frontmatter

Use configs.frontmatter when you want ESLint to extract leading YAML frontmatter from Markdown-family files.

import jsonSchemaValidator from "eslint-plugin-json-schema-validator-2";

export default [
 ...jsonSchemaValidator.configs.frontmatter,
 {
  rules: {
   "json-schema-validator-2/no-invalid": [
    "error",
    {
     schemas: [
      {
       fileMatch: ["**/*.frontmatter.yaml"],
       schema: "./schemas/frontmatter.schema.json",
      },
     ],
     useSchemastoreCatalog: false,
    },
   ],
  },
 },
];

This config expands configs.base, then attaches the json-schema-validator-2/frontmatter processor to:

• *.md
• *.mdx
• *.mdc

The processor exposes the leading frontmatter block as a virtual *.frontmatter.yaml file. The config does not enable json-schema-validator-2/no-invalid by itself, because frontmatter schemas are project-specific. Add a rule override with the schema that matches your docs metadata.

The legacy configs["flat/frontmatter"] export points to the same config array.