import-dedupe.ts

import { createEslintRule } from "../utils";

export const RULE_NAME = "import-dedupe";
export type MessageIds = "importDedupe";
export type Options = [];

export default createEslintRule<Options, MessageIds>({
  name: RULE_NAME,
  meta: {
    type: "problem",
    docs: {
      description: "Fix duplication in imports",
      recommended: "strict"
    },
    fixable: "code",
    schema: [],
    messages: {
      importDedupe: "Expect no duplication in imports"
    }
  },
  defaultOptions: [],
  create: (context) => {
    return {
      ImportDeclaration(node) {
        if (node.specifiers.length <= 1) {
          return;
        }

        const names = new Set<string>();
        node.specifiers.forEach((n) => {
          const id = n.local.name;
          if (names.has(id)) {
            context.report({
              node,
              loc: {
                start: n.loc.end,
                end: n.loc.start
              },
              messageId: "importDedupe",
              fix(fixer) {
                const s = n.range[0];
                let e = n.range[1];
                if (context.getSourceCode().text[e] === ",") {
                  e += 1;
                }
                return fixer.removeRange([s, e]);
              }
            });
          }
          names.add(id);
        });

        // console.log(node)
      }
    };
  }
});