingsOnly).

Motivations

Other linters are in camelCase. Here are some examples:
- ESLint: skipStrings for no-irregular-whitespace`
- Stylelint: ignoreProperties for property-no-unknown
- Markuplint: allowAttrs for invalid-attr
- npm-package-json-lint: requireCapitalFirstLetter for description-format
My markdownlint configuration is a JavaScript file that I check with ESLint and the camelcase rule. ESLint returns errors because the properties are in snake_case.

Originally created by @regseb on GitHub (Aug 13, 2024). Original GitHub issue: https://github.com/DavidAnson/markdownlint/issues/1327 ## Description Option names are in **snake_case** (e.g. `siblings_only` for the [`no-duplicate-heading`](https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md024.md#md024---multiple-headings-with-the-same-content) rule). **camelCase** names should also be supported (e.g. `siblingsOnly`). ## Motivations - Other linters are in camelCase. Here are some examples: - ESLint: `skipStrings` for [`no-irregular-whitespace`](https://eslint.org/docs/latest/rules/no-irregular-whitespace#skipstrings)` - Stylelint: `ignoreProperties` for [`property-no-unknown`](https://stylelint.io/user-guide/rules/property-no-unknown/#ignoreproperties-regex-regex-string) - Markuplint: `allowAttrs` for [`invalid-attr`](https://markuplint.dev/docs/rules/invalid-attr#setting-allow-attrs-option) - npm-package-json-lint: `requireCapitalFirstLetter` for [`description-format`](https://npmpackagejsonlint.org/docs/rules/format/description-format/#example-npmpackagejsonlintrc-configuration-with-only-requirecapitalfirstletter) - [My markdownlint configuration](https://github.com/regseb/gout/blob/v0.12.1/.metalint/markdownlint.config.js#L35-L36) is a JavaScript file that I check with ESLint and the [`camelcase`](https://eslint.org/docs/latest/rules/camelcase) rule. ESLint returns errors because the properties are in snake_case.

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2026-03-07 20:08:24 +03:00

kerem commented

2026-03-07 20:08:25 +03:00

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@DavidAnson commented on GitHub (Aug 13, 2024):

This is a holdover from the original Ruby implementation. It's reasonable to do as you suggest, but I'd rather not code it into every rule or document/test/sample both forms. I'll think about how/when this might be least disruptive.

@DavidAnson commented on GitHub (Aug 13, 2024): This is a holdover from the original Ruby implementation. It's reasonable to do as you suggest, but I'd rather not code it into every rule or document/test/sample both forms. I'll think about how/when this might be least disruptive.