feat(eslint-plugin): export recommended flat config

[AdityyaX]

What changed / motivation ?

This PR adds an exported recommended configuration to @stylexjs/eslint-plugin. This enables users of the new ESLint Flat Config system (ESLint 9+) to set up StyleX rules easily using stylex.configs.recommended.

Previously, users had to manually register the plugin and enable every rule. This change aligns StyleX with standard ESLint plugin patterns like js.configs.recommended or tseslint.configs.recommended.

Linked PR/Issues

Fixes #1632

Additional Context

The recommended configuration automatically handles the plugin registration under the @stylexjs namespace and enables the following core rules:

• @stylexjs/valid-styles: 'error'
• @stylexjs/valid-shorthands: 'error'
• @stylexjs/no-unused: 'error'
• @stylexjs/no-legacy-contextual-styles: 'error'
• @stylexjs/sort-keys: 'warn'

Screenshots, Tests, Anything Else

Changes:

• Modified packages/@stylexjs/eslint-plugin/src/index.js to export a configs object.
• Updated Flow type definitions to support the new exports.

Tests:

• Verified that the plugin correctly exports the configs.recommended object.
• Confirmed the configuration structure is compatible with ESLint Flat Config.

Pre-flight checklist

• I have read the contributing guidelines

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
stylex	Skipped		May 12, 2026 3:07am

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