if-newline.ts

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

export const RULE_NAME = "if-newline";
export type MessageIds = "missingIfNewline";
export type Options = [];

export default createEslintRule<Options, MessageIds>({
  name: RULE_NAME,
  meta: {
    type: "layout",
    docs: {
      description: "Newline after if",
      recommended: "stylistic"
    },
    fixable: "whitespace",
    schema: [],
    messages: {
      missingIfNewline: "Expect newline after if"
    }
  },
  defaultOptions: [],
  create: (context) => {
    return {
      IfStatement(node) {
        if (!node.consequent) {
          return;
        }
        if (node.consequent.type === "BlockStatement") {
          return;
        }
        if (node.test.loc.end.line === node.consequent.loc.start.line) {
          context.report({
            node,
            loc: {
              start: node.test.loc.end,
              end: node.consequent.loc.start
            },
            messageId: "missingIfNewline",
            fix(fixer) {
              return fixer.replaceTextRange([node.consequent.range[0], node.consequent.range[0]], "\n");
            }
          });
        }
      }
    };
  }
});