diff --git a/.vscode/settings.json b/.vscode/settings.json
index 5a1a1f7..2deff29 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -21,5 +21,8 @@
 		"json",
 		"jsonc",
 		"yaml"
+	],
+	"cSpell.words": [
+		"ESLIT"
 	]
 }
diff --git a/eslint.config.js b/eslint.config.js
index f12c292..f340a50 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,4 +1,4 @@
-import { defineConfig } from '@eslit/core';
+import { defineConfig } from '@eslit/config';
 
 export default defineConfig({
 	environment: {
diff --git a/package.json b/package.json
index 7618bba..ad19204 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   "license": "MIT",
 	"type": "module",
   "dependencies": {
-    "@eslit/core": "workspace:*"
+    "@eslit/config": "workspace:*"
   },
   "devDependencies": {
     "@changesets/cli": "^2.26.2",
diff --git a/packages/core/.lintstagedrc b/packages/config/.lintstagedrc
similarity index 100%
rename from packages/core/.lintstagedrc
rename to packages/config/.lintstagedrc
diff --git a/packages/config/index.d.ts b/packages/config/index.d.ts
new file mode 100644
index 0000000..ce854f6
--- /dev/null
+++ b/packages/config/index.d.ts
@@ -0,0 +1,4 @@
+import type { EnvOptions } from './src/types';
+import type { Linter } from 'eslint';
+
+export async function defineConfig(eslintConfig: Linter.FlatConfig[], environment: EnvOptions): Promise<Linter.FlatConfig[]>;
diff --git a/packages/core/jsconfig.json b/packages/config/jsconfig.json
similarity index 100%
rename from packages/core/jsconfig.json
rename to packages/config/jsconfig.json
diff --git a/packages/core/package.json b/packages/config/package.json
similarity index 97%
rename from packages/core/package.json
rename to packages/config/package.json
index 4692434..d4f4aa2 100644
--- a/packages/core/package.json
+++ b/packages/config/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "@eslit/core",
+  "name": "@eslit/config",
   "version": "0.1.0",
   "description": "",
   "main": "index.js",
diff --git a/packages/core/src/@types/eslint-plugin-jsdoc.d.ts b/packages/config/src/@types/eslint-plugin-jsdoc.d.ts
similarity index 100%
rename from packages/core/src/@types/eslint-plugin-jsdoc.d.ts
rename to packages/config/src/@types/eslint-plugin-jsdoc.d.ts
diff --git a/packages/core/src/@types/globals.d.ts b/packages/config/src/@types/globals.d.ts
similarity index 100%
rename from packages/core/src/@types/globals.d.ts
rename to packages/config/src/@types/globals.d.ts
diff --git a/packages/core/src/@types/typescript-eslint.d.ts b/packages/config/src/@types/typescript-eslint.d.ts
similarity index 100%
rename from packages/core/src/@types/typescript-eslint.d.ts
rename to packages/config/src/@types/typescript-eslint.d.ts
diff --git a/packages/core/src/configs/common.js b/packages/config/src/configs/common.js
similarity index 100%
rename from packages/core/src/configs/common.js
rename to packages/config/src/configs/common.js
diff --git a/packages/core/src/configs/environments.js b/packages/config/src/configs/environments.js
similarity index 100%
rename from packages/core/src/configs/environments.js
rename to packages/config/src/configs/environments.js
diff --git a/packages/core/src/configs/formatting.js b/packages/config/src/configs/formatting.js
similarity index 100%
rename from packages/core/src/configs/formatting.js
rename to packages/config/src/configs/formatting.js
diff --git a/packages/core/src/configs/index.js b/packages/config/src/configs/index.js
similarity index 100%
rename from packages/core/src/configs/index.js
rename to packages/config/src/configs/index.js
diff --git a/packages/core/src/configs/jsdoc.js b/packages/config/src/configs/jsdoc.js
similarity index 100%
rename from packages/core/src/configs/jsdoc.js
rename to packages/config/src/configs/jsdoc.js
diff --git a/packages/core/src/configs/typescript.js b/packages/config/src/configs/typescript.js
similarity index 100%
rename from packages/core/src/configs/typescript.js
rename to packages/config/src/configs/typescript.js
diff --git a/packages/core/src/env.d.ts b/packages/config/src/env.d.ts
similarity index 100%
rename from packages/core/src/env.d.ts
rename to packages/config/src/env.d.ts
diff --git a/packages/core/src/eslintrc-compact.js b/packages/config/src/eslintrc-compact.js
similarity index 100%
rename from packages/core/src/eslintrc-compact.js
rename to packages/config/src/eslintrc-compact.js
diff --git a/packages/core/src/index.js b/packages/config/src/index.js
similarity index 95%
rename from packages/core/src/index.js
rename to packages/config/src/index.js
index 410cfe4..f2f1cf3 100644
--- a/packages/core/src/index.js
+++ b/packages/config/src/index.js
@@ -7,9 +7,9 @@ import * as configs from './configs/index.js';
 import { getTsConfigs } from './tsconfigs.js';
 
 /**
- * @param {import('./types').Config} userConfig
+ * @param {import('./types.js').Config} userConfig
  * User configuration
- * @returns {Promise<import('./types').ESConfig[]>}
+ * @returns {Promise<import('./types.js').ESConfig[]>}
  * The complete list of configs for ESLint
  */
 export async function defineConfig(userConfig) {
diff --git a/packages/core/src/tsconfigs.js b/packages/config/src/tsconfigs.js
similarity index 100%
rename from packages/core/src/tsconfigs.js
rename to packages/config/src/tsconfigs.js
diff --git a/packages/core/src/types.d.ts b/packages/config/src/types.d.ts
similarity index 74%
rename from packages/core/src/types.d.ts
rename to packages/config/src/types.d.ts
index bbc5fdd..b3a5b5d 100644
--- a/packages/core/src/types.d.ts
+++ b/packages/config/src/types.d.ts
@@ -3,6 +3,44 @@ import type { Linter } from 'eslint';
 
 export type ESConfig = Readonly<Linter.FlatConfig>;
 
+export interface EnvOptions {
+	ESLIT_TSCONFIG?: string | string[] | true
+	ESLIT_ROOT?: string
+	ESLIT_INDENT?: 'tab' | 'space' | number
+	ESLIT_ECMASCRIPT?: Linter.ParserOptions['ecmaVersion']
+	ESLIT_SEMI?: 'never' | 'always'
+	/**
+	 * Typescript's type-checking is able to infer types from parameters.
+	 * So using an explicit `:` type annotation isn't obligatory.
+	 *
+	 * But, **by default in strict mode**, type annotations are always mandated to make
+	 * the code more readable, explicit and robust to changes.
+	 *
+	 * See {@link https://typescript-eslint.io/rules/no-inferrable-types typescript-eslint documentation }
+	 * for more info.
+	 * ---
+	 * **Option: `never`** (default)
+	 * Types are always explicit in Typescript
+	 *
+	 * @example ```ts
+			// Typescript
+			const id: number = 10;
+			const name: string = 'foo';
+			```
+	 * ---
+	 * **Option: `always`**
+	 * Types are always inferred in Typescript
+	 *
+	 * @example ```ts
+			// Typescript
+			const id = 10;
+			const name = 'foo';
+			```
+	 */
+	ESLIT_INFER_TYPES?: inferrableTypesOptions
+	[ENV: string]: unknown
+}
+
 export interface Config {
 	tsconfig?: string | string[] | true
 	strict?: boolean
diff --git a/packages/core/index.d.ts b/packages/core/index.d.ts
deleted file mode 100644
index 3f8c3ac..0000000
--- a/packages/core/index.d.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import type { Config, ESConfig } from './src/types';
-
-export async function defineConfig(config: Config): Promise<ESConfig[]>;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c39e1de..3faab23 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,9 +8,9 @@ importers:
 
   .:
     dependencies:
-      '@eslit/core':
+      '@eslit/config':
         specifier: workspace:*
-        version: link:packages/core
+        version: link:packages/config
     devDependencies:
       '@changesets/cli':
         specifier: ^2.26.2
@@ -76,7 +76,7 @@ importers:
         specifier: ^4.4.2
         version: 4.4.2
 
-  packages/core:
+  packages/config:
     dependencies:
       '@eslint/eslintrc':
         specifier: ^2.1.0