16.0.0

Migrating to 16.0.0 guide.

• Removed: Node.js less than 18.12.0 support (#7020) (@ybiquitous).
• Removed: 76 rules deprecated in 15.0.0 (#6979) (@mattxwang).
• Changed: stylelint.formatters object to have Promise values (#7184) (@ybiquitous).
• Changed: exit code for CLI flag error (#7134) (@ybiquitous).
• Changed: default syntax behaviour to always use safe-parser with fix regardless of extension (#7357) (@ybiquitous).
• Changed: TypeScript definitions for ESM (#7309) (@ybiquitous).
• Changed: stylelint.rules object to have Promise values (#7279) (@ybiquitous).
• Changed: stylelint.utils.checkAgainstRule to be an async function (#7339) (@ybiquitous).
• Deprecated: CommonJS Node.js API (#7353) (@ybiquitous).
• Deprecated: output property in a Node.js API returned object. Instead, report/code properties are recommended (#7183) (@ybiquitous) & (@haocheng6).
• Added: exports field to package.json for Conditional Exports (ESM/CommonJS) (#7307) (@ybiquitous).
• Added: support for ESM plugins (#7339) (@ybiquitous).
• Added: support for ESM custom formatters (#7343) (@ybiquitous).
• Added: severity secondary option's function support (#7202) (@kizu).
• Added: support for a Promise formatter function (#7184) (@ybiquitous).
• Added: support for ESM custom syntaxes (#7351) (@ybiquitous).
• Added: report/code properties to a Node.js API returned object (#7183) (@ybiquitous) & (@haocheng6).
• Fixed: no longer needed workaround for Cosmiconfig segfault (#7329) (@ybiquitous).
• Fixed: CLI regression to avoid waiting for stdin without any input (#7131) (@ybiquitous).
• Fixed: CLI to avoid different outputs on empty files and empty stdin (#7131) (@ybiquitous).
• Refactored: .js extension to .mjs and .cjs (#7307) (@ybiquitous).