@jsxtools/eslint-plugin-jsx-a11y/lib/rule/html-has-lang2.js

Static AST checker for accessibility rules on JSX elements for flat ESLint Config.

import tags from 'language-tags';
import { propName, getLiteralPropValue } from '../util/module/jsx-ast-utils.js';
import { generateObjSchema } from '../util/schemas.js';
import getElementType from '../util/getElementType.js';

const errorMessage = "lang attribute must have a valid value.";
const schema = generateObjSchema();
const ruleOfLang = {
  meta: {
    docs: {
      url: "https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/tree/HEAD/docs/rules/lang.md",
      description: "Enforce lang attribute has a valid value."
    },
    schema: [schema]
  },
  create: (context) => {
    const elementType = getElementType(context);
    return {
      JSXAttribute: (node) => {
        const name = propName(node);
        if (name && name.toUpperCase() !== "LANG") {
          return;
        }
        const { parent } = node;
        const type = elementType(parent);
        if (type && type !== "html") {
          return;
        }
        const value = getLiteralPropValue(node);
        if (value === null) {
          return;
        }
        if (value === void 0) {
          context.report({
            node,
            message: errorMessage
          });
          return;
        }
        if (tags.check(value)) {
          return;
        }
        context.report({
          node,
          message: errorMessage
        });
      }
    };
  }
};

export { ruleOfLang as default };