@graphql-eslint/eslint-plugin/esm/rules/unique-enum-value-names/index.js

GraphQL plugin for ESLint

import { Kind } from "graphql";
import { getNodeName } from "../../utils.js";
const rule = {
  meta: {
    type: "suggestion",
    hasSuggestions: true,
    docs: {
      url: "https://the-guild.dev/graphql/eslint/rules/unique-enum-value-names",
      category: "Schema",
      recommended: true,
      description: `A GraphQL enum type is only valid if all its values are uniquely named.
> This rule disallows case-insensitive enum values duplicates too.`,
      examples: [
        {
          title: "Incorrect",
          code: (
            /* GraphQL */
            `
            enum MyEnum {
              Value
              VALUE
              ValuE
            }
          `
          )
        },
        {
          title: "Correct",
          code: (
            /* GraphQL */
            `
            enum MyEnum {
              Value1
              Value2
              Value3
            }
          `
          )
        }
      ]
    },
    schema: []
  },
  create(context) {
    const selector = [Kind.ENUM_TYPE_DEFINITION, Kind.ENUM_TYPE_EXTENSION].join(",");
    return {
      [selector](node) {
        const duplicates = node.values?.filter(
          (item, index, array) => array.findIndex((v) => v.name.value.toLowerCase() === item.name.value.toLowerCase()) !== index
        );
        for (const duplicate of duplicates || []) {
          const enumName = duplicate.name.value;
          context.report({
            node: duplicate.name,
            message: `Unexpected case-insensitive enum values duplicates for ${getNodeName(
              duplicate
            )}`,
            suggest: [
              {
                desc: `Remove \`${enumName}\` enum value`,
                fix: (fixer) => fixer.remove(duplicate)
              }
            ]
          });
        }
      }
    };
  }
};
export {
  rule
};