feat: add oxlint migration scripts

Author: pi0

actions/unjs/oxlint.ts

@@ -0,0 +1,83 @@
+import { defineAction } from "codeup";
+
+// https://eslint.org/docs/latest/use/configure/configuration-files
+const ESLINT_CONFIG_FILES = [
+  "eslint.config.js",
+  "eslint.config.mjs",
+  "eslint.config.cjs",
+  "eslint.config.ts",
+  "eslint.config.mts",
+  "eslint.config.cts",
+  ".eslintrc",
+  ".eslintrc.js",
+  ".eslintrc.cjs",
+  ".eslintrc.yaml",
+  ".eslintrc.yml",
+  ".eslintrc.json",
+  ".eslintignore",
+];
+
+export default defineAction({
+  meta: {
+    name: "oxlint",
+    description: "Switch from ESLint to oxlint",
+    date: "2026-01-29",
+  },
+  async filter({ utils }) {
+    // Only apply if an eslint config exists
+    return (
+      (await utils.existsWithAnyExt("eslint.config")) ||
+      (await utils.existsWithAnyExt(".eslintrc"))
+    );
+  },
+  async apply({ utils }) {
+    // Remove eslint from devDependencies
+    const packageJson = await utils.readPackageJSON();
+    if (packageJson?.devDependencies?.eslint) {
+      await utils.removeDependency("eslint");
+    }
+
+    // Remove all eslint config files
+    for (const file of ESLINT_CONFIG_FILES) {
+      await utils.remove(file);
+    }
+
+    // Create oxlint.json config
+    await utils.write(
+      "oxlint.json",
+      JSON.stringify(
+        {
+          $schema: "https://unpkg.com/oxlint/configuration_schema.json",
+          plugins: ["unicorn", "typescript", "oxc"],
+        },
+        null,
+        2,
+      ),
+      { skipIfExists: true },
+    );
+
+    // Install oxlint as dev dependency
+    await utils.addDevDependency("oxlint");
+
+    // Update package.json scripts to use oxlint instead of eslint
+    await utils.updatePackageJSON((pkg) => {
+      if (!pkg.scripts) {
+        return;
+      }
+      for (const name of ["lint", "lint:fix", "format"]) {
+        if (pkg.scripts[name]) {
+          // Replace eslint --fix with oxlint --fix
+          pkg.scripts[name] = pkg.scripts[name].replace(
+            /eslint\s+--fix\b/g,
+            "oxlint --fix",
+          );
+          // Replace eslint with oxlint (for non --fix cases)
+          pkg.scripts[name] = pkg.scripts[name].replace(
+            /eslint(?!\s+--fix)\b/g,
+            "oxlint",
+          );
+        }
+      }
+    });
+  },
+});