feat: Add ESLint configuration merge function, refactor related files…

…, support TypeScript, update dependencies

generate-eslint-type/index.ts

@@ -0,0 +1,27 @@
+import fs from 'node:fs/promises'
+import { mergeFlatConfigs } from '../src'
+import { builtinRules } from 'eslint/use-at-your-own-risk'
+import { flatConfigsToRulesDTS } from 'eslint-typegen/core'
+
+const configs = await mergeFlatConfigs(
+  {
+    plugins: {
+      '': {
+        rules: Object.fromEntries(builtinRules.entries())
+      }
+    }
+  }
+)
+
+const configNames = configs.map(i => i.name).filter(Boolean) as string[]
+
+let dts = await flatConfigsToRulesDTS (configs, {
+  includeAugmentation: false,
+})
+
+dts += `
+// Names of all the configs
+export type ConfigNames = ${configNames.map(i => `'${i}'`).join(' | ')}
+`
+
+await fs.writeFile('src/eslintype.d.ts', dts)

package.json

@@ -18,7 +18,8 @@
     "build": "tsup",
     "lint": "eslint --flag unstable_ts_config .",
     "lint:fix": "eslint --fix .",
-    "dev": "npx @eslint/config-inspector --config eslint.config.ts"
+    "dev": "npx @eslint/config-inspector --config eslint.config.ts",
+    "generate:eslint:type": "esno generate-eslint-type/index.ts"
   },
   "keywords": [
     "eslint",
@@ -30,11 +31,23 @@
   "devDependencies": {
     "@types/node": "^22.10.5",
     "eslint": "^9.17.0",
+    "eslint-typegen": "^0.3.2",
+    "esno": "^4.8.0",
     "jiti": "^2.4.2",
     "tsup": "^8.3.5",
+    "tsx": "^4.19.2",
     "typescript": "^5.7.3"
   },
   "peerDependencies": {
     "eslint": "^9.17.0"
+  },
+  "dependencies": {
+    "@typescript-eslint/eslint-plugin": "^8.19.1",
+    "@typescript-eslint/parser": "^8.19.1",
+    "eslint-flat-config-utils": "^0.4.0"
+  },
+  "resolutions": {
+    "tsx": "^4.19.2",
+    "eslint": "^9.17.0"
   }
 }