Dynamic ruleName for migration

migration/index.spec.ts

@@ -1,5 +1,4 @@
 import { RuleTester } from "@typescript-eslint/rule-tester";
-import migration from "./index.ts";
 import parser from "@typescript-eslint/parser";
 import manifest from "./package.json" with { type: "json" };
 
@@ -11,10 +10,12 @@ const tester = new RuleTester({
   languageOptions: { parser },
 });
 
-const ruleName = `v${manifest.version.split(".")[0]}`;
-const theRule = migration.rules[ruleName as keyof typeof migration.rules];
+describe("Migration", async () => {
+  vi.stubEnv("TSDOWN_VERSION", manifest.version);
+  const { default: migration } = await import("./index.ts");
+  const ruleName = `v${manifest.version.split(".")[0]}`;
+  const theRule = migration.rules[ruleName as keyof typeof migration.rules];
 
-describe("Migration", () => {
   test("should consist of one rule being the major version of the package", () => {
     expect(migration.rules).toHaveProperty(ruleName);
     expect(migration).toMatchSnapshot();

migration/index.ts

@@ -38,7 +38,10 @@ const listen = <
     {},
   );
 
-const v25 = ESLintUtils.RuleCreator.withoutDocs({
+// eslint-disable-next-line no-restricted-syntax -- substituted by TSDOWN and vitest
+const ruleName = `v${process.env.TSDOWN_VERSION!.split(".")[0]}`;
+
+const theRule = ESLintUtils.RuleCreator.withoutDocs({
   meta: {
     type: "problem",
     fixable: "code",
@@ -90,5 +93,5 @@ const v25 = ESLintUtils.RuleCreator.withoutDocs({
 });
 
 export default {
-  rules: { v25 },
+  rules: { [ruleName]: theRule } as Record<`v${number}`, typeof theRule>,
 } satisfies TSESLint.Linter.Plugin;

migration/tsdown.config.ts

@@ -1,8 +1,12 @@
 import { defineConfig } from "tsdown";
+import manifest from "./package.json" with { type: "json" };
 
 export default defineConfig({
   entry: "index.ts",
   minify: true,
   skipNodeModulesBundle: true,
   attw: { profile: "esmOnly", level: "error" },
+  define: {
+    "process.env.TSDOWN_VERSION": `"${manifest.version}"`, // used by ruleName
+  },
 });